Discrimination of low-flying vehicle from ground moving targets using multi-path

The detection of low-flying vehicle by a pulse-Doppler radar is seriously interfered by ground moving targets, for that they have similar Doppler frequency. In multi-path environment, TDOA and DDOA of the low-flying vehicle direct reflection and its multi-path image have some constraint relationship, while this property is not possessed by ground moving target. By taking advantage of this property, a novel approach of discriminating low-flying vehicle from ground moving targets is proposed, which involves the technique of high resolution spectrum estimation. This idea is approved by theoretical analysis and simulation testing, and some applicable system conditions are also discussed.