Radar high-speed target detection method based on motion parameter estimation

doi:10.7523/j.ucas.2024.011

Abstract

Abstract: Coherent accumulation over a long period of time has been an effective means to enhance radar echo energy. However, for high-speed moving target, within a long coherent processing interval, across range unit (ARU) and Doppler frequency migration (DFM) caused by their velocity and acceleration in the radar radial direction cannot be ignored. Additionally, the velocity ambiguity problem caused by high speed also needs to be addressed. This paper proposes a high-speed target detection method based on motion parameter estimation. By segmenting coherent accumulation, the ARU under each segment is suppressed. The peak position of the echo after accumulation under each segment is used as a sample point for parameter estimation input. A filter is constructed using the target radial acceleration obtained through searching to compensate for nonlinear components in the echo phase. Finally, Keystone transform is used in conjunction with velocity ambiguity term compensation to correct ARU in radar echoes, and coherent accumulation of the high-speed target echo signal is achieved by performing FFT along the azimuth.

Key words: across range unit, Doppler frequency migration, long-time coherent accumulation, high-speed target detection, velocity ambiguity

CLC Number:

TN957

GUO Zhenfang, SUN Jili, WANG Shuai. Radar high-speed target detection method based on motion parameter estimation[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.011.

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