机载红外搜索跟踪系统探测性能评测标定

Evaluation and calibration of operational capability to airborne IRST system

针对机载红外搜索跟踪系统(Infrared Search and Track,IRST)理论与实际战场探测能力之间的较大差异,提出了IRST系统探测性能评定的方法。对机载红外探测系统探测性能指标进行理论分析,选取探测点源目标的噪声等效辐照度作用距离模型进行分析改进;探讨作用距离与探测概率之间的关系;根据IRST系统工作方式,推导出系统物理扫描概率和目标发现概率计算公式;分析目标发现概率与系统作用距离以及载机速度之间的关系;搭建双余度反馈IRST系统探测概率测试平台,制定实验评测步骤,提出一种对探测系统性能进行评估的方法,该方法简单可靠。仿真实验结果表明,满足一定的探测概率下,系统作用距离极限可达到60km;通过半实物仿真平台的测试,实验结果较好地验证了所建模型的合理性。

Due to the difference between theory detection and in-battlefield detection ability of airborne IRST （ Infrared Search and Track ） system, the method of evaluation for detection system was put forward. Firstly, the theory aiming at operational capability of airborne infrared detection system was analyzed, especially the betterment of NEFD （Noise Equivalent Flux Density） operating range model, and the analysis of functional relationship between operating range and detection probability. According to the operation mode of IRST system, the computational formula of physical detection probability and target identification probability was deduced, and the target identification probability changing with operating range as well as speed was analyzed. Finally, the test platform of IRST system detection probability was set up and the experimental evaluation steps were made, and a simple and reliable method of evaluation and calibration was proposed. Simulation result shows that the operation range limitation of IRST system can reach 60km. Testing by semi-physical simulation,the rationality of the model is verified through the experimental conclusion.