摘要
水声脉冲测距系统中,测时精度决定了系统整体的测距精度。提出了一种基于三次样条插值的测时方法。该方法通过三次样条插值重新构建信号,精确求出每个载波周期的峰值,从而提取出信号包络。在对信号包络进行平滑后通过求解斜率最大值来估计时延。实验结果与理论分析是一致的,表明该方法对水声脉冲信号测时可以达到很高的精度。
The time measurement is the key technology in underwater acoustic ranging, which would directly influence the accuracy. A new method of time measurement is presented： Signal is re-built by cubic spline interpolation and the peak value of each carrier wave cycle is calculated out accurately, therefore signal envelope is collected effectively. Signal envelope is smoothed and positions of maximum gradient points are figured out. The performance is examined, which shows that the algorithm could achieve a high estimation precision.
出处
《声学技术》
CSCD
2010年第1期28-31,共4页
Technical Acoustics
基金
国家高技术研究发展计划资助课题(2006AA09Z310)
关键词
三次样条插值
测时精度
水声脉冲测距
包络提取
cubic spline interpolation
time measuring
underwater acoustic ranging
signal enveloping
