摘要
基于同步式水声定位系统的定位解算原理,分析了单阵元时延估计误差对系统定位精度的影响。结合水声信道特点,揭示了目标位于不同位置时直达声和海面一次反射声相位差的变化规律;探讨了界面反射对系统定位精度影响的物理机理;并利用"相消干涉"信号前后"边沿"的时延差等于发射信号长度这一信号叠加特征改进常规信号检测器的信号处理逻辑,以提高信号检测能力和时延估计精度,减小多途影响,改善水声定位系统性能。仿真结果验证了该方法的有效性。
Based on the positioning solving principle of synchronous underwater acoustic positioning system,the effect of error in time-delay estimation from a single sensor on positioning precision was analyzed.Based on the characters of underwater acoustic channel,the change law in the phase difference between direct sound and surface reflected sound was revealed when the target is in different location;the physical mechanism of interfacial reflection influence on positioning precision was inquired into;the signal processing logic of conventional signal detector was improved using the character of signal superimposition,which is expressed as the time-delay difference between times of trailing and forward edges in offset interference signal is equal to the length of the sending signal,to improve signal detection ability and time-delay estimation precision,reduce multi-path influence on chronometric precision and modify the systematic performance.The simulated results show that the method is effective
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第1期24-29,共6页
Acta Armamentarii
基金
哈尔滨工程大学基础研究基金项目(HEUFT08023HEUFT08026)
关键词
信息处理技术
水声定位系统
界面反射
信号检测
时延估计
定位精度
information processing
underwater acoustic positioning system
interface reflection
signal detection
time-delay estimation
positioning precision
