What are the difficulties in using Resources-3 series satellites as surveying and mapping satellites?

On July 25th 1 1 hour 13, the resource-3 03 satellite was successfully launched in Taiyuan Satellite Launch Center, and will form a three-dimensional mapping satellite constellation with other mapping satellites such as resource-3 0 1 02. This is the first time that China has developed a surveying and mapping satellite, and the research and development from scratch has greatly enhanced China's national strength again. The development of surveying and mapping satellites is very difficult for the following reasons. All parameters of China Resources-3 satellite were designed from scratch. At first, we will buy some data from abroad, but if we want to develop our own satellites, we must use our own data parameters. Therefore, after four years of experiments, you have determined the technical support and required materials for manufacturing satellites, and finally set up a project and started research and development. The first problem to be solved is hardware. China has basically possessed the capability of launching satellites, but the photographic equipment of surveying and mapping satellites must be re-developed in China. Surveying and mapping satellites can measure the elevation, which is impossible for ordinary rocker equipment. Therefore, China spent three years and experienced numerous experiments, and finally made a camera with good dynamic range and very accurate image conversion rate, which does not deform in the environment with large temperature changes. But this is also the first step for China to develop surveying and mapping satellites.

The most difficult thing for accurate positioning of surveying and mapping satellites is how to reduce the error between the shooting area and the field. Satellites need to acquire image data perfectly, and at the same time, convert the image data into coordinates and send them back together. Recently, I also worked as an intern in supmap, using American GPS to accurately locate a place on the earth. It is very difficult for us to learn this software, let alone redevelop it and get more accurate data. At the same time, surveying and mapping satellites need 3D stereoscopic images, and scientists even spent a year measuring the altitude, especially in some mountainous areas and forests.

It is really difficult to learn surveying and mapping satellites. Thanks to the continuous efforts of scientists, I hope that scientists can build more powerful satellites in the future and enhance China's comprehensive scientific and technological strength. ?