相干干扰下窄带信号检测统计处理与阵列处理的一致性研究

发布时间：2018-04-04 19:55

本文选题：相干干扰　切入点：窄带信号　出处：《西北工业大学学报》2014年01期

【摘要】：针对使用均匀线列阵时相干干扰背景下窄带信号的检测问题,理论证明了分别从统计信号处理和阵列信号处理角度提出的准最佳检测器之间的一致性,并将从统计信号处理角度推导得到的检验统计量所服从的统计分布中含有的非中心参量与阵列处理中阵增益联系起来,建立了2种信号处理方式中参量之间的相互关系。通过计算机仿真研究了2种检测器的检测性能,仿真结果验证了2种检测器一致性的结论。针对不同的阵元个数以及目标方位(干扰方位固定),研究了该检测器的检测性能,得到了如下结论:(1)对于给定的干扰方位,当目标信号由其临界区间内入射(由上下临界值构成)时,随着目标信号逐步靠近干扰信号,检测概率将逐渐下降;若由该区域外入射时,检测概率将保持相对稳定。同时,本文给出了针对均匀线列阵目标方位临界值的计算公式;(2)当均匀线列阵阵元个数较多时,目标与干扰可以比阵元个数较少时更为接近而不至于损失检测性能。
[Abstract]:Aiming at the problem of detecting narrowband signals under coherent interference background using uniform linear array, the consistency of quasi-optimal detectors proposed from the angle of statistical signal processing and array signal processing is proved theoretically.The noncentral parameters in the statistical distribution derived from the statistical signal processing are related to the array gain in the array processing, and the relationship between the parameters in the two signal processing methods is established.The detection performance of the two detectors is studied by computer simulation, and the results of simulation verify the consistency of the two detectors.For different array elements and target azimuth (interference azimuth fixed), the detection performance of the detector is studied, and the following conclusion is obtained: 1) for given interference azimuth,When the target signal is incident within its critical range (consisting of the upper and lower critical values), the detection probability will gradually decrease with the target signal approaching the interference signal, and the detection probability will remain relatively stable when the target signal is incident from outside the region.At the same time, the formula for calculating the critical value of target azimuth of uniform linear array is given in this paper. When the number of elements of uniform linear array is more, the target and interference can be closer to each other than when the number of array elements is smaller, and the detection performance will not be lost.
【作者单位】：西北工业大学航海学院;
【基金】：国家自然科学基金(11274252) 2012届西北工业大学本科毕业设计重点扶持项目资助
【分类号】：TN911.23

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