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本文介绍了几种恒虚警处理技术,对参量法,着重介绍了单元平均和对数单元平均恒虚警处理;对非参量法,着重介绍了修正了的广义符号检验法(MGST)。叙述了它们的原理,实现框图,并对有关的性能进行了一些比较。对于杂波的统计特性,在一开头也作了简单介绍。雷达要在杂波中检测信号,由于地物、雨云、箔条等干扰的存在,会使虚警大大增加。要实现信号自动检测,雷达就必须在各种不同的背景干扰中使虚警率保持在可允许的范围以内,否则计算机就会过载而无法工作。因此,自动检测雷达必须具备恒虚警(CFAR)性能,CFAR 处理技术也可以改进现有雷达的性能,使之在强杂波干扰下仍能继续工作。所谓 CFAR 处理技术,就是要在各种不同的杂波环境下,使虚警概率保持在一个恒定的范围内,关于这方面的文献资料很多,这里简单介绍几种 CFAR 处理技术,并对它们的检测性能作一些比较,在这以前,关于杂波的统计特性也作一些简单的介绍。
In this paper, we introduced several techniques of constant false alarm, and introduced parametric method, and introduced averaged unit of averaging and logarithmically unitary constant false alarm. For non-parametric method, the modified generalized sign test (MGST) was introduced emphatically. Described their principles, the realization of the block diagram, and some of the performance comparison. For the statistical characteristics of clutter, at the beginning also made a brief introduction. Radar to detect the signal in the clutter, due to the presence of objects, rain clouds, chaff and other interference, will greatly increase the false alarm. To enable automatic signal detection, the radar must keep the false alarm rate within the allowable range for a variety of different background disturbances or the computer will overwork and fail to function. Therefore, automatic detection of radar must have CFAR performance, CFAR processing technology can also improve the performance of the existing radar, so that it can continue to work under strong clutter interference. The so-called CFAR processing technology, is to a variety of different clutter in the environment, the false alarm probability to maintain a constant range, a lot of literature on this area, here is a brief introduction of several CFAR processing technology, and their Some comparison of the detection performance, before this, the statistical characteristics of clutter also make some simple introduction.