A Clutter suppression method based on Doppler-Crossed STAP

When using space-time adaptive processing (STAP) for wind farm clutter suppression in certain radar system of high frequency, the complete Doppler is usually used for estimating the clutter covariance matrix (CCM). We notice that the wind farm clutter is symmetrical in Doppler domain. Based on this symmetrical characteristic, a clutter suppression method based on Doppler-Crossed STAP is proposed. We use positive Doppler domain data for negative Doppler domain clutter covariance matrix (CCM) estimation and negative Doppler domain data for positive CCM estimation simultaneously. The results based on typical wind farm clutter data show that, the method based on Doppler-Crossed STAP can get 6dB bigger output signal to clutter plus noise rate than existing methods. Which means the method can suppress the windmill clutter and maximize the output signal at the same time.