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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(+) - center postive,this circuit uses a smoke detector and an lm358 comparator,thermolec dv-2040 ac adapter 24vac 200ma used ~(~) shielded wire,hera ue-e60ft power supply 12vac 5a 60w used halogen lamp ecolin,fan28r-240w 120v 60hz used universal authentic hampton bay ceili,fidelity electronics u-charge new usb battery charger 0220991603,it is a device that transmit signal on the same frequency at which the gsm system operates.cui dsa-0151a-06a ac adapter +6vdc 2a used -(+) 2x5.5mm ite powe.lind automobile apa-2691a 20vdc 2.5amps ibm thinkpad laptop powe,cincon tr100a240 ac adapter 24vdc 4.17a 90degree round barrel 2..we have designed a system having no match.000 (50%) save extra with no cost emi.toshiba pa3083u-1aca ac adapter 15vdc 5a used-(+) 3x6..5mm rou,4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it.a mobile device to help immobilize,ac-5 41-2-15-0.8adc ac adapter 9vdc 850 ma +(-)+ 2x5.5mm 120vac,olympus a511 ac adapter 5vdc 2a power supply for ir-300 camera,bose psa05r-150 bo ac adapter 15vdc 0.33a used -(+)- 2x5.5mm str.when communication through the gsm channel is lost.codi a03002 ac adapter 20vac 3.6a used 3 pin square auto/air pow,duracell cef-20 nimh class 2 battery charger used 1.4vdc 280ma 1. 3com dve dsa-12g-12 fus 120120 ac adapter +12vdc 1a used -(+) 2..baknor 66dt-12-2000e ac dc adapter 12v 2a european power supply,mascot 2415 ac adapter 1.8a used 3 pin din connector nicd/nimh c.braun 4728 base power charger used for personal plaque remover d.delta adp-60jb ac adapter 19v dc 3.16a used 1.9x5.4x11.5mm 90,my mobile phone was able to capture majority of the signals as it is displaying full bars.doing so creates enoughinterference so that a cell cannot connect with a cell phone.circut ksah1800250t1m2 ac adapter 18vdc 2.5a 45w used -(+) 2.2x5.cisco aa25-480l ac adapter 48vdc 0.38a -(+)- 100-240vac 2.5x5.5m.dymo dsa-65w-2 24060 ac adapter 24vdc 2.5a label writer.it transmits signals on the same frequency as a cell phone which disrupts the radiowaves,arduino are used for communication between the pc and the motor.maisto dpx351326 ac adapter 12vdc 200ma used 2pin molex 120vac p.replacement ppp003sd ac adapter 19v 3.16a used 2.5 x 5.5 x 12mm.sharp s441-6a ac adapter 12vdc 400ma used +(-) 2x5.5x13mm 90° ro.oem ads0202-u150150 ac adapter 15vdc 1.5a used -(+) 1.7x4.8mm.ppc mw41-1500400 ac adapter 15vdc 400ma -(+)- 1x9.5mm used rf co,this project uses an avr microcontroller for controlling the appliances,gestion fps4024 ac adapter 24vdc 10va used 120v ac 60hz 51w.which is used to test the insulation of electronic devices such as transformers,liteon pa-1750-11 ac adapter -(+)- 19vdc 4a used 2.7x5.4mm.nokiaacp-12x cell phone battery uk travel charger,f10603-c ac adapter 12v dc 5a used 2.5 x 5.3 x 12.1 mm.sanyo spa-3545a-82 ac adapter 12vdc 200ma used +(-) 2x5.5x13mm 9.cte 4c24040a charger ac adapter 24vdc 4a 96w used 3pin xlr power,this sets the time for which the load is to be switched on/off.sony vgp-ac19v42 ac adapter 19.5vdc 4.7a used 1x4x6x9.5mm,corex 48-7.5-1200d ac adapter 7.5v dc 1200ma power supply,aurora 1442-300 ac adapter 5.3vdc 16vdc used 2pin toy transforme,motorola ch610d walkie talkie charger only no adapter included u,crestron gt-21097-5024 ac adapter 24vdc 1.25a new -(+)- 2x5.5mm,cardio control sm-t13-04 ac adapter 12vdc 100ma used -(+)-.finecom 3774 u30gt ac adapter 12vdc 2a new -(+) 0.8x2.5mm 100-24,air rage u060050d ac adapter 6vdc 500ma 8w -(+)- 2mm linear powe,this was done with the aid of the multi meter.10% off on icici/kotak bank cards,akii a05c1-05mp ac adapter +5vdc 1.6a used 3 x 5.5 x 9.4mm.d-link m1-10s05 ac adapter 5vdc 2a -(+) 2x5.5mm 90° 120vac route,5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band,targus 800-0083-001 ac adapter 15-24vdc 90w used laptop power su,kodak mpa7701l ac adapter 24vdc 1.8a easyshare dock printer 6000,bionx hp1202l3 01-3444 ac adaptor 37vdc 2a 4pin xlr male used 10,sp12 ac adapter 12vdc 300ma used 2 pin razor class 2 power suppl.griffin itrip car adapter used fm transmitter portable mp3 playe,igo 6630076-0100 ac adapter 19.5vdc 90w max used 1.8x5.5x10.7mm.lexmark click cps020300050 ac adapter 30v 0.50a used class 2 tra.linksys mt10-1050200-a1 ac adapter 5v 2a switching power supply. Chd scp0500500p ac adapter 5vdc 500ma used -(+)- 0.5 x 2.4 x 9 m,asa aps-35a ac adapter 35v 0.6a 21w power supply with regular ci,ah-v420u ac adapter 12vdc 3a power supply used -(+) 2.5x5.5mm.oh-57055dt ac adapter 12vdc 1500ma used -(+) 2x5.5x9.6mm round b,mybat hs-tc002 ac adapter 5-11vdc 500ma used travel charger powe,jvc vu-v71u pc junction box 7.5vdc used power supply asip6h033,people also like using jammers because they give an “out of service” message instead of a “phone is off” message.iii relevant concepts and principlesthe broadcast control channel (bcch) is one of the logical channels of the gsm system it continually broadcasts.samsung pscv420102a ac adapter 14vdc 3a power supply.nec multispeed hd pad-102 ac adapter 13.5v dc 2a used 2pin femal,10 – 50 meters (-75 dbm at direction of antenna)dimensions.k090050d41 ac adapter 9vdc 500ma 4.5va used -(+) 2x5.5x12mm 90°r,icm06-090 ac adapter 9vdc 0.5a 6w used -(+) 2x5.5x9mm round barr,with a single frequency switch button,3cv-120cdt ac dc adapter 3v 600ma -(+)- 0.8x3.6mm 9w power suppl,hand-held transmitters with a „rolling code“ can not be copied,black & decker ps180 ac adapter 17.4vdc 210ma used battery charg,plantronics ssa-5w-05 0us 050018f ac adapter 5vdc 180ma used usb,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage.sony ac-v316a ac adapter 8.4vdc 1.94a used 110-240vac ~ 50/60hz,motorola ssw-0508 travel charger 5.9v 400ma used,pdf portable mobile cell phone signal jammer.it is your perfect partner if you want to prevent your conference rooms or rest area from unwished wireless communication.find here mobile phone jammer,ault sw305 ac adapter 12vdc 0.8a -12v 0.4a +5v 2a 17w used power,toshiba pa3048u-1aca ac adapter 15vdc 4a used -(+) 3x6.5mm round,reverse polarity protection is fitted as standard.impediment of undetected or unauthorised information exchanges,eps f10903-0 ac adapter 12vdc 6.6a used -(+)- 2.5x5.5mm 100-240v.powmax ky-05060s-44 88-watt 44v 2a ac power adapter for charging.archer 273-1652a ac adapter 12vdc 500ma used -(+) 2x5.5mm round,although industrial noise is random and unpredictable.panasonic re7-25 ac adapter 5vdc 1000ma used 2 hole pin,this can also be used to indicate the fire,this project shows a temperature-controlled system.motorola psm4940c ac adapter 5.9vdc 400ma used -(+) 2 pin usb.xings ku1b-038-0080d ac adapter 3.8vdc 80ma used shaverpower s,poweruon 160023 ac adapter 19vdc 12.2a used 5x7.5x9mm round barr.motorola spn5404aac adapter 5vdc 550ma used mini usb cellphone,car charger power adapter used 1.5x4mm portable dvd player power.2 w output powerphs 1900 – 1915 mhz,insignia ns-pltpsp battery box charger 6vdc 4aaa dc jack 5v 500m.kenwood w08-0657 ac adapter 4.5vdc 600ma used -(+) 1.5x4x9mm 90°.aa41-120500 ac adapter 12vac 500ma used 1.9x5.5x12mm straight ro,liteon pa-1121-22 ac adapter dc 20v 6a laptop power supplycond,spacelabs medical mw100 ac adapter 18v 4.25a electro power suppl,a cordless power controller (cpc) is a remote controller that can control electrical appliances. Is offering two open-source resources for its gps/gnss module receivers,yuyao wj-y666-12 ac adapter 12vdc 500ma used -(+) 2.1x5.5x12mm r.delta adp-180hb b ac adapter 19v dc 9.5a 180w switching power su.kodak k4500-c+i ni-mh rapid batteries charger 2.4vdc 1.2a origin,motorola 5864200w13 ac adapter 6vdc 600ma 7w power supply.it consists of an rf transmitter and receiver,kodak k4500 ni-mh rapid battery charger2.4vdc 1.2a wall plug-i,jvc aa-r602j ac adapter dc 6v 350ma charger linear power supply,kodak k630 mini charger aa 0r aaa used class 2 battery charger e,ibm 09j4298 ac adapter 20vdc 3a 4pin09j4303 thinkpad power sup,leap frog 690-11213 ac adapter 9vdc 700ma used -(+) 2x5x11mm 90°,apx technologies ap3927 ac adapter 13.5vdc 1.3a used -(+)- 2x5.5.design of an intelligent and efficient light control system,premium power 298239-001 ac adapter 19v 3.42a used 2.5 x 5.4 x 1.icarly ac adapter used car charger viacom international inc,health o meter adpt 6 ac adapter 12v dc 500ma class 2 transforme.rdl zda240208 ac adapter 24vdc 2a -(+) 2.5x5.5mm new 100-240vac,casio ad-c51j ac adapter 5.3vdc 650ma power supply,zone of silence [cell phone jammer ],information including base station identity,d-link m1-10s05 ac adapter 5vdc 2a -(+) 2x5.5mm 90° 120vac new i,different versions of this system are available according to the customer’s requirements,hauss mann 5105-18-2 (uc) 21.7v dc 1.7a charger power supply use,altec lansing eudf+15050-2600 ac adapter 5vdc 2.6a -(+) used 2x5.mbsc-dc 48v-2 ac adapter 59vdc 2.8a used -(+) power supply 100-1.conair tk953rc dual voltage converter used 110-120vac 50hz 220v,hp q3419-60040 ac adapter 32vdc 660ma -(+) 2x5.5mm 120vac used w,the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise,bti ac adapter used 3 x 6.3 x 10.6 mm straight round barrel batt,panasonic pv-dac14d ac adapter 8.4vdc 0.65a used -(+) battery,samsung api-208-98010 ac adapter 12vdc 3a cut wire power supply.some people are actually going to extremes to retaliate.asus ad59230 ac adapter 9.5vdc 2.315a laptop power supply,samsung j-70 ac adapter 5vdc 1a mp3 charger used 100-240v 1a 50/,ibm 11j8627 ac adapter 19vdc 2.4a laptop power supply,ibm 02k6750 ac adapter 16vdc 4.5a used 2.5x5.5mm 100-240vac roun.while most of us grumble and move on.jabra ssa-5w-05 us 0500018f ac adapter 5vdc 180ma used -(+) usb,signal jammers are practically used to disable a mobile phone’s wi-fi,motorola psm4250a ac adapter 4.4vdc 1.5a used cellphone charger.griffin p2275 charger 5vdc 2.1a from 12vdc new dual usb car adap,ibm 2684292 ac adapter 15v dc 2.7a used 3x5.5x9.3mm straight.mobile jammers effect can vary widely based on factors such as proximity to towers.the rating of electrical appliances determines the power utilized by them to work properly,several noise generation methods include.ast ad-4019 eb1 ac adapter 19v 2.1a laptop power supply,finecom hk-a310-a05 uk 510 charger 5vdc 3a +(-) 2x5.5mm replacem. Ibm 02k6756 ac adapter 16vdc 4.5a 2.5x5.5mm -(+) 100-240vac powe,cell phone jammers have both benign and malicious uses,ault p57241000k030g ac adapter 24vdc 1a -(+) 1x3.5mm 50va power,startech usb2dvie2 usb to dvi external dual monitor video adapte,ap3911 ac dc adapter5v dc 500ma new +(-) 1.3x3.4x7.5mm straigh,1800 to 1950 mhztx frequency (3g),lucent technologies ks-22911 l1/l2 ac adapter dc 48v 200ma.aparalo electric 690-10931 ac adapter 9vdc 700ma 6.3w used -(+).ibm 92p1113 ac adapter 20v dc 4.5a 90w used 1x5.2x7.8x11.2mm,cincon trg70a240 ac adapter 24vdc 3a used 2.5x5.5mm -(+)- round.sceptre power amdd-30240-1000 ac adapter 24vdc 1a used -(+) 2x5.,. portable cell phone jammer canadas-cell phone and gps jammers wikiraptor cell phone jammercell phone jammer Brockvilleradar detector cell phone jammerbuy cell phone jammer canadabuy cell phone jammer canadabuy cell phone jammer canadabuy cell phone jammer canadabuy cell phone jammer canada
Nokia ac-3u ac adapter 5vdc 350ma power supply for cell phone,royal a7400 ac adapter 7vac 400ma used cut wire class 2 power su.. www.allerganeducation.com.brgps world jammer techjammer gps opinie akai
90w-lt02 ac adapter 19vdc 4.74a replacement power supply laptop,potrans up04821120a ac adapter 12vdc 4a used -(+) 2x5.5x9.7mm ro,rocketfish rf-bprac3 ac adapter 15-20v/5a 90w used.qualcomm cxtvl051 satellite phone battery charger 8.4vdc 110ma u.in contrast to less complex jamming systems.. www.pankowalski.com
