Effects of Ocean Fronts on Multipath Vertical Angles and the Associated Biases in Array Bearing Estimation,
Abstract
An oceanic frontal system perpendicular to the propagation path is modeled with a deep receiver in warm water and a shallow source which is moved through the frontal system into progressively colder water. A ray model is used to calculate the arrival structure and determine the effects of the frontal system on ray amplitude and vertical angle. The receiving horizontal line array determines the bias in bearing estimation resulting from the changing multipath structure. This bias is found to be heavily dependent on array orientation and range into the frontal system while being only slightly dependent on array beamwidth. The underlying physics causing the multipath variations is the frontal system acting as a focusing lens. When the transducer positions are reversed, that is a deep receiver in cold water and a shallow source in progressively warmer water, the frontal system acts as a diverging lens.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1979
- Accession Number
- ADA076117
Entities
People
- R. P. Flanagan
- X. Zabalgogeazcoa