Orthogonal waveform design with fractional programming on the ambiguity suppression of SAR systems  

作　　者：Yunkai DENG Yongwei ZHANG Zhimin ZHANG Wei WANG Heng ZHANG 

机构地区：[1]Department of Space Microwave Remote Sensing System,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Information Sciences)》2024年第9期259-275,共17页中国科学（信息科学）（英文版）

基　　金：supported by National Key Research and Development Program of China(Grant No.2023YFB3904901)。

摘　　要：Waveform diversity(WD)represents a dynamic and transformative technology widely used in radar systems to enhance sensitivity and discrimination capabilities.Recently,WD techniques have been extensively explored for their potential ambiguity suppression within synthetic aperture radar(SAR)systems.Among these,the alternate transmitting mode combined with orthogonal waveforms emerges as a particularly promising solution.This study focuses on optimizing the power spectrum density(PSD)of signals to design and generate an orthogonal waveform pair that achieves both a low cross-correlation-to-autocorrelation ratio(CAR)and satisfactory imaging performance.Initially,we construct a fractional programming model with convex constraints to minimize the CAR.To address this challenge,we introduce an iterative optimization procedure for the PSD variable,which sequentially reduces the CAR.Each optimization step can be efficiently solved using a quadratically constrained quadratic program,ensuring that the resulting computational complexity remains low.Building on the optimized PSD,we established a parametric piecewise linear model to generate an orthogonal waveform pair.This model not only maintains a low CAR but achieves satisfactory imaging performance in real-time applications.Consequently,this orthogonal waveform pair effectively suppresses range ambiguity in SAR systems.Finally,we demonstrated the practicability and effectiveness of the proposed orthogonal waveforms through detailed simulation experiments,specifically targeting ambiguity suppression in conventional quad-polarization SAR systems.

关 键 词：synthetic aperture radar(SAR) waveform diversity(WD) ambiguity suppression orthogonal waveform fractional programming power spectrum density(PSD) 

分 类 号：TN958[电子电信—信号与信息处理]