【摘要】 针对海洋水声探测时水听器间的数据采集同步问题,提出了一种全阵列精确同步的采集时钟产生与传递方法。采用独立的高精度主时钟、异步差分传输线和从时钟端的锁相环(PLL),实现了多节点长时间不间断工作方式下的同步采集,具有抗干扰能力强、同步性能好的特点。建立了时钟同步模型,详细分析了同步延迟的产生环节。通过电路实验验证了整个方案的可行性,在经过长度为18 m的非屏蔽双绞线传递后,恢复的从时钟延迟不大于165 ns,且与距离成线性正比关系。所提方法已经用于实际的水听器阵列数据采集系统,取得较好的效果。更多还原

【Abstract】 The paper proposed a precise full-array-synchronization data acquisition clock generation and transmission method to handle the hydrophone’s data acquisition synchronization problem in the ocean underwater acoustic detection.By using the independent high-precision clock source and asynchronous differential transmission lines,the long distance synchronous acquisition of the hydro-phone’s array was realized,which was characterized with high anti-jamming capability and so on.The detailed model of the full-array-synchronization principle was analyzed and the prototype system was established.Circuits experiment was carried out to verify the feasibility of the entire system.Recovered clock’s time delay in the acquisition node was less than 165 ns when the low-speed synchronous clock signal was transmitted by the unshielded twisted pair of 18 meters length.The experimental results show that the proposed method has good effect when being applied to transfer the standard clock of data acquisition in the linear array.更多还原