分布式星载单基线SAR-ATI/DPCA技术性能分析与对比  

Performance Analysis and Comparison for Distributed Spaceborne Single-Baseline SAR-ATI/DPCA

作　　者：蔡斌[1,2] 赖涛[2] 张永胜[2] 杜湘瑜[2] 

机构地区：[1]空军工程大学,陕西西安710077 [2]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2010年第2期291-297,共7页Journal of Signal Processing

基　　金：国家自然科学基金项目(60902092)

摘　　要：SAR-ATI和SAR-DPCA技术是分布式星载单基线SAR-GMTI系统常用的杂波抑制和运动目标检测方法。本文从运动目标检测性能出发,以两种处理技术的杂波和动目标的信号模型和统计分布模型为基础,考虑杂波和加性噪声、通道幅度/相位不一致性误差、频率同步误差等影响因素,对ATI和DPCA技术的动目标检测性能进行分析和对比。仿真实验表明在地面场景均匀同质假设下,DPCA的检测性能优于ATI技术;通道相位误差对ATI和DPCA技术影响较大;在采取了一定的同步措施前提下,频率同步误差对两种技术的检测性能影响相对较小。For distributed spaceborne single-baseline SAR-GMTI systems,SAR-ATI and SAR-DPCA are the two ordinarily exploited clutter suppression and moving target detection techniques.Based on the signal model and statistical model of the two clutter cancellers,the detection performance of ATI and DPCA are analyzed and compared,with a consideration to the channel amplitude/phase unbalance error,time/frequency synchronization error and the influence of clutter and noise.Simulation experiments demonstrate that DPCA is better than ATI under the homogeneous area assumptions.Channel amplitude/phase unbalance error are important error to performance degradation.After some preprocessing steps,frequency synchronization error are not very serious.

关 键 词：星载SAR-GMTI ATI DPCA 通道幅度/相位不一致性误差 频率同步误差 性能分析与对比 

分 类 号：TN957[电子电信—信号与信息处理]