[ Instrument Network Instrument Development ] Recently, at the 3rd Aerospace Navigation Industry Development Forum held in Hunan Province, the 508 Institute of Aerospace Science and Technology Group exhibited two new detectors independently developed, marking the visible light in China's space remote sensing field. The detector has entered a new phase.
It is reported that the two detectors developed by the institute are not only the longest detectors in the world, but also the size, weight and power consumption of the detector circuits are greatly reduced. The performance indicators have reached the world's leading level, breaking the country's continuous In the backward situation of high-performance image detector research and development capabilities, the high-end image detector is completely autonomously controllable.
In the vast universe outside the earth, remote sensing satellites play the role of â€œhigh-definition, far-sightedâ€ â€œeyesâ€, and do their due diligence for agricultural estimation, marine monitoring, environmental monitoring, meteorological observation, disaster prevention and mitigation, and national defense construction.
The detector is equivalent to the "retina" of the "Eye of the Sky" and is the core device of the remote sensing satellite. The light, machine, electricity and other components of the remote sensing camera must be designed with the detector.
Remote sensing satellites need to maintain a flight speed of approximately 7 kilometers per second in order to ensure that they do not â€œfallâ€ in low-earth orbits hundreds of kilometers above the ground. In this case, the optical signal received by the satellite camera will be weak, and it is necessary to use the time delay integration technique to image multiple exposures of the same scene.
At present, the mainstream detector used in remote sensing cameras is a TDI-capable TDI-CCD. With the development of semiconductor chip technology and the performance of CMOS process detectors, CMOS detectors have completely replaced CCDs in commercial and residential fields.
As the main force unit in the field of space optical remote sensing in China, 508 has used detector technology as one of the core technologies of the institute in recent years, and has invested a lot of resources in the research and development of advanced detector technology.
After more than three years of independent research and development, the institute has finally developed a world-leading TDI-CMOS detector.
It is understood that the TDI-CMOS detector is highly integrated, which can greatly reduce the size, weight and power consumption of the remote sensing camera. It has large dynamic range, high responsiveness, high signal to noise ratio, low background noise and consistent light response. Good sex and other advantages.
At the same time, with the increasing and controllable voices, the 508 detector technology has been upgraded to the level of survival and development, and the idea of â€‹â€‹â€œplanning and re-developmentâ€ has been adopted. At present, a spectrum product series has been initially formed. .
In subsequent applications, TDI-CMOS detectors will play a major role in space remote sensing such as high-resolution Earth observation, deep space exploration and astronomical observation.
â€œUsing traditional detectors, a detector needs to be equipped with multiple boards such as power supply boards, signal driver boards, and signal processing boards.â€ Chen Ruiming, head of the 508 detector technology laboratory, said, â€œIf satellites are installed, we will develop them. With this new detector, one board can replace all previous boards, and the functions implemented on multiple boards are integrated into the new detectors, while eliminating the transmission cables between the boards. In this way, the detector not only meets the trend of light weight reduction, but also saves the cost of the whole star, and improves the overall reliability of the system, making the imaging effect more ideal.
At present, the two detectors developed by 508 have high technical maturity and passed the reliability test of various simulated space environments including anti-irradiation to meet the high reliability and long-life requirements of aerospace products. .
It is reported that the new detector has been mass-produced and applied to the development of flight products for remote sensing satellite models.
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