【摘要】 提出了一种适用于水声遥控引信的直接序列扩频(DSSS)调制方法,它是采用频移键控(FSK)对扩频序列进行调制,并采用了非相干解调,这简化了遥控引信中接收机结构。性能仿真和湖试数据分析表明,DSSS-FSK技术在多径传播的环境中具有良好的抗噪声性能。与采用FSK调制和纠错编码的方法相比,信噪比有明显的改善。更多还原

【Abstract】 A new direct-sequence spread spectrum(DSSS) encoding method for underwater acoustic remote fuze system is presented in this paper.Frequency-shift-keying is used to modulate the DSSS signal,and noncoherent demodulation is employeds which simplifies the structure of receiver.Numerical simulation and analysis of lake trial data show that the method has better noise-immunity performance in multipath channel.Compared with the system of FSK and errorcorrect encoding,the DSSS system with FSK modulation achieves significant signal-noise-ratio gain.更多还原