首先定义了一个描述目标被探测的难易程度(隐蔽度)的物理量——可测度。分析了目标飞行高度和速度变化对目标红外波段可测度的影响,在大量计算的基础上分析了上述影响和变化的规律性。分析结果表明,目标飞行马赫数每提高0.5,探测距离就能增加大约5 km;目标在8 km以下时,其可测度随高度增加而增大;在8~10 km高度时目标的可测度值达到最大;高度超过10 km后,其可测度随高度增加而减小。 First of all, a physical quantity describing how easy the target is to be detected (concealment) is defined - measurability. The influence of target flight altitude and velocity on the measurable target infrared band is analyzed. Based on a large number of calculations, the regularity of the above effects and changes is analyzed. The analysis results show that the detection range can be increased by about 5 km for every 0.5 Mach Mach and the measurability increases with the altitude when the target is under 8 km. The measurable value of the target at 8-10 km Reaches the maximum; when the height exceeds 10 km, its measurability decreases with the increase of height.