This paper considers the problem of tracking a mobile receiver using signals of Low Earth Orbit (LEO) satellites. Based on Time-Difference of Arrival (TDOA) and Frequency-Difference of Arrival (FDOA), we joint the time synchronization and localization together with a static reference anchor, which has unknown position. In this scenario, the satellites is asynchronous. Considering the time- and frequency- offsets as additional unknown parameters, we proposed a Maximum Likelihood estimation approach to get the reference anchor's location and offsets. Then a sequential estimator jointly track the receiver location, velocity using extended Kalman filter (EKF) after revising the TDOA and FDOA measurements. Simulations demonstrate that our measurement model has a good fit, and our proposed estimator can successfully track both the receiver location, velocity with respect to the reference anchor with good accuracy.
Joint Navigation and Synchronization in LEO Dual-Satellite Geolocation Systems
2017-06-01
251075 byte
Conference paper
Electronic Resource
English
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