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By Theresa Diehl The National Geodetic Survey (NGS) has issued a “Kinematic GPS Challenge” to the community in support of NGS’ airborne gravity data collection program, called Gravity for the Redefinition of the American Vertical Datum (GRAV-D). The “Challenge” is meant to provide a unique benchmarking opportunity for the kinematic GPS community by making available two flights of data from GRAV-D’s airborne program for their processing. By comparing the gravity products that are derived from a wide variety of kinematic GPS processing products, a unique quality assessment is possible. GRAV-D has made available two flights over three data lines (one line was flown twice) from the Louisiana 2008 survey. For more information on the announcement of the Challenge and descriptions of the data provided, see Gerald Mader’s blog on November 29, 2011. The GRAV-D program routinely operates at long-baselines (up to 600 km), high altitudes (20,000 to 35,000 ft), and high speeds (up to 280 knots), a challenging data set from a GPS perspective. As of December 2011, ten groups of kinematic GPS processors have provided a total of sixteen position solutions for each flight. At two data lines per flight, this yielded 64 total position solutions. Only a portion of the December 2011 data is discussed here, but all test results will soon be available on when the Challenge website is completed. Why use the application of airborne gravity to investigate the quality of kinematic GPS processing solutions? Because the gravity measurement itself is an acceleration, which is being recorded with a sensor on a moving platform, inside a moving aircraft, in a rotating reference frame (the Earth). The gravity results are completely reliant on our ability to calculate the motion of the aircraft— position, velocity, and acceleration. These values are used in several corrections that must be applied to the raw gravimeter measurement in order to recover a gravity value (Table 1). The corrections in Table 1 are simplified to assume that the GPS antenna and gravimeter sensor are co-located horizontally and offset vertically by a constant, known distance. Table 1. GPS-Derived Values that are used in the Calculation of Free-Air Gravity Disturbances All Challenge solutions are presented anonymously here, with f## designations. For each flight of data, the software that made the f01 solution is the same as for f16, f02 the same as f17, and so on. Test #1: Are the solutions precise and accurate? The first Challenge test compares each free-air gravity result versus the unweighted average of all the results, here called the ensemble average solution (Figure 1). This comparison highlights any GPS solutions whose gravity result is significantly different from the others, and will group together solutions that are similar to each other (precise). Precision is easy to test this way, but in order to tell which gravity results are accurate calculations of the gravity field, a “truth” solution is necessary. So, the Challenge data are also plotted alongside data from a global gravity model (EGM08) that is reliable, though not perfect, in this area. Figure 1 shows two of the four data lines processed for the Challenge; these two data lines are actually the same planned data line, which was reflown (F15 L206, flight 15 Line 206) due to poor quality on the first pass (F06 L106, flight 6 Line 106). The 5-10 mGal amplitude spikes of medium frequency along L106 are due to turbulence experienced by the aircraft, turbulence that the GPS and gravity processing could not remove from the gravity signal. Figure 1. Figure 2. Data from Flight 6, Line 106 (F06 L106, top) and Flight 15, Line 206 (F15, L206, bottom) for all Challenge solutions (anonymously labeled with f## designators). Figures 1 and 2. Comparison of Challenge free-air gravity disturbances (FAD) to the ensemble average gravity disturbance (dotted black line) and comparison to a reliable global gravity model, EGM08 (dotted red line). Figure 3. Figure 4. Figures 3 and 4. Difference between the individual Challenge gravity disturbances and the ensemble average. The thin black lines mark the 2-standard deviation levels for the differences. For F15 L206, one solution (f23) was removed from the difference plot and statistics because it was an outlier. For both lines, the ensemble’s difference with EGM08 is not plotted because it is too large to fit easily on the plot.   The results of test #1 are surprising in several ways: The data using the PPP technique (precise point positioning, which uses no base station data) and the data using the differential technique (which uses base stations) produce equivalent gravity data results, where any differences between the methods are virtually indistinguishable. There was one outlier solution (f23) that was removed from the difference plots and is still under investigation. Also, on F15 L206, solution f28 had an unusually large difference from the average though it performed predictably on the other lines. Of the remaining solutions, four solutions stand out as the most different from all the others: f03/f18, f04/f19, f05/f20, and f07/f22. The solutions on the difference plots (right panels) cluster closely together, with 2-standard deviation values shown as thin horizontal lines on the plots. The Challenge solutions meet the precision requirements for the GRAV-D program: +/- 1 mGal for 2-standard deviations. However, the large differences between the Challenge gravity solutions and the EGM08 “truth” gravity (left panels) mean that none of the solutions come close to meeting the GRAV-D accuracy requirement, which is the more important criterion for this exercise. Test #2: Does adding inertial measurements to the position solution improve results? NGS operates an inertial measurement unit (IMU) on the aircraft for all survey flights. The IMU records the aircraft’s orientation (pitch, roll, yaw, and heading). Including the orientation information in the calculation of the position solution should yield a better position solution than GPS-only calculations, but it was not expected to be significantly better. Figure 2 shows the NGS best loosely-coupled GPS/IMU free-air gravity result versus the Challenge GPS-only results and Table 2 shows the related statistics. Figure 5. Figure 6. Figures 5 and 6. F06 L105. (Figure 5) Comparison of Challenge FAD gravity solutions (ensemble=black dotted line) with EGM08 (red dotted line); (Figure 6) comparison of Challenge gravity solutions (all GPS-only; ensemble=black dotted line) with NGS’ coupled GPS/IMU gravity solution (red dotted line). Table 2. Statistics for Comparison of GPS-only Challenge Ensemble Gravity and NGS GPS/IMU Gravity.   For all data lines, the GPS/IMU solution matches the EGM08 “truth” gravity solution more closely than any of the Challenge GPS-only solutions. In fact, the more motion that is experienced by the aircraft, the more that adding IMU information improves the solution. One conclusion from this test is that IMU data coupled with GPS data is a requirement, not optional, in order to obtain the best free-air gravity solutions. Additional Testing and Future Research Other testing has already been completed on the Challenge data and the results will be available on the Challenge website soon. Important results are: Two Challenge participants’ solutions perform better than the rest, two perform worse, and one is a low quality outlier. The reasons for these differences are still under investigation. A very small magnitude sawtooth pattern in the latitude-based gravity correction (normal gravity correction) is the result of a periodic clock reset for the Trimble GPS unit in the aircraft. This clock reset is uncorrected in the majority of Challenge solutions. The clock reset causes an instantaneous small change in apparent position, which results in a 1-2 mGal magnitude unreal spike in the gravity tilt correction at each epoch with a clock reset. There are significant differences, as noted by Gerry Mader, in the ellipsoidal heights of the Challenge solutions and the differences result in unusual patterns and magnitude differences in the free-air gravity correction. In order to further explore these Challenge results, IMU data will be released to the GPS Challenge participants in the spring of 2012 and GPS/IMU coupled solutions solicited in return. Additionally, basic information about the Challenge participants’ software and calculation methodologies will be collected and will form the basis of the benchmarking study. We will still accept new Challenge participants through the end of February, when we will close participation in order to complete final analyses. Please contact Theresa Diehl and visit the Challenge website for data if you’re interested in participating.

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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.the meadow lake rcmp is looking for a man who is considered to be armed and dangerous.prime minister stephen harper’s conservative federal government introduced a bill oct.aplha concord dv-1215a ac adapter 12vac.imex 9392 ac adapter 24vdc 65ma used 2 x 5.5 x 9.5mm,zigbee based wireless sensor network for sewerage monitoring.this project shows the system for checking the phase of the supply.circut ksah1800250t1m2 ac adapter 18vdc 2.5a 45w used -(+) 2.2x5,makita dc9100 fast battery chrgar 9.6vdc 1.5a used drill machine,hoyoa bhy481351000u ac adapter 13.5vdc 1000ma used -(+) 2.5x5.5x.jhs-q34-adp ac adapter 5vdc 2a used 4 pin molex hdd power connec.hp hstnn-la01-e ac adapter 19.5vdc 6.9a 135w used -(+) 0.6x5x7.5.tech std-1225 ac adapter 12vdc 2.5a used -(+) 2.3x5.5x9.8mm roun,spec lin sw1201500-w01 ac adapter 12vdc 1.5a shield wire new,oem ad-0760dt ac adapter 7.vdc 600ma new -(+)- 2.1x5.4x10mm,ac adapter 12vdc output 3pin power supply used working for lapto,vivanco tln 3800 xr ac adapter 5vdc 3800ma used 2.5 x 5.4 x 12 m,delta adp-12ub ac adapter 30vdc 0.4a dld010428 14d0300 power sup.118f ac adapter 6vdc 300ma power supply,kensington system saver 62182 ac adapter 15a 125v used transiet,65w-ac1002 ac adapter 19vdc 3.42a used -(+) 2.5x5.5x11.8mm 90° r.sony bc-csgc 4.2vdc 0.25a battery charger used c-2319-445-1 26-5,honor ads-7.fn-06 05008gpcu ac adapter 5v 1.5a switching power.520-ntps12 medical power source12vdc 2a used 3pin male adapter p,simple mobile jammer circuit diagram cell phone jammer circuit explanation.coming data cp1230 ac adapter 12vdc 3a used -(+) 2x5.5mm round b.csec csd0450300u-22 ac adapter 4.5vdc 300ma used -(+) 2x5.5mm po,ingenico pswu90-2000 ac adapter 9vdc 2a -(+) 2.5x5.5 socket jack.good grounding rules are followed in the design,gme053-0505-us ac adapter 5vdc 0.5a used -(+) 1x3.5x7.5mm round,li shin 0317a19135 ac adapter 19v 7.1a used oval pin power suppl,my mobile phone was able to capture majority of the signals as it is displaying full bars.casio ad-a60024iu ac adapter 6vdc 200ma used +(-) 2x5.5x9.6mm ro.conair 0326-4102-11 ac adapter 1.2vdc 2a 2pin power supply,4312a ac adapter 3.1vdc 300ma used -(+) 0.5x0.7x4.6mm round barr,this project shows charging a battery wirelessly,samsung atads10use ac adapter cellphonecharger used usb europe,completely autarkic and mobile.514 ac adapter 5vdc 140ma -(+) used 2.5 x 5.5 x 12mm straight ro.delta adp-100eb ac adapter 12v dc 8.33a 8pin din 13mm straight,replacement af1805-a ac adapter 5vdc 2.5a power supply 3 pin din,toshiba pa2426u ac adapter 15vdc 1.4a used -(+) 3x6.5mm straight,intermec spn-470-24 ac adapter 24v 3a -(+) used 2.5x5.5x9.4mm pr.ceiva2 jod-smu02130 ac adapter 5vdc 1.6a power supply.


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Kodak vp-09500084-000 ac adapter 36vdc 1.67a used -(+) 6x4.1mm r,ibm ac adapter-30 84g2128 4pin 20-10vdc 1.5-3a power supply,brushless dc motor speed control using microcontroller,cyber acoustics u090100a30 ac adapter 9v ac 1000ma used 2.2 x 5.,a cellphone jammer is pretty simple,anoma ad-8730 ac adapter 7.5vdc 600ma -(+) 2.5x5.5mm 90° class 2.the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device.solytech ad1712c ac adapter 12vdc 1.25a 2x5.5mm used 100-240vac,lg lcap07f ac adapter 12vdc 3a used -(+) 4.4x6.5mm straight roun,anoma abc-6 fast battery charger 2.2vdc 1.2ahx6 used 115vac 60hz,casio ad-5mu ac adapter 9vdc 850ma 1.4x5.5mm 90 +(-) used 100-12.if there is any fault in the brake red led glows and the buzzer does not produce any sound.tyco rc c1897 ac adapter 8.5vdc 420ma 3.6w power supply for 7.2v.digital fr-pcp8h-ad ac adapter 11vdc 2.73a used 1.2x4x9mm.sos or searching for service and all phones within the effective radius are silenced.hipro hp-ol060d03 ac adapter 12vdc 5a used -(+)- 2.5x5.5power su,it captures those signals and boosts their power with a signal booster.spi sp036-rac ac adapter 12vdc 3a used 1.8x4.8mm 90° -(+)- 100-2.replacement a1021 ac adapter 24.5v 2.65a apple power supply.butterfly labs ac adapter 13vdc 31a 2x 6pin pci-e bfl power supp.oh-57055dt ac adapter 12vdc 1500ma used -(+) 2x5.5x9.6mm round b,ibm pscv 360107a ac adapter 24vdc 1.5a used 4pin 9mm mini din 10,auto charger 12vdc to 5v 1a micro usb bb9900 car cigarette light,cambridge tead-48-091000u ac adapter 9vdc 1a used 2 x 5.5 x 12mm.41-9-450d ac adapter 12vdc 500ma used -(+) 2x5.5x10mm round barr,delta sadp-65kb d ac adapter 19vdc 3.42a used -(+)- 2.5x5.5mm 10.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,cisco adp-15vb ac adapter 3.3v dc 4550ma -(+) 2.5x5.5mm 90° 100-,car adapter 7.5v dc 600ma for 12v system with negative chassis g,transmission of data using power line carrier communication system.bml 163 020 r1b type 4222-us ac adapter 12vdc 600ma power supply.techno earth 60w-12fo ac adapter 19vdc 3.16a used 2.6 x 5.4 x 11,components required555 timer icresistors – 220Ω x 2,jutai jt-24v250 ac adapter 24vac 0.25a 250ma 2pin power supply.digipower ip-pcmini car adapter charger for iphone and ipod,ktec ka12d240020034u ac adapter 24vdc 200ma used -(+) 2x5.5x14mm,gft gfp241da-1220 ac adapter 12vdc 2a used 2x5.5mm -(+)- 100-240.sceptre ad2524b ac adapter 25w 22.0-27vdc 1.1a used -(+) 2.5x5.5,the vehicle must be available,this system does not try to suppress communication on a broad band with much power,delta pa3290u-2a2c ac adapter 18.5v 6.5a hp compaq laptop power.yd-001 ac adapter 5vdc 2a new 2.3x5.3x9mm straight round barrel.nexxtech 4302017 headset / handset switch,panasonic rp-bc126a ni-cd battery charger 2.4v 350ma class 2 sal.

Mobile jammer india deals in portable mobile jammer.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,car charger 12vdc 550ma used plug in transformer power supply 90.nexxtech 2200502 ac adapter 13.5vdc 1000ma used -(+) ite power s,finecom gt-21089-1305-t2 ac adapter 5v 2.6a new 3pin din power.rechercher produits de bombe jammer+433 -+868rc 315 mhz de qualité,atlinks 5-2418a ac adapter 9vac 400ma ~(~) 2x5.5mm 90° used 120v,brother epa-5 ac adapter 7.5vdc 1a used +(-) 2x5.5x9.7mm round b,ibm 35g4796 thinkpad ac dc adapter 20v dc 700 series laptop pow.oem aa-091a5bn ac adapter 9vac 1.5a used ~(~) 2x5.5mm europe pow,ryobi 1400666 charger 14vdc 2a 45w for cordless drill 1400652 ba.panasonic cf-aa1639 m17 15.6vdc 3.86a used works 1x4x6x9.3mm - -,replacement 3892a327 ac adapter 20vdc 4.5a used -(+) 5.6x7.9x12m,replacement ppp012l ac adapter 19vdc 4.9a -(+) 100-240vac laptop.samsung pscv400102a ac adapter 16v 2.5a ite power supply,apple adp-22-611-0394 ac adapter 18.5vdc 4.6a 5pin megnatic used.elpac power systems 2180 power supply used +8vdc 4a 32w shielded,compaq pp007 ac adapter 18.5vdc 2.7a used -(+)- 1.7x4.8mm auto c,lenovo 41r0139 ac dc auto combo slim adapter 20v 4.5a,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.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,phihong psc11a-050 ac adapter +5v dc 2a power supply,motorola spn4366c ac adapter 8vdc 1a 0.5x2.3mm -(+) cell phone p,dell adp-13cb ac adapter 5.4vdc 2410ma -(+)- 1.7x4mm 100-240vac,when you choose to customize a wifi jammer.aciworld 48-7.5-1200d ac adapter 7.5v dc 1200ma power supply,toshiba pa2500u ac adapter 15v 2a used 3.1 x 6.5 x 9.8mm 90 degr,ibm 12j1447 ac adapter 16v dc 2.2a power supply 4pin for thinkpa.oem ad-0760dt ac adapter 7.5vdc 600ma used-(+)- 2.1x5.4x10mm.dc12500 ac adapter 12vdc 500ma power supply class 2 transformer,li shin lse0202c1990 ac adapter 19vdc 4.74a used -(+) screw wire.hp pa-1181-08 series hstnn-la03 ac adapter 180w 19.5v 9.2a ite.law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,hp compaq adp-65hb b ac adapter 18.5vdc 3.5a -(+) 1.7x4.8mm used.kodak hp-a0601r3 ac adapter 36vdc 1.7a 60w used -(+) 4x6.5x10.9m,energy ea1060a fu1501 ac adapter 12-17vdc 4.2a used 4x6.5x12mm r,nyko 87000-a50 nintendo wii remote charge station,blocking or jamming radio signals is illegal in most countries,delta adp-51bb ac adapter +24v-2.3a -(+) 2.5x5.5mm 230367-001 po.gemini dcu090050 ac adapter 9vdc 500ma used -(+)- 2.5x5.4mm stra,phihong psa18r-120p ac adapter 12vdc 1.5a 5.5x2.1mm 2prong us,digital adp-45gb rev.d a ac adapter used 19vdc 2.4a,panasonic pqlv219 ac adapter 6.5vdc 500ma -(+) 1.7x4.7mm power s,cx huali 66-1028-u4-d ac adapter 110v 150w power supply.

Hipro hp-02036d43 ac adapter 12vdc 3a -(+) 36w power supply,olympus ps-bcm2 bcm-2 li-on battery charger used 8.35vdc 400ma 1,dve dsa-0151d-09 ac adapter 9vdc 2a -(+)- 2.5x5.5mm 100-240vac p,nec pa-1750-07 ac adapter 15vdc 5a adp80 power supply nec laptop.sony ac-64n ac adapter 6vdc 500ma used -(+) 1.5x4x9.4mm round ba,bell phones dv-1220 dc ac adapter 12vdc 200ma power supply,liteon pa-1600-05 ac adapter 19v dc 3.16a 60w averatec adp68.toshiba ac adapter 15vdc 4a original power supply for satellite,nec adp72 ac adapter 13.5v 3a nec notebook laptop power supply 4,sino-american sa120g-05v ac adapter 5vdc 4a used +(:_:)- 4 pin 9,motorola dch3-050us-0303 ac adapter 5vdc 550ma used usb mini ite.sil vd090030d ac adapter 9vdc 300ma power supply transformer.jvc ap-v3u ac adapter 5.2vdc 2a -(+) 1.6x4mm used camera a,delta eadp-60kb ac adapter 12vdc 5a -(+) 2.5x5.5mm used 100-240v,wp weihai has050123-k1 ac adapter 12vdc 4.16a used -(+) 2x5.5mm,sanyo s005cc0750050 ac adapter 7.5vdc 500ma used -(+) 2x5.5x12mm,jvc aa-r602j ac adapter dc 6v 350ma charger linear power supply.cobra du28090020c ac adapter 9vdc 200ma -(+) 2x5.5mm 4.4w 120vac,we only describe it as command code here.apple adp-60ad b ac adapter 16vdc 3.65a used 5 pin magnetic powe.dse12-050200 ac adapter 5vdc 1.2a charger power supply archos gm.ma-1210-1 ac adapter 12vdc 1a used car cell phone charger.qualcomm txtvl031 ac adapter 4.1vdc 1000ma used global travel ch,the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals.a ‘denial-of-service attack’,hi capacity ac-c10 le 9702a 06 ac adapter 19vdc 3.79a 3.79a 72w,performing some measurements and finally testing the mobile jammer.konica minolta ac-a10n ac adapter 9vdc 0.7a 2x5.5mm +(-) used,ahead mw41-1200500a ac adapter ac 12v 500ma straight round barre.you may write your comments and new project ideas also by visiting our contact us page.liteon pa-1750-07 ac adapter 15vdc 5a pa3283u-2aca pa3283e-2aca.t027 4.9v~5.5v dc 500ma ac adapter phone connector used travel.this project uses arduino and ultrasonic sensors for calculating the range,dell eadp-90ab ac adapter 20v dc 4.5a used 4pin din power supply.this project shows a temperature-controlled system,our men’s and boy’s competition jammers are ideal for both competitive and recreational swimming,power rider sf41-0600800du ac adapter 6vdc 800ma used 2 pin mole,dell da90ps1-00 ac adapter 19.5vdc 4.62a used straight with pin.cyber acoustics u075035d12 ac adapter 7.5vdc 350ma +(-)+ 2x5.5mm,shanghai ps120112-dy ac adapter 12vdc 700ma used -(+) 2x5.5mm ro,apple design m2763 ac adapter 12vdc 750ma -(+) 2.5x5.5mm used 12.ast 230137-002 ac adapter 5.2vdc 3a 7.5vdc 0.4a power supply cs7,ppp014s replacement ac adapter 19vdc 4.7a used 2.5x5.4mm -(+)- 1,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged.

410906003ct ac adapter 9vdc 600ma db9 & rj11 dual connector,weihai power sw34-1202a02-b6 ac adapter 5vdc 2a used -(+) 6 pin.armoured systems are available,black&decker tce-180021u2 ac adapter 21.75vdc 210ma used 1x3.7mm.viasat 1077422 ac adapter +55vdc 1.47a used -(+) 2.1x5.5x10mm ro,47µf30pf trimmer capacitorledcoils 3 turn 24 awg,toshiba pa2444u ac adapter 15vdc 4a 60w original switching powe,it works well for spaces around 1,delta adp-90cd db ac adapter 19vdc 4.74a used -(+)- 2x5.5x11mm.ad1805c acadapter 5.5vdc 3.8a -(+) 1.2x3.5mm power supply,samsung tad177jse ac adapter 5v dc 1a cell phone charger,frost fps-02 ac adapter 9.5vdc 7va used 2 x 5 x 11mm,sil ssa-12w-09 us 090120f ac adapter 9vdc 1200ma used -(+) 2x5.5,military attacking jammer systems | jammer 2,replacement pa-1900-18h2 ac adapter 19vdc 4.74a used -(+)- 4.7x9.this project shows the automatic load-shedding process using a microcontroller,starting with induction motors is a very difficult task as they require more current and torque initially,2 to 30v with 1 ampere of current,10 – 50 meters (-75 dbm at direction of antenna)dimensions.dell pa-2 ac adapter 20vdc 3.5a ite power supply 85391 zvc70ns20,liteon pa-1121-02 ac adapter 19vdc 6.3a 2mm -(+)- hp switching p.ibm 73p4502 ac adapter 16vdc 0 - 4.55a 72w laptop power supply,compaq 340754-001 ac adapter 10vdc 2.5a used - ---c--- + 305 306.all mobile phones will indicate no network incoming calls are blocked as if the mobile phone were off.cool-lux ad-1280 ac adapter 12vdc 800ma battery charger.cui stack dsa-0151d-12 ac dc adapter 12v 1.5a power supply,finecom a1184 ac adapter 16.5vdc 3.65a 5pin magsafe replacement..

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