Abstract
In the design or operation of sonar systems it is required to know under what conditions optimum performance can be achieved. The subject of this paper is a technique which should be useful in dealing with one term in the sonar equation, namely, transmission loss. Since the amount of energy lost depends on many parameters (e.g., the sound-speed profile, source and receiver depths, frequency, bottom loss, etc.), the process of determining the optimum mix of these parameters is cumbersome even if a validated transmission loss model is available. The approach utilizes the Fast Field Program (FFP) to generate transmission loss values for typical sound-speed profiles of the major ocean areas. It is assumed that at a sufficiently large range the mean propagation loss is represented by A+10 logr+αr where r is horizontal range and α is Thorp's attenuation coefficient. The constant A is then determined from a linear least-squares fit between this expression and the FFP values. The FFP is rerun for various combinations of the input parameters and the value of A are then combined to form a collection of nomograms which display the dependence of the mean transmission loss upon the input parameters. This work supported by the Chief of Naval Material.]
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