一种新的PRI变换分选算法

A New Algorithm of PRI Transform

脉冲重复间隔(pulse repetition interval,PRI)变换及其改进算法是雷达信号分选领域的经典算法之一。在早期的信号环境中,各部雷达信号的PRI值相对接近,传统的改进PRI变换算法能够有效地分选PRI抖动雷达信号,因而得到了广泛的应用。随着信号环境的日益复杂,不同雷达发射的信号其PRI值分布在一个较大的范围内,此时传统算法的分选能力大大减弱。针对上述问题,对传统算法中可变时间起点的改变、PRI箱的选择以及门限的确定三个方面进行改进,提出一种新的PRI变换分选算法。新算法中采用了可变的移动因子、固定的箱分辨率以及合理的门限,在保留原算法优点的同时,能够适应PRI值分布在较大范围内的抖动雷达信号分选问题,并通过模拟仿真验证了算法的有效性。

PRI Transform algorithm is one of the most classical methods in the radar countermeasure system. The traditional PRI Transform algorithm is capable of detecting several close jittered signals in a small PRI dynamic range. But its ability is seriously weakened by the wide dynamic range of PRIs in the complex signal environment. To solve the problem, this paper introduced a new algorithm of PRI transform, which use shifting mobility factor, constant bin resolution and a new efficient threshold for deinterleaving of radar pulses. The new approach can effectively sort complex radar-signals, whose PRIs are distributing in the wide dynamic range. Extensive Monte Carlo simulation results indicate the effectiveness of the algorithm.