APPLICATION OF SPIKING FILTERS TO ARRIVAL TIME AND AMPLITUDE MEASUREMENT OF UNDERWATER ACOUSTIC SIGNALS

Authors
  1. Heard, G.J.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
The work was motivated by the need to measure arrival times of explosive (SUS) generated acoustic signals with overlapped multipath arrivals. Single path SUS charge energy received by hydrophones typically lasts for 1 to 2 seconds, a time period that is often greater than the time difference between the direct and surface-reflected arrivals at a hydrophone more than a few hundred meters from the explosion. The overlapped waveforms can be diffuclt to separate, especially when noise is present and the signal has been modified by pre-whitening filters in the receiver. Spiking filters were investigated for application to travel time and arrival amplitude measurements of the direct and surface-reflected energy from a SUS charge detonation. The timing and arrival amplitude accuracies have been investigated using simulated data. Spiking filters were applied to WEDGEX field data and examples of timing and amplitude measurements are given. The spiking filter approach to arrival time measurements proved to be a robust and sufficiently accurate solution for the motivating problem. For cases were waveform overlap is limited, spike amplitudes can also be used. The spiking filter approach is recommended for application to such problems.
Keywords
Shaping filters;Bottom measurement
Report Number
DREP-TM-94-112 — Technical Memorandum
Date of publication
23 Jun 1994
Number of Pages
32
DSTKIM No
94-04360
CANDIS No
144155
Format(s):
Hardcopy;Originator's fiche received by DSIS

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