红外成象导引头作用距离估算

本文叙述具有自动目标识别功能的红外成象导引头的作用距离估算。这种估算方法既不同于非成象（点源）系统，也不同于一般热象仪。成象红外导引头的作用距离是一个有待研究的参数。然而，与此有关的主要问题仍然是系统的灵敏度（ＮＥＴＤ）、大气传输和从随机噪声中识别目标所需的信噪比。在湿热的大气环境条件下，水分子的吸收是决定大气传输的支配因素。系统工作信噪比与探测概率和虚警率相关。本文提出了定义成象红外导引头虚警的一种假设，并以此为依据推出一套估算作用距离的公式。最后给出了计算成象红外导引头作用距离的示例。

OPERATING DISTANCE ESTIMATE OF IMAGING INFRARED SEEKER

Operating distance estimate of imaging infrared (IIR) seeker with automatic target recognition function is described. The estimation method is nei-her similar to that of non-imaging (point source) IR seeker nor to that of generalthermal imagery. The operating distance of IIR seeker is a parameter to be studied However, the major problems associated with that are still sensibility of system(NETD), atmospheric transmission and signal noise ratio (SNR) needed for recogniting target from rondom noise. Molecular absoption of water (H_2O) is a dominatiVe foctor determinating atmospheric transmission under high tempera-ture and high humidity environment condition. The operating SNR is dependent on the detection probability and false-alarm rate of system. An assumption for de-fining false-alarm rate of IIR seeker is made and a set of formula for estimating Operating distance based on the assumption is derived.Finally, an example used to calculate the operating distance of IIR seeker is given.