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成像微波散射计是增加了成像功能的新型散射计系统,其后向散射系数的测量精度仍然是系统的关键指标。根据成像微波散射计的系统特点,提出了基于FFT对信号与噪声进行同时测量的数字处理系统,推导了适用于衡量成像散射计后向散射系数测量精度的归一化标准差Kp。对于不同观测条件下的Kp进行了公式描述及数值仿真。得出不同区域和不同目标观测情况下如何配置系统参数的结论,并落实到成像散射计系统的性能分析中,对如何折衷设计性能参数并在实验过程中获取最佳试验结果进行理论指导。
Imaging Microwave Scatter is a new type of scatterometer system that adds imaging capabilities. The measurement accuracy of backscatter coefficients remains a key indicator of the system. According to the characteristics of the imaging microwave scatterometer, a digital processing system based on FFT for simultaneous measurement of signal and noise is proposed, and the normalized standard deviation Kp suitable for measuring the backscatter measurement accuracy of the imaging scatterometer is deduced. Kp for different observation conditions were described and numerical simulation. The conclusion of how to dispose the system parameters under different area and different target observation is obtained, which is implemented into the performance analysis of the imaging scatterometer system. The theoretical guidance is given on how to compromise the design performance parameters and obtain the best experimental results during the experiment.