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A coherent signal integration method for high-speed maneuvering targets based on K-adjacent pulse time-frequency double inversion transform
Received date: 2024-01-23
Revised date: 2024-04-22
Online published: 2024-05-22
To address the problem of echo gain loss caused by range migration and Doppler frequency migration during long-time coherent accumulation of detection of high-speed maneuvering targets， 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 signal 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， 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.
Ruizheng WANG , Shiqiang LI . A coherent signal integration method for high-speed maneuvering targets based on K-adjacent pulse time-frequency double inversion transform[J]. Journal of University of Chinese Academy of Sciences, 2026 , 43(2) : 265 -276 . DOI: 10.7523/j.ucas.2024.028
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