A Robust Space-Time Clutter Cancellation Algorithm for Airborne Passive Radar

This paper investigates the problem of clutter cancellation in airborne passive radar. To avoid the cancellation of targets falling in the clutter Doppler band, a robust space-time cancellation algorithm is proposed for the sidelooking airborne passive radar. Making use of the spatial-Doppler dependence of clutter, this algorithm cancels clutter along the clutter ridge and thus avoids the cancellation of targets. In addition, to ensure the performance in the existence of sensor errors, the adaptive estimation of sensor errors is introduced, making the proposed algorithm robust in practice. Simulation results with the experimental data show that clutter can be cancelled effectively with the proposed algorithm and signal-to-noise ratio (SNR) losses of targets in clutter Doppler band are slight, for example the losses are within 3dB for targets with radial velocity greater than 5m/s in the existence of the sensor errors, of which the standard deviation is 0.05.