点目标成像红外遥感器探测信噪比测试研究

Study of testing the detecting SNR of point target imaging infrared remote sensing systems

针对遥感器真空低温测试需求,设计并搭建了一套能够在低温真空环境中稳定工作的红外目标背景模拟器,模拟器主要由冷光阑、真空低温面源黑体、三维电移台三部分组成,冷光阑模拟探测背景,冷光阑上分布微孔用于模拟探测点目标。通过有效控制目标模拟器与背景模拟器间的隔热、控温以及背景模拟器与待测遥感器之间的隔热,实现稳定测试。另外,将仿真优化与实践经验相结合,通过仿真计算去除模拟器冷光阑板厚度、目标相位、平行光管等的影响,有效降低系统测量不确定度。文中的仿真分析方法和验证情况对于红外遥感器点目标探测信噪比检测试验具有参考意义。

According to the vacuum and cryogenic test requirements of remote sensors,a set of infrared target background simulators that could work stably in low temperature and vacuum environments was designed and built.The simulator is mainly composed of cold diaphragm,vacuum and low temperature surface source blackbody and three-dimensional electric moving table.The cold diaphragm simulates the detection background,and the micro holes distributed on the cold diaphragm are used to simulate the detection point targets.By effectively controlling the thermal insulation and temperature control between the target simulator and the background simulator and the thermal insulation between the background simulator and the remote sensor to be tested,the stable test is realized.In addition,combining simulation optimization with practical experience,the influence of the thickness of the cold stop plate,the target phase and the collimator of the simulator is removed through simulation calculation,which effectively reduces the measurement uncertainty of the system.The simulation analysis method and the verification results in this paper have reference significance for the detection experiment of signal-to-noise ratio of infrared remote sensor point target detection.