183.31 GHz二单元干涉仪实验研究

干涉综合孔径技术的应用使得辐射计有效解决了实孔径分辨率低、星载天线机械扫描技术困难等一系列问题。183.31 GHz干涉式综合孔径辐射计对于大气水汽的垂直分布探测、强降雨探测以及云中液态含水量探测等具有重要作用,为数值天气预报提供重要参数。以验证183.31 GHz全尺度样机原理功能为目的,研制了183.31 GHz二单元干涉仪,并给出了功能性测试结果。

Research on Experiment of 183.31 GHz Interferometer with Two Elements

Interferometric synthetic aperture radiometer is an attractive conception that uses Fourier synthesis to achieve high spatial resolution avoiding the disadvantages of manufacturing and carrying large antennas.183.31 GHz Interferometric aperture synthesis radiometer will play a significant role in detecting the vertical distribution of atmospheric water vapor,heavy rainfall and cloud liquid water.It makes great sense to provide important parameters for the weather prediction as well.This paper has discussed the analysis of interferometry model and design of the 183.31 GHz interferometer system with two elements.And then two main important tests like simulated point target interferometry and point target interferometry at various angles to get functional verification of the full-scale system are presented.Simulated point target interferometry experimental result which illustrates that the measured amplitude of visibility function is the same,and the results distribute on a round show good stability,which is crucial for a full-scale system.Point target interferometry at various angles shows that real and image parts of the complex visibilities are very close to the expected ideal orthogonal sinusoids.The relationship between baseline length and the real and image parts of the complex visibilities curve frequency is linear which verifies that visibility function and modified brightness temperature is Fourier transform pair alike.