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10 September 1987 Multimode Imaging For Underwater Robots
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Proceedings Volume 0768, Pattern Recognition and Acoustical Imaging; (1987)
Event: International Symposium on Pattern Recognition and Acoustical Imaging, 1987, Newport Beach, CA, United States
In this paper we introduce a new application for ultrasonic imaging that has not received much publicity: ultrasonic imag-ing for underwater robots. After a brief survey of some of the applications we consider the conceptual design of an underwater ultrasonic imaging system. The goal of the system is to provide 3-dimensional images about objects that are distances of 10's of meters away at real time video rates. In order to achieve this goal, we suggest that a principle of spatially variant insonification (SVI) be employed. This technique propagates multiple sonar beams into the medium simultaneously and upon reception, the individual beams are separated. In order to accomplish this, each sonar beam uses a specific code. The mathematical properties of the specific code that are em-ployed insure that this is possible. The design of these codes is identical to that encountered in multi-access, spread spec-trum, communication systems. Therefore, the time-bandwidth properties of the system limit the simultaneous requirement of decorrelatable beams and good range resolution. As a specific implementation of the technique a frequency hopping code is presented. This code is then combined with a sparse receiving array. The resultant system satisfies the above criteria.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jules S. Jaffe and Philippe M. Cassereau "Multimode Imaging For Underwater Robots", Proc. SPIE 0768, Pattern Recognition and Acoustical Imaging, (10 September 1987);

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