COHERENT-PULSE RADAR SIGNALS SPACE-TIME AND TIME-SPACE FILTERING PERFORMANCE EVALUATION

Abstract

The article describes the electronic counter-countermeasures of 36D6 and 80K6 air surveillance radars in jamming and clutter conditions. The algorithm of space-time processing that uses jamming signal cancelling at the first stage and Doppler filtering at the second one has been described. The algorithm of time-space processing that performs main and auxiliary channel signals Doppler filtering at the first stage has also been described. Jammer signal cancelling is performed in frequency domain at the second stage. The efficacy of both systems by simulation using actual interference signals recorded in real life conditions has been determined. The simulation results showed that the space-time filter with use of adaptation inside the coherent processing interval (CPI) is more effective than the same filter that adapts between CPIs. Time-space filtering in jamming and clutter conditions has advantages over space-time filtering. The efficiency of time-space filtering is limited because of Doppler filter magnitude response sidelobes.