摘要
天线相位中心偏置(DPCA,Displaced Phase Center Antenna)技术应用于双通道SAR图像域检测地面慢动目标,具有操作简单、高效实用的特点,因此寻找性能更优的DPCA检测量具有重要的理论和实际意义。本文在深入分析经典图像域DPCA检测量存在的不足的基础上,引入多视平均、共轭相乘处理,提出了几种新的DPCA检测量。理论分析和实验验证表明:新DPCA检测量具有杂波和噪声抑制能力强、旁瓣抑制好、定位精度高等特点,说明共轭相乘操作和多视平均处理能够有效地弥补经典DPCA检测量的缺陷,有效提高检测性能。此外,理论推导了随机噪声和通道之间的绝对增益误差等干扰因素对DPCA检测量的影响,证明了新DPCA检测量具有较强的抗干扰性。
Concerning the detection of ground moving targets in dual-channel SAR images, the DPCA has the advantage of simple operation and effective detection. Therefore, the exploitation of more excellent DPCA metrics is of great significance. According to the a- nalysis of traditional DPCA metrics＇ shortages, the paper proposes several novel DPCA metrics by processing of maltilook average and conjugate multiplier. The theory analysis and simulated results prove that new DPCA metrics can achieve better performance than traditional DPCA metrics,with higher clutter and noise rejection,better sidelobes＇ elimination and more precise detection position of moving targets. Besides, the paper analyzes the influence of he speckle fluctuation noise, receiver noise and imbalance between two channels, then concludes that new DPCA metrics is of strong anti-jamming.
出处
《信号处理》
CSCD
北大核心
2009年第7期1009-1016,共8页
Journal of Signal Processing
基金
国家自然科学基金项目(批准号:60772045)
国防科技大学博士创新基金资助项目
关键词
合成孔径雷达
天线相位中心偏置技术
多视平均
共轭相乘
Synthetic Aperture Radar
Displaced Phase Center Antenna
Multilook Average
Conjugate Multiplier
