Localizing Swallow Floats during the July 1989 Experiment
Abstract
Results from localizing Swallow floats using range data collected during the 8-9 July 1989 experiment are presented herein. As part of the Downslope Conversion experiment, the Swallow float deployment was conducted near 34 deg 50 min N, 122 deg 20 min W, about 150 km west, northwest of Pt. Arguello, California. Three Swallow floats were deployed to the ocean bottom and 9 freely drifting floats were ballasted to depths starting at 600 m and spaced every 400 m, to 3800 m. Two localization methods, least squares filter and Kalman filter, were applied to the experiment data so that their results can be compared. Due to the high process noise experienced by the freely drifting floats during the experiment and the quasi vertical line array deployment geometry, the two filters performs comparably. The rms position error is estimated to be less than 3.3 m for the Kalman filter and less than 4.6 m for the least squares filter. Both filters appear to be capable of estimating float positions to within the desired accuracy of one-tenth of a wavelength at the highest frequency of interest 20 Hz (7.5 m) in order to effectively beamform the VLF acoustic data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1990
- Accession Number
- ADA245317
Entities
People
- G. C. Chen
- William Hodgkiss
Organizations
- Scripps Institution of Oceanography