An integrate quadratic phase function based signal detection and parameter estimation algorithm is proposed to investigate the interception problem of polyphase codes. P1, P2 , P3, P4, and Frank, referred to as frequency-derived codes, which are widely used in low probability of intercept radar applications. The polyphase-coded signal's quadratic phase function has its energy concentrated along a ridge that runs parallel with the axis of time, which is used by the integrate quadratic phase function to detection the signal. The sweep rate estimates can be obtained as a byproduct of the detection algorithm. The detection performance is evaluated by using the output signalto-noise ratio. the receiver operating characteristics graphs, and the detection performance graph. The computer simulations are used to evaluate the parameter estimation performance of the proposed algorithm.%针对低截获概率雷达中常用的一类由频率导出的多相编码信号(P1、P2、P3、P4及Frank码)的截获问题,研究了基于积分二次相位函数的检测与参数估计方法.该方法利用此类多相编码信号的二次相位函数在时间一调频率平面仅为一条平行于时间轴直线的特点,通过积分二次相位函数获得能量积累,完成信号检测的同时实现了信号调频率参数的估计.分析了检测统计量的输出信噪比性能,给出了算法的接收机工作特性曲线和检测性能曲线,仿真分析了算法的参数估计性能.
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