Abstract: In a single channel medium PRF pulse doppler radar receiver, the return signal data is processed to prevent sidelobe return signals from being displayed and rejects ground moving targets up to approximately 80 knots while having no high velocity blind speeds. After the returns are filtered by a doppler filter notch for rejecting returns having a velocity substantially less than the 80 knot example, the return data undergoes three stages of correlations to reject sidelobe returns, and undergoes processing including a fourth correlation which enables the third stage of correlation to output a signal only for unambiguous ranges that contain target data in excess of the 80 knot range.

Abstract: A method and apparatus is described for the post processing of return signal data in a single channel medium PRF pulse doppler radar receiver. The disclosure is directed to preventing sidelobe return signals from being displayed as "ghost" or "false" targets. The received signal data is preliminarily processed by a filter bank and a CFAR threshold circuit to remove main beam clutter and area sidelobe clutter returns. The preliminarily processed data is then temporarily stored as two parallel correlations are performed on a range cell by range cell basis to identify range cells which contain discrete sidelobe clutter return signals. One of the parallel correlations is performed on the data after it has passed an STC (Sensitivity Time Control) threshold circuit and the other parallel correlation is performed on the raw data. The outputs of the parallel correlators are compared.