Deep-Water Noise Created by the Flight of a Vandal Missile Over a Slightly Wavy Ocean Surface
Abstract
A Vandal sea-skimming missile was launched from the Pacific Missile Range Facility (PMRF) on 19 March 2004. The trajectory was recorded, and sound measurements were made at seven different hydrophones located at large depths beneath the ocean surface. The hydrophones were not calibrated, and thus the recordings contain no quantitative amplitude information. In this report, a calculation is made of the predicted noise amplitude at one of the hydrophones. The calculation utilized the computer code developed by H. K. Cheng and C. J. Lee for predicting underwater noise due to a sonic boom running over a wavy ocean surface. The calculation does not agree with the test data. However, the hydrophone data appears to be corrupted with noise from sources which are unrelated to the Vandal's flight. The hydrophones are also positioned too far off the Vandal's flight track to be of use in testing Cheng and Lee's theory. Further use of PMRF is not recommended without additional instrumentation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 07, 2005
- Accession Number
- ADA456735
Entities
People
- D. M. Moody
- J. C. Wang
Organizations
- The Aerospace Corporation