Accession Number:

ADA048954

Title:

ONR/Hughes High Speed Towed Array System (HSTAS)

Descriptive Note:

Final rept. Jan-Sep 1977

Corporate Author:

HUGHES AIRCRAFT CO FULLERTON CA GROUND SYSTEMS GROUP

Personal Author(s):

• Berlin, S.

Report Date:

1978-01-01

Pagination or Media Count:

73.0

Abstract:

During the reporting period FY 1977, a High Speed Towed Array System HSTAS was conceived, designed, and fabricated. The system was successfully sea tested in July of 1977 in Exuma Sound in the Bahamas aboard the RV Harris. In addition to the test being successful from the point of view of equipment operability at sea, the following program goals were achieved a The self noise results revealed that the 6 inch diameter module FAM was always quieter than the 3 inch modules, reaching a peak differential of approximately 15 dB in the frequency range between 80 Hz and 250 Hz at 18 knots towspeed. b The demonstration at sea of the ability to eliminate ownship radiated noise interference from beam outputs by means of an adaptive filter employed as a noise canceller. Specifically, in the case of a broadband interfering signal, a maximum cancellation of 15 dB was achieved, while for the narrowband case the cancellation was 18 dB. For this latter effort, the RV Harris was augmented acoustically by towing the HX-90 noise source.

Descriptors:

• *TOWED ARRAYS
• *TOWED SONAR
• TEST AND EVALUATION
• TURBULENCE
• TURBULENT BOUNDARY LAYER
• RESONANT FREQUENCY
• MATHEMATICAL ANALYSIS
• DATA REDUCTION
• DATA ACQUISITION
• ADAPTIVE SYSTEMS
• ACOUSTIC SIGNALS
• HYDROPHONES
• CONVECTION(HEAT TRANSFER)
• ENGINEERING DRAWINGS
• TOWING CABLES
• SONAR ARRAYS
• SELF NOISE

Subject Categories:

• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE