Passive determination of target data by selective reception of acoustic waves used in e.g. carrier vehicle, involves using electroacoustic transducer arrangement for sonar reception on carrier vehicle to determine position of target

摘要

The method involves using an electroacoustic transducer arrangement for sonar reception on a carrier vehicle to selectively receive acoustic waves transmitted from a target and to determine the estimated position of the target from the estimated pinpointing angles and measured pinpointing angles of the received acoustic waves. The difference between the estimated and measured pinpointing angles is iteratively minimized. The measured and estimated pinpointing angles are used to form a pinpointing triangle which is used to determine the parallax values (P) for determining target data. The parallax value is compared with a parallax limit value to determine the distance (D) and measured pinpointing angle of the transducer arrangements used in determining the target data. The target data include the target course, distance and speed. The differences between the transducer arrangements and measured bearings of the transducer arrangements are predetermined and averaged to determine the target data.