雷达BIT中信号检测与虚警抑制技术研究

Research on Signal Detection and False Alarms Decreasing in Radar BIT

在雷达信号优化检测的研究中,噪声干扰是雷达BIT系统产生虚警的重要因素,为降低噪声及在复杂的噪声中提取有用的信号,解决噪声干扰引起的虚警问题,在分析几种现代降噪方法的基础上,根据最大似然估计和广义似然比检测理论,提出了一种高斯包络线性调频自适应信号分解(AGCD)的广义似然比检测算法,在零均值、复高斯白噪声条件下具有恒虚警特性,解决了AGCD快速算法在噪声条件下的分解终止条件的阈值选择问题,可以用来对信号进行检测和降噪,有效抑制雷达BIT系统的虚警。仿真分析及结果说明了上述方法在信号检测虚警抑制方面的有效性。

Noise jamming is the important reason for the false alarms of radar BIT system. It is very difficult to reduce noise and detect effective signal in complicated noise environment. Aiming at this problem the paper put forward generalized likelihood ratio detection arithmetic based on the AGCD fast algorithm according to the maximum likeli- hood estimate and generalized likelihood ratio detection theory by analyzing several kinds of modern reducing noise methods. This method can solve the AGCD fast algorithm＇s resolving ending problem under the noisy environment. The algorithm has the characteristic of constant false alarm on the condition of zero - average and complex white Gaussian noise. The algorithm can be used to detect signals and reduce noises. So the false alarms of radar BIT sys- tem can be decreased effectively. The validity of the AGCD fast algorithm was certified with instances.