A modified design method of pulse repetition frequency for synthetic aperture radar system based on the single point equivalent squint model

被引：2

作者：

Liang, Yujie ^{[1
]}

Liang, Yi ^{[1
]}

Zhang, Gang ^{[1
]}

Xing, Mengdao ^{[1
]}

机构：

[1] Xidian Univ, Natl Lab Radar Signal Proc, Xian 710071, Peoples R China

来源：

IET RADAR SONAR AND NAVIGATION | 2021年 / 15卷 / 07期

基金：

中国国家自然科学基金;

关键词：

SAR;

D O I：

10.1049/rsn2.12081

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Pulse repetition frequency (PRF) is an essential parameter in synthetic aperture radar (SAR). However, a small PRF value will cause spectrum ambiguity and a large value will increase the computational complexity. In highly squinted SAR imaging with maneuvering platform, the traditional PRF design methods used are airborne and space borne. SAR systems perform with a low precision because of the complex geometric configuration and system deviations. In order to adapt to the maneuvering platform SAR system, a modified design method of PRF is proposed in this paper. First, the azimuth spectrum of echoes is analyzed by establishing the SAR geometry base on the single point equivalent squint (SPES) model. Subsequently, the calculation of azimuth bandwidth is transformed into an optimization problem, and the lower limit of PRF is obtained by the Golden Section Method. Besides, the criteria of spectrum unambiguity and time sequence constraints in PRF design is also discussed in detail. Simulation experiments demonstrate the feasibility and accuracy of the proposed method.

引用

页码：748 / 759

页数：12

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