水下侦察网络中的联合沉默定位与时钟同步

Joint silent positioning and synchronization in underwater surveillance networks

针对目前的时钟同步方法无法用于水下侦察网络中的沉默节点,借鉴GPS的伪距定位和授时原理,提出了一种适用于水下环境的联合沉默定位与时钟同步方法,研究了基于MAC层时间戳和时分复用的水下时延测量方法与优化系统性能的锚节点水面布设方式。理论分析和仿真验证表明,联合沉默定位与时针同步方法可以获得和伪距测量误差相当的定位与时钟同步精度,且能够容忍水下信道声线弯曲、声速起伏等因素引起的测距误差。

Clock synchronization of silent nodes in underwater surveillance networks is still incomplete. Inspired by the global positioning system （GPS）, a joint silent positioning and synchronization scheme was proposed, which is suitable for the underwater environment. Research was made on a MAC（Aedia Access Controt） layer timestamp and time division multiplexing based delay measurement method and the anchor nodes deployment for better performance. Theoretical analysis and simulation result indicate that JSPS （Joint silent positioning and synchronization） can achieve synchronization accuracy as high as that of the pseudo range measurement error. JSPS could tolerate the error caused by underwater ray bending and fluctuation of acoustic velocity.