摘要
卫星调制传递函数(MTF)的在轨测试是监测卫星平台及其遥感器在轨运行情况和性能衰减程度的有效手段。本文针对北京一号小卫星多光谱相机,研究利用边缘地物法进行MTF在轨监测,并基于MTF测试结果,采用维纳滤波法对北京一号小卫星多光谱图像进行复原。结果表明NW向和NE向两个方向的MTF差别不大,在这两个方向上LSF的半带宽分别为3.75和4.35个像元。根据所计算得到的MTF值对图像进行复原可以明显提高北京一号小卫星图像清晰度以及边界信息。
The proprietorship of the Beijing-1 satellite, which participates in international satellite constellation network, totally belongs to Beijing, China. Compared with other satellites of our country, this micro-satellite has its own characteristics and operation manner. On-orbit evaluating and monitoring the MTF of the optical system is beneficial for both troubleshooting and developing improved designs of future payloads. And moreover, the MTF itself can be used in some image enhancing techniques. In this paper the MTF was determined for multispectral imaging spectrometer of Beijing-1 satellite using the edge response function. Based on the results of MTF, the images that have been degraded by the limited resolution of the sensor as well as by the presence of noise were recovered using the Wiener filter in the frequency domain. The results showed that the MTF values of NW and NE directions were very similar. The Full-Width at Half-Maximum （FWHM） of LSF, which stands for blurring width, was 3.75 和 4.35 for NW and NE directions, respectively. The image quality, such as the sharpness and interpretability of the imagery was evidently improved through the restoration processes.
出处
《遥感信息》
CSCD
2007年第3期49-53,I0002,共6页
Remote Sensing Information
基金
中国博士后科学基金(20060390537)
中科院百人计划项目资助
中国科学院王宽诚博士后工作奖励基金
