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通常,因空间飞行物,如人造地球卫星、弹道式导弹的弹头等都具有复杂的金属表面,所以这些目标的起伏特性是对数正态的。对数正态起伏特性可以用m(起伏随机变量X的中值)和ρ(X的均值对中值之比)来表述。对数正态起伏(LNF)和Chi-平方起伏(CSF)之间只有在ρ大于2时才有明显的差别。本文讨论了LNF目标的检测性能,并用数字计算机(DJS-6)以数字模拟方法得出这类目标在非参量检测器中的发现概率P_d。
In general, the aerodynamic characteristics of these targets are log-normal due to the complex metallic surfaces of spacecraft, such as artificial Earth satellites and ballistic missiles. Lognormal fluctuations can be expressed in terms of m (the median of the fluctuating random variable X) and ρ (the mean of X to the median). There is a clear difference between LNF and CSF only when ρ is greater than 2. In this paper, the detection performance of LNF targets is discussed and the probability of finding such targets P_d in non-parametric detectors is obtained by digital simulation using a digital computer (DJS-6).