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对用作探测和自动跟踪之被动红外系统来说,考虑到减少捕获移动目标的误差、跟踪用误差信号的产生和系统响应慢等问题,要有一个比目标宽的瞬时视场。但是,瞬时视场加宽又导致所吸收的目标背景(天空或山林)辐射能增加,从而降低了系统输出的信噪比。空间滤波器是用来改善信噪比特性的,这时,瞬时视场有些什么问题还不清楚。
For passive infrared systems used for detection and tracking, taking into account the issues of reducing the error of capturing moving targets, generating tracking error signals and slowing the system response, an instantaneous field of view must be wider than the target. However, the broadening of the instantaneous field of view leads in turn to an increase in radiated energy of the absorbed target background (sky or mountain), thereby reducing the signal-to-noise ratio of the system output. Spatial filter is used to improve the signal to noise ratio characteristics, then, what are the transient field of view is unclear.