On August 24th, the Beijing 3B satellite was successfully launched into orbit at the Taiyuan Satellite Launch Center. It is equipped with a Tianshu camera with a resolution of 0.5 meters. The payload was developed by the 508 Institute of the Fifth Academy of China Aerospace Science and Technology Corporation and will carry out the "Eye of Heaven" mission at an altitude of over 600 kilometers. This satellite mainly provides telemetry data services for land and resource management, agricultural resource investigation, ecological environment monitoring, and urban comprehensive applications.

Compared to the Tianzhu camera carried by the Beijing 3A satellite, the performance of the Tianshu camera is even higher, with a larger lens aperture and brighter brightness. It can recognize targets as small as 0.5 meters from thousands of miles away, making it a "thousand mile eye". Wang Jinqiang, the project manager of Tianshu Camera at 508 Institute of Aerospace Science and Technology Group Fifth Academy, introduced that the camera adopts an ultra long focal length optical lens, and the resolution has reached the highest level of commercial remote sensing in China at present. It can perform push scan imaging like a scanner, format imaging like a DSLR camera, and smoothly perform video imaging.However, in order to achieve stable high-resolution imaging at high altitudes, it is necessary to have extremely strong anti shake capabilities. The Tianshu camera is equipped with three sets of controllable actuating rods under its body, as if "suspended" on the satellite platform, effectively isolating the micro vibrations of the satellite's moving parts and achieving active stability and anti shake under real-time control of the attitude control system. By utilizing satellite attitude control capabilities, it can also "stare intently" and perform high-altitude "space live broadcasts" on targets.

The orbit of Beijing 3B satellite has increased by more than 100 kilometers compared to A satellite. Although it stands high, it can see wide and clearly. The camera has increased its focal length to accommodate higher orbits; Expanded the spectral range of panchromatic imaging, absorbed more spectral information, more conducive to color fusion images, and enriched color details; By increasing the aperture of the main mirror, the large aperture lens can further enhance the ability to collect light and improve resolution; The optical system has added distortion eliminating optical elements, further eliminating the residual distortion in the end.When assembling and adjusting precision aerospace optical lenses, the influence of gravity is crucial. Typically, the surface shape of a few tens of wavelengths caused by gravity can lead to assembly failure. In order to ensure the assembly safety of the "Thousand Mile Eye", the development team has also explored world-class vertical adjustment technology, which enables the adjustment of high-quality lenses to overcome the influence of ground gravity.The Tianshu camera also has a smarter "brain", which adopts a large number of advanced intelligent chips, greatly improving the level of intelligence and autonomy. It uses the same high-performance CPU as the satellite "brain" to achieve intelligent optimal imaging parameters, making shooting easier and having self correction capability. The camera can also automatically focus, allowing for clear focus on targets ranging from tens of kilometers to deep space objects billions of kilometers away. The highway for data transmission is also constantly expanding, with speeds more than twice as fast as the Tianyu camera.

Source: Beijing Daily