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提出了对空中点目标进行被动测距的方法。基于红外辐射在大气中的传输规律和红外成像系统的特性,建立了目标和背景的表观对比度模型。通过对两个波段上对比度模型的分析,推导出了测距公式和距离分辨率公式。理论分析表明,只要得到大气在两个波段上的消光系数,通过测量目标在两个波段、两个时刻上的目标表观对比度,即可计算得到目标距离和目标径向速度,而距离分辨率则取决于系统的对比度探测能力及相关参数。利用所得公式计算了不同气象条件下,目标距离分辨率与目标距离之间的关系。计算结果表明,该测距方法具有工程应用价值。
A method of passive ranging of air-to-air targets is proposed. Based on the transmission law of the infrared radiation in the atmosphere and the characteristics of the infrared imaging system, an apparent contrast model of the target and the background is established. Through the analysis of the contrast model in the two bands, the ranging formula and distance resolution formula are deduced. The theoretical analysis shows that as long as the atmospheric extinction coefficient in two bands is obtained, the target distance and the target radial velocity can be calculated by measuring the target apparent contrast of the target in two wave bands and two moments, and the distance resolution It depends on the system’s contrast detection capabilities and related parameters. The relationship between the target distance resolution and the target distance under different meteorological conditions was calculated using the obtained formula. The calculation results show that this method has engineering application value.