Abstract
This paper deals with the coherent radar detection with non-uniform pulse repetition intervals (PRI), which has strong electronic counter-countermeasures capabilities to enemy jammer thanks to its low interception and difficult to sort. A novel coherent processing framework for the non-uniform PRI returns is proposed to detect moving targets by exploiting the PRI relationship of the transmitting time sequences. It can achieve the range and velocity measurement without ambiguity. In addition, the optimized weighted window in the Doppler domain is designed to suppress the sidelobe levels which is introduced by the non-uniform PRI sequences. Finally, several simulation results are provided and discussed.
Highlights
Coherent radar determines the target range using pulsetiming techniques and employs Doppler effect of the returned signal to determine the target’s radial velocity, which plays a primal role in many fields such as airborne early warning, missile guidance and satellite tracking
As to the non-uniform pulse Doppler processing, we introduce an iteration algorithm based on Alternating Direction Method Of Multipliers (ADMM) [27]–[29] to design weight function to suppress the Doppler sidelobe
The processing method of jitter pulse repetition intervals (PRI) will cause the target energy to be dispersed to multiple distance gates after non-uniform discrete Fourier transform (NUDFT) processing
Summary
Coherent radar determines the target range using pulsetiming techniques and employs Doppler effect of the returned signal to determine the target’s radial velocity, which plays a primal role in many fields such as airborne early warning, missile guidance and satellite tracking. W. Maier proposed the pulse Doppler radar with non-uniform PRI waveform [8], which brings the benefits: high sensitivity [9]–[11], ambiguities elimination [12]–[14] and strong resistance to countermeasures and interception [15]–[18]. Liu proposed a non-uniform PRI MTD algorithm based on compressed sensing [20]–[23] to suppress high Doppler sidelobe [12], [24]. Different from the above methods, we propose a new processing framework for coherent radar with non-uniform PRI. The results highlight the proposed framework outperforms the jitter non-uniform PRI mode by achieving the lower Doppler sidelobe and the higher the target detection probability.
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