用循环自相关法分析和比较雷达信号的截获性能

本文针对循环自相关法等现代截获处理方法，从离散时间信号处理的角度，推导了截获接收机信号处理增益的表达式，在此基础上提出了一种基于循环自相关积累因子的雷达信号抗截获性能的分析与比较方法，首先用理论计算线性调频信号、二相编码信号和OFDM信号的自相关积累因子U值，然后在低信噪比的情况下对线性调频信号、二相编码信号和OFDM信号等大时间带宽积信号的抗截获性能进行了仿真分析和计算。理论分析和实验仿真结果表明，在高/中重频情况下OFDM脉冲信号具有相对较好的抗截获性能。 

The LPI Performance Analysis and Comparison of Radar Signals by Cyclic Autocorrelation Method

In this paper, for the modern intercept processing method such as cyclic autocorrelation method, the expression of intercept receiver signal processing gain was derived from the perspective of the discrete-time signal processing. The analysis and comparison method of anti-interception performance of radar signals was proposed based on cyclic autocorrelation accumulation factor. First，the value of cyclic autocorrelation accumulation factor U of Linear Frequency Modulation (LFM) signal, two-phase encoded signal and Orthogonal Frequency Division Multiplexing (OFDM) signal was calculated to analyze the anti-interception performance. Then, in order to analyze the anti-interception performance of large time-bandwidth product signals, Linear Frequency Modulation (LFM) signal, two-phase encoded signal and Orthogonal Frequency Division Multiplexing (OFDM) signal were used for simulations in the case of low SNR. The theoretical analysis and simulation results show that the High/Medium pulse repetition frequency OFDM signal has a relatively good anti-interception performance.