针对机载光电系统理论与实际探测能力之间的较大差异及其作战能力发挥不充分等问题，分析得到了目标反射背景辐射的空间分布函数，并给出了具体量化方法，进而研究了目标本征辐射特性，建立了水平和俯仰面内的辐射强度包线模型；之后考虑各种作战因素，给出了机载光电系统角水平和角俯仰探测能力包线计算方程式；最后提出探测概率包线概念，得到了机载光电系统作用距离与探测概率关系，并定量分析了机载光电系统探测包线的概率特性。仿真结果表明，探测包线随目标速度、方位、俯仰的变化而实时变化；当满足一定的虚警概率和信噪比要求时，探测概率包线具有最佳探测点，这为充分发挥机载光电系统探测性能提供了理论参考。

Aiming at the big difference between theoretical and battlefield detection ability of airborne photoelectric system and the inadequacy of operation ability, the spatial distribution function of target reflective background radiation is obtained and the quantitative method is given. The target original radiation is studied and the models of level and pitch radiation intensity envelope are built. Considering the various operational factors, the equations of detection ability in level and pitching angle are given. The concept of detection probability envelope is put forward, and the relationship between operating range and detection probability is obtained and the envelope probability characteristic of airborne photoelectric system is analyzed quantitatively. The simulation results show that detection envelope changes with the change of target speed，azimuth and pitching angle. When meeting the demands of false alarm probability and signal noise ratio, the detection probability envelope has optimum detection point, which provides theoretical reference for developing the detection performance of airborne photoelectric system.