杂波背景下目标回波信号积累预置MTI的递归Radon-Fourier变换方法

doi:10.12305/j.issn.1001-506X.2025.09.13

摘要/Abstract

摘要：

雷达系统的时序被分成固定的相参处理间隔(coherent processing interval, CPI)，只有接收完整个CPI内的回波数据，才能应用Radon傅里叶变换(Radon-Fourier transform，RFT)方法实现相参积累，导致系统的处理延时至少是一个CPI的长度。对此，提出一种预置运动目标显示(pre-moving target indication，Pre-MTI)的递归RFT方法，突破RFT方法需要一个整个CPI回波数据的限制。每接收一次回波数据即可实施相参积累，理论上系统处理延时最短到与雷达工作重复周期相当。本文对算法的相参积累增益、相参积累时间和改善因子进行理论分析，给出相应的解析推导。仿真结果表明，通过Pre-MTI处理能够有效抑制杂波，递归RFT变换方法能够对运动目标回波实现有效积累，信噪比和速度分辨率随着递归的脉冲个数增加而增加。通过递归RFT变换方法实线相参积累的系统延时降低，理论上最短延时可达雷达重复周期。

关键词: 时距联合, 相参积累, 运动目标显示, Radon傅里叶变换

Abstract:

The time sequence of radar systems is divided into fixed coherent processing intervals （CPIs）, only by receiving the echo data in an complete CPI can the Radon-Fourier transform （RFT） method be applied for coherent accumulation, resulting in a processing delay of at least one CPI in the system. In regard to this, a recursive RFT method is proposed for pre-moving target indication （Pre-MTI）, which breaks through the limitation that the RFT method requies the echo data in a complete CPI. Each time the echo data is received, coherent accumulation can be implemented, and theoretically the system processing delay is the same as the radar working repetition cycle. This paper provides a theoretical analysis of the coherent accumulation gain, coherent accumulation time, and improvement factor of the algorithm, and provides corresponding analytical derivations. Simulation result shows that the Pre-MTI processing can effectively suppress clutter, and the recursive RFT transformation method can effectively accumulate echoes of moving targets. The signal to noise ratio and velocity resolution increase with the increase of recursive pulses number. The system delay for coherent accumulation realized by the recursive RFT transform method is reduced, and theoretically the shortest delay can reach the repetition period of the radar.

Key words: time-range combination, coherent integration, moving target indication (MTI), Radon-Fourier transform （RFT）

中图分类号:

TN 951

汪海波, 巴涛, 黄文华, 张余川, 庄俊, 张海川. 杂波背景下目标回波信号积累预置MTI的递归Radon-Fourier变换方法[J]. 系统工程与电子技术, 2025, 47(9): 2913-2924.

Haibo WANG, Tao BA, Wenhua HUANG, Yuchuan ZHANG, Jun ZHUANG, Haichuan ZHANG. Recursive Radon-Fourier transform method with pre-MTI for target echo integration in clutter background[J]. Systems Engineering and Electronics, 2025, 47(9): 2913-2924.

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