用于深空探测的400MHz带宽Chirp变换谱分析仪的设计与实现  

High Resolution Design and Realization of 400MHz Bandwidth Surface Acoustic Wave Chirp Transform Spectrum Analyzer for Deep Space Exploration

作　　者：茹鹏磊 刘梦伟[1] 宫俊杰[1] 王文[1] 朱皓天 朱迪 董晓龙 RU Penglei;LIU Mengwei;GONG Junjie;WANG Wen;ZHU Haotian;ZHU Di;DONG Xiaolong(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049;National Space Science Center,Chinese Academy of Sciences,Beijing 100190)

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100049 [3]中国科学院国家空间科学中心,北京100190

出　　处：《空间科学学报》2022年第5期991-1003,共13页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(U1837209)。

摘　　要：Chirp变换频谱仪(CTS)具有低功耗、高稳定性等优点,在深空探测领域中具有独特的优势。罗塞塔(Rosetta)彗星探测器搭载的180 MHz带宽Chirp变换频谱分析仪,是迄今为止唯一成功完成空间任务的后端外差式实时频谱分析仪。基于Chirp变换谱分析的原理,设计构建了数字展宽线技术与声表面波压缩线技术相结合的400 MHz带宽Chirp变换谱分析仪。完成了数字展宽线与模拟声表面波压缩线的优化匹配设计,使系统的分辨率达到了理论值100 kHz。进一步采用调频信号和多频率点信号对CTS系统进行了测试验证。Chirp Transform Spectrum analyzer(CTS)has the advantages of low power consumption and high stability,and has unique advantages in deep space exploration.The 180 MHz bandwidth chirp transform spectrum analyzer mounted on the Rosetta comet detector is the only back-end heterodyne real-time spectrum analyzer that has successfully completed space missions so far.Based on the principle of chirp transform spectrum analysis,a 400 MHz bandwidth Chirp transform spectrum analyzer was designed and built by combining the digital expander technology with the Surface Acoustic Wave(SAW)compressor technology.By analyzing the compression results in the frequency band,the phase difference between the expander and the compressor was introduced as an important factor affecting the compression waveform.According to the two key parameters of the pulse compression waveform,the main lobe width and the peak side lobe ratio,the optimal matching design of the digital expander and the analog SAW compressor are completed.The compression result of the system is optimized,so that the resolution of the system reaches the theoretical value of 100 kHz.FM signal and multi-frequency signal are used to test and verify the CTS system.

关 键 词：深空探测 CHIRP 变换 频谱仪 高分辨率 超宽带 声表面波 

分 类 号：P412[天文地球—大气科学及气象学]