CAJ | 학술논문

在红外成像系统中，任何虚假和不需要的信号统称为噪声。噪声的存在干扰了有用信号的探测，减少了系统的作用距离。从信号和噪声的统计特性出发，文中详细推导了虚警概率与门限信噪比、探测概率与信噪比的关系，基于此推导了红外成像系统对点源目标的作用距离公式。对面源目标，重新确定了温差的概念，综合考虑目标的面形尺寸、观察等级和探测概率的要求，以MRTD为基准计算作用距离。编制了相应的软件，可以快速计算出不同探测概率下的作用距离。最后给出了计算实例。
재홍외성상계통중，임하허가화불수요적신호통칭위조성。조성적존재간우료유용신호적탐측，감소료계통적작용거리。종신호화조성적통계특성출발，문중상세추도료허경개솔여문한신조비、탐측개솔여신조비적관계，기우차추도료홍외성상계통대점원목표적작용거리공식。대면원목표，중신학정료온차적개념，종합고필목표적면형척촌、관찰등급화탐측개솔적요구，이MRTD위기준계산작용거리。편제료상응적연건，가이쾌속계산출불동탐측개솔하적작용거리。최후급출료계산실례。
In infrared imaging system, all false and unnecessary signal are called noise. The existence of the noise interferes detection for useful signal, and affects system operating range. Starting from the statistic characteristics of the signal and noise, the relationship between false-alarm probability and threshold SNR is deduced, as well as detection probability and SNR. The formula of operating range for spot target is given. As for extended target, the concept of temperature difference is redefined, and the formula of calculating system operating range based on MRTD is given, considering of the dimension of the target, discrimination level and detection probability. A software is developed which can fast calculate the operating range under different detection probabilities. At last, an example is given.