Abstract:

The interference suppression method based on the implemented iterative correlation subtraction algorithm--multistage Wiener filter (ICSA-MWF) is developed for reducing the high computational load of subspace projection in passive radar systems. To apply ICSA-MWF to the range Doppler domain, a new initialization is proposed due to the characteristics of interference in the echo channel. According to the property of the forward recursion, the multistage projection is substituted for the subspace projection. Then a simple filter rank selection method is introduced. The backward recursion is implemented by the iterative method, and the output error is the multipath interference suppressed echo signal. The ICSA-MWF method performs well in both interference suppression and robustness with computational simplicity. The simulation results demonstrate the effectiveness of the ICSA-MWF based method.