一种用于深空探测的Chirp变换频谱分析仪设计与实现

根据深空探测对频谱分析仪抗辐射、高分辨率、低功耗的需求，研究一种基于Chirp变换的高分辨率频谱分析仪设计及其实现.利用中心频率为1GHz、带宽为400MHz、色散时间为10μs的声表面波滤波器，提出了一种模拟和数字相结合的高分辨率频谱分析仪设计方案，并搭建原理实验系统完成了实测验证，其分析带宽为400MHz，频率分辨率达到152kHz，功耗约为3.6W.分析了压缩线器件非理想特性对频率分辨率的影响，利用实测压缩线频率响应特性获得幅度和相位补偿曲线，对展宽线信号进行幅相失配补偿.仿真结果表明，该补偿方法可将频率分辨率提高至108kHz. 

Design and Implementation of a Chirp Transform Spectrometer for Deep Space Exploration

According to the demand of radiation resistance, high resolution and low power consumption for spectrometer in deep space exploration, the design and implementation of a high resolution spectrometer based on Chirp transform are studied. The key problem in the implementation of the high-resolution spectrometer based on a SAW filter with 1 GHz center frequency, 400 MHz bandwidth and 10 μs dispersion time are studied. The system is designed and built by the combination of analog method and digital method, and the basic functions of the spectrometer are realized. The bandwidth of the system is 400 MHz, the frequency resolution is 152 kHz and the power consumption is about 3.6 W. The influence of the nonideal behavior of the compressor device on frequency resolution is analyzed. Amplitude compensation curve and phase compensation curve are carried out based on frequency response characteristics of compressor device. The amplitude mismatch and phase mismatch of the signal generated by the expander are compensated. The simulation results show that the frequency resolution of the system after compensation increases to 108 kHz.