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The yaw angle between the antenna panel and the flight velocity direction of an airplane causes the spatial steering of ground clutter changing with the range units, that is, the main-lobe clutter is non-stationary along range dimension, which will cause the performance deterioration of clutter suppression, degrading the ground slow-moving target detection ability. To solve this issue, a novel spatial-temporal compensation algorithm is proposed in this paper. In the proposed algorithm, a range compressed clutter signal is firstly transformed into Doppler domain. And then, a spatial-temporal filtering function is established using the prior radar system information to compensate the range-dependent spatial steering of the clutter signal. After eliminating the non-stationary of the observed clutter scene, the subsequent clutter rejection can be well accomplished by applying the multi-channel processing technique, improving the moving target detection performance. Simulation results are provided to validate the effectiveness of the proposed algorithm.
Inspec keywords: Doppler radar; spatiotemporal phenomena; object detection; airborne radar; filtering theory; radar antennas; radar detection; radar clutter; radar signal processing
Subjects: Single antennas; Filtering methods in signal processing; Signal detection; Radar equipment, systems and applications