对于热辐射目标的红外系统的探测和跟踪性能主要受到两种噪声源的限制:即1)内部噪声如探测器或颤噪声;2)外部噪声或背景不均匀辐射分布引起的杂乱回波噪声。这两种噪声都使目前的系统达不到受背景噪声限制的最终灵敏度极限。但在绝大多数实际情况中,后一种噪声尤为严重,但也有例外,即在暗道中测量时能达到系统噪声限制的灵敏度而在自然背景中只能接近。由于这种原因,设计红外探测系统对于杂乱回 The detection and tracking performance of the infrared system for thermal radiation targets is mainly limited by two noise sources: 1) internal noise such as detector or chatter noise; 2) noisy echo noise due to external noise or uneven radiation distribution in the background. Both of these noises make the current system less than the ultimate sensitivity limit that is limited by the background noise. However, in the vast majority of practical cases, the latter noise is particularly serious, with the exception that the sensitivity of the system noise limit measured in the underpass can only be approximated in the natural context. For this reason, designing infrared detection systems for messy backs