高阶量化数字相关辐射计的采样率要求

Sampling Rate Requirement of High-Level Quantization Digital Correlation Radiometer

通过对不同采样率情况下高阶量化数字相关辐射计的相关值测量结果进行分析,研究了此种辐射计的采样率要求。结果表明采样率并不需要满足奈奎斯特率,相关值的方差取决于互不相关的采样点个数。利用8mm波段综合孔径微波辐射计原理样机中的相关辐射计单元进行了不同采样率情况下的相关值测量实验,验证了分析结果。

The sampling rate requirement of high-level quantization digital correlation radiometer is investigated by analyzing the correlation measured with different sampling rates. The results shows that the sampling rate of high-level quantiza- tion digital correlation radiometer does not need to satisfy the Nyquist sampling theorem, the variance of the correlation de- pends on the number of uncorrelated samples. Using a correlation radiometer of an 8ram band synthetic aperture microwave radiometer prototype, the experiment to measure the correlation with different sampling rates is carried out, which demonstrates the analysis.