一种高速机动平台SAR成像PRF改进设计方法

doi:10.12305/j.issn.1001-506X.2025.09.12

摘要/Abstract

摘要：

针对临近空间高速机动平台合成孔径雷达（synthetic aperture radar，SAR）远距离成像时天线俯仰向波束覆盖地面场景范围大、方位向信号多普勒带宽较大，存在脉冲重复频率（pulse repetition frequency，PRF）难以设计的问题，结合工程应用需求将天线波束覆盖区域距离模糊约束和方位模糊约束条件放宽为SAR成像区域距离向回波与方位向多普勒频谱不模糊，基于此分别提出PRF上限值与下限值改进设计方法。仿真结果表明，在机动平台高速运动前斜视聚束SAR成像时所提方法能有效扩展PRF选择范围。所提改进方法能够更好地满足实际工程应用。

关键词: 高速机动平台, 合成孔径雷达, 脉冲重复频率, 距离模糊, 方位模糊

Abstract:

When the high-speed maneuvering-platform synthetic aperture radar （SAR） is used for long-range imaging, there exists a problem that the pulse repetition frequency （PRF） is difficult to design, due to the large coverage range of the antenna’s pitch beam on the ground scene and the large Doppler bandwidth of the azimuth signal. To address this problem, combined with the requirements of engineering application, the range ambiguity and azimuth ambiguity constraints of the antenna beam coverage area are relaxed to the range echo and the azimuth Doppler spectrum of the SAR imaging area are unambiguous. Based on this, the improved design method of the PRF upper and lower limits is proposed. Simulation results show that the proposed method for high-speed manoeuvring SAR imaging with squint beam can effectively extend the range of PRF selection. The proposed imposed improved method can better meet the need of practical engineering applications.

Key words: high-speed maneuvering-platform, synthetic aperture radar （SAR）, pulse repetition frequency （PRF）, range ambiguity, azimuth ambiguity

中图分类号:

TN 957

朱国辉, 杨琳, 汪洋, 郑陶冶. 一种高速机动平台SAR成像PRF改进设计方法[J]. 系统工程与电子技术, 2025, 47(9): 2905-2912.

Guohui ZHU, Lin YANG, Yang WANG, Taoye ZHENG. A modified PRF design method for high-speed maneuvering-platform SAR imaging[J]. Systems Engineering and Electronics, 2025, 47(9): 2905-2912.

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方法	PRF下限值	PRF上限值
文献[19]方法	16.04	9.15
文献[20]方法	32.16	6.61
文献[21]方法	6.68	6.57
本文方法	5.70	11.70

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