Bistatic Active Sonar Equation
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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In a recently published paper, the author derived an ex act form of the echo level for a monostatic active sonar system based on the Helmohltz integral formulation, and showed that this reduces to the common form of the sonar equation if and only if the source and target are in the far-field with respect to each other. In that case it was shown that interaction or multiple scattering terms are unimportant. The purpose of this paper is to perform the same analysis for the more general bistatic geometry in which the receiver is distinct and separated from the source. If all three bodies are at large distances from each other, a simple form again results however, terms arising from multiple scattering can be important if any two bodies are close to each other. Approximate forms are given for these corrections when the receiver is near the source or near the target and when the source is near the target. Reprints.
- Acoustic Detection and Detectors