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.