基于K-相邻脉冲时频双重反转变换的高速机动目标信号相干积累方法
收稿日期: 2024-01-23
修回日期: 2024-04-22
网络出版日期: 2024-05-22
基金资助
科工局民用航天技术预研项目(D010105)
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
针对高速机动目标长时间相干积累过程中跨距离单元和跨多普勒单元造成回波积累增益损失，导致常规积累方法失效的问题，提出一种基于K-相邻脉冲时频双重反转变换的快速相干积累算法，通过在距离频率-慢时间域与相邻第K个脉冲的距离频率和慢时间双重反转共轭信号相乘，消除信号中的跨距离单元走动和多普勒频率徙动。同时，引入时频反转互相关算法作为补充，通过联合计算来估计目标距离、速度和加速度。最后构造补偿函数完成回波能量聚焦。仿真实验结果表明，该方法可以在不进行任何参数搜索的条件下实现二阶高速目标运动参数估计，计算复杂度低。此外，K-相邻脉冲时频双重反转变换与时频反转互相关可并行实现，从而进一步提升运算速度。
王睿铮 , 李世强 . 基于K-相邻脉冲时频双重反转变换的高速机动目标信号相干积累方法[J]. 中国科学院大学学报, 2026 , 43(2) : 265 -276 . DOI: 10.7523/j.ucas.2024.028
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.
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