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Modulated pulse laser with pseudorandom coding capabilities for underwater ranging, detection, and imaging.

Brandon Cochenour¹, Linda Mullen, John Muth

¹Naval Air Systems Command, Patuxent River, Maryland 20670, USA. brandon.cochenour@navy.mil

|November 24, 2011

Summary

This study explores modulated-pulse (MP) waveforms for improved underwater optical detection. Experimentally evaluating single-tone and pseudorandom coded MP sequences shows promise for clearer imaging in turbid waters.

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Area of Science:

Optical Engineering
Ocean Optics
Signal Processing

Background:

Underwater optical detection is hindered by light absorption and scattering.
Existing methods like range-gating and intensity modulation offer partial solutions.
A modulated-pulse (MP) waveform is proposed to enhance target contrast further.

Purpose of the Study:

To investigate the effectiveness of modulated-pulse (MP) waveforms for underwater optical sensing.
To experimentally evaluate different MP waveform types in turbid water conditions.
To assess the impact of the underwater environment on MP signal propagation.

Main Methods:

Development of a rugged laser source capable of synthesizing modulated-pulse waveforms.
Experimental evaluation of single-tone MP waveforms.

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Experimental evaluation of pseudorandom coded MP sequences.

Analysis of signal propagation and target contrast in simulated turbid water.

Main Results:

Demonstrated the feasibility of using a modulated-pulse waveform for underwater optical detection.
Compared the performance of single-tone MP and pseudorandom coded MP sequences.
Quantified the improvements in target contrast achievable with MP waveforms.

Conclusions:

Modulated-pulse waveforms offer a promising approach to enhance optical detection and imaging in turbid waters.
Different MP waveform designs yield varying degrees of performance improvement.
Further research into MP waveform optimization is warranted for practical underwater applications.