--------------------------------------------------------------------------- Historical data output by GRID in GRID binary exchange (GBX) 2.0 format. Data are either single frequency GPS L1 C/A (marked SF) or dual-frequency GPS L1 C/A and GPS L2C (marked DF). To download one of the files below, simply use wget as follows: wget http://radionavlab.ae.utexas.edu/datastore/gridData/dataout_sounding_rocket01.bin . Expand these binary files using binflate_x86_static_v2 as follows (for example file dataout.bin): binflate_x86_static_v2 -i dataout.bin To see the data during expansion, use the -r option: binflate_x86_static_v2 -i dataout.bin -r 1 --------------------------------------------------------------------------- dataout_sounding_rocket01.bin (DF) From GRID/FOTON receiver launched on a sounding rocket into a brilliant display of aurora borealis from Poker Flat, Alaska in Feb. 2012. A description of the receiver and an analysis of the data are given in E.G. Lightsey, T.E. Humphreys, J.A. Bhatti, A.J. Joplin, B.W. O’Hanlon, and S.P. Powell, "Demonstration of a Space Capable Miniature Dual Frequency GNSS Receiver," NAVIGATION, Journal of the Institute of Navigation, 61(1): 53-64, 2014. --------------------------------------------------------------------------- dataout_fiction_island01.bin (DF) From GRID receiver hooked to Cornell's Spirent GNSS simulator (ut2). Simulation is of a static receiver at Fiction Island (x = 6378137 m, y = 0 m, z = 0 m). No iono or tropo delay is simulated. This data set is good for verifying the accuracy of one's navigation solution. --------------------------------------------------------------------------- dataout_low_earth_orbit01.bin (DF) From GRID receiver hooked to Cornell's Spirent GNSS simulator (ut6). Simulation is of a satellite in low earth orbit. Note the large Doppler frequencies due to the ~7 km/s satellite velocity. --------------------------------------------------------------------------- dataout_simulated_scintillation01.bin (DF) From GRID receiver hooked to Cornell's Spirent GNSS simulator (ut8). Simulation is of a static receiver at Fiction Island (x = 6378137 m, y = 0 m, z = 0 m). Strong scintillation is simulated for a subset of signals starting after about 850 seconds. The simulation is also unique in that 4 of the 6 simulated SVs are geosynchronous. --------------------------------------------------------------------------- dataout_wardrive_*.bin (SF) From wardriving data set collected in December 2010 in Austin, TX. GPS L1 C/A and WAAS SBAS only. Various scenarios in static, dynamic, open-sky, rural, and deep urban conditions. See file names for scenario descriptions. Multipath and signal blockage by trees or buildings make some of the dynamic scenarios quite challenging. The data files dataout_wardrive_deep_urban_dynamic_1945_3M_brazos_try2.bin dataout_wardrive_deep_urban_dynamic_1973_45M_brazos_try2.bin have accompanying received power time histories in a 4 MHz bandwidth around GPS L1. The time histories are found in the files power_time_history_deep_urban_dynamic_1945_3M_brazos_try2.mat power_time_history_deep_urban_dynamic_1973_45M_brazos_try2.bin In these power time history files, power is expressed in dB and time is expressed in raw receiver time. --------------------------------------------------------------------------- dataout_antarctic01.bin (DF) Data from GRID receiver at South Pole, Antarctica. --------------------------------------------------------------------------- dataout_jicamarca01.bin (DF) Data from GRID receiver in Jicamarca, Peru taken during some mild post-sunset ionospheric scintillation. --------------------------------------------------------------------------- dataout_july2014_flyday01.bin (DF) Data from UAV flyday on July 25, 2014. This is the reference data set, taken through the Trimble Zephyr antenna at location WRW0. CDGPS solutions from other flyday data sets should use this set as reference. --------------------------------------------------------------------------- dataout_july2014_flyday02.bin (DF) Data from UAV flyday on July 25, 2014. Static data set with antenna positioned on the west hatch of the south 20 yard line in Memorial Stadium. This data set can be used to analyze the multipath environment in the stadium and to analyze CDPGS solutions with a baseline of about 0.6 km (WRW0 to the stadium). --------------------------------------------------------------------------- dataout_july2014_flyday03.bin (DF) Data from UAV flyday on July 25, 2014. Static data set with antenna positioned on the east hatch of the south 20 yard line in Memorial Stadium. This data set can be used to analyze the multipath environment in the stadium and to analyze CDPGS solutions with a baseline of about 0.6 km (WRW0 to the stadium). --------------------------------------------------------------------------- dataout_july2014_flyday04.bin (SF) Data from UAV flyday on July 25, 2014. Data from GRID receiver onboard UAV in Memorial Stadium (flight 4). 45 seconds into flight the UAV began to wobble severely. --------------------------------------------------------------------------- dataout_july2014_flyday05.bin (SF) Data from UAV flyday on July 25, 2014. Data from GRID receiver onboard UAV in Memorial Stadium (flight 7). --------------------------------------------------------------------------- dataout_zephyr_short_baseline01.bin (DF) dataout_taoglas_short_baseline01.bin (SF) Data from a 4-hour simultaneous data capture on two antennas over a 22-meter baseline atop the WRW building on UT campus. The Zephyr data should be considered the reference -- they were taken with an expensive (~$3k) Trimble Zephyr II antenna at location WRW0. The Taoglas data were taken with an inexpensive (~$15) Taoglas antenna (model No: Dominator AA.161, in black plastic enclosure with built-in ground plane) on the WRW the roof above the RNL windows. Both antennas were static throughout the data capture interval. These are good datasets for testing short-baseline static CDGPS. ---------------------------------------------------------------------------