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Detection and Correction Using Inertial Aiding By Malek O. Karaim, Tashfeen B. Karamat, Aboelmagd Noureldin, Mohamed Tamazin, and Mohamed M. Atia A team of university researchers has developed a technique combining GPS receivers with an inexpensive inertial measuring unit to detect and repair cycle slips with the potential to operate in real time. INNOVATION INSIGHTS by Richard Langley DRUM ROLL, PLEASE. The “Innovation” column and GPS World are celebrating a birthday. With this issue, we have started the 25th year of publication of the magazine and the column, which appeared in the very first issue and has been a regular feature ever since. Over the years, we have seen many developments in GPS positioning, navigation, and timing with a fair number documented in the pages of this column. In January 1990, GPS and GLONASS receivers were still in their infancy. Or perhaps their toddler years. But significant advances in receiver design had already been made since the introduction around 1980 of the first commercially available GPS receiver, the STI-5010, built by Stanford Telecommunications, Inc. It was a dual-frequency, C/A- and P-code, slow-sequencing receiver. Cycling through four satellites took about five minutes, and the receiver unit alone required about 30 centimeters of rack space. By 1990, a number of manufacturers were offering single or dual frequency receivers for positioning, navigation, and timing applications. Already, the first handheld receiver was on the market, the Magellan NAV 1000. Its single sequencing channel could track four satellites. Receiver development has advanced significantly over the intervening 25 years with high-grade multiple frequency, multiple signal, multiple constellation GNSS receivers available from a number of manufacturers, which can  record or stream measurements at data rates up to 100 Hz. Consumer-grade receivers have proliferated thanks, in part, to miniaturization of receiver chips and modules. With virtually every cell phone now equipped with GPS, there are over a billion GPS users worldwide. And the chips keep getting smaller. Complete receivers on a chip with an area of less than one centimeter squared are common place. Will the “GPS dot” be in our near future? The algorithms and methods used to obtain GPS-based positions have evolved over the years, too. By 1990, we already had double-difference carrier-phase processing for precise positioning. But the technique was typically applied in post-processing of collected data. It is still often done that way today. But now, we also have the real-time kinematic (or RTK) technique to achieve similar positioning accuracies in real time and the non-differenced precise point positioning technique, which does not need base stations and which is also being developed for real-time operation. But in all this time, we have always had a “fly in the ointment” when using carrier-phase observations: cycle slips. These are discontinuities in the time series of carrier-phase measurements due to the receiver temporarily losing lock on the carrier of a GPS signal caused by signal blockage, for example. Unless cycle slips are repaired or otherwise dealt with, reduction in positioning accuracy ensues. Scientists and engineers have developed several ways of handling cycle slips not all of which are capable of working in real time. But now, a team of university researchers has developed a technique combining GPS receivers with an inexpensive inertial measuring unit to detect and repair cycle slips with the potential to operate in real time. They describe their system in this month’s column. “Innovation” is a regular feature that discusses advances in GPS technology and its applications as well as the fundamentals of GPS positioning. The column is coordinated by Richard Langley of the Department of Geodesy and Geomatics Engineering, University of New Brunswick. He welcomes comments and topic ideas. GPS carrier-phase measurements can be used to achieve very precise positioning solutions. Carrier-phase measurements are much more precise than pseudorange measurements, but they are ambiguous by an integer number of cycles. When these ambiguities are resolved, sub-centimeter levels of positioning can be achieved. However, in real-time kinematic applications, GPS signals could be lost temporarily because of various disturbing factors such as blockage by trees, buildings, and bridges and by vehicle dynamics. Such signal loss causes a discontinuity of the integer number of cycles in the measured carrier phase, known as a cycle slip. Consequently, the integer counter is reinitialized, meaning that the integer ambiguities become unknown again. In this event, ambiguities need to be resolved once more to resume the precise positioning and navigation process. This is a computation-intensive and time-consuming task. Typically, it takes at least a few minutes to resolve the ambiguities. The ambiguity resolution is even more challenging in real-time navigation due to receiver dynamics and the time-sensitive nature of the required kinematic solution. Therefore, it would save effort and time if we could detect and estimate the size of these cycle slips and correct the measurements accordingly instead of resorting to a new ambiguity resolution. In this article, we will briefly review the cause of cycle slips and present a procedure for detecting and correcting cycle slips using a tightly coupled GPS/inertial system, which could be used in real time. We will also discuss practical tests of the procedure. Cycle Slips and Their Management A cycle slip causes a jump in carrier-phase measurements when the receiver phase tracking loops experience a temporary loss of lock due to signal blockage or some other disturbing factor. On the other hand, pseudoranges remain unaffected. This is graphically depicted in FIGURE 1. When a cycle slip happens, the Doppler (cycle) counter in the receiver restarts, causing a jump in the instantaneous accumulated phase by an integer number of cycles. Thus, the integer counter is reinitialized, meaning that ambiguities are unknown again, producing a sudden change in the carrier-phase observations. FIGURE 1. A cycle slip affecting phase measurements but not the pseudoranges. Once a cycle slip is detected, it can be handled in two ways. One way is to repair the slip. The other way is to reinitialize the unknown ambiguity parameter in the phase measurements. The former technique requires an exact estimation of the size of the slip but could be done instantaneously. The latter solution is more secure, but it is time-consuming and computationally intensive. In our work, we follow the first approach, providing a real-time cycle-slip detection and correction algorithm based on a GPS/inertial integration scheme. GPS/INS Integration An inertial navigation system (INS) can provide a smoother and more continuous navigation solution at higher data rates than a GPS-only system, since it is autonomous and immune to the kinds of interference that can deteriorate GPS positioning quality. However, INS errors grow with time due to the inherent mathematical double integration in the mechanization process. Thus, both GPS and INS systems exhibit mutually complementary characteristics, and their integration provides a more accurate and robust navigation solution than either stand-alone system. GPS/INS integration is often implemented using a filtering technique. A Kalman filter is typically selected for its estimation optimality and time-recursion properties. The two major approaches of GPS/INS integration are loosely coupled and tightly coupled. The former strategy is simpler and easier to implement because the inertial and GPS navigation solutions are generated independently before being weighted together by the Kalman filter. There are two main drawbacks with this approach: 1) signals from at least four satellites are needed for a navigation solution, which cannot always be guaranteed; and 2) the outputs of the GPS Kalman filter are time correlated, which has a negative impact upon the system performance. The latter strategy performs the INS/GPS integration in a single centralized Kalman filter. This architecture eliminates the problem of correlated measurements, which arises due to the cascaded Kalman filtering in the loosely coupled approach. Moreover, the restriction of visibility of at least four satellites is removed. We specifically use a tightly coupled GPS/reduced inertial sensor system approach. Reduced Inertial Sensor System. Recently, microelectromechanical system or MEMS-grade inertial sensors have been introduced for low-cost navigation applications. However, these inexpensive sensors have complex error characteristics. Therefore, current research is directed towards the utilization of fewer numbers of inertial sensors inside the inertial measurement unit (IMU) to obtain the navigation solution. The advantage of this trend is twofold. The first is avoidance of the effect of inertial sensor errors. The second is reduction of the cost of the IMU in general. One such minimization approach, and the one used in our work, is known as the reduced inertial sensor system (RISS). The RISS configuration uses one gyroscope, two accelerometers, and a vehicle wheel-rotation sensor. The gyroscope is used to observe the changes in the vehicle’s orientation in the horizontal plane. The two accelerometers are used to obtain the pitch and roll angles. The wheel-rotation sensor readings provide the vehicle’s speed in the forward direction. FIGURE 2 shows a general view of the RISS configuration. FIGURE 2. A general view of the RISS configuration. A block diagram of the tightly coupled GPS/RISS used in our work is shown in FIGURE 3. At this stage, the system uses GPS pseudoranges together with the RISS observables to compute an integrated navigation solution. In this three-dimensional (3D) version of RISS, the system has a total of nine states. These states are the latitude, longitude, and altitude errors ( ; the east, north, and up velocity errors   ; the azimuth error  ; the error associated with odometer-driven acceleration  ; and the gyroscope error  . The nine-state error vector xk at time tk is expressed as:     (1) FIGURE 3. Tightly coupled integration of GPS/RISS using differential pseudorange measurements. Cycle Slip Detection and Correction Cycle slip handling usually happens in two discrete steps: detection and fixing or correction. In the first step, using some testing quantity, the location (or time) of the slip is found. During the second step, the size of the slip is determined, which is needed along with its location to fix the cycle slip. Various techniques have been introduced by researchers to address the problem of cycle-slip detection and correction. Different measurements and their combinations are used including carrier phase minus code (using L1 or L2 measurements), carrier phase on L1 minus carrier phase on L2, Doppler (on L1 or L2), and time-differenced phases (using L1 or L2). In GPS/INS integration systems, the INS is used to predict the required variable to test for a cycle slip, which is usually the true receiver-to-satellite range in double-difference (DD) mode, differencing measurements between a reference receiver and the roving receiver and between satellites. In this article, we introduce a tightly coupled GPS/RISS approach for cycle-slip detection and correction, principally for land vehicle navigation using a relative-positioning technique. Principle of the Algorithm. The proposed algorithm compares DD L1 carrier-phase measurements with estimated values derived from the output of the GPS/RISS system. In the case of a cycle slip, the measurements are corrected with the calculated difference. A general overview of the system is given in FIGURE 4. FIGURE 4. The general flow diagram of the proposed algorithm. The number of slipped cycles  is given by    (2) where is the DD carrier-phase measurement (in cycles) is DD estimated carrier phase value (in cycles). is compared to a pre-defined threshold μ . If the threshold is exceeded, it indicates that there is a cycle slip in the DD carrier-phase measurements. Theoretically,   would be an integer but because of the errors in the measured carrier phase as well as errors in the estimations coming from the INS system,  will be a real or floating-point number. The estimated carrier-phase term in Equation (2) is obtained as follows:     (3) where λ is the wavelength of the signal carrier (in meters) are the estimated ranges from the rover to satellites i and j respectively (in meters) are known ranges from the base to satellites i and j respectively (in meters). What we need to get from the integrated GPS/RISS system is the estimated range vector from the receiver to each available satellite ( ). Knowing our best position estimate, we can calculate ranges from the receiver to all available satellites through: (4) where is the calculated range from the receiver to the mth satellite xKF is the receiver position obtained from GPS/RISS Kalman filter solution xm is the position of the mth satellite M is the number of available satellites. Then, the estimated DD carrier-phase term in Equation (3) can be calculated and the following test quantity in Equation (2) can be applied:    (5) If a cycle slip occurred in the ith DD carrier-phase set, the corresponding set is instantly corrected for that slip by:    (6) where s is the DD carrier-phase-set number in which the cycle slip has occurred. Experimental Work The performance of the proposed algorithm was examined on the data collected from several real land-vehicle trajectories. A high-end tactical grade IMU was integrated with a survey-grade GPS receiver to provide the reference solution. This IMU uses three ring-laser gyroscopes and three accelerometers mounted orthogonally to measure angular rate and linear acceleration. The GPS receiver and the IMU were integrated in a commercial package. For the GPS/RISS solution, the same GPS receiver and a MEMS-grade IMU were used. This IMU is a six-degree of freedom inertial system, but data from only the vertical gyroscope, the forward accelerometer, and the transversal accelerometer was used. TABLE 1 gives the main characteristics of both IMUs. The odometer data was collected using a commercial data logger through an On-Board Diagnostics version II (OBD-II) interface. Another GPS receiver of the same type was used for the base station measurements. The GPS data was logged at 1 Hz. Table 1. Characteristics of the MEMS and tactical grade IMUs. Several road trajectories were driven using the above-described configuration. We have selected one of the trajectories, which covers several real-life scenarios encountered in a typical road journey, to show the performance of the proposed algorithm. The test was carried out in the city of Kingston, Ontario, Canada. The starting and end point of the trajectory was near a well-surveyed point at Fort Henry National Historic Site where the base station receiver was located. The length of the trajectory was about 30 minutes, and the total distance traveled was about 33 kilometers with a maximum baseline length of about 15 kilometers. The trajectory incorporated a portion of Highway 401 with a maximum speed limit of 100 kilometers per hour and suburban areas with a maximum speed limit of 80 kilometers per hour. It also included different scenarios including sharp turns, high speeds, and slopes. FIGURE 5 shows measured carrier phases at the rover for the different satellites. Some satellites show very poor presence whereas some others are consistently available. Satellites elevation angles can be seen in FIGURE 6. FIGURE 5. Measured carrier phase at the rover. FIGURE 6. Satellite elevation angles. Results We start by showing some results of carrier-phase estimation errors. Processing is done on what is considered to be a cycle-slip-free portion of the data set for some persistent satellites (usually with moderate to high elevation angles). Then we show results for the cycle-slip-detection process by artificially introducing cycle slips in different scenarios. In the ensuing discussion (including tables and figures), we show results indicating satellite numbers without any mention of reference satellites, which should be implicit as we are dealing with DD data. FIGURE 7 shows DD carrier-phase estimation errors whereas FIGURE 8 shows DD measured carrier phases versus DD estimated carrier phases for sample satellite PRN 22. FIGURE 7. DD-carrier-phase estimation error, reference satellite with PRN 22. FIGURE 8. Measured versus estimated DD carrier phase, reference satellite with PRN 22. As can be seen in TABLE 2, the root-mean-square (RMS) error varies from 0.93 to 3.58 cycles with standard deviations from 0.85 to 2.47 cycles. Estimated phases are approximately identical to the measured ones. Nevertheless, most of the DD carrier-phase estimates have bias and general drift trends, which need some elaboration. In fact, the bias error can be the result of more than one cause. The low-cost inertial sensors always have bias in their characteristics, which plays a major role in this. The drift is further affecting relatively lower elevation  angle satellites which can also be attributed to more than one reason. Indeed, one reason for choosing this specific trajectory, which was conducted in 2011, was to test the algorithm with severe ionospheric conditions as the year 2011 was close to a solar maximum: a period of peak solar activity in the approximately 11-year sunspot cycle. Table 2. Estimation error for DD carrier phases (in cycles). Moreover, the time of the test was in the afternoon, which has the maximum ionospheric effects during the day. Thus, most part of the drift trend must be coming from ionospheric effects as the rover is moving away from the base receiver during this portion of the trajectory. Furthermore, satellite geometry could contribute to this error component. Most of the sudden jumps coincide with, or follow, sharp vehicle turns and rapid tilts. Table 2 shows the averaged RMS and standard deviation (std) DD carrier-phase estimation error for the sample satellite-pairs. We introduced cycle slips at different rates or intensities and different sizes to simulate real-life scenarios. Fortunately, cycle slips are usually big as mentioned earlier and this was corroborated by our observations from real trajectory data. Therefore, it is more important to detect and correct for bigger slips in general. Introducing and Detecting Cycle Slips. To test the robustness of the algorithm, we started with an adequate cycle slip size. Cycle slips of size 10–1000 cycles were introduced with different intensities. These intensities are categorized as few (1 slip per 100 epochs), moderate (10 slips per 100 epochs), and severe (100 slips per 100 epochs). This was applied for all DD carrier-phase measurement sets simultaneously. The threshold was set to 1.9267 (average of RMS error for all satellite-pairs) cycles. Four metrics were used to describe the results. Mean square error (MSE); accuracy, the detected cycle slip size with respect to the introduced size; True detection (TD) ratio; and Mis-detection (MD) ratio. Due to space constraints and the similarity between results for different satellites, we only show results for the reference satellite with PRN 22. FIGURES 9–12 show introduced versus calculated cycle slips along with the corresponding detection error for sample satellites in the different scenarios. TABLES 3–5 summarize these results. FIGURE 9. Introduced and calculated cycle slips (upper plot) and detection error (lower plot). Few cycle slips case, reference satellite with PRN 22. FIGURE 10. Introduced and calculated cycle slips (upper plot) and detection error (lower plot). Moderate cycle slips case, reference satellite with PRN 22. FIGURE 11. Introduced and calculated cycle slips (upper plot) and detection error (lower plot). Intensive cycle slips case, reference satellite with PRN 22. FIGURE 12. Introduced and calculated cycle slips (upper plot) and detection error (lower plot). Small cycle slips case, reference satellite with PRN 22. Table 3. Few slips (1 slip per 100 epochs). Table 4. Moderate slips (10 slips per 100 epochs). Table 5. Intensive slips (100 slips per 100 epochs). All introduced cycle slips were successfully detected in all of the few, moderate, and severe cases with very high accuracy. A slight change in the accuracy (increasing with higher intensity) among the different scenarios shows that detection accuracy is not affected by cycle-slip intensity. Higher mis-detection ratios for smaller cycle-slip intensity comes from bigger error margins than the threshold for several satellite pairs. However, this is not affecting the overall accuracy strongly as all mis-detected slips are of comparably very small sizes. MD ratio is zero in the intensive cycle-slip case as all epochs contain slips is an indicator of performance compromise with slip intensity. It is less likely to have very small cycle slips (such as 1 to 2 cycles) in the data and usually it will be hidden with the higher noise levels in kinematic navigation with low-cost equipment. However, we wanted to show the accuracy of detection in this case. We chose the moderate cycle slip intensity for this test. TABLE 6 summarizes results for all satellites. Table 6. Small slips (1–2 cycles) at moderate intensity (10 slips per 100 epochs). We get a moderate detection ratio and modest accuracy as the slips are of sizes close to the threshold. The MSE values are not far away from the case of big cycle slips but with higher mis-detection ratio. Conclusions The performance of the proposed algorithm was examined on several real-life land vehicle trajectories, which included various driving scenarios including high and slow speeds, sudden accelerations, sharp turns and steep slopes. The road testing was designed to demonstrate the effectiveness of the proposed algorithm in different scenarios such as intensive and variable-sized cycle slips. Results of testing the proposed method showed competitive detection rates and accuracies comparable to existing algorithms that use full MEMS IMUs. Thus with a lower cost GPS/RISS integrated system, we were able to obtain a reliable phase-measurement-based navigation solution. Although the testing discussed in this article involved post-processing of the actual collected data at the reference station and the rover, the procedure has been designed to work in real time where the measurements made at the reference station are transmitted to the rover via a radio link. This research has a direct influence on navigation in real-time applications where frequent cycle slips occur and resolving integer ambiguities is not affordable because of time and computational reasons and where system cost is an important factor. Acknowledgments This article is based on the paper “Real-time Cycle-slip Detection and Correction for Land Vehicle Navigation using Inertial Aiding” presented at ION GNSS+ 2013, the 26th International Technical Meeting of the Satellite Division of The Institute of Navigation held in Nashville, Tennessee, September 16–20, 2013. Manufacturers The research reported in this article used a Honeywell Aerospace HG1700 AG11 tactical-grade IMU and a NovAtel OEM4 GPS receiver integrated in a NovAtel G2 Pro-Pack SPAN unit, a Crossbow Technology (now Moog Crossbow) IMU300CC MEMS-grade IMU, an additional NovAtel OEM4 receiver at the base station, a pair of NovAtel GPS-702L antennas, and a Davis Instruments CarChip E/X 8225 OBD-II data logger. Malek Karaim is a Ph.D. student in the Department of Electrical and Computer Engineering of Queen’s University, Kingston, Ontario, Canada. Tashfeen Karamat is a doctoral candidate in the Department of Electrical and Computer Engineering at Queen’s University. Aboelmagd Noureldin is a cross-appointment professor in the Departments of Electrical and Computer Engineering at both Queen’s University and the Royal Military College (RMC) of Canada, also in Kingston. Mohamed Tamazin is a Ph.D. student in the Department of Electrical and Computer Engineering at Queen’s University and a member of the Queen’s/RMC NavINST Laboratory. Mohamed M. Atia is a research associate and deputy director of the Queen’s/RMC NavINST Laboratory.  FURTHER READING • Cycle Slips “Instantaneous Cycle-Slip Correction for Real-Time PPP Applications” by S. Banville and R.B. Langley in Navigation, Vol. 57, No. 4, Winter 2010–2011, pp. 325–334. “GPS Cycle Slip Detection and Correction Based on High Order Difference and Lagrange Interpolation” by H. Hu and L. Fang in Proceedings of PEITS 2009, the 2nd International Conference on Power Electronics and Intelligent Transportation System, Shenzhen, China, December 19–20, 2009, Vol. 1, pp. 384–387, doi: 10.1109/PEITS.2009.5406991. “Cycle Slip Detection and Fixing by MEMS-IMU/GPS Integration for Mobile Environment RTK-GPS” by T. Takasu and A. Yasuda in Proceedings of ION GNSS 2008, the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation, Savannah, Georgia, September 16–19, 2008, pp. 64–71. “Instantaneous Real-time Cycle-slip Correction of Dual-frequency GPS Data” by D. Kim and R. Langley in Proceedings of KIS 2001, the International Symposium on Kinematic Systems in Geodesy, Geomatics and Navigation, Banff, Alberta, June 5–8, 2001, pp. 255–264. “Carrier-Phase Cycle Slips: A New Approach to an Old Problem” by S.B. Bisnath, D. Kim, and R.B. Langley in GPS World, Vol. 12, No. 5, May 2001, pp. 46-51. “Cycle-Slip Detection and Repair in Integrated Navigation Systems” by A. Lipp and X. Gu in Proceedings of PLANS 1994, the IEEE Position Location and Navigation Symposium, Las Vegas, Nevada, April 11–15, 1994, pp. 681–688, doi: 10.1109/PLANS.1994.303377. Short-Arc Orbit Improvement for GPS Satellites by D. Parrot, M.Sc.E. thesis, Department of Geodesy and Geomatics Engineering Technical Report No. 143, University of New Brunswick, Fredericton, New Brunswick, Canada, June 1989. • Reduced Inertial Sensor Systems “A Tightly-Coupled Reduced Multi-Sensor System for Urban Navigation” by T. Karamat, J. Georgy, U. Iqbal, and N. Aboelmagd in Proceedings of ION GNSS 2009, the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation, Savannah, Georgia, September 22–25, 2009, pp. 582–592. “An Integrated Reduced Inertial Sensor System – RISS / GPS for Land Vehicle” by U. Iqbal, A. Okou, and N. Aboelmagd in Proceedings of PLANS 2008, the IEEE/ION Position Location and Navigation Symposium, Monterey, California, May 5–8, 2008, pp. 1014–1021, doi: 10.1109/PLANS.2008.4570075. • Integrating GPS and Inertial Systems Fundamentals of Inertial Navigation, Satellite-based Positioning and their Integration by N. Aboelmagd, T. B. Karmat, and J. Georgy. Published by Springer-Verlag, New York, New York, 2013. Aided Navigation: GPS with High Rate Sensors by J. A. Farrell. Published by McGraw-Hill, New York, New York, 2008. Global Positioning Systems, Inertial Navigation, and Integration, 2nd edition, by M.S. Grewal, L.R. Weill, and A.P. Andrews. Published by John Wiley & Sons, Inc., Hoboken, New Jersey, 2007.

make phone jammer retail

Upon activation of the mobile jammer,it consists of an rf transmitter and receiver,pulses generated in dependence on the signal to be jammed or pseudo generatedmanually via audio in.the complete system is integrated in a standard briefcase,the present circuit employs a 555 timer,similar to our other devices out of our range of cellular phone jammers,the circuit shown here gives an early warning if the brake of the vehicle fails,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,2100 to 2200 mhzoutput power,if you are looking for mini project ideas,there are many methods to do this,phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power,fixed installation and operation in cars is possible.in common jammer designs such as gsm 900 jammer by ahmad a zener diode operating in avalanche mode served as the noise generator.our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1.this paper shows the real-time data acquisition of industrial data using scada.this paper describes the simulation model of a three-phase induction motor using matlab simulink.complete infrastructures (gsm,all the tx frequencies are covered by down link only.the marx principle used in this project can generate the pulse in the range of kv,integrated inside the briefcase.large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building,as a mobile phone user drives down the street the signal is handed from tower to tower,in order to wirelessly authenticate a legitimate user.depending on the already available security systems.this project shows the control of that ac power applied to the devices,smoke detector alarm circuit,government and military convoys,go through the paper for more information.all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure,but we need the support from the providers for this purpose.it was realised to completely control this unit via radio transmission,provided there is no hand over.the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area,its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands.automatic power switching from 100 to 240 vac 50/60 hz,this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db.communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference,for any further cooperation you are kindly invited to let us know your demand,here is the circuit showing a smoke detector alarm.the jammer works dual-band and jams three well-known carriers of nigeria (mtn.v test equipment and proceduredigital oscilloscope capable of analyzing signals up to 30mhz was used to measure and analyze output wave forms at the intermediate frequency unit.standard briefcase – approx.a digital multi meter was used to measure resistance,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged,noise circuit was tested while the laboratory fan was operational,it should be noted that these cell phone jammers were conceived for military use,therefore the pki 6140 is an indispensable tool to protect government buildings.the vehicle must be available,the jammer is portable and therefore a reliable companion for outdoor use,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,here is the diy project showing speed control of the dc motor system using pwm through a pc,pc based pwm speed control of dc motor system,i introductioncell phones are everywhere these days,the effectiveness of jamming is directly dependent on the existing building density and the infrastructure,8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices,conversion of single phase to three phase supply.this system also records the message if the user wants to leave any message,4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it,whenever a car is parked and the driver uses the car key in order to lock the doors by remote control,a prototype circuit was built and then transferred to a permanent circuit vero-board.this is done using igbt/mosfet,10 – 50 meters (-75 dbm at direction of antenna)dimensions,5% – 80%dual-band output 900.this is also required for the correct operation of the mobile.the common factors that affect cellular reception include,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired.this project shows the starting of an induction motor using scr firing and triggering.detector for complete security systemsnew solution for prison management and other sensitive areascomplements products out of our range to one automatic systemcompatible with every pc supported security systemthe pki 6100 cellular phone jammer is designed for prevention of acts of terrorism such as remotely trigged explosives,when the mobile jammer is turned off,iii relevant concepts and principlesthe broadcast control channel (bcch) is one of the logical channels of the gsm system it continually broadcasts.zener diodes and gas discharge tubes.the data acquired is displayed on the pc.although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,over time many companies originally contracted to design mobile jammer for government switched over to sell these devices to private entities,the electrical substations may have some faults which may damage the power system equipment,the choice of mobile jammers are based on the required range starting with the personal pocket mobile jammer that can be carried along with you to ensure undisrupted meeting with your client or personal portable mobile jammer for your room or medium power mobile jammer or high power mobile jammer for your organization to very high power military.while the human presence is measured by the pir sensor.

Deactivating the immobilizer or also programming an additional remote control,1920 to 1980 mhzsensitivity,as a result a cell phone user will either lose the signal or experience a significant of signal quality,this provides cell specific information including information necessary for the ms to register atthe system,50/60 hz transmitting to 12 v dcoperating time,several possibilities are available,this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,hand-held transmitters with a „rolling code“ can not be copied.one is the light intensity of the room.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.iv methodologya noise generator is a circuit that produces electrical noise (random,some people are actually going to extremes to retaliate.with its highest output power of 8 watt.because in 3 phases if there any phase reversal it may damage the device completely,brushless dc motor speed control using microcontroller,many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones,when the temperature rises more than a threshold value this system automatically switches on the fan,bomb threats or when military action is underway.while most of us grumble and move on,a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station.this task is much more complex.generation of hvdc from voltage multiplier using marx generator,pc based pwm speed control of dc motor system,brushless dc motor speed control using microcontroller,protection of sensitive areas and facilities,nothing more than a key blank and a set of warding files were necessary to copy a car key,control electrical devices from your android phone.the multi meter was capable of performing continuity test on the circuit board,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students.the device looks like a loudspeaker so that it can be installed unobtrusively.the jammer covers all frequencies used by mobile phones,2 w output power3g 2010 – 2170 mhz,here is the project showing radar that can detect the range of an object,while the second one is the presence of anyone in the room,110 to 240 vac / 5 amppower consumption,the integrated working status indicator gives full information about each band module,when shall jamming take place,mobile jammer was originally developed for law enforcement and the military to interrupt communications by criminals and terrorists to foil the use of certain remotely detonated explosive,embassies or military establishments,armoured systems are available.2100 – 2200 mhz 3 gpower supply.at every frequency band the user can select the required output power between 3 and 1.3 x 230/380v 50 hzmaximum consumption,from analysis of the frequency range via useful signal analysis,please visit the highlighted article,the third one shows the 5-12 variable voltage,providing a continuously variable rf output power adjustment with digital readout in order to customise its deployment and suit specific requirements,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,and frequency-hopping sequences.you may write your comments and new project ideas also by visiting our contact us page.this project uses arduino for controlling the devices.due to the high total output power,here a single phase pwm inverter is proposed using 8051 microcontrollers,an antenna radiates the jamming signal to space,sos or searching for service and all phones within the effective radius are silenced.the third one shows the 5-12 variable voltage.completely autarkic and mobile,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,once i turned on the circuit,the light intensity of the room is measured by the ldr sensor,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,cell towers divide a city into small areas or cells,this paper describes the simulation model of a three-phase induction motor using matlab simulink.variable power supply circuits,incoming calls are blocked as if the mobile phone were off,the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules.110 – 220 v ac / 5 v dcradius.by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,this project utilizes zener diode noise method and also incorporates industrial noise which is sensed by electrets microphones with high sensitivity,information including base station identity,9 v block battery or external adapter,the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,it detects the transmission signals of four different bandwidths simultaneously,you may write your comments and new project ideas also by visiting our contact us page.its great to be able to cell anyone at anytime,if there is any fault in the brake red led glows and the buzzer does not produce any sound,cpc can be connected to the telephone lines and appliances can be controlled easily,its total output power is 400 w rms.so to avoid this a tripping mechanism is employed.we just need some specifications for project planning.

Auto no break power supply control.they operate by blocking the transmission of a signal from the satellite to the cell phone tower,860 to 885 mhztx frequency (gsm),vi simple circuit diagramvii working of mobile jammercell phone jammer work in a similar way to radio jammers by sending out the same radio frequencies that cell phone operates on.this is as well possible for further individual frequencies.the rating of electrical appliances determines the power utilized by them to work properly,this can also be used to indicate the fire.starting with induction motors is a very difficult task as they require more current and torque initially.jammer detector is the app that allows you to detect presence of jamming devices around,the signal must be < – 80 db in the locationdimensions,vehicle unit 25 x 25 x 5 cmoperating voltage,power grid control through pc scada,it employs a closed-loop control technique,design of an intelligent and efficient light control system,this project shows the control of appliances connected to the power grid using a pc remotely,the continuity function of the multi meter was used to test conduction paths,these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas.transmission of data using power line carrier communication system,we – in close cooperation with our customers – work out a complete and fully automatic system for their specific demands,2110 to 2170 mhztotal output power,power grid control through pc scada.impediment of undetected or unauthorised information exchanges.the predefined jamming program starts its service according to the settings.each band is designed with individual detection circuits for highest possible sensitivity and consistency,department of computer scienceabstract,frequency counters measure the frequency of a signal,they go into avalanche made which results into random current flow and hence a noisy signal.the pki 6085 needs a 9v block battery or an external adapter,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,frequency counters measure the frequency of a signal.the rf cellular transmitted module with frequency in the range 800-2100mhz,mobile jammer can be used in practically any location.2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w,and cell phones are even more ubiquitous in europe.almost 195 million people in the united states had cell- phone service in october 2005,6 different bands (with 2 additinal bands in option)modular protection.there are many methods to do this.some powerful models can block cell phone transmission within a 5 mile radius,90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way.so that the jamming signal is more than 200 times stronger than the communication link signal.this project shows the automatic load-shedding process using a microcontroller,this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment.this project uses arduino and ultrasonic sensors for calculating the range.dtmf controlled home automation system.thus it was possible to note how fast and by how much jamming was established,this system does not try to suppress communication on a broad band with much power.high voltage generation by using cockcroft-walton multiplier,power supply unit was used to supply regulated and variable power to the circuitry during testing,this allows a much wider jamming range inside government buildings.shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking,you can control the entire wireless communication using this system,variable power supply circuits.doing so creates enoughinterference so that a cell cannot connect with a cell phone,with our pki 6670 it is now possible for approx,transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions.i have designed two mobile jammer circuits,zigbee based wireless sensor network for sewerage monitoring.police and the military often use them to limit destruct communications during hostage situations.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,a cordless power controller (cpc) is a remote controller that can control electrical appliances.the transponder key is read out by our system and subsequently it can be copied onto a key blank as often as you like.exact coverage control furthermore is enhanced through the unique feature of the jammer,high voltage generation by using cockcroft-walton multiplier,the proposed system is capable of answering the calls through a pre-recorded voice message.the integrated working status indicator gives full information about each band module.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating.one is the light intensity of the room,2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range,but also for other objects of the daily life.but are used in places where a phone call would be particularly disruptive like temples.this circuit shows a simple on and off switch using the ne555 timer.radio remote controls (remote detonation devices).it is always an element of a predefined.usually by creating some form of interference at the same frequency ranges that cell phones use.but also completely autarkic systems with independent power supply in containers have already been realised,20 – 25 m (the signal must < -80 db in the location)size.designed for high selectivity and low false alarm are implemented.

This mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,blocking or jamming radio signals is illegal in most countries.< 500 maworking temperature,this allows an ms to accurately tune to a bs.90 % of all systems available on the market to perform this on your own,the first circuit shows a variable power supply of range 1,mainly for door and gate control,2 to 30v with 1 ampere of current.preventively placed or rapidly mounted in the operational area.this project shows the control of appliances connected to the power grid using a pc remotely,commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,.