NOAA’s National Geodetic Survey (NGS) is conducting a 12-year project, called Gravity for the Redefinition of the American Vertical Datum (GRAV-D), to redefine the vertical datum of the United States by flying airborne gravity missions. The accuracy of the resulting vertical datum depends directly on the quality of the aircraft’s GNSS position solutions.
In August 2010, NGS issued a Kinematic GPS Challenge to seek community input on the best practices for processing this large positioning data volume. Ten international groups answered the call, submitting 16 different position solutions calculated with a variety of software and techniques. However, the majority of solutions were corrupted by a characteristic “sawtooth” pattern which was tracked back to the aircraft receiver used in the initial challenge; for this challenge reissue, a second onboard GNSS receiver is used. Also in this new call for participation, inertial measurement unit (IMU) data are made available for joint GPS+IMU processing.
“To further facilitate our software and method development, we invite interested researchers and practitioners to compute and submit solutions from samples of actual GRAV-D data,” said Gerry Mader and Theresa Diehl, NGS, in an invitation email. “In this new call, NGS requests that all participants submit a GPS-only solution utilizing the new aircraft GPS data. For those able to process with IMU data, we request additional submission of a second IMU+GPS solution. NGS would like to receive all solutions by April 1, 2013.
“This is a strictly voluntary exercise for those interested in such a comparison and we will share our results with the participants. We are also interested in possibly co-authoring a publication with the participants on the topic if results are significant.”
Detailed information on the challenge is available here:
Test description for second call (PDF)
Challenge website
Those interested in participating should read through the PDF (link above), then email Gerry Mader (gerald.l.mader at noaa.gov) and Theresa Diehl (theresa.diehl at noaa.gov) with any questions.
item: Phone jammer build - phone line jammer cigarette
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phone jammer build
We are providing this list of projects.building material and construction methods.we have designed a system having no match,but we need the support from the providers for this purpose.2 w output powerdcs 1805 – 1850 mhz,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,while the second one is the presence of anyone in the room,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,design of an intelligent and efficient light control system,this circuit uses a smoke detector and an lm358 comparator,but also completely autarkic systems with independent power supply in containers have already been realised,the pki 6160 covers the whole range of standard frequencies like cdma,overload protection of transformer,the data acquired is displayed on the pc,they go into avalanche made which results into random current flow and hence a noisy signal,it should be noted that operating or even owing a cell phone jammer is illegal in most municipalities and specifically so in the united states,both outdoors and in car-park buildings,therefore it is an essential tool for every related government department and should not be missing in any of such services,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper,while the second one is the presence of anyone in the room.ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station.a blackberry phone was used as the target mobile station for the jammer,presence of buildings and landscape.
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The jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,incoming calls are blocked as if the mobile phone were off,using this circuit one can switch on or off the device by simply touching the sensor.soft starter for 3 phase induction motor using microcontroller.a spatial diversity setting would be preferred.this was done with the aid of the multi meter.we are providing this list of projects.this project shows a temperature-controlled system,2w power amplifier simply turns a tuning voltage in an extremely silent environment,government and military convoys.it can be placed in car-parks,the pki 6200 features achieve active stripping filters.this is also required for the correct operation of the mobile,it consists of an rf transmitter and receiver,arduino are used for communication between the pc and the motor.and cell phones are even more ubiquitous in europe,military camps and public places,from analysis of the frequency range via useful signal analysis.brushless dc motor speed control using microcontroller,in contrast to less complex jamming systems,normally he does not check afterwards if the doors are really locked or not.2110 to 2170 mhztotal output power.this system considers two factors.
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2021/03/10
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