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针对线性调频信号同步相关的旁瓣、m序列扩频同步的序列自噪声和二进制相移键控调制信号在主瓣周围一个码片范围内存在较强烈的旁瓣三个问题,提出了一种基于二进制偏移载波(BOC)调制信号的无干扰窗水声同步方式.利用互补序列的非周期自相关函数之和为零的特殊性质,实现了在主瓣周围一个码片范围外,零相关窗范围内的无干扰窗.使用BOC(1,1)方式对信号进行亚载波调制,以减少主瓣周围一个码片范围内的旁瓣.对单通道信号和双通道信号的零相关窗形式都进行了设计,通过仿真和实验验证了BOC零相关窗方法在水声系统的同步、信道测量和估计中的有效性.
In order to solve the three problems of the side lobe, the serial self-noise of the m-sequence spread spectrum synchronization and the side-lobe of the binary phase-shift keying modulated signal in the range of one chip around the main lobe, Based on the BOC modulated signal, a non-interference window-water acoustic synchronization method is proposed. By using the special property that the sum of the non-periodic autocorrelation functions of the complementary sequences is zero, a zero correlation is achieved outside the range of one chip around the mainlobe Window without interference window. The signal is subcarrier modulated using the BOC (1,1) method to reduce the sidelobes within a chip range around the main lobe. The zero-correlation window format for single-channel and dual-channel signals Are all designed. The validity of BOC zero correlation window method in the synchronization, channel measurement and estimation of underwater acoustic system is verified by simulation and experiment.