A coherent signal integration method for high-speed maneuvering target based on K-adjacent pulse time-frequency double inversion transform

doi:10.7523/j.ucas.2024.028

Abstract

Abstract: To address the problem of echo gain loss caused by range migration and Doppler frequency migration during long-time coherent accumulation of high-speed maneuvering targets detection, a fast coherent integration algorithm based on K-adjacent pulse time-frequency double inversion transformation is proposed. By multiplying the distance-frequency and slow-time double-reversed conjugate signal of the Kth adjacent pulse with the target signal in the distance-frequency and slow-time domain, the across range unit and Doppler frequency migration in the signal can be simultaneously eliminated. At the same time, the time-frequency inversion cross-correlation algorithm is introduced as a supplement to estimate the target's distance, velocity, and acceleration information through joint calculation. Finally, the compensation function is constructed to complete the focusing of echo energy on the distance-Doppler plane. Simulation results show that the proposed method can effectively estimate the second-order high-speed target motion parameters without any parameter search conditions, with low computational complexity. Moreover, the K-adjacent pulse time-frequency dual inversion transformation and time-frequency inversion cross-correlation can be implemented in parallel to further improve the computational speed.

Key words: high-speed maneuvering target detection, parameter estimation, long-time coherent integration

CLC Number:

TN957

WANG Ruizheng, LI Shiqiang. A coherent signal integration method for high-speed maneuvering target based on K-adjacent pulse time-frequency double inversion transform[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.028.

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