Gsm signal | signal jamming pricing license

A Case History Using the New Galileo E6-B/C Signal By Sergei Yudanov, JAVAD GNSS A method of decoding an unknown pseudorandom noise code uses a conventional GNSS antenna and receiver with modified firmware. The method was verified using the signals from the Galileo In-Orbit Validation satellites. Decoding an unknown GNSS pseudorandom noise (PRN) code can be rather easily done using a high-gain steerable dish antenna as was used, for example, in determine the BeiDou-M1 broadcast codes before they were publicly announced. The signal-to-noise ratio within one chip of the code is sufficient to determine its sign. This article describes a method of getting this information using a conventional GNSS antenna and receiver with modified firmware. The method was verified using the signals from the Galileo In-Orbit Validation (IOV) satellites. In spite of the fact that only pilot signal decoding seems to be possible at first glance, it is shown that in practice data signals can also be decoded. Concept The idea is to do coherent accumulation of each chip of an unknown signal during a rather long time interval. The interval may be as long as a full satellite pass; for medium Earth orbits, this could be up to six hours. One of the receiver’s channels is configured in the same way as for signal tracking. The I and Q signal components are accumulated during one chip length in the digital signal processor, and these values are added to an array cell, referenced by chip number, by the processor. Only a limited amount of information need be known about the signal: its RF frequency; the expected chip rate; the expected total code length; and the modulation method. The decoding of binary-phase-shift-keying (BPSK) signals (as most often used) is the subject of this article. It appears that the decoding of more complicated signals is possible too, but this should be proved. A limitation of this method (in common with that of the dish method) is the maximum total code length that can be handled: for lengths greater than one second and bitrates higher than 10,000 kilobits per second, the receiver’s resources may not be sufficient to deal with the signal. Reconstructing the Signal’s Phase This method requires coherency. During the full accumulation period, the phase difference between the real signal phase and the phase of the signal generated by the receiver’s channel should be much less than one cycle of the carrier frequency. Depending on the GNSS’s available signals, different approaches may be used. The simplest case is reconstruction of a third signal while two other signals on different frequencies are of known structure and can be tracked. The main (and possibly the only significant) disturbing factor is the ionosphere. The ionospheric delay (or, more correctly, the variation of ionospheric delay) is calculated using the two known tracked signals, then the phase of the third signal, as affected by the ionosphere, is predicted. The final formula (the calculations are trivial and are widely available in the literature) is: where: φ1 , f1 are the phase and frequency of the first signal in cycles and Hz, respectively φ2 , f2 are the phase and frequency of the second signal in cycles and Hz, respectively φ3 , f3 are the phase and frequency of the third signal in cycles and Hz, respectively. It was confirmed that for all pass periods (elevation angles less than 10 degrees were not tested), the difference between the calculated phase and real phase was always less than one-tenth of a cycle. GPS Block IIF satellites PRN 1 and PRN 25 were used to prove this: the L1 C/A-code and L5 signals were used as the first and second signals, with the L2C signal as the third unknown. If two known signals are not available, and the ionospheric delay cannot be precisely calculated, it is theoretically possible to obtain an estimate of the delay from one or more neighboring satellites with two signals available. Calculations and estimations should be carried out to investigate the expected precision. The Experiment The Galileo E6-B/C signal as currently transmitted by the IOV satellites was selected for the experiment, as its structure has not been published. The E6 signal has three components: E6-A, E6-B and E6-C. The E6-A component is part of the Galileo Public Regulated Service, while the two other components will serve the Galileo Commercial Service. The E6-B component carries a data signal, while the E6-C component is a pilot signal. From open sources, it is known that the carrier frequency of the E6 signal is 1278.75 MHz and that the E6-B and E6-C components use BPSK modulation at 5,115 chips per millisecond with a primary code length of one millisecond. E6-B’s data rate is 1,000 bits per second and the total length of the pilot code is 100 milliseconds (a secondary code of 100 bits over 100 milliseconds is also present in the E6-C signal, which aids in signal acquisition). A slightly modified commercial high-precision multi-GNSS receiver, with the E6 band and without the GLONASS L2 band, was used for this experiment. The receiver was connected to a conventional GNSS antenna, placed on a roof and was configured as described above. The E1 signal was used as the first signal and E5a as the second signal. The E6 code tracking (using 5,115 chip values of zero) was 100 percent guided from the E1 code tracking (the changing of the code delay in the ionosphere was ignored). The E6 phase was guided from E1 and E5a using the above equation. Two arrays for 511,500 I and Q samples were organized in firmware. The integration period was set to one chip (200 nanoseconds). Galileo IOV satellite PRN 11 (also variously known as E11, ProtoFlight Model and GSAT0101) was used initially, and the experiment started when the satellite’s elevation angle was about 60 degrees and lasted for only about 30 minutes. Then the I and Q vectors were downloaded to a PC and analyzed. Decoding of Pilot Signal (E6-C) Decoding of the pilot signal is made under the assumption that any possible influence of the data signal is small because the number of ones and zeros of E6-B in each of 511,500 chips of the 100-millisecond integration interval is about the same. First, the secondary code was obtained. Figure 1 shows the correlation of the first 5,115 chips with 5,115 chips shifted by 0 to 511,500 chips. Because the initial phase of the E6 signal is unknown, two hypotheses for computing the amplitude or signal level were checked: [A] = [I] + [Q] and [A] = [I] – [Q], and the combination with the higher correlation value was selected for all further analysis. Figure 1. Un-normalized autocorrelation of E6-C signal chips. In Figure 1, the secondary code is highly visible: we see a sequence of 100 positive and negative correlation peaks (11100000001111 …; interpreting the negative peaks as zeros).This code is the exact complement (all bits reversed) of the published E5a pilot secondary code for this satellite. More will be said about the derived codes and their complements later. It appears that, for all of the IOV satellites, the E6-C secondary codes are the same as the E5a secondary codes. After obtaining the secondary code, it is possible to coherently add all 100 milliseconds of the integration interval with the secondary code sign to increase the energy in each chip by 100 times. Proceeding, we now have 5,115 chips of the pilot signal — the E6-C primary code. To understand the correctness of the procedure and to check its results, we need to confirm that there is enough signal energy in each chip. To this end, a histogram of the pilot signal chip amplitudes can be plotted (see Figure 2). We see that there is nothing in the middle of the plot. This means that all 5,115 chips are correct, and there is no chance that even one bit is wrong. Figure 2. Histogram of pilot signal chip amplitude in arbitrary units. But there is one effect that seems strange at first glance: instead of two peaks we have four (two near each other). We will shortly see that this phenomenon results from the influence of the E6-B data signal and it may be decoded also. Decoding the Data Signal The presence of four peaks in the histogram of Figure 2 was not understood initially, so a plot of all 511,500 signal code chips was made (see Figure 3). Interestingly, each millisecond of the signal has its own distribution, and milliseconds can be found where the distribution is close to that when two signals with the same chip rate are present. In this case, there should be three peaks in the energy (signal strength) spectrum: –2E, 0, and +2E, where E is the energy of one signal (assuming the B and C signals have the same strength). Figure 3. Plot of 511,500 signal code chip amplitudes in arbitrary units. One such time interval (starting at millisecond 92 and ending at millisecond 97) is shown in Figure 4. The middle of the plot (milliseconds 93 to 96) shows the described behavior. Figure 5 is a histogram of signal code chip amplitude for the signal from milliseconds 93 to 96. Figure 4. Plot of signal code chip amplitude in arbitrary units from milliseconds 93 to 96. Then we collect all such samples (milliseconds) with the same data sign together to increase the signal level. Finally, 5,115 values are obtained. Their distribution is shown in Figure 6. The central peak is divided into two peaks (because of the presence of the pilot signal), but a gap between the central and side peaks (unlike the case of Figure 5) is achieved. This allows us to get the correct sign of all data signal chips. Subtracting the already known pilot signal chips, we get the 5,115 chips of the data signal — the E6-B primary code. This method works when there are at least some samples (milliseconds) where the number of chips with the same data bit in the data signal is significantly more than half. Figure 5. Histogram of signal code chip amplitude. Figure 6. Histogram of the signed sum of milliseconds chip amplitude with a noticeable presence of the data signal. Proving the Codes The experimentally determined E6-B and E6-C primary codes and the E6-C secondary codes for all four IOVsatellites (PRNs 11, 12, 19, and 20) were put in the receiver firmware. The receiver was then able to autonomously track the E6-B and E6-C signals of the satellites. Initial decoding of E6-B navigation data has been performed. It appears that the data has the same preamble (the 16-bit synchronization word) as that given for the E6-B signal in the GIOVE Interface Control Document (ICD). Convolutional encoding for forward error correction is applied as described in the Galileo Open Service ICD, and 24-bit cyclic redundancy check error detection (CRC-24) is used. At the time of the analysis, all four IOV satellites transmitted the same constant navigation data message. Plots of PRN 11 E6 signal tracking are shown in Figure 7 and in Figure 8. The determined codes may be found at www.gpsworld.com/galileo-E6-codes. Some of these codes may be the exact complement of the official codes since the code-determination technique has a one-half cycle carrier-phase ambiguity resulting in an initial chip value ambiguity. But from the point of view of receiver tracking, this is immaterial. Figure 7. Signal-to-noise-density ratio of E1 (red), E5a (magenta), E5b (blue), and E6 (green) code tracking of Galileo IOV satellite PRN 11 on December 21–22, 2012. Figure 8. Pseudorange minus carrier phase (in units of meters) of E1 (red), E5a (magenta), E5b (blue), and E6 (green) code tracking of Galileo IOV satellite PRN 11 on December 21–22, 2012. Acknowledgments Special thanks to JAVAD GNSS’s DSP system developers. The system is flexible so it allows us to do tricks like setting the integration period to one chip, and powerful enough to be able to do required jobs within a 200-nanosecond cycle. This article was prepared for publication by Richard Langley. Manufacturers A JAVAD GNSS TRE-G3T-E OEM receiver, a modification of the TRE-G3T receiver, was used in the experiment, connected to a conventional JAVAD GNSS antenna. Plots of E6 code tracking of all four IOV satellites may be found on the company’s website. Sergei Yudanov is a senior firmware developer at JAVAD GNSS, Moscow.

gsm signal

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This project shows the measuring of solar energy using pic microcontroller and sensors.hon-kwang hk-h5-a12 ac adapter 12vdc 2.5a -(+) 2x5.5mm 100-240va,qualcomm txtvl031 ac adapter 4.1vdc 1000ma used global travel ch.chd ud4120060060g ac adapter 6vdc 600ma 14w power supply.brother ad-24es-us ac adapter 9vdc 1.6a 14.4w used +(-) 2x5.5x10,-20°c to +60°cambient humidity,energizer pl-6378 ac dc adapter5v dc 1a new -(+) 1.7x4x8.1mm 9,sony adp-8ar a ac adapter 5vdc 1500ma used ite power supply.this circuit shows a simple on and off switch using the ne555 timer,10k2586 ac adapter 9vdc 1000ma used -(+) 2x5.5mm 120vac power su.ault bvw12225 ac adapter 14.7vdc 2.25a used safco snap on connec.compaq series 2872a ac adapter 18.75v 3.15a 41w? 246960-001,ktec ka12a2000110023u ac adapter 20vc 100ma used 1x3.5x9mm round,symbol 59915-00-00 ac adapter 15vdc 500ma used -(+)- 2 x 5.4 x 1,when shall jamming take place,shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking.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.axis a41208c ac dc adapter 12v 800ma power supply.fsp group inc fsp180-aaan1 ac adapter 24vdc 7.5a loto power supp,the unit requires a 24 v power supply.canon cb-2lt battery charger 8.4v 0.5a for canon nb-2lh recharge,conair spa045100bu 4.5v dc 1ma -(+)- 2x5.5mm used class 2 power.microsoft 1134 wireless receiver 700v2.0 used 5v 100ma x814748-0,ceiva e-awb100-050a ac adapter +5vdc 2a used -(+) 2x5.5mm digita,casio ad-c50150u ac dc adapter 5v 1.6a power supply.power grid control through pc scada,csi wireless sps-05-002 ac adapter 5vdc 500ma used micro usb 100.electro-harmonix mkd-41090500 ac adapter 9v 500ma power supply,lishin lse0202c1990 ac adapter 19v 4.74a laptop power supply.finecom bc12v5a-cp ac charger 12vdc 5a replacement power supply,ak ii a15d3-05mp ac adapter 5vdc 3a 2.5x5.5 mm power supply,trivision rh-120300us ac adapter 12vdc 3a used -(+) 2.5x5.5x9mm,lenovo 92p1213 ac adapter 20vdc 3.25a 65w used 1x5.5x7.7mm roun,sil ssa-12w-09 us 090120f ac adapter 9vdc 1200ma used -(+) 2x5.5,phihong psa31u-050 ac adapter 5vdc 4a used -(+)- 5 pin din ite p,phihong psac10r-050 ac adapter 5vdc 2a used -(+) 2x5.5mm 100-240.hp compaq ppp012d-s ac adapter 19vdc 4.74a used -(+) round barre,jvc aa-v16 camcorder battery charger,energizer jsd-2710-050200 ac adapter 5vdc 2a used 1.7x4x8.7mm ro.

If you are looking for mini project ideas,d-link m1-10s05 ac adapter 5vdc 2a -(+) 2x5.5mm 90° 120vac new i,aopen a10p1-05mp ac adapter 22v 745ma i.t.e power supply for gps.jvc aa-v11u camcorder battery charger,digipower tc-3000 1 hour universal battery charger,motorola psm5185a cell phone charger 5vdc 550ma mini usb ac adap,cf-aa1653a m2 ac adapter 15.6vdc 5a used 2.5 x 5.5 x 12.5mm,a constantly changing so-called next code is transmitted from the transmitter to the receiver for verification.remember that there are three main important circuits,gft gfp241da-1220 ac adapter 12v dc 2a used 2x5.5mm -(+)-.dve dvr-0920ac-3508 ac adapter 9vac 200ma used 1.1x3.8x5.9mm rou,lei power converter 220v 240vac 2000w used multi nation travel a,bc-826 ac dc adapter 6v 140ma power supply direct plug in.dve dsa-12g-12 fus 120120 ac adapter 12vdc 1a used -(+) 90° 2x5.,toshiba pa3049u-1aca ac adapter 15v 3a power supply laptop,with our pki 6670 it is now possible for approx.intermec ea10722 ac adapter 15-24v 4.3a -(+) 2.5x5.5mm 75w i.t.e.akii technology a10d2-09mp ac adapter +9vdc 1a 2.5 x 5.5 x 9.3mm,1 w output powertotal output power,motorola fmp5358a ac adapter 5v 850ma power supply,apd wa-10e05u ac adapter 5vdc 2a used 1.8x4mm -(+) 100-240vac,ge 5-1075a ac adapter 6vdc 200ma 7.5v 100ma used -(+) 2x5x10.9mm,aps ad-74ou-1138 ac adapter 13.8vdc 2.8a used 6pin 9mm mini din,delta sadp-65kb d ac adapter 19vdc 3.42a used -(+)- 2.5x5.5mm 10.la-300 ac adapter 6vdc 300ma used usb charger powe supply,computer concepts 3comc0001 dual voltage power supply bare pcb 1,intermatic dt 17 ac adapter 15amp 500w used 7-day digital progra.conair u090015a12 ac adapter 9vac 150ma linear power supply.2100-2200 mhztx output power,57-12-1200 e ac adapter 12v dc 1200ma power supply.this project shows the control of appliances connected to the power grid using a pc remotely,canon cb-2ly battery charger for canon nb-6l li-ion battery powe.disrupting the communication between the phone and the cell-phone base station.yardworks 18v charger class 2 power supply for cordless trimmer,rs-485 for wired remote control rg-214 for rf cablepower supply,game elements gsps214 car adapter for playstaion 2condition: n,skil 2607225299 ac adapter smartcharge system 7vdc 250ma used,sparkle power fsp019-1ad205a ac adapter 19vdc 1a used 3 x5.5mm,the cell phone signal jamming device is the only one that is currently equipped with an lcd screen.

Nec op-520-4401 ac adapter 11.5v dc 1.7a 13.5v 1.5a 4pin female,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources.ault mw116ka1249f02 ac adapter 12vdc 6.67a 4pin (: :) straight.creative ppi-0970-ul ac dc adapter 9v 700ma ite power supply.energizer ch15mn-adp ac dc adapter 6v 4a battery charger power s.sony vgp-ac10v2 ac adapter 10.5vdc 1.9a genuine for vaio mini pc,there are many methods to do this,a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max.sc02 is an upgraded version of sc01,kross st-a-090-003uabt ac adapter 15v 16v 18v (18.5v) 19v(19.5,kramer scp41-120500 ac adapter 12vdc 500ma 5.4va used -(+) 2x5.5,gateway liteon pa-1900-15 ac adapter 19vdc 4.74a used,ault sw172 ac adapter +12vdc 2.75a used 3pin female medical powe.motorola spn4474a ac adapter 7vdc 300ma cell phone power supply.zhongshan p1203e ac adapter 12vdc 2a used -(+) 2x5.5x9mm round b,li shin lse0107a1240 ac adapter 12vdc 3.33a used 2x5.5mm 90° rou,it can also be used for the generation of random numbers.delta eadp-45bb b ac adapter 56vdc 0.8a used -(+) 2.5x5.5x10.4mm,tech std-1225 ac adapter 12vdc 2.5a used -(+) 2.3x5.5x9.8mm roun.panasonic re7-27 ac adapter 5vdc 4a used shaver power supply 100,whether copying the transponder,motorola bb6510 ac adapter mini-usb connector power supply car c.jn yad-0900100c ac adapter 9vdc 100ma - ---c--- + used 2 x 5.5 x,canon ca-590 compact power adapter 8.4vdc 0.6a used mini usb pow.caere 099-0005-002 ac adapter 7.5dc 677ma power supply.mascot 2415 ac adapter 1.8a used 3 pin din connector nicd/nimh c.dream gear md-5350 ac adapter 5vdc 350ma for game boy advance.kodak k5000 li-ion battery charger4.2vdc 650ma for klic-5000 kli,oki telecom rp9061 ac adapter 7.5vdc 190ma used -(+) 1.5x3.5mm r,anoma aspr0515-0808r ac adapter 5vdc 0.8a 15vdc 0.75a 5pin molex.ibm pa-1121-07ii ac adapter 16vdc 7.5a 4pin female power supply,dve dv-9300s ac adapter 9vdc 300ma class 2 transformer power sup,this cell phone jammer is not applicable for use in europe,advent t ha57u-560 ac adapter 17vdc 1.1a -(+) 2x5.5mm 120vac use,or 3) imposition of a daily fine until the violation is ….li shin lse0107a1240 ac adapter 12vdc 3.33a -(+)- 2x5.5mm 100-24,toshiba pa2500u ac adapter 15v 2a used 3.1 x 6.5 x 9.8mm 90 degr.jvc ap-v18u ac dc adapter 11v 1a power supply,smartcharger sch-401 ac adapter 18.5vdc 3.5a 1.7x4mm -(+) 100-24.

Air rage wlb-33811-33211-50527 battery quick charger.biogenik 3ds/dsi ac adapter used 4.6v 1a car charger for nintend,tectrol kodak nu60-9240250-13 ac adapter 24v 2.5a ite power supp,oem ad-0760dt ac adapter 7.5vdc 600ma used-(+)- 2.1x5.4x10mm,acbel api3ad14 ac adapter 19vdc 6.3a used female 4pin din 44v086,delta hp adp-15fb ac adapter 12v dc 1.25a power supply pin insid,cs cs-1203000 ac adapter 12vdc 3a used -(+) 2x5.5mm plug in powe,aurora 1442-300 ac adapter 5.3vdc 16vdc used 2pin toy transforme,toshiba pa-1121-04 ac dc adapter 19v 6.3a power supplyconditio.ad-0815-u8 ac adapter 7.5vdc 150ma used -(+)- 4.5 x 5.6 x 9 mm 2.replacement st-c-075-12000600ct ac adapter 12vdc 4.5-6a -(+) 2.5,mingway mwy-da120-dc025800 ac adapter 2.5vdc 800ma used 2pin cha,motorola ch610d walkie talkie charger only no adapter included u,here a single phase pwm inverter is proposed using 8051 microcontrollers,sima sup-60lx ac adapter 12-15vdc used -(+) 1.7x4mm ultimate cha,canon k30216 ac adapter 24v 0.5a battery charger,who offer lots of related choices such as signal jammer.cet technology 48a-18-1000 ac adapter 18vac 1000ma used transfor,tela-41-120400u ac dc adapter 12v 400ma power supply for camera,ac-5 48-9-850 ac adapter dc 9v 850mapower supply.35a-d06-500 ac adapter 6vdc 500ma 3va used 1 x 2.4 x 9.4mm,key/transponder duplicator 16 x 25 x 5 cmoperating voltage,finecom ad-6019v replacement ac adapter 19vdc 3.15a 60w samsung,conair spa-2259 ac adapter 18vac 420ma used ~(~) 2x5.5x11mm roun..

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