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Nonlinear Radar Waveform Analysis for Multipath Intermodulation Suppression
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DOI：10.1109/TAES.2025.3626310.png)
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摘要
En 中文
Nonlinear radar exhibits exceptional clutter suppression capability but still faces multipath (MP) interference in complex environments. Unlike conventional radar, MPs in nonlinear radar will intermodulate with direct path signals, generating extra frequencies, a phenomenon termed multipath intermodulation (MPIM). To analyze this special effect, this article establishes a generalized nonlinear radar MP propagation model, which is applicable to arbitrary radar waveforms, MP configurations, and intermodulation (IM) products. We evaluate the influence of radar waveforms on MPIM interference. To mitigate this interference, a random step frequency (RSF) waveform is introduced. We analyze the basic performance of the RSF waveform and provide recommendations for parameter selection. Simulations in dense MP scenarios demonstrate that the RSF waveform can clearly distinguish true targets from MPIM interference. Statistical results from sparse MP scenarios validate that the RSF waveform can effectively suppress MPIM interference.
Keyword:
Intermodulation (IM)
multipath (MP)
nonlinear radar
nonlinear scattering
radar waveform