摘要
针对卡堵的管道内检测器需要进行定位的问题,提出了基于声达时间差原理的方位角系数估计方法,并对估计误差进行了理论分析.该方法利用平面四元十字阵对目标声信号进行采集,无需提前标定声音在土壤中的传播速度或者增加传感器的数量.将采集到的各路声信号进行时延估计后,通过时延估计值的四则运算即可得到方位角估计结果.实验数据表明,该方法具有较高的估计精度,可以获知卡堵的管道内检测器的方位,方便下一步的准确定位工作,具有较好的应用前景.
An azimuth coefficient estimation method based on time difference of arrival （TDOA） was proposed to locate the pipeline inspection gauge （PIG） which may be locked by unexpected incidents, and estimation errors were analyzed. Signals were collected by means of four-element cross array, without calibrating sound propagation veloc- ity in the soil or installing extra sensors. Therefore, azimuth can be calculated by estimating time-delay signals of different channels, which is easy to be realized in engineering. Results show that this method can locate the azimuth of PIG with high accuracy, which is helpful in the next accurate location. This method has a great application value because of its simple algorithms and facile operations.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2013年第2期186-189,共4页
Journal of Tianjin University(Science and Technology)
基金
国家自然科学基金面上项目(61074181)
天津市应用基础及前沿技术研究计划项目(09JCYBJC02200)
关键词
管道内检测器
传感器阵列
声达时间差
时延估计
方位角系数
pipeline inspection gauge （PIG）
sensor array
time difference of arrival （TDOA）
time-delay estima-tion
azimuth coefficient
