| Citation: | Kaiqiang REN, Zhengbo SUN. Wide Area Difference Calibration Algorithm Based on Virtual Reference Station for Tri-satellite TDOA Geolocation System[J]. Journal of Electronics & Information Technology, 2019, 41(2): 433-439. doi: 10.11999/JEIT180289
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A wide area difference calibration algorithm based on Virtual Reference Station (VRS) for tri-satellite Time Difference Of Arrival (TDOA) geolocation system is proposed to solve the problem that traditional difference calibration algorithm can not eliminate the location error caused by ephemeris error completely, especially when the emitter source is far away from the calibration station. Firstly, TDOA measurements of the VRS, which is in the vicinity of emitter source, is estimated by using TDOA measurements of reference station. Then, in order to remove the effect of ephemeris error and synchronization error on location error, TDOA measurements of the VRS is subtracted from that of emitter source. Simulation results demonstrate that the proposed algorithm can almost eliminate the effect of ephemeris error on location error of tri-satellite TDOA geolocation system in wide area.
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