星载SAR通道幅度误差影响分析  

Impact Analysis of Channel Amplitude Error in Spaceborne SAR

作　　者：姜童[1] 黄普明[1] 贺亚鹏[1] 张欣[1] 

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2015年第4期35-39,共5页Space Electronic Technology

摘　　要：星载SAR系统雷达波形采用线性调频(LFM)信号。由于实际器件的非理想特性,LFM信号经过收发通道时会引入幅相误差。该文在分析通道幅度失真的基础上,深入探讨了LFM信号一次幅度误差、二次幅度误差、纹波幅度误差和随机幅度误差对LFM信号脉冲压缩波形的影响,并进行了计算机仿真。仿真结果验证了理论分析的正确性,对星载SAR通道误差分析及指标分解具有指导意义。Spaceborne SAR system uses Linear frequency modulation （LFM） signal as pulse compress waveform. Be- cause of the non-ideal characteristic of actual channels, it will lead to the amplitude and phase error in LFM signals when passing through the channels. On the basis of analyzing the cause of amplitude distortion in the channels, the impacts of pri- mary amplitude error, quadratic amplitude error, periodic amplitude error and random amplitude error on the pulse-compres- sion performance are investigated in detail. The computer simulation results are presented, which prove the corrections of the- oretical analysis, making an instructional meanings for the Spaceborne SAR channel error analysis and index decomposition.

关 键 词：星载SAR LFM信号 幅度失真 通道误差 

分 类 号：TN958[电子电信—信号与信息处理]