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. The purpose of this report is to compute a predicted noise amplitude at one of the hydrophone locations, and to compare the prediction with actual data from that hydrophone. 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 that are unrelated to the Vandal's flight. The hydrophones also are 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
- ADA439889
Entities
People
- D. M. Moody
- J. C. Wang
Organizations
- The Aerospace Corporation