Research On The Calibration Problem Of Linear Sonar Array

This paper is to research the calibration problem of linear sonar array.Linear array, as a form of sonar array, plays an important role in DOA(Direction ofArrival). The system error of DOA is produced by the array error, including the sensorgroup delay error and the sensor position error. As a result the performance of DOA islimited greatly. Therefore, it is necessary to calibrate the sensor group delay error andthe sensor position error. In order to improve the performance of DOA. the calibrationproblem of linear sonar array need to be solved urgently.Improving the performance of DOA by calibrating the sensor group delay error andthe sensor position error. This paper has3key technical problems need to debate.(1)How the performance of DOA is decreased by the sensor group delay error andthe sensor position error. About this problem, however, we still stays in stage ofperceptual cognition. The lacking of quantitative analysis in math restricts to researchDoA furtherly. Thereby, the first key technical problem of array calibration is that howto analyze the the performance of DOA which is decided by the sensor group delayerror and the sensor position error.(2)How to calibrate the linear sonar array? During the research, the feasiblemethods of array calibration should be analyzed firstly, and then choosing the best onAccordingly, the second key technical problem of array calibration is that how tocalibrate the linear sonar array.(3)How to carray out the calibration of linear sonar array? In order to take the arraycalibration into practice, the third key technical problem is how to carray out the arraycalibration with material system.In order to solve the first key technical problem, this paper first analyzed thesystem error of DOA, and then put forward a rule of calibration. In order to solve thesecond key technical problem, this paper established a model of array calibtration, andstudied the method of phase difference mesurement in high accuracy. In order to solvethe third key technical problem, this paper designd2systems for array calibration.Finally, basing on the parameters of xxx sonar system, this paper carries out ansimulation of array calibration. The sensor group delay error and the sensor positionerror in high accuracy were got. As a result, the performance of DOA was improvedevidently, the goal of this paper was riched.