Because infrared sensor is easily affected by atmosphere hot radiation, long distance and sensor noise, the detected targets in infrared images often present like dim targets and drowned in noise.

• 红外传感器受到大气热辐射、作用距离远以及探测器噪声等因素的影响，探测到的目标在红外图像上多呈现为对比度低的弱小目标，并且淹没在噪声中。