Representing Sonar Signals as Real and Complex Functions,
NAVAL UNDERSEA WARFARE CENTER SAN DIEGO CALIF
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In many circumstances an investigator wishes to use digital computers for simulating sonar receivers. Quite often the proposed implementation of beam-formers or matched-filter receivers will differ from analytically-derived filter characteristics. In order to evaluate different implementations of receivers with respect to each other and the theoretically ideal version, an investigator must use a valid representation of a sonar transmit signal in the computer simulation. Several references have described some of the differences between narrowband signal representation and wideband signal representation. However, much of the signal processing literature is directed to the radar problem which is usually a narrowband signal case. Therefore, this paper will collect the comments of several authors to demonstrate the differences of narrowband and wideband assumptions and their effects on the concepts of complex signal notation, complex modulation, and signal envelope.
- Numerical Mathematics
- Acoustic Detection and Detectors