...信号瞬时混合的情况，已提出基于高阶统 计特性（HOS，High Order Statistics）和基于二阶统计特性（SOS, Second Order Statistics） 的方法[1-4]。
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对界面反射超声散斑场的一阶统计特性进行了理论和实验分析。
The first order statistical properties of the ultrasonic speckles reflected from an interface is analyzed theoretically and experimentally.
第二、穿过随机电离层卫星信号二阶统计特性和电离层信道统计特性研究。
Second, the second-order statistical characteristics of satellite signals propagating through the turbulent ionosphere and properties of the ionospheric channel are also studied.
提出了一种基于图像一阶、二阶统计特性的自适应可见光图像对比度增强方法。
Based on the first and the second order of image statistics characteristics, the adaptive visible image contrast enhancement method is presented.
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