Nonlinear Estimators for Multi-sensor/ Multi-target Tracking and Synchronization

摘要

Research was Conducted on code synchronization and jammer suppression for GPS receivers. The modulated lapped transform (MLT) was employed to decorrelate the jammer in time, and better isolate jammer components from the signal in the time-frequency plane. The extended Kalman filter (MLT-EKF) and generalized likelihood ratio test (GLRT) were used to both track and acquire the unknown code delay. Simulation studies for various stationary and swept tone jammers were conducted. It was found that the MLT-EKF could acquire and track the GPS C/A code in the presence of a chirp jammer with a sweep rate of up to 2000 mHz per second.