Opportunistic Time Synchronization Using Signals From Low Earth Orbit Communications Satellites

Abstract

This thesis develops a receiver that is capable of utilizing opportunistic pseudorange, Doppler shift, and Angle of Arrival (AoA) measurements to jointly estimate precise receiver time as well as satellite position states. To accomplish this, the multi-antenna receiver is placed at a known, stationary location, with distances between antennas fully determined beforehand. The aforementioned measurements are inputs to an Iterated Extended Kalman Filter (IEKF) algorithm, the outputs of which are estimates of the receivers clock offset and clock drift.