Theory Of Synchronous Distance Measurement And Its Realization In Underwater Moving Target

In this thesis, we studied the theory about the waveform design of acoustic signal and acoustic positioning. Especially, the theory and realization of cooperative signal and synchronous distance measurement in the measuring system were treated.Firstly, the background as well as the significance of this research work was introduced. At the same time, the status of this research at home and abroad was presented respectively. Secondly, the theory of ambiguity function was detailed. In this section, discussed some parameter, which included the distinguishing, the precision of estimation, and the capability of detection. Also discussed how to select the signal waveform in order to matching the underwater channel and studied how to select the parameter of signal waveform.The measuring system is an ultrashort baseline acoustic positioning system. The principle, application area, positioning error source and associated correction of acoustic positioning system were studied. Also analyzed several methods about distance measurement and emphasized the distance measurement using synchronous clock. Based on the work mentioned above, the engineering realization of hardware and software were completed, Those included: the signal generator, the circuit of D/A transform, CPLD circuit, the circuit of amplifier and matching, wave detector, microcomputer chip, width detector.At last, the system has undergone the test in reservoir. The results of reservoir test stated that the system tracking antisubmarine bomb has good characteristics as: the feasibility of principle, the high precision of distance measurement etc. The performance of this system has matched the engineering requirements.