Journal of Astronautics ›› 2012, Vol. 33 ›› Issue (10): 1407-1412.doi: 10.3873/j.issn.1000-1328.2012.10.007

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A Method Using Multiple Calibration for High Orbit Companion Satellite TDOA and FDOA GeoLocation System

GUO Lian-hua, GUO Fu-cheng, LI Jin-zhou   

  1. (School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China)
  • Received:2012-03-22 Revised:2012-06-03 Online:2012-10-15 Published:2012-10-22

Abstract: The systematic errors such as the satellite position, velocity, TDOA and FDOA measurement in the high orbit companion satellite TDOA and FDOA geolocation system are known to degrade the accuracy of geolocation seriously. A calibration method based on four or more calibrations on the earth surface is proposed in this paper. The systematic errors of TDOA and FDOA measurement are eliminated by using difference technique. Then the relative location and velocity between the main satellite and companion satellite are estimated by using multiple calibration sources. Finally the position of the uncooperative radio frequency emitter can be computed by combining the information of TDOA, FDOA and earth surface. It is proven that the mean square error(MSE) of the proposed method could approach the CramerRao lower bound(CRLB) in theory and simulation, when the random errors of TDOA and FDOA measurement are small.

Key words: Satellite,  , Passive location,  , TDOA,  

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