关键词: 相关倍频累积, Duffing振子, 四阶累积量2-D切片, 载频, 功率, 码速率/副载频

Abstract: To solve the monitoring problem of the low signal-to-noise (SNR) and long pseudo-random code GPS military signals under the background of navigation warfare, a method adopting the relevant multiplier integration plus Duffing oscillator detection is proposed for fulfilling joint estimation of carrier frequency and power of the received GPS military signal. Through constructing Duffing oscillators array, the intermittent period and the maximum output amplitude of the intermittent chaotic oscillator are extracted to estimate the carrier frequency and power of the received GPS military signal. Furthermore, the fourth-order cumulant 2-D slice of the received GPS military signal is demodulated with the estimated carrier frequency, and through normalization, maximal peak searching and least square linear fitting with the demodulated result, the code rate and the subcarrier of the received GPS military signal are acquired. The simulation results show that the proposed method can well implement monitoring and parameter estimation of the received GPS military signal in the SNR range of -32 dB to -24 dB, and it is feasible to lead jamming.

Key words: relevant multiplier integration, Duffing oscillator, fourth-order cumulant 2-D slice, carrier frequency, power, pseudo-random code rate and subcarrier