浅海三元阵近程被动定位实验研究

Experimental research on passive near field ranging of a three-sensor array in shallow water

为改进三元阵被动测距性能,采用了滑动窗互相关器估计代替常规的互相关器测时延,与常规互相关器相比时延计性能明显提高,当常规的互相器无法测得相关峰时,滑动窗互相关器仍然能较准确地测得时延;采用的适用于近程的方位和距离的改进计算公式,在近程有很高的精度.利用浅海、近程的三元阵被动测距海试数据,对所采用的改进方法进行了验证,目标船为摩托艇,将测距结果与精度为20 cm的差分GPS定位结果比较,表明二者吻合较好,相对误差在米量级.

To improve passive ranging of three-sensor arrays, a sliding correlator was adopted to improve the per- formance of time delay estimation. Compared with the traditional correlator, the sliding correlator＇s abilities are sub- stantially increased. The sliding correlator gets time delay clearly, while the traditional correlator cannot even dis- tinguish the correlating peak. An improved formula with high precision for near targets was adopted. The experi- mental results of a three-sensor array＇s near field passive ranging in shallow ocean water were obtained and compared with differential global positioning system （DGPS） data with 20cm accuracy, where the target was a motorboat. The comparison shows the proposed processor makes obvious improvements in ranging performance, with variance under several meters.