通过机载试验 ,本文进行了W波段毫米波辐射计 (RADW92 )扫描成像研究 ,取得了黄河、渭河部分水域的微波辐射图像。试验结果表明 ,RADW92基本满足星载应用的要求。文中分析了影响图像质量的各种误差因素 ,并且提出了相应的解决方案。RADW92工作的中心频率为 92GHz ,带宽 2GHz ,积分时间 6 0ms ,系统灵敏度 0 6K ,线性度 0 999,天线为卡塞格伦 (Cassegrain)天线

Through the airborne experiment, a research on the W band Millimeter Wave Radiometer(RADW92) is introduced in this article. Microwave remote sensing images of parts of the Yellow River and the Weihe River were acquired, which were the first batch images produced from scanning W band Millimeter Wave Radiometer in China. The experiment shows that RADW92 is adequate for space use. The analysis of some factors influencing the image quality as well as the solutions to them are included in this article. The RADW92 works with operating frequency at 92GHz,the bandwidth 2GHz,the integration time 60ms, the system sensitivity 0.6K and the linearity better than 0.999. Cassegrain Antenna was designed for conical scanning and imaging. The two images presented in the paper are both original results without any correction. Compared to the reference map,both rivers on the images have the identical trends with the reference maps. The geometrical form of both rivers has distortion to some extent. Many reasons can result in the distortion including scanning track approximation,longitude and latitude approximation, altitude error, velocity and attitude approximation,etc. Moreover, the algorithm of software is also an important factor that affects image qualities. According to that,the observed data for spaceborne imaging should be matched with the parameters of the imaging platform for the geometrical correction.