Impulse Response of the Ocean Floor Nonlinear Techniques for Measurement Enhancement
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA SENSORS AND AVIONICS TECHNOLOGY DIRECTORATE
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This report describes a procedure for enhancement of impulse response measurements of the ocean floor. When these measurements are made with explosive charges, the source waveshape, being long and oscillatory, obscures much of the detail in the received signal. The effects of this source waveform can be eliminated by various forms of deconvolution, one of which - homorphic deconvolution - is very flexible in its application and does not require foreknowledge of the source waveshape. Homomorphic deconvolution is a nonlinear process based on filtering the logarithmic spectrum of a signal. The special problems such as phase reconstruction and signal conditioning are discussed in the context of ocean floor measurements with explosives, and a computer code is presented that generates and checks the log-spectrum.
- Physical and Dynamic Oceanography
- Acoustic Detection and Detectors