Abstract:

The directpath and multipath reflected clutter cannot be cancelled completely when there is fractionaldelay between the echo signal and reference signal in a passive radar. A novel algorithm of clutter cancellation is presented, which has the form of noncausal normalized least mean square (NLMS) adaptive filter. Based on the interpolation theory, the general adaptive canceller can be extended by adding few noncausal coefficients, which is adaptive insertion algorithm equivalently for the least mean square error (LMSE) criterion. The simulation results indicate that the algorithm presented can achieve a better performance than the general cancellation technique at prese〖JP〗nt and has lower complication, which is of great benefit to the real-time implementation.