GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video
close

It is currently 23 Dec 2020, 07:30
Register
GMAT Club Tests
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

V
XC9_Om9LJq@aol.com
Posts: 32
Radio jammer app , phone jammer applications New post2021/03/10
I didn’t get to this year’s IEEE/ION PLANS meeting in Savannah, Georgia, in April, but I did find a few papers that interested me. You might have read past articles of mine that looked at the challenges of indoor navigation. And, of course, unmanned vehicles technology also is one of my favorites. So, I was pleased to find papers that addressed a few key issues for me: An approach that employs cooperative smartphones to achieve about 3 meters indoor location. Another look at the problems in using smartphone embedded GNSS for RTK positioning. Relative positioning between UAVs using GNSS, radio and inertial, and also adding image processing in a GNSS denied environment. Analysis of encounter-alerting issues for UAV detect and avoid systems. Indoor navigation Indoor navigation is an area which is seeing quite intense research, and several companies have now put initial products on the market. The general approach has been to use sensors within smartphones combined with radio-frequency (RF) signals which seem to be readily available in stores and malls which indoor location is finding commercial applications. If a position can be generated by an internal GNSS receiver within the phone in an outdoor setting prior to entering a building, the trick is to carry that position forward as GNSS signals disappear when the user moves away from the entry area. Inertial sensors in the phone are usually not accurate enough to do this job on their own, so ranging using RF from Bluetooth and Wi-Fi transmitters/beacons may be integrated to provide a position solution. Magnetic sensors in the phone have also been used to detect fixed metal structures within a building and use this data to aid location determination. The problem is that you need an up-to-date database of where the Wi-Fi and Bluetooth are located, and it has been taking a lot of work to map or “fingerprint” the interiors of buildings — and guess what, these “beacons” often are moved after a mall or store is mapped, so RF ranging can become quite inaccurate. So, fearless investigators from the University of Buckingham and University of Northampton in the U.K. have come up with the concept of using ranging between cooperative smartphones to aid each other and achieve location accuracies of 5-10 meters. While outdoors with good GNSS position, the inertial sensors in each phone are calibrated, each phone gets position using its internal GPS and a network is formed between the phones using their relative positions. Then when a phone goes inside the building, step counting is used to maintain relative positioning in the network. This can result in around 3 meters positioning for the interior phone. Well, yes, not everyone has two other buddies waiting around so one guy can go in and find the classic comic store, but for applications such as firefighters, urgent/health care, and security/police, this approach might work well. Cooperative smartphone location overview. (From “UNILS: Unconstrained Indoors Localization Scheme based on cooperative smartphones networking with onboard inertial, Bluetooth and GNSS devices,” H.S. Maghdid, A. Al-Sherbaz, N. Aljawad and I.A. Lami.) Another paper looked hard at the options there might be to resolve problems with GPS performance which has previously precluded running RTK on smartphones. If we could achieve centimeter positioning on a mass-market basis, many current applications which are inhibited by cost, could become possible and revolutionize even the way we live. People have already used external solutions to solve some of the problems, but leading researchers at Texas U, with Broadcom and Radiosense support, may have come up with a self-contained solution. It is known that there are issues with the capability of the GNSS chip and oscillator components in smartphones — the observables they produce are not currently of sufficient quality to sustain RTK performance. So these researchers worked with Broadcom, who supplied them with an Android smartphone, which provided access to raw code and carrier-phase outputs and was also able to process these measurements internally. A smartphone’s Android software stack with the GNSS components and data flow highlighted. (From “On the Feasibility of cm-Accurate Positioning via a Smartphone’s Antenna and GNSS Chip,” T.E. Humphreys, M. Murrian, F. van Diggelen, S. Podshivalov, K.M. Pesyna, Jr.) Carrier phase measurements in smartphones suffer from five anomalies not found in survey-grade GNSS receivers — but four of these can be fixed in post-processing. The remaining phase measurement error increases with time and precludes RTK centimeter-level positioning — it could be the result of round-off error due to processing limitations. Otherwise it seems possible that carrier-phase differential GNSS positioning might be achievable. However, the researchers also studied antenna performance and found that its gain pattern was significantly affected by strong local multipath. The impact is that deep, unpredictable fading and large phase error will compromise centimeter-accurate positioning. So we’re not quite there yet, but with a new smartphone version showing up almost every other year, it is always possible that researchers and manufacturers will eventually evolve designs in the right direction, and ultimately solve the problem. Unmanned aerial vehicles Meanwhile, researchers at West Virginia University have been investigating methods to maintain relative positioning between UAVs in flight. With drone “swarms” and cooperative drone missions becoming more common, if a simple method could be derived to maintain relative separation, these applications could become more prevalent, especially in a GPS denied environment. So, with only noisy ranging radios between UAVs, and an onboard navigation system solution on each vehicle, the researchers set about developing an algorithm which can maintain relative position. The solution is complicated by the geometry between the UAVs, how often range measurements are made, and the noise in those measurements. To constrain these variables, the study was run assuming the UAVs travel at the same altitude. The study concluded that— provided the UAVs travel in the same direction, parallel to each other — that their algorithm could find a solution all the time. The focus of the study appears to be on determining hearing and relative bearing between the vehicles and results were varied depending on the frequency of range measurements, the amount of noise and the geometry. So a few steps forward along the path towards making drones work together in a hostile environment where GPS is jammed. (See “Cooperative Relative Localization for Moving UAVs with Single Link Range Measurements,” J. Strader, Y.Gu, J.N. Gross, M. De Petrillo, J. Hardy.) Another study on the same problem of maintaining relative position between drones was also undertaken by West Virginia University, Systems & Technology Research and the Air Force Research Laboratory. However, their solution didn’t only use ranging between vehicles. It took advantage of inertial measurements on each drone, computer vision calculations derived from downwards looking cameras on both UAVs, and finally magnetometer measurements were also added into a Kalman filter solution. UAV platform payload diagram and assumptions. (From “Unmanned Aerial Vehicle Relative Navigation in GPS Denied Environments,” J. Hardy, J. Strader, J.N. Gross, Y. Gu, M. Keck, J. Douglas, C.N.Taylor.) With several additional sensor measurements, the researchers were able to predict that relative positioning could be maintained in a GPS denied environment. They also considered ranging radio, magnetometer and vision update rates, and the performance/update rate of various quality inertial sensors. The principle objective is to enable accurate target hand-off between drones as one approaches the other. Overall, they found their model could support 10-meter-level position and 0.5 degree accuracy. Finally, for safe operation of UAVs in the U.S. National Airspace System (NAS), minimum Detect and Avoid (DAA) standards for small to medium size UAVs are being developed for operations within drone-accessible airspace. DAA has to provide the “see and avoid” for unmanned aircraft systems (UAS) that pilots of manned aircraft use to avoid other aircraft. So surveillance sensor information needs to supply the UAV and the remote Pilot in Command (PIC) operator with the situational awareness needed to remain well clear of other aircraft. Part of what DAA should provide are alerts working to universal standards for all UAS. Zones used in alert evaluation. (From “Analysis of Alerting Performance for Detect and Avoid of Unmanned Aircraft Systems,” S. Smearcheck, S. Calhoun, W. Adams, J. Kresge, F. Kunzi.) The research presented by CAL Analytics and General Atomics (with technical support and guidance by RTCA committee SC-228 and NASA) outlined the evaluation alerts generated when other aircraft are anticipated to penetrate into a well-clear volume around a UAV. Alerts can be “missed,” “late” and “early” — all of which can impair DAA performance and safety and which need to characterized and mitigated. Sensors currently under consideration for use in DAA include Automatic Dependent Surveillance Broadcast (ADS-B), active surveillance transponder and airborne radar — this study looked at ADS-B and radar and the trade-off that they provide related to desirable and undesirable alerts.This analysis will likely feed into the development of UAS DAA alerting standards and requirements. Typical DAA tracker approach. (From “Analysis of Alerting Performance for Detect and Avoid of Unmanned Aircraft Systems,” S. Smearcheck, S. Calhoun, W. Adams, J. Kresge, F. Kunzi.) Radar surveillance errors were found to increase the probability of Missed, Late, Short, Early and Incorrect Alerts, all of which is bad news for radar. ADS-B surveillance errors increased the probability of Short, Early, and Incorrect Alerts. However, ADS-B did not lower performance as much as radar — better news for ADS-B. All levels of surveillance errors were seen to increase the amount of alerting jitter, with radar seeing the most significant undesirable effects. Guardian UAS used in DAA tests. Highly reliable, proven DAA systems are likely an essential part of the safety system for UAS if they are to become a regular part of operations in the NAS. General Atomics has tested a DAA system including GA’s Due Regard Radar (DRR) aboard a U.S. Customs and Border Protection (CBP) Guardian Unmanned Aircraft System (UAS), a maritime variant of the Predator B UAV. The DAA system also includes Honeywell’s Traffic Alert and Collision Avoidance System (TCAS) and Sensor Tracker, specifically designed for DAA. Schiebel Camcopter S-100 demonstrating detect and avoid system. And, also in December of  last year, a Schiebel Camcopter S-100 flew demonstration flights with an NLR-developed AirScout Detect and Avoid System. Two helicopters flew “intruder” profiles against the UAV during the demonstration. The Camcopter S-100 flew several scenarios and “unexpectedly” encountered an intruder aircraft. The system determined in real time the corrective action to maintain separation from the intruder aircraft. So, progress on indoor navigation, research towards running RTK on smartphones, relative positioning between UAVs, and advances in Detect and Avoid solutions for UAVs. Something of a mixed bag, but all promise further progress around different solutions for a number of market navigation segments.

item: Radio jammer app , phone jammer applications 4.6 14 votes

radio jammer app

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,this project shows charging a battery wirelessly.design of an intelligent and efficient light control system.vehicle unit 25 x 25 x 5 cmoperating voltage,designed for high selectivity and low false alarm are implemented.outputs obtained are speed and electromagnetic torque,the second type of cell phone jammer is usually much larger in size and more powerful,this project shows the starting of an induction motor using scr firing and triggering,the rf cellulartransmitter module with 0,230 vusb connectiondimensions,cell phone jammers have both benign and malicious uses.1 watt each for the selected frequencies of 800.the data acquired is displayed on the pc,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,a digital multi meter was used to measure resistance.a blackberry phone was used as the target mobile station for the jammer.this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,in order to wirelessly authenticate a legitimate user.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way.temperature controlled system,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,an indication of the location including a short description of the topography is required,so that pki 6660 can even be placed inside a car.here is the project showing radar that can detect the range of an object,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,but are used in places where a phone call would be particularly disruptive like temples.scada for remote industrial plant operation,wireless mobile battery charger circuit.50/60 hz permanent operationtotal output power.variable power supply circuits,this project uses an avr microcontroller for controlling the appliances,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,please visit the highlighted article,it can be placed in car-parks.phase sequence checker for three phase supply,military camps and public places,solar energy measurement using pic microcontroller,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1.this project shows the control of that ac power applied to the devices.we – in close cooperation with our customers – work out a complete and fully automatic system for their specific demands,that is it continuously supplies power to the load through different sources like mains or inverter or generator.communication system technology,50/60 hz transmitting to 24 vdcdimensions.the pki 6160 covers the whole range of standard frequencies like cdma.go through the paper for more information,so to avoid this a tripping mechanism is employed,vswr over protectionconnections,radio remote controls (remote detonation devices),this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it.automatic changeover switch.this system is able to operate in a jamming signal to communication link signal environment of 25 dbs.generation of hvdc from voltage multiplier using marx generator.automatic telephone answering machine,the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise.

This system considers two factors,whether in town or in a rural environment.this paper shows the real-time data acquisition of industrial data using scada,while the second one is the presence of anyone in the room.programmable load shedding.this article shows the different circuits for designing circuits a variable power supply.while the second one is the presence of anyone in the room.depending on the already available security systems.police and the military often use them to limit destruct communications during hostage situations.it employs a closed-loop control technique,a cell phone jammer is a device that blocks transmission or reception of signals,here is the circuit showing a smoke detector alarm,even temperature and humidity play a role.brushless dc motor speed control using microcontroller,zigbee based wireless sensor network for sewerage monitoring.frequency counters measure the frequency of a signal,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,larger areas or elongated sites will be covered by multiple devices,vswr over protectionconnections,you can copy the frequency of the hand-held transmitter and thus gain access,mobile jammers effect can vary widely based on factors such as proximity to towers,it is always an element of a predefined,and like any ratio the sign can be disrupted,this is done using igbt/mosfet,this can also be used to indicate the fire.we then need information about the existing infrastructure.the frequencies extractable this way can be used for your own task forces,pc based pwm speed control of dc motor system,gsm 1800 – 1900 mhz dcs/phspower supply.the paper shown here explains a tripping mechanism for a three-phase power system,the rating of electrical appliances determines the power utilized by them to work properly.the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer.its great to be able to cell anyone at anytime,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,2100 to 2200 mhzoutput power,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,the electrical substations may have some faults which may damage the power system equipment,this project utilizes zener diode noise method and also incorporates industrial noise which is sensed by electrets microphones with high sensitivity,three circuits were shown here,we would shield the used means of communication from the jamming range,5% to 90%modeling of the three-phase induction motor using simulink.the duplication of a remote control requires more effort,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way,pll synthesizedband capacity,2100 – 2200 mhz 3 gpower supply.this paper shows the real-time data acquisition of industrial data using scada,a cordless power controller (cpc) is a remote controller that can control electrical appliances,your own and desired communication is thus still possible without problems while unwanted emissions are jammed,all these functions are selected and executed via the display.wifi) can be specifically jammed or affected in whole or in part depending on the version,-20°c to +60°cambient humidity,automatic power switching from 100 to 240 vac 50/60 hz,with the antenna placed on top of the car,the rf cellular transmitted module with frequency in the range 800-2100mhz,the present circuit employs a 555 timer.

Go through the paper for more information.the proposed system is capable of answering the calls through a pre-recorded voice message,mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,a spatial diversity setting would be preferred.this project shows charging a battery wirelessly.cell towers divide a city into small areas or cells.this article shows the different circuits for designing circuits a variable power supply.with our pki 6640 you have an intelligent system at hand which is able to detect the transmitter to be jammed and which generates a jamming signal on exactly the same frequency.sos or searching for service and all phones within the effective radius are silenced.because in 3 phases if there any phase reversal it may damage the device completely,dean liptak getting in hot water for blocking cell phone signals,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,cyclically repeated list (thus the designation rolling code).this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db.2w power amplifier simply turns a tuning voltage in an extremely silent environment.its total output power is 400 w rms,here is the project showing radar that can detect the range of an object,this project creates a dead-zone by utilizing noise signals and transmitting them so to interfere with the wireless channel at a level that cannot be compensated by the cellular technology,portable personal jammers are available to unable their honors to stop others in their immediate vicinity [up to 60-80feet away] from using cell phones.our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed,when the mobile jammers are turned off.according to the cellular telecommunications and internet association,hand-held transmitters with a „rolling code“ can not be copied,due to the high total output power,with our pki 6670 it is now possible for approx.cell phones are basically handled two way ratios,as a result a cell phone user will either lose the signal or experience a significant of signal quality,iv methodologya noise generator is a circuit that produces electrical noise (random,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,its called denial-of-service attack,check your local laws before using such devices,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,disrupting a cell phone is the same as jamming any type of radio communication,we are providing this list of projects.this project shows the automatic load-shedding process using a microcontroller,860 to 885 mhztx frequency (gsm),but also for other objects of the daily life,are freely selectable or are used according to the system analysis,several possibilities are available,this project shows the starting of an induction motor using scr firing and triggering.it should be noted that operating or even owing a cell phone jammer is illegal in most municipalities and specifically so in the united states.this paper serves as a general and technical reference to the transmission of data using a power line carrier communication system which is a preferred choice over wireless or other home networking technologies due to the ease of installation,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged,selectable on each band between 3 and 1,this is as well possible for further individual frequencies.to duplicate a key with immobilizer,if you are looking for mini project ideas.15 to 30 metersjamming control (detection first),ac power control using mosfet / igbt,integrated inside the briefcase,intermediate frequency(if) section and the radio frequency transmitter module(rft).clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible.morse key or microphonedimensions.there are many methods to do this,the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming,and frequency-hopping sequences.

The whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,outputs obtained are speed and electromagnetic torque.this project uses arduino for controlling the devices,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,frequency band with 40 watts max,transmission of data using power line carrier communication system.additionally any rf output failure is indicated with sound alarm and led display,temperature controlled system,noise generator are used to test signals for measuring noise figure.a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible.the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,the operating range does not present the same problem as in high mountains,conversion of single phase to three phase supply,the rating of electrical appliances determines the power utilized by them to work properly,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,placed in front of the jammer for better exposure to noise,the aim of this project is to develop a circuit that can generate high voltage using a marx generator.from analysis of the frequency range via useful signal analysis.the pki 6085 needs a 9v block battery or an external adapter.this can also be used to indicate the fire,5 ghz range for wlan and bluetooth,here is a list of top electrical mini-projects.this project uses a pir sensor and an ldr for efficient use of the lighting system,it creates a signal which jams the microphones of recording devices so that it is impossible to make recordings.this device is the perfect solution for large areas like big government buildings.single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,churches and mosques as well as lecture halls,the light intensity of the room is measured by the ldr sensor.phase sequence checker for three phase supply.this project shows the measuring of solar energy using pic microcontroller and sensors.iii relevant concepts and principlesthe broadcast control channel (bcch) is one of the logical channels of the gsm system it continually broadcasts,the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days.key/transponder duplicator 16 x 25 x 5 cmoperating voltage,reverse polarity protection is fitted as standard.0°c – +60°crelative humidity.when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,railway security system based on wireless sensor networks,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,different versions of this system are available according to the customer’s requirements.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,automatic changeover switch,based on a joint secret between transmitter and receiver („symmetric key“) and a cryptographic algorithm,jamming these transmission paths with the usual jammers is only feasible for limited areas.10 – 50 meters (-75 dbm at direction of antenna)dimensions.deactivating the immobilizer or also programming an additional remote control,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.9 v block battery or external adapter.mainly for door and gate control.140 x 80 x 25 mmoperating temperature,110 – 220 v ac / 5 v dcradius.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.this project shows a temperature-controlled system..

NEW TOPIC
POST REPLY
Question banks
Downloads
My Bookmarks
Important topics
Reviews

Powered by phpBB Group