星用短波红外成像仪的设计与实现

Design and Implementation of Short-wave Infrared Imager for Satellite

摘要:

针对低轨卫星激光通信和大气层短波红外光谱分析的应用需求,设计并研制了一种星用短波红外成像仪。由于低轨卫星系统的抗总剂量辐射能力要求为20kRad(Si)以上,因此,该成像仪选用抗总剂量辐射能力达到20kRad(Si)的InGaAs焦平面探测器；采用宇航级元器件设计相应的时序驱动、温度控制、模数转换、图像传输、遥控遥测等硬件电路模块,组成成像仪硬件部分；应用PID温控算法实现成像仪精准控温,采用非均匀性校正算法和图像增强算法提升成像仪图像质量。经试验验证,研制的短波红外成像仪抗总剂量辐射能力达到25kRad(Si),动态范围大于等于61dB,非均匀性小于等于1.9%,满足低轨卫星短波红外光谱探测的要求。

Abstract:

Aiming at the application requirements of laser communication and atmospheric short-wave infrared (SWIR) spectroscopy of low-orbit satellites, a design method for star short-wave infrared imagers is proposed. Since the anti-total dose radiation capacity of the low-orbit satellite system is required to be more than 20kRad (Si), the method first screened the InGaAs focal plane detector with a total dose radiation resistance of more than 20kRad (Si). Then the aerospace-level components were used to design the corresponding timing drive, temperature control, analog-to-digital conversion, image transmission, remote control telemetry and other hardware circuit modules to form the hardware part of the imager. Finally, the PID temperature control algorithm was applied to achieve accurate temperature control of the imager, and the non-uniformity correction algorithm and image enhancement algorithm were used to improve the image quality of the imager. After test verification, the short-wave infrared imager has a total dose radiation resistance capacity of 25kRad(Si), a dynamic range greater than or equal to 61dB, and a non-uniformity less than or equal to 1.9%, which meets the requirements of short-wave infrared spectroscopy detection of low-orbit satellites.