宽带信号全数字去斜与脉压方法研究  

A Study on Method of Full Digital Dechirp Pulse Compression for Wide-band Signals

作　　者：汪欣[1] 陈海红[1] 

机构地区：[1]南京电子技术研究所,南京210039

出　　处：《现代雷达》2011年第9期34-36,41,共4页Modern Radar

摘　　要：针对上一代逆合成孔径雷达中1 GHz带宽成像通道的不足,如成像距离短、相位非线性误差提取困难、目标相位信息丢失等。文中采用新一代宽带数字接收机模块,采用全数字方案,上行通道在1.8 GHz的中频上直接产生1 GHz带宽信号,下行通道在1.8 GHz的中频上直接对1 GHz带宽信号进行ADC采样,并实时完成随后的信号处理直至得到一维像。实验表明:在1.8 GHz的中频上,对带宽1 GHz、脉冲宽度400μs信号,该方法可以实时完成±5 km的一维像处理,而其硬件规模只是一个6U标准的CPCI模块。This paper aimed at the shortages and application limitations of 1 GHz wide-band image channel in current ISAR image model, such ashort imaging range, hard to extract the phase nonlinear error, targets phase information missing, etc. A new wideband digital receiver module was researched, in which a full digital design was adopted. In the upwards channel a 1 GHz bandwidth signal was generated directly at I. 8 GHz IF, and in the corresponding downwards channel the 1 GHz bandwidth signal was sampled directly by ADC at 1.8 GHz IF. The followed signal processing was real-time and one-dimensional image was obtained. The experi- mentation result presented that the new method could deal with a 1 GHz bandwidth and 400 μs pulsewidth signal at 1.8 GHz IF, and could achieve ±5 km one-dimensional imaging real-time processing, with the only 6U standard CPCI module hardware scale.

关 键 词：逆合成孔径雷达 相位非线性 数字下变频 去斜处理 低通滤波 快速傅里叶变换 

分 类 号：TN958[电子电信—信号与信息处理]