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Figure 6. Outdoor jamming test campaign. Conception, Realization, Evaluation of a Seven-Element GNSS CRPA By Frederic Leveau, Solene Boucher, Erwan Goron, and Herve Lattard A controlled radiated pattern antenna can be an effective way to protect GPS receivers against jamming. A new CRPA, composed of seven elements, works on the E5a, E5b, E6, L2, and L1 bandwidths. This article reports on radiation pattern measurements of the array in a test facility. Controlled radiation pattern antenna (CRPA) technique is considered to be the best GPS pre-correlation protection technique against interference. It consists of an antenna array and a processing unit that performs a phase-destructive sum of the incoming interference signals, this process being equivalent to making nulls towards interferers in the array radiation pattern. Considering the growing Galileo system and the possible interest of the French Ministry of Defense in the Public Regulated Service (PRS) , a prospective study was undertaken to develop an array compatible with GPS M-code, Galileo PRS, and aeronautical radionavigation signals in the E5 bandwidth. The French Expertise & Procurement Defence Agency (DGA) awarded the French company SATIMO a feasibility contract to design, conceive, realize, and evaluate a circular array composed of seven elementary patch antennas (see Figure 1). Figure 1. CRPA unit receiving satellite and jammer signals. Product Features SATIMO, a company specializing in R&D for antennas and in innovative antenna test ranges, has since developed this GPS-Galileo CRPA antenna, shown below. New CRPA developed by SATIMO. The CRPA consists  of seven elementary patches covering E5a, E5b, L2, E6, L2, and L1 frequency bandwidths, using microstrip multilayer technology. Each element is housed in a 9-centimeter (diameter) by 2-centimeter (height) radome, connector excluded. In that volume, a space provision has been reserved to include a low-noise amplifier (LNA) and two filters for a sharp out-of-band rejection. As a consequence, it is possible to configure three types of arrays: passive without filters, passive with two passband filters, and finally active (including a LNA, with a gain > 26dB, NF Figure 2A. CRPA radiation patterns. Figure 2B. CRPA radiation patterns. The design of the single element has been optimized to control the deviations of each patch antenna when included in a seven-element array. To limit mutual coupling with respect to the array dimensions, the distance between the elements’ phase centers has been chosen close to 0.7 λ at L1 frequency. This value results in a 36.5-centimeter (diameter) array. The standalone antenna and the CRPA antenna have been validated through an environmental testing campaign. Product Development The usual iterative tuning and the optimization process for prototyping have been performed on SATIMO’s arch test range. This test facility indeed significantly reduces the time required to characterize the antenna-under-test (AUT) radiation pattern, in comparison with classical anechoic chamber test facilities. More precisely, the arch test range instantaneously scans the field in one whole site angle cross-section plane, whereas the legacy systems mechanically scan the same cross-section plane by rotating the AUT for each incremental angle value. The spatial sampling of the near-field radiated by the AUT, thanks to a large number of probes along the arch surrounding it, enables a significant savings in time. The near-field results in the current plane can be displayed in real-time on a computer screen. Then, the rotation of AUT around its axis is automatically controlled by the measurement system, and a new acquisition is performed for each new cross-section plane. A Fourier transform computation is eventually applied to the 3D near-field to get the far-field radiation pattern. The radiating characterization of the CRPA has been performed with a SATIMO SG24 system. With such a system, we have measured the complete 3D radiation patterns of each single element in less than 40 minutes per antenna. Evaluation The evaluation of the CRPA array was performed with this test bed in SATIMO’s facility (see photos below). The process  begain with measuring an element alone on a ground plane, in order to extract the gain, the axial ratio, the aperture angle, the matching values, and every feature that defines a fixed-radiation pattern antenna. The evaluation secondly consisted of characterizing the array, that is, extracting the gain and the phase of each element in the array, with respect to a reference element. To implement such a reference anytime during the near-field acquisition process, the arch test range (Figure 3) is very powerful, because all the probes constantly point at the center of the array, despite AUT’s motions. On the contrary, the need for such a reference makes measurements difficult in anechoic chambers, which often require canceling out misalignments, thanks to specific motions that must be taken into account in the computations. CRPA in measurements. CRPA in measurements. Figure 3. Arch test range working principle. Uses Functional tests are another important part of the CRPA unit evaluation. Usually, two kind of tests can be conducted: outdoors or in anechoic chamber. Classical Tests. DGA plans to perform outdoor test campaigns by utilizing an array placed on the roof of an all-terrain vehicle (see photo). The array will be connected to a CRPA GPS processing unit and to a receiver in the vehicle. Some interferers will be located along the trajectory of the vehicle, according to various scenarios defining their waveforms and their power levels. The CRPA capability to reject those interferers can then be assessed. These kinds of outdoor tests naturally suit CRPA’s processing unit and array characterization, as they involve radiated GPS and interfering signals. However, these kinds of tests are not reproducible and are quite complicated to set up. Outdoor jamming test campaign. Some tests in anechoic chambers could be an alternative in order to obtain reproducible test results, but in that case, transmitting GPS constellation signals indoor becomes a challenge. An option could be the use of a GPS signal simulator, but this means a unique direction of arrival of GPS signals. Moreover, no dynamic trajectory could be done. New Test Bed. DGA recently acquired a test bed, developed by INEO Defense, that enables evaluating CRPA units in conducted mode, for example. There is no longer a need to radiate either GPS signals or interfering signals. The purpose of this test bed, called BAnc de Caractérisation des Antennes Réseaux Antibrouillage (BACARA), or test bed to characterize anti-jamming antenna arrays (Figure 4 and Figure 5), is to replace the array and simulate its GPS and jamming environment. This means that it is able to create elementary antenna phase delays and gains resulting from the array geometry, by using finite impulse response (FIR) filters (Figure 6). This is the reason why this test bed must be fed with the array phase and gain measurement results obtained with the arch test range. Figure 4. BACARA test bed. Figure 5. BACARA working principle. Figure 6. BACARA working principle. Alternatively, these results can be obtained with traditional anechoic chamber measurements. 10 channels of a multi-channel GPS simulator, each one matched with a satellite, are used by the test bed. Thus, BACARA coherently sums GPS constellation simulator output channels and interfering signals, so as to accurately simulate the array’s behavior in the laboratory. As a result, for any CRPA processing unit, it is possible to compare the array’s impact on a processing unit with an ideal array being composed of perfect elementary antennas. Unfortunately, BACARA currently operates on L1 or L2, but not on the E6 and E5 bandwidths. On the other hand, this test bed is able to simulate dynamic trajectories, with the mobile positions and attitudes. Up to 10 internal jammers with various waveforms can be set up, and their power levels over time are computed by software like Warfare or Matlab. A numerical calibration allows some transparency of the test bed for CRPA units under test. Figure 7. BACARA graphical user interface. Figure 8. Examples of available simulated array geometry. Conclusion SATIMO, a company specializing in electromagnetic field measurements in the microwave frequency range and part of the Microwave Vision Group, has developed an array for the reception of M-code, PRS, and aeronautical radionavigation signals. This antenna array has been fully evaluated and qualified through electrical and environmental tests. The measurement methods have enabled the company to demonstrate the feasibility of the performances expected. Functional evaluations restricted to GPS are still under way. To do so, DGA will utilize its complementary outdoor and indoor test means, especially its laboratory test bed BACARA, as a tool to precisely evaluate GPS CRPA units. Frederic Leveau works at the French MoD (DGA Information Superiority) as a radionavigation expert. His main interests are Galileo PRS prospective studies and developments and the integration of CRPA systems within French platforms. Solene Boucher works at the French MoD (DGA Information Superiority) as a radionavigation expert. Her main interests are Galileo PRS prospective studies and developments. She is also responsible for the test bed BACARA. Erwan Goron is an engineer at SATIMO Industries (Microwave Vision Group). His main activity is antenna conception. Herve Lattard is an engineer at SATIMO Industries (Microwave Vision Group). His main activity is antenna conception.

phone as jammer line

The if section comprises a noise circuit which extracts noise from the environment by the use of microphone,key/transponder duplicator 16 x 25 x 5 cmoperating voltage, Cell Phone Jammer for sale .livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet,phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power,armoured systems are available,here is a list of top electrical mini-projects.temperature controlled system,this project shows the measuring of solar energy using pic microcontroller and sensors.soft starter for 3 phase induction motor using microcontroller.the first circuit shows a variable power supply of range 1.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,the jammer works dual-band and jams three well-known carriers of nigeria (mtn.religious establishments like churches and mosques,placed in front of the jammer for better exposure to noise,mobile jammers effect can vary widely based on factors such as proximity to towers,the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer,doing so creates enoughinterference so that a cell cannot connect with a cell phone,the pki 6085 needs a 9v block battery or an external adapter.frequency band with 40 watts max.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,this project shows the starting of an induction motor using scr firing and triggering,the paper shown here explains a tripping mechanism for a three-phase power system,each band is designed with individual detection circuits for highest possible sensitivity and consistency.cell phone jammers have both benign and malicious uses,it employs a closed-loop control technique.is used for radio-based vehicle opening systems or entry control systems,and like any ratio the sign can be disrupted,therefore it is an essential tool for every related government department and should not be missing in any of such services,the output of each circuit section was tested with the oscilloscope.blocking or jamming radio signals is illegal in most countries,i can say that this circuit blocks the signals but cannot completely jam them,some powerful models can block cell phone transmission within a 5 mile radius,110 – 220 v ac / 5 v dcradius,there are many methods to do this.

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Due to the high total output power.a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.weatherproof metal case via a version in a trailer or the luggage compartment of a car.three phase fault analysis with auto reset for temporary fault and trip for permanent fault,this project shows the control of home appliances using dtmf technology.the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off,it consists of an rf transmitter and receiver,soft starter for 3 phase induction motor using microcontroller.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way.micro controller based ac power controller.an optional analogue fm spread spectrum radio link is available on request,the light intensity of the room is measured by the ldr sensor,a mobile phone might evade jamming due to the following reason,this is as well possible for further individual frequencies,be possible to jam the aboveground gsm network in a big city in a limited way,generation of hvdc from voltage multiplier using marx generator,-10°c – +60°crelative humidity.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure,your own and desired communication is thus still possible without problems while unwanted emissions are jammed.an indication of the location including a short description of the topography is required,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,50/60 hz transmitting to 12 v dcoperating time.this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,communication system technology.cell towers divide a city into small areas or cells,the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,2 – 30 m (the signal must < -80 db in the location)size,solar energy measurement using pic microcontroller.i have designed two mobile jammer circuits.this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,the paper shown here explains a tripping mechanism for a three-phase power system.a jammer working on man-made (extrinsic) noise was constructed to interfere with mobile phone in place where mobile phone usage is disliked,band selection and low battery warning led.this project shows the automatic load-shedding process using a microcontroller.

3 w output powergsm 935 – 960 mhz,4 ah battery or 100 – 240 v ac,and cell phones are even more ubiquitous in europe,this sets the time for which the load is to be switched on/off,where shall the system be used,.