CTS 在行星和彗星大气观测中的应用研究

来源 :2016中国地球科学联合学术年会 | 被引量 : 0次 | 上传用户:gx2784500
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当前CTS的性能也受SAW器件性能的局限,如SAW的插入损耗,色散效应,带宽和频率限制。为了进一步提高测量精度和测量带宽,CTS中也开始使用性能优良的数字器件,如使用DDS芯片生成带宽更宽,持续时间长的Chirp信号;生成预失真的Chirp信号以修正系统中的非线性失真误差。现有DDS数字芯片可生成1GHz带宽的线性Chirp信号随着数字器件水平的提高,采用高采样率的ADC芯片,高速的FPGA芯片,并行计算的GPU芯片和大容量存储芯片等,能实现GHz量级的射频采样和FFT处理。基于数字器件实现的FFT频谱仪在带宽和精度上已超过CTS,但在功耗,稳定性,可靠性和实时性上差于CTS。我国也将开展火星和彗星的探测,需要大气观测方面的技术储备。
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