Airborne radars tasked with detecting low-altitude or ground targets frequently face the challenge posed by ground and sea clutter interference, which can drastically reduce target detection capabilities. To counteract this, airborne radars are necessitated to implement clutter suppression strategies, among which space–time adaptive processing (STAP) stands out as a key technique. Nevertheless, in forward-looking mode, the Doppler frequency of clutter varies with distance due to range dependency. Furthermore, operational modes with medium-to-high pulse-repetition frequencies introduce range ambiguity into radar signals. The combination of clutter range dependency and range ambiguity severely diminishes the clutter suppression efficacy of STAP. In response to these challenges, this article proposes a strategy for suppressing range ambiguous clutter, using slow-time frequency coding and phase waveforms modulation radar. This approach involves utilizing distinct phase waveforms and carrier frequency modulations for different pulses at the transmitter. At the receiver, the method employs joint filtering within the Doppler and waveform domains, exploiting the unique characteristics of the transmitted signal to resolve range ambiguity. In addition, Doppler compensation is deployed to address the issue of clutter range dependency. Ultimately, STAP is utilized to process clutter from each range region individually, thus achieving efficient suppression of range ambiguity clutter. Theoretical analysis and simulation experiments are included, demonstrating the efficacy of the proposed method.
Range Ambiguous Clutter Suppression for Forward-Looking Airborne Radar Based on Frequency Coding and Phase Waveforms Modulation in Slow-Time
IEEE Transactions on Aerospace and Electronic Systems ; 60 , 6 ; 8470-8482
2024-12-01
3038129 byte
Article (Journal)
Electronic Resource
English
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