289 results about "Attenuation curve" patented technology

The invention relates to a method for obtaining a sonar operating distance index in a practical use environment. The method comprises the steps of calculating acoustic condition parameters such as sea area sound velocity, sea depth and sea bottom, the depth of an objective sound source and the depth of a sonar array by a sound field propagation model, wherein the acoustic condition parameters such as the sea area sound velocity, the sea depth and the sea bottom, the depth of the objective sound source and the depth of the sonar array are described in an original sonar operating distance index condition, obtaining an acoustic propagation attenuation curve TL0 under the original index condition, bringing a sonar operating distance index value R0 into the acoustic propagation attenuation curve TL0, correspondingly obtaining a high-quality factor FOM0 under the index condition, calculating a difference value between a practically measured objective radiation noise lever SL1 and an objective radiation noise level SL0 described in the original index, and a difference value between a practically measured background noise level NL1 and a background noise level NL0 described in the original index, obtaining a sonar high-quality factor FOM1 under a practical use condition, wherein the FOM1 is the sum of FOM0, delta SL and delta NL, bringing the sonar high-quality factor FOM1 into an acoustic propagation attenuation curve TL1 in the practical environment, and correspondingly obtaining a sonar operating distance index value R1 under the practical use condition.