Compare at sea position using Mini-Ranger, Loran C (Internav) in the context of measuring current velocity with a shipboard ADCP (Acoustic Dopller Current Profiler)
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Authors
Moschovos, Ioannis S.
Subjects
Loran C
Mini-Ranger
ADCP
Mini-Ranger
ADCP
Advisors
Collins, Curtis
Date of Issue
1989-12
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
The scope of this thesis is to evaluate the use of the MINI RANGER, LORAN (TD) and LORAN (DISPLAY) navigation systems in order to support the collection of current profiles by an Acoustic Doppler Current Profiler Recorder (ADCP).
A theoretical error analysis of these systems is undertaken in order to establish the minimum error limits which might be expected when averaging current profiles over time frames of up to 30 minutes.
Experimental data was collected with all of these systems in the Monterey Bay and was analysed, the results being presented in this thesis. In addition GPS data was also collected but time has prohibited its analysis and subsequent inclusion.
The results show that because of ship fluctuations in course and speed there is no statistically significant difference between the navigation systems when we average the data over times of about 25- 30 minutes. However, they also show that both the MINI RANGER and Bottom Tracking with the ADCP can produce reasonable results in as little as three minutes, although the ADCP results are clearly biased.
Type
Thesis
Description
Series/Report No
Department
Organization
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NPS Report Number
Sponsors
Funder
Format
98 p.