Method for Enhancing Signal-to-Noise Ratio and Resolution of Amplitude Stable Signals.
Patent, Filed 27 Aug 97, Patented 23 Mar 99
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
A method for enhancing signal-to-noise ratio and resolution of amplitude stable signals wherein underwater acoustic data is first collected with an array of hydrophones, and then the data is digitally sampled. After producing spectra of sequential time snapshots of the digitally-sampled data, the spectra are beamformed for a single frequency. Next the low resolution beamformer response is deconvolved from the data by use of a calculated beam response pattern for the hydrophone array, so that many high-resolution estimates arc created for each time snapshot. Finally, the resulting high resolution estimates are reduced to a single estimate for each spatial bin across all of the time snapsbols, and the high resolution, high gain results are displayed.
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation