In the salvage process, data about the shape of shipwreck, sink sitting posture, buried degree and other related information should be required in order to develop salvage program. Three-dimensional imaging sonar is used to provide such data for salvage work by underwater acoustic detection and three-dimensional imaging technology. An application example is described and the results show the effectiveness.

Minimum variance distortionless response (MVDR) beamformer is a better target detection method, which provided high-resolution and anti-interference abilities. But the nice features will be degraded significantly for a fast bearing-rate target. Because the eigenvalue of longtime integral correlation matrix will spread, the signal and interference are no longer clearly identified by the eigenvectors. A beam domain MVDR and motion compensation arithmetic is given in this paper. The motion effect can be compensated by tracking the signal bearing change using real time estimated beam domain covariance matrix. The detection ability of moving target can be improved.

The quality of oil determines the status and life of the devices. However, most Chinese vessels have not equipped with on-line oil quality testing facilities. Therefore, a special on-line oil quality monitoring system for vessels is designed to real-time monitor of oil pollution change. An alarm signal or control signal based on the monitoring results is sent, which supports the purifier automatically and water, particles and gases are removed from the oil to maintain a good oil quality. The system is developed and implemented in the vessel corporation and has a good prospect of application. The application of this system will promote the process of the intelligent device management.