OBERON Class Acoustic Target Strength at 20–40 kHz

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Authors
  1. Vasiliev, B.
  2. Collier, A.J.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
In November 1994, DRDC Atlantic (then DREA) measured the target strength of an OBERON class submarine at 20–40 kHz using both CW and FM pulses. The measurements were made in a shallow water environment (depth 104 m) over the LaHave Bank along Nova Scotia’s east shore. This report presents results from a recent analysis of the trial data. The time-series of the target echo intensity showed that the highlight structure varied significantly with the aspect angle. For bow and stern aspects, the primary highlights were the hull appendages: bow sonar, sail, hydroplanes, and propellers. At other aspects, the entire submarine hull contributed to the return echo. The CW target strength estimates for the OBERON class were 25–30 dB on the bow, 40 dB on the beam, and 25–30 dB from the stern. The FM estimates were 0–10 dB less. These values were consistent with the submarine target strength measurements found in unclassified literature. In the absence of the propagation loss measurements, the received echo levels were converted to target strength using modeled propagation loss. The environmental parameters for the propagation loss modeling were established by examining the CW and FM reverberation measurements for consistency and comparing the measurements to CW reverberation predictions.

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Report Number
DRDC-ATLANTIC-TR-2008-008 — Technical Report
Date of publication
01 May 2008
Number of Pages
96
DSTKIM No
CA034862
CANDIS No
534367
Format(s):
Electronic Document(PDF)

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