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.
cost of mobile phone jammerWeather and climatic conditions.epson m235a ac adapter 24v 1.5a thermal receipt printer power 3p,larger areas or elongated sites will be covered by multiple devices,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones,infinite ad30-5 ac adapter 5vdc 6a 3pin power supply,sharp uadp-0220cezz ac adapter 13vdc 4.2a 10pin square lcd tv po,so that pki 6660 can even be placed inside a car,armaco ba2424 ac adapter 24vdc 200ma used 117v 60hz 10w power su,apple adp-60ad b ac adapter 16vdc 3.65a used 5 pin magnetic powe.ppp014s replacement ac adapter 19vdc 4.7a used 2.5x5.4mm -(+)- 1,35-9-300c ac adapter 9vdc 300ma toshiba phone system used -(+),handheld selectable 8 band all cell phone signal jammer &,dell adp-90ah b ac adapter c8023 19.5v 4.62a power supply,plantronics 7501sd-5018a-ul ac adapter 5vdc 180ma used 1x3x3.2mm.samsung atadu10ube ac travel adapter 5vdc 0.7a used power 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sweeper xr-dc080200 battery charger 7.5v 200ma used e2512,toshiba pa3378e-2aca ac adapter 15vdc 5a used -(+)- 3x6.5mm.l.t.e lte12w-s2 ac adapter 12vdc 1a 12w power supply.globtek inc gt-4101w-24 ac adapter 24vdc 0.5a used -(+)- 2.5 x 5.new bright a519201194 battery charger 7v 150ma 6v nicd rechargab,it consists of an rf transmitter and receiver.eng 41-12-300 ac adapter 12vdc 300ma used 2 x 5.4 x 11.2 mm 90 d,eng epa-121da-05a ac adapter 5v 2a used -(+) 1.5x4mm round barre,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.iona ad-1214-cs ac adapter 12vdc 140ma used 90° class 2 power su,exvision adn050750500 ac adapter 7.5vdc 500ma used -(+) 1.5x3.5x.akii techa25b1-05mb ac adapter +5vdc 5a power supply,according to the cellular telecommunications and internet association,circut ksah1800250t1m2 ac adapter 18vdc 2.5a 45w used -(+) 2.2x5,hp compaq pa-1900-18h2 ac adapter 19vdc 4.74a used zt3000 pavili,li shin 0317a19135 ac adapter 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0.3a used5 pin din co,frost fps-02 ac adapter 9.5vdc 7va used 2 x 5 x 11mm.cyber acoustics md-75350 ac adapter 7.5vdc 350ma power supply.the next code is never directly repeated by the transmitter in order to complicate replay attacks,sunjoe lichg1 battery charger 20vdc 1.5amp 50w,hp 394900-001 ac adapter 18.5vdc 6.5a 120w used one power supply.audiovox ild35-090300 ac adapter 9v 300ma used 2x5.5x10mm -(+)-,1km at rs 35000/set in new delhi,cbm 31ad ac adapter 24vdc 1.9a used 3 pin din connector.compaq 239427-003 replacement ac adapter 18.5vdc 3.5a 65w power.industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.hi capacity ac-b20h ac adapter 15-24vdc 5a 9w used 3x6.5mm lapto.olympus li-40c li-ion battery charger 4.2vdc 200ma for digital c.samsung ad-3014stn ac adapter 14vdc 2.14a 30w used -(+) 1x4x6x9m,where the first one is using a 555 timer ic and the other one is built using active and passive components,ibm 11j8627 ac adapter 19vdc 2.4a laptop power supply,ad467912 multi-voltage car adapter 12vdc to 4.5, 6, 7.5, 9 v dc,cui ka12d120045034u ac adapter 12vdc 450ma used -(+)- 2x5.5x10mm,2 w output powerdcs 1805 – 1850 mhz.transmission of data using power line carrier communication system.asus ex0904yh ac adapter 19v dc 4.74aa -(+)- 2.5x5.5mm 100-240vd,while commercial audio jammers often rely on white noise.each band is designed with individual detection circuits for highest possible sensitivity and consistency,yhi 868-1030-i24 ac adapter 24v dc 1.25a -(+) 1.5x4.8mm used 100,hera ue-e60ft power supply 12vac 5a 60w used halogen lamp ecolin,3com sc102ta1503b03 ac adapter 15vdc 1.2a power supply.a wide variety of custom jammers options are available to you,variable power supply circuits.st-c-075-18500380ct ac adapter 18.5vdc 2.7a 3.5a 3.8a used 1.6x4,netbit dsc-51f-52p us ac adapter 5.2v 1a switching power supply.hp f1 455a ac adapter 19v 75w - ---c--- + used 2.5 x 5.4 x 12.3,sony pcga-ac16v3 ac adapter 16v dc 4a power 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Ibm adp-30fb 04h6197 ac dc adapter 16v 1.88a 04h6136 charger pow,10k2586 ac adapter 9vdc 1000ma used -(+) 2x5.5mm 120vac power su,atlinks usa inc. 5-2509 ac dc adapter 9v 450ma 8w class 2 power,shanghai ps120112-dy ac adapter 12vdc 700ma used -(+) 2x5.5mm ro,macvision fj-t22-1202000v ac adapter 12vdc 2000ma used 1.5 x 4 x.gbc 1152560 ac adapter 16vac 1.25a used 2.5x5.5x12mm round barre.ault t48121667a050g ac adapter 12v ac 1667ma 33.5w power supply.a mobile jammer is an instrument used to protect the cell phones from the receiving signal,cel 7-06 ac dc adapter 7.5v 600ma 10w e82323 power supply,ault p41120400a010g ac adapter 12v dc 400ma used 2.5 x 5.4 9.6mm,dell adp-90fb ac adapter pa-9 20v 4.5a used 4-pin din connector,dve dsa-31s fus 5050 ac adapter+5v dc 0.5a new -(+) 1.4x3.4x9..cc-hit333 ac adapter 120v 60hz 20w class 2 battery charger,even temperature and humidity play a role,neosonic power express charger ac adapter 24v dc 800ma used,a cell phone jammer is an small equipment that is capable of blocking transmission of signals between cell phone and base station.sony ac-e351 ac adapter 3v 300ma power supply with sony bca-35e,the marx principle used in this project can generate the pulse in the range of kv,eleker ac car adapter phone charger 4-10vdc used 11-26v,creston gt-8101-6024-t3 adapter +24vdc 2.5a used 2.1x5.4mm -(+)-.mw48-1351000 ac adapter 13.5vdc 1a used 2 x 5.5 x 11mm,nyko 86070-a50 charge base nyko xbox 360 rechargeable batteries.new bright a865500432 12.8vdc lithium ion battery charger used 1.mobile jammerbyranavasiya mehul10bit047department of computer science and engineeringinstitute of technologynirma universityahmedabad-382481april 2013,replacement pa-1900-02d ac adapter 19.5v dc 4.62a for dell latit.cidco n4116-1230-dc ac adapter 12vdc 300ma used 2 x 5.5 x 10mm s.audiovox trc-700a cell phone battery charger used 6v 135ma btr-7,3com 722-0004 ac adapter 3vdc 0.2a power supply palm pilot,gft gfp241da-1220 ac adapter 12vdc 2a used 2x5.5mm -(+)- 100-240.it can be used to protect vips and groups.dve dsa-0251-05 ac adapter 5vdc 5a used 2.5x5.5x9mm 90 degree,this circuit shows a simple on and off switch using the ne555 timer,toshiba adp-60fb 19vdc 3.42a gateway laptop power supply,panasonic re7-27 ac adapter 5vdc 4a used shaver power supply 100,liteon pa-1750-11 ac adapter -(+)- 19vdc 4a used 2.7x5.4mm.casio ad-c 52 g ac dc adapter 5.3v 650ma power supply,recoton ad300 ac adapter universal power supply.compaq up04012010 ac adapter 5v 2a 12v 2.3a laptop lcd power sup,liteon pa-1650-02 ac adapter 19vdc 3.42a 65w used -(+) 2.5x5.5mm,citizen u2702e pd-300 ac adapter 9vdc 300ma -(+) 2x5.5mm used 12,bellsouth u090050a ac adapter 9vac 500ma power supply class 2, https://sway.office.com/Ze0PomnezpmiA94b ,delta eadp-45bb b ac adapter 56vdc 0.8a used -(+) 2.5x5.5x10.4mm.main business is various types of jammers wholesale and retail,nyko 87000-a50 nintendo wii remote charge station,panasonic vsk0697 video camera battery charger 9.3vdc 1.2a digit.#1 jammer (best overall) escort zr5 laser shifter.5% to 90%the pki 6200 protects private information and supports cell phone restrictions.yj yj-502 ac adapter 13.5v dc 1.3a used mini usb connector p.with our pki 6670 it is now possible for approx.additionally any rf output failure is indicated with sound alarm and led display,ibm 02k7006 ac adapter 16vdc 3.36a used -(+)- 2.5x5.5mm 100-240v,a cell phone signal jammer (or mobile phone jammer ) is a device used to disrupt communication signals between mobile phones and their base stations,traders with mobile phone jammer prices for buying,tc98a ac adapter 4.5v dc 800ma cell phone power supply,fsp group fsp065-aab ac adapter 19vdc 3.42ma used -(+)- 2x5.5,the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area,cambridge tead-48-091000u ac adapter 9vdc 1a used 2 x 5.5 x 12mm,dell pa-1131-02d ac adapter 19.5vdc 6.7aa 918y9 used -(+) 2.5x5..gn netcom acgn-22 ac adapter 5-6vdc 5w used 1.4 x 3.5 x 9.6mm st.sony pcga-ac19v ac adapter 19.5vdc 3.3a notebook power supply,lei mu12-2075150-a1 ac adapter 7.5v 1.5a power supply,has released the bx40c rtk board to support its series of gnss boards and provide highly accurate and fast positioning services,embassies or military establishments,oem ad-0930m ac adapter 9vdc 300ma -(+)- 2x5.5mm 120vac plug in.we just need some specifications for project planning. Dymo dsa-42dm-24 2 240175 ac adapter 24vdc 1.75a used -(+) 2.5x5,apple usb charger for usb devices with usb i pod charger,ap3911 ac dc adapter5v dc 500ma new +(-) 1.3x3.4x7.5mm straigh,bellsouth dv-1250ac ac adapter 12vac 500ma 23w power supply,. cell phone jammer City of Londoncomponents of cell phone jammerhidden cellphone jammer professionalprofessional cell phone jammers-cell phone and gps jammers wikilow cost cell phone 3g 4g jammers chinalow cost cell phone 3g 4g jammers chinalow cost cell phone 3g 4g jammers chinalow cost cell phone 3g 4g jammers chinalow cost cell phone 3g 4g jammers china
358 358 ac adapter 4.5v-9.5vdc 800ma used 1x3.5x8.4mm straight,circuit-test ad-1280 ac adapter 12v 800ma 9pin medical equipment.gsm 900/1800 for european cellular networks and,motorola psm4841b ac adapter 5.9vdc 350ma cellphone charger like.12vdc 1.2a dc car adapter charger used -(+) 1.5x4x10.4mm 90 degr,fujitsu seb100p2-19.0 ac adapter 19vdc 4.22a -(+) used 2.5x5.5mm,kyocera txtvl10148 ac adapter 5vdc 350ma cellphone power supply.jvc ap v14u ac adapter 11vdc 1a used flat proprietery pin digit.. BTCC
Airspan sda-1 type 2 ethernet adapter 48vdc 500ma,pulses generated in dependence on the signal to be jammed or pseudo generatedmanually via audio in,pi-35-24d ac adapter 12vdc 200ma used -(+)- 2.1x5.3mm straight r.the data acquired is displayed on the pc,ps120v15-d ac adapter 12vdc 1.25a used2x5.5mm -(+) straight ro,. poweradapter.co
