基于锁相环的水听器阵列多传感器高精度同步技术

针对水听器阵列中多个传感器采集信号的同步问题,提出了一种适合于水听器阵列结构特点的高精度同步方法。该方法采用两级同步的方式:首先运用锁相环技术,保证同一个节点内多个传感器之间的同步采集;然后采用传输延时补偿的方法来补偿不同节点间的传输延时所引起的同步误差,实现节点之间的高精度同步采集。建立了一个实验系统:它由一个主节点和两个从节点组成。测试结果表明,同一节点内的同步采集误差不大于5 ns,不同节点间的同步采集误差不大于10 ns。对样机系统进行了进一步测试,测试结果与实验系统的测试结果一致。测试结果表明,该方法能实现水听器阵列多传感器间的高精度同步采集。

High-precision synchronization acquisition for multiple sensors of hydrophone array based on phase locked loop

This paper proposed a high-precision synchronous method, which was suitable for the structural characteristics of the hydrophone array and used to handle the acquisition synchronization problems among multiple sensors in the hydrophone array. The method used two-stage synchronization techniques. First, in order to achieve synchronous acquisition among multiple sensors within the same node, it used the phase-locked loop technology. Then, it adopted a transmission delay compensation method which could compensate the synchronous error to attain high-precision synchronous acquisition between the different nodes. It set up an experimental system which consists of one master node and two slave nodes. The test results show that the synchronous acquisition error within the same node is no more than 5 ns and the synchronous acquisition error between the different nodes is no more than 10 ns. Then, the prototype system is further test, and the test results are consistent with the test results from the experimental system. Therefore, the proposed method can achieve high-precision synchronous acquisition among multiple sensors in hydrophone array.