在红外跟踪过程中,因被跟踪的目标与探测器之间的距离是不断变化的,使探测器的输出信号幅度也不断变化。在其他条件不变的情况下,探测器的输出信号与目标距离的平方成反比,因而输出信号的变化范围往往在10~3倍以上,甚至达到10~4～10~6倍。在调幅系统中,一般对主放大器实施自动增益控制而达到所要求的动态范围。 In infrared tracking, the distance between the target being tracked and the detector is constantly changing, so that the amplitude of the detector’s output signal is constantly changing. In other conditions remain unchanged, the output signal of the detector is inversely proportional to the square of the target distance, so the range of the output signal tends to be more than 10 to 3 times or even 10 to 4 to 10 to 6 times. In the AM system, the main amplifier is generally implemented automatic gain control to achieve the required dynamic range.