Abstract
The directional response characteristics of the parametric acoustic receiving array (PARRAY) have been shown analytically to be essentially those of a continuous, end‐fired array with a length equal to the pump‐hydrophone separation [H. O. Berktay and J. A. Shooter, J. Acoust. Soc. Am. 54, 1056–1061 (1973)]. The analytical model predicts that the levels of successive side lobes decrease monotonically to some minimum in the back direction. A number of earlier studies have established the validity of the analytical expression for the directional response function over the main lobe and first few side lobes; however, measurements of the far‐side lobe levels and front‐to‐back ratio have not been reported. Using an experimental PARRAY with a pump‐hydrophone separation of 60 m, measurements of the front‐to‐back ratio have been obtained for signal frequencies from 250 to 1000 Hz. These measured data are presented and compared to predictions based on the analytical model. [This work was supported by the Defense Advanced Research Projects Agency and the Naval Electronic Systems Command, Code 320.]
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