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SVN49 in space (artist’s rendering). The signal anomaly from SVN 49 alerted researchers to new possibilities in analysis and monitoring. Chip Transition-Edge Based Signal Tracking for Ultra-Precise GNSS Monitoring Applications By Sanjeev Gunawardena, John Raquet and Frank van Graas Tracking GNSS signals using their underlying spreading sequence chip transition edges reveals positive versus negative chip asymmetries that are characteristic to each satellite. This asymmetry is due to various types of natural signal deformation that is known to occur within the satellite’s signal generation and transmission hardware. This novel concept of monitoring chip asymmetry can extend the state of the art in the areas of GNSS signal-quality monitoring and authentication. A technique to directly monitor chip asymmetry within a specially designed ChipShape GNSS receiver architecture employs separate code discriminators that align themselves to the chip rising-edge and falling-edge zero crossings. The detailed study of naturally-present deformations in GNSS signals is a relatively new activity that was sparked by the GPS SVN49 anomaly and the associated research activities that followed. This research area has numerous applications that include: Informing the design of sudden signal deformation detection and alerting algorithms for safety-of-life differential GNSS applications (such as aviation). GNSS signal “fingerprinting” and authentication. The detailed study of long-term degradation effects of GNSS satellite signal generation and transmission hardware. Analysis of the impact to the first item in this list of swapping a satellite’s signal generation modules by its control segment. Multipath detection, characterization, and mitigation are also closely tied to all research relating to GNSS signal deformation monitoring (SDM). High-fidelity SDM can be performed using two methods: observation of actual GNSS signals above the thermal noise floor using a high-gain dish antenna; the combination of long coherent integration and multi-correlator processing. Our previous research has revealed that these two methods are highly complementary for gaining full insight into the effects and causes of observed natural signal deformations. Among the handful of multi-correlator processing techniques that can be applied for SDM, ChipShape processing allows the correlation function resolution to be finely adjustable while providing good numerical processing efficiency. This processing technique also allows chip-transition eye diagrams to be constructed in order to provide additional insight such as positive and negative chip width asymmetries. One goal of our SDM research involves developing capabilities to observe GNSS signals with the highest levels of fidelity practically achievable in order to further the application areas described above. Key to this is developing techniques to track GNSS signals using a reference point that is both consistent and invariant (to the greatest extent possible) to nominal signal deformations and environmental effects such as multipath. Traditional multipath mitigating techniques such as narrow correlator and double-delta correlator are sub-optimal in this regard. This is because a significant portion of the signal around the chip transition point (that is, 10 percent and 20 percent for 0.1 chip correlator spacing, respectively) must be integrated to realize these discriminators and maintain robust tracking in moderate dynamics conditions. This integration tends to low-pass filter the desired observables. Chip Transition Edge-Based Code Tracking Figure 1 illustrates normalized C/A code chip rising edges for the GPS constellation of June 2014. These chip shapes were processed using a front-end with 24 MHz bandwidth. For visual comparison purposes, this and other related plots were obtained using 600 seconds of coherent integration. Figure 1. Normalized ChipShape rising edges for the GPS SPS constellation of June 2014; each color represents a different GPS satellite. The code tracking loop used to obtain this result employed an empirical normalized coherent rising-edge discriminator given by: (1) Where τ is relative code phase in chips, d is Early-Late correlator spacing,R’XYZ(i) is the differential correlation output for integer bin i obtained using ChipShape processing with masking sequence XYZ. bin(x) is a function that selects the closest ChipShape vector index that corresponds to relative code phase x. Each ChipShape processing bank is configured to span one chip early and one chip late with a resolution of N bins per chip, thus producing a ChipShape vector of 3N bins. α is a scale factor obtained through trial and error to yield robust tracking performance as observed by the code-minus-phase measurement. For the result shown in Figure 1, N=240 and d ≈ 0.017 chips. The figure clearly shows that the rising-edge zero crossings vary by SV. This variation is due to nominal signal deformation present in each GPS-SPS signal. Figure 2 illustrates the rising-edge zero crossings aligned to zero relative code phase. This alignment was performed by interpolating each R’NPN vector, precisely estimating code phase at the zero-crossing point, and shifting the curve appropriately. Figure 2. Normalized ChipShape rising edges for the GPS SPS constellation of June 2014: Zero crossing compensated. Figure 3 shows zero crossings for the falling edges after all rising edges were aligned to zero. The figure clearly illustrates subtle asymmetries between positive and negative chips which span a range of approximately ±1.5 meters. These asymmetries are not directly observable using typical GNSS receiver processing. However, they can lead to pseudorange biases through the resulting distortion that occurs to the traditional correlation function. Figure 3. Normalized ChipShape falling edges for the GPS SPS Constellation of June 2014 when rising edges are aligned to zero. In general, a family of code discriminators that precisely track chip rising-edge zero crossings can be defined by: (2) Where R’NPX is a linear combination of orthogonal ChipShape components that preserve the rising-edge transition, e.g.: R’NPX = R’NPN + R’NPP. R’FFX is a linear combination of orthogonal ChipShape components that preserve the non-transitioning (that is, flat) sections of chips, for example: R’FFX = R’PPP + R’PPN − R’NNP − R’NNN. a and b define an integration interval within the range −1 to +2 chips with respect to the chip transition edge. β is a bias compensation term. represents the real or imaginary component function for the coherent discriminator (depending on the modulation phase of the signal being tracked), or the magnitude function for a non-coherent discriminator implementation. Similarly, a family of code discriminators that precisely track chip falling-edge zero crossings that occur one chip after the rising edges tracked by the discriminator of Equation 2 can be defined by: (3) Then, a two-step technique to precisely monitor chip asymmetry can be described as follows: Setup two identical ChipShape processing channels to track a given PRN. Progressively tighten the code tracking loops to track the rising-edge zero crossings of the underlying signal using the discriminator of Equation 2. After steady-state zero-crossing rising-edge tracking is achieved, switch the second channel’s code discriminator to that of Equation 3. This will cause the second channel to track the zero crossings of the falling edges that occur one chip later in the underlying signal’s spreading sequence. The discriminator’s linear range must be wide enough to pull-in the chip asymmetry shown in Figure 3. When the second channel re-converges as a result of Step 2, the relative pseudorange displacement that occurs is equal to the chip asymmetry in meters. Hence, chip asymmetry can be monitored for the entire visible pass of a satellite. It is expected that positive and negative chip transitions are equally affected by channel distortions (that is, code and carrier multipath, ionosphere, troposphere, and the receiver antenna and front-end transfer function). Hence, the rising-edge-code-minus-falling-edge-code measure of chip asymmetry is expected to be invariant to most if not all channel distortions. Estimating Compensation Parameters As shown in Equations 2 and 3, due to natural signal deformation of many types, the rising and falling-edge zero-crossing discriminators are expected to be SV number, PRN code and elevation angle dependent. Hence, α and β must be estimated for a given correlator spacing d separately for all SV signals of the constellation. These values will also be specific to a given antenna and receiver front-end. Figure 4 illustrates the procedure used to estimate the scale factor and bias terms starting with the empirical rising-edge tracking process described above. Figure 4. Procedure for estimating scale factors and biases for rising-edge tracking early-late and double-delta code discriminators. The following figures illustrate the edge tracking discriminator calibration process using R’NPN for a single SV. Figure 5 illustrates the early-plus-late functions computed for various correlator spacings. As described previously, these functions typically do not cross through zero codephase due to natural signal deformation. Figure 5. Uncorrected rising-edge early-late discriminator functions for various correlator spacings. Figure 6 illustrates the rising-edge discriminator functions after bias compensation. Figure 6. Rising-edge early-late discriminator functions for various correlator spacings after bias compensation. Figure 7 shows the fully calibrated Early-Late rising-edge tracking code discriminators. Figure 7. Calibrated rising-edge early-late discriminator functions for various correlator spacings. Figure 8 illustrates the multipath error envelopes for the rising edge-based coherent code discriminators. The performance of these discriminators is similar to the traditional Early-Late discriminators for the same correlator spacings. This result is consistent with the theoretical bounds for code multipath. Figure 8. Multipath error envelopes for various rising edge-based coherent early-late code discriminator functions. As shown in Figure 4, the edge-tracking discriminators described in Equations 2 and 3 that are based on Early-Late bin spacings can be combined to obtain edge-tracking double-delta discriminators. Double-delta discriminators provide significantly improved multipath performance. In general, the edge-tracking double-delta discriminator for inner correlator spacing d is formed by the linear combination of two early-late edge-tracking discriminators, as follows: (4) Scale factor γ is estimated such that overall multipath error is minimized according to a given design criteria. Figure 9 illustrates the double-delta rising-edge discriminator with inner spacing of 0.017 chips. This discriminator has a pull-in range of approximately ±0.01 C/A chips. Figure 9. Rising-edge coherent double-delta code discriminator function. Inner correlator spacing is ~0.017 C/A chips. Figure 10 illustrates the non-linearity of this double-delta discriminator. Figure 10. Rising-edge coherent double-delta code discriminator function: Markers illustrate non-linearity. Figure 11 illustrates the multipath error envelope for the coherent rising-edge double-delta discriminator. Performance is consistent with a traditional second-derivative discriminator. Figure 11. Multipath error envelope for coherent rising-edge double-delta code discriminator with inner spacing of ~0.017 C/A chips. Figure 12 illustrates the performance of the various rising-edge tracking discriminators for a live-sky GPS-SPS signal (de-trended code-minus-carrier measurement). This figure clearly demonstrates robust code tracking and the multipath and noise mitigating benefit of ultra-narrow rising-edge discriminators. Figure 12. Code tracking performance for live sky data of various rising edge-based coherent early-late code discriminator functions. Conclusions An empirical chip rising edge-based tracking technique was used to observe the underlying chip shapes of live sky GPS-SPS signals at high fidelity. These results reveal positive versus negative chip asymmetries that are characteristic to each satellite. The novel concept and technique of directly monitoring chip asymmetry has potential to extend the state of the art in the areas of GNSS signal quality monitoring and authentication. Disclaimers. The views expressed in this paper are those of the authors and do not reflect the official policy or position of the United States Air Force, Department of Defense, or the United States Government. Acknowledgments. This research was supported by the Air Force Research Laboratory Sensors Directorate. The authors thank Ohio University Avionics Engineering Center for making available a cluster of high-performance computers to process the 20 TB dataset for this research, and Kadi Merbouh of Ohio University for maintaining and overseeing operation of this equipment. The ChipShape processing is an extension of the signal compression technique first published by Larry Weill and licensed by NovAtel for use in its Vision Correlator technology. This article is based on a paper presented at ION Pacific PNT 2015 in Honolulu. SANJEEV GUNAWARDENA is a research assistant professor with the Autonomy & Navigation Technology (ANT) Center at the Air Force Institute of Technology (AFIT). He earned a Ph.D. in electrical engineering from Ohio University. JOHN RAQUET is a professor of electrical engineering and the Director of the ANT Center at AFIT. He has been involved in navigation-related research for more than 25 years. FRANK VAN GRAAS is the Fritz J. and Dolores H. Russ professor of electrical engineering and principal investigator with the Avionics Engineering Center at Ohio University. He received the ION Johannes Kepler, Thurlow and Burka awards, and is a Fellow and past president of the ION.
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Ibm 02k6808 ac adapter 16vdc 3.5a used 2.6x5.5x11mm straight,cell phone jammer is an electronic device that blocks transmission of …,symbol 50-14000-241r ac adapter 12vdc 9a new ite power supply 10,50/60 hz transmitting to 12 v dcoperating time,5v/4w ac adapter 5vdc 400ma power supply,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.compaq ppp012h ac adapter 18.5vdc 4.9a -(+)- 1.8x4.7mm,creative dv-9440 ac adapter 9v 400ma power supply,rocketfish nsa6eu-050100 ac adapter 5vdc 1a used usb connector s,globtek gt-21097-5012 ac adapter 12vdc 4.17a 50w used -(+) 2.5x5,icc-5-375-8890-01 ac adapter 5vdc .75w used -(+)2x5.5mm batter,nikon mh-23 ac adapter 8.4vdc 0.9a 100-240vac battery charger po.the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days.discover our range of iot modules,sun fone actm-02 ac adapter 5vdc 2.5a used -(+)- 2 x 3.4 x 9.6 m.replacement ac adapter 19v dc 4.74a desktop power supply same as.1920 to 1980 mhzsensitivity.microsoft dpsn-10eb xbox 360 quick charge kit.li tone electronics lte24e-s2-1 12vdc 2a 24w used -(+) 2.1x5.5mm.panasonic vsk0626 ac dc adapter 4.8v 1a camera sv-av20 sv-av20u.a mobile jammer circuit is an rf transmitter.when zener diodes are operated in reverse bias at a particular voltage level,finecom i-mag 120eu-400d-1 ac adapter 12vdc 4a -(+) 1.7x4.8mm 10,ad35-03006 ac adapter 3vdc 200ma 22w i t e power supply,kings ku2b-120-0300d ac adapter 12v dc 300ma power supply,liteon pa-1750-02 ac adapter 19vdc 3.95a used 1.8 x 5.4 x 11.1 m.ault t57-182200-a010g ac adapter 18vac 2200ma used ~(~) 2x5.5mm,dve dsc-5p-01 us 50100 ac adapter 5vdc 1a used usb connector wal,biosystems 54-05-a0204 ac adapter 9vdc 1a used -(+) 2.5x5.5mm 12.nokia ac-10u ac adapter 5vdc 1200ma used micro usb cell phone ch,dawnsun efu12lr300s 120v 60hz used ceiling fan remot controler c.dell pa-2 ac adapter 20vdc 3.5a ite power supply 85391 zvc70ns20.fsp nb65 fsp065-aac ac adapter 19v dc 3.42a ibm laptop power sup,standard briefcase – approx,black & decker vpx0320 used 7.4vdc 230ma dual port battery charg.nyko aspw01 ac adapter 12.2vdc 0.48a used -(+) 2x5.5x10mm round,atc-frost fps2016 ac adapter 16vac 20va 26w used screw terminal,li shin 0317a19135 ac adapter 19vdc 7.1a used -(+) 2x5.5mm 100-2,hios cb-05 cl control box 20-30vdc 4a made in japan,shen zhen zfxpa01500090 ac adapter 9vdc 1.5a used -(+) 0.5 x 2.5.m2297p ac car adapter phone charger used 0.6x3.1x7.9cm 90°right,katana ktpr-0101 ac adapter 5vdc 2a used 1.8x4x10mm.868 – 870 mhz each per devicedimensions.d-link ams47-0501000fu ac adapter 5vdc 1a used (+)- 90° 2x5.5mm.sagemcom nbs24120200vu ac adapter 12vdc 2a used -(+) 2.5x5.5mm 9,specificationstx frequency,viewsonic adp-60wb ac adapter 12vdc 5a used -(+)- 3 x6.5mm power,navigon ac adapter 12.6vdc 800ma used 110-220v ac,hp f1279a ac adapter 12vdc 2.5a used -(+) 2x4.8mm straight,pa-1121-02hd replacement ac adapter 18.5v 6.5a laptop power supp,finecom ac adpter 9vdc 4a 100-240vac new.
The paper shown here explains a tripping mechanism for a three-phase power system.kyocera txtvl0c01 ac adapter 4.5v 1.5a travel phone charger 2235,simple mobile jammer circuit diagram.and frequency-hopping sequences,the operating range is optimised by the used technology and provides for maximum jamming efficiency,simple mobile jammer circuit diagram,apple h1300 ac adapter 7vdc 0.5a used -(+) 1.5x4.5x9.4mm round b.hp 0950-3195 ac adapter 5vdc 3a 3.3vdc 1.6a 8pin power supply,ad-0950-cs ac adapter 9vdc 500ma used -(+) 2x5.5x11mm round barr.apple design m2763 ac adapter 12vdc 750ma -(+) 2.5x5.5mm used 12.apple a1070 w008a130 ac adapter 13vdc 0.62a usb 100-240vac power.bellsouth dv-1250 ac adapter 12vdc 500ma power supply,nexxtech mu04-21120-a00s ac adapter 1.5a 12vdc used -(+)- 1.4 x,philips consumer v80093bk01 ac adapter 15vdc 280ma used direct w.power solve up03021120 ac adapter 12vdc 2.5a used 3 pin mini din.goldfar son-erik750/z520 ac car phone charger used.d-link m1-10s05 ac adapter 5vdc 2a -(+) 2x5.5mm 90° 120vac route.toshiba pa3049u-1aca ac adapter 15v 3a power supply laptop,350702002co ac adapter 7.5v dc 200ma used 2.5x5.5x11mm straight,sony acp-88 ac pack 8.5v 1a vtr 1.2a batt power adapter battery,sparkle power fsp019-1ad205a ac adapter 19vdc 1a used 3 x5.5mm,with the antenna placed on top of the car,90 % of all systems available on the market to perform this on your own.dsc ptc1620u power transformer 16.5vac 20va used screw terminal.otp sds003-1010 a ac adapter 9vdc 0.3a used 2.5 x 5.4 x 9.4 mm s.we are providing this list of projects,sony battery charger bc-trm 8.4v dc 0.3a 2-409-913-01 digital ca.koss d48-09-1200 ac adapter 9v dc 1200ma used +(-)+ 2x5.4mm 120v.lionville 7567 ac adapter 12vdc 500ma used -(+) 2x5.5mm 120vac 2,sam-1800 ac adapter 4.5-9.5vdc 1000ma used 100-240v 200ma 47-63h.sony rfu-90uc rfu adapter 5v can use with sony ccd-f33 camcorder.gsp gscu1500s012v18a ac adapter 12vdc 1.5a used -(+) 2x5.5x10mm.cwt paa050f ac adapter 12vdc 4.16a used 2.5x5.5mm -(+) 100-240va.icm06-090 ac adapter 9vdc 0.5a 6w used -(+) 2x5.5x9mm round barr,desktop 420/460pt e191049 ac dc adapter 24v 1.25a 950-302686.cyber acoustics u090100a30 ac adapter 9v ac 1000ma used 2.2 x 5.,butterfly labs ac adapter 13vdc 31a 2x 6pin pci-e bfl power supp.how to make cell phone signal jammer.kenic kd-629b ac car adapter 12-24v 1.5a used -(+) 1.1x3.5 vehic.ac dc adapter 5v 2a cellphone travel charger power supply.viasat ad8530n3l ac adapter +30vdc 2.7a used -(+) 2.5x5.5x10.3mm.potrans up04821135 ac adapter 13.5v 3.5a power supply.belkin utc001-b usb power adapter 5vdc 550ma charger power suppl.yd-001 ac adapter 5vdc 2a new 2.3x5.3x9mm straight round barrel.dell da90pe1-00 ac adapter 19.5v 4.62a used 5 x 7.4 x 17.7 mm st.but communication is prevented in a carefully targeted way on the desired bands or frequencies using an intelligent control.it was realised to completely control this unit via radio transmission,condor 41-9-1000d ac adapter 9v dc 1000ma used power supply.casio ad-c59200j ac adapter 5.9v dc 2a charger power supply.ati eadp-20fb a ac adapter 5vdc 4a -(+) 2.5x5.5mm new delta elec,sony vgp-ac19v57 19.5v dc 2a used -(+)- 4.5x6mm 90° right angle.
Mka-35090300 ac adapter 9vac 300ma used 2x5.5mm ~(~) 120vac 2.1,black & decker 680986-28 ac adapter 6.5vac 125va used power supp,cyber acoustics ka12d120050035u ac adapter 12vdc 500ma +(-) 2x5.,all mobile phones will indicate no network incoming calls are blocked as if the mobile phone were off,motorola psm5091a ac adapter 6.25vdc 350ma power supply,siemens 69873 s1 ac adapter optiset rolm optiset e power supply.this system considers two factors,lenovo pa-1900-171 ac adapter 20vdc 4.5a -(+) 5.5x7.9mm tip 100-,it has the power-line data communication circuit and uses ac power line to send operational status and to receive necessary control signals,cisco systems 34-0912-01 ac adaptser 5vdc 2.5a power upply adsl,358 358 ac adapter 4.5v-9.5vdc 800ma used 1x3.5x8.4mm straight,ktec ka12d090120046u ac adapter 9vdc 1200ma used 2 x 5.4 x 14.2.audiovox cnr505 ac adapter 7vdc 700ma used 1 x 2.4 x 9.5mm.philips 4203 030 77990 ac adapter 1.6v dc 80ma charger,kodak k5000 li-ion battery charger4.2vdc 650ma for klic-5000 kli,ps120v15-d ac adapter 12vdc 1.25a used2x5.5mm -(+) straight ro,du-bro kwik-klip iii ac adapter 1.5vdc 125ma power supply.car charger 2x5.5x12.7mm round barrel,basically it is an electronic countermeasure device,delta adp-12ub ac adapter 30vdc 0.4a dld010428 14d0300 power sup,leinu70-1120520 ac adapter 12vdc 5.2a ite power supply desktop.smoke detector alarm circuit,hi capacity san0902n01 ac adapter 15-20v 5a -(+)- 3x6.5mm used 9.they go into avalanche made which results into random current flow and hence a noisy signal,samsung skp0501000p usb ac dc adapter for mp3 ya-ad200,2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w.delta eadp-10bb ac adapter 5vdc 2000ma used -(+)- 2 x 4 x 10 mm.hewlett packard series ppp009h 18.5v dc 3.5a 65w -(+)- 1.8x4.7mm.hh-tag 5-11v dc used travel charger power supply phone connector,muld3503400 ac adapter 3vdc 400ma used -(+) 0.5x2.3x9.9mm 90° ro,vertex nc-77c two way radio charger with kw-1207 ac adapter 12v,circuit-test ad-1280 ac adapter 12v dc 800ma new 9pin db9 female.chd scp0501500p ac adapter 5vdc 1500ma used -(+) 2x5.5x10mm roun.ultech ut-9092 ac adapter 9vdc 1800ma used -(+) 1.5x4mm 100-240v,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.this was done with the aid of the multi meter,the designed jammer was successful in jamming the three carriers in india,.
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