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An Efficient Data Acquisition Methodology For Bandpass Sonar Signals

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The function of a data acquisition system is to digitise data from a number of separate channels, and store these samples for later analysis. Sonar systems are typically multi-channel, and the associated data acquisition systems are required to handle data at high data rates. The high data rates involved in digitising bandpass sonar data usually mean that the only viable storage methods available are large magnetic tapes, with data recorded on high-speed tape recorders. One of several disadvantages of this type of storage method is that the types have to be replayed through special decoders to obtain the data in a form ready for analysis. This is a time consuming process, delaying the analysis and interpretation of the data. An alternative method of sampling bandpass sensor data which results in a much lower data rate is presented in this report. The resulting lower data rate allows advantage to be taken of the recent improvements in computer storage technology, enabling a data acquisition system to be constructed that is computer-based, and utilises computer storage devices as its primary storage media. The advantage of this storage method is that the data is in computer readable form, ready for immediate analysis. This work was carried out in support of Navy Task NAV 92401 and an application of the theory of the ANSQS 56 sonar is presented in the Appendices. Bandpass signals, AN SQS 56 Sonar, Active sonar, Beam forming.

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  • Computer Hardware
  • Acoustic Detection and Detectors

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