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A long-term energy focusing method for plasma-sheath-covered targets

  

  • Received:2022-06-30 Revised:2022-09-26 Online:2022-09-30 Published:2022-09-30
  • Contact: 廷焜 张
  • Supported by:
    National Natural Science Foundation of China;Natural Science Basic Research Plan in Shanxi Province of China

Abstract: As the reentry object travels at hypersonic speeds, its surface is covered by a plasma sheath. The plasma sheath modulates the radar echo in amplitude, phase, and frequency, which seriously affects the reliable detection capability of the radar for reentry targets, resulting in various abnormal radar detection problems. In this paper, the influence of the plasma sheath on the radar echo is analyzed by establishing the radar echo model of the target covered by the plasma sheath. An intra-pulse Doppler frequency cancellation method based on slow time autocorrelation is proposed, which can effectively solve the multi-Doppler frequency phenomenon in the radar echo caused by the non-uniform plasma sheath. The leaf transform and the inverse Fourier transform decouple the coupling terms in the correlated signal, thereby realizing the energy focusing of the signal. The validity of the algorithm proposed in this paper is verified by the simulation analysis of the multi-period echo signal, and the reliability of the algorithm is verified by combining the experimental statistical analysis, which provides an effective method for the coherent accumulation of the plasma sheath coated target method.

Key words: Plasma sheath, Radar echo, intra-pulse Doppler frequency, slow time autocorrelation, energy focus

CLC Number: