Comparison of Recursive Least Squares and Kalman Filtering Excisors for SweptTone Interference

摘要

This technical note presents a Kalman filtering approach that is used forfiltering narrowband interferers out of direct sequence spread spectrum signals. The approach is based on the digital phase-locked loop Kalman filter and is close to optimum in so far as demodulating an FM-type of interferer. Because the interference is assumed to be much stronger than either the signal or noise, the Kalman filter locks onto the interference and produces estimates of its phase and envelope. The algorithm is compared, through computer simulation, with the recursive least squares lattice algorithm for the case of a swept tone