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(Short-wave Infrared, SWIR)光谱分析的应用需求,本文提出了一种星用短波红外成像仪的设计方法。由于低轨卫星系统的抗总剂量辐射能力要求为20k Rad (Si)以上,因此,该方法首先筛选出抗总剂量辐射能力达到20k Rad (Si)的InGaAs焦平面探测器；然后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；最后应用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,短波红外成像仪抗总剂量辐射能力达到25k Rad(Si),动态范围≥61dB,非均匀性≤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, this paper proposes a design method for star short-wave infrared imagers. Since the anti-total dose radiation capacity of the low-orbit satellite system is required to be more than 20k Rad (Si), the method first screens the InGaAs focal plane detector with a total dose radiation resistance of more than 20k Rad (Si); Then the aerospace-level components are 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 is applied to achieve accurate temperature control of the imager, and the non-uniformity correction algorithm and image enhancement algorithm are 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 25k Rad(Si), a dynamic range of 61dB, and a non-uniformity of 1.9%, which meets the requirements of short-wave infrared spectroscopy detection of low-orbit satellites.