摘要
利用Duffing振子对周期小信号的敏感性和对噪声免疫性来检测DSSS/BPSK信号平方变换后混在强噪声中的正弦信号。介绍了Duffing振子小信号检测技术,详细阐述了基于Duffing振子的信号检测方法,给出了扩频信号和Duffing振子策动力的相差与最低可检测信噪比之间的关系曲线及方程。仿真表明,该方法能检测到信噪比为-38.35dB的DSSS/BPSK信号。
Duffing oscillator has characteristic of sensibility to small periodic signals and immunity against noise. By making use of the characteristic, the sine signal is detected which derives from square transform of binary-phase-shift-keyed and direct-sequence-spread-spectrum （DSSS/BPSK） signal and is submerged in strong noise. Technique of Duffing oscillator small signal detection is introduced first. Then we expatiate on the detection method, and present relative curve and equation between minimum reachable signal to noise ratio （SNR） and phase difference of DSSS/BPSK signal and the reference signal of Duffing oscillator. The simulations show that DSSS/BPSK signal can be detected at SNR=-38.35dB by the method presented here.
出处
《电路与系统学报》
CSCD
北大核心
2009年第1期23-27,共5页
Journal of Circuits and Systems
