GPS tides: A project to determine todal datums with the Global Positioning System
| dc.contributor.author | DeLoach, Stephen, R. | |
| dc.date.accessioned | 2023-03-01T18:27:19Z | |
| dc.date.available | 2023-03-01T18:27:19Z | |
| dc.description.abstract | The recent development of on-the-fly ambiguity resoltuion techniques with Global Positioning System (GPS) observations has created a powerful tool for the study of dynamic time series, such as tidal analysis or the study of water level heights. For this project a GPS receiver was successfully operated on board a Canadian Coast Guard navigation buoy. Ten days of data, at a one-second sample interval, were collected at a station in the open waters of the Bay of Fundy, followed by ten days from an inshore mooring. The buoy data were transmitted in real time to a reference station on shore where antenna heights were computed in real time. Subsequent processing reduced the 1-Hz antenna height series to a 15-minute water surface height series for comparison to two nearby "conventional" gauges. These were the Saint John Harbour permanent gauge and a temporary Socomar pressure gauge. Mean tide heights computed from the inshore data are all within 1 centimetre. The means, computed from the inshore series, differed by 10 centimeters between the buoy and the "conventional gauges," indicating a differential slope between the water surface and the ellipsoid. In addition to the water surface measurements, about 10 days of GPS data were collected from a static baseline to characterize the performance of the on-the-fly GPS system, without the influence of a moving platform. From the 20 days of data, 97 percent is within 3 cm of truth, while the mean daily heights are about 0.3 cm below the truth. This project has demonstrated that the "GPS buoy" is a viable method od tidal datum determination and it should be possible to use the ellipsoid as the basis for water surface datums. | |
| dc.description.copyright | As with any copyrighted material, permission to reprint or quote extensively from this report must be received from the author. | |
| dc.identifier.uri | https://unbscholar.lib.unb.ca/handle/1882/14728 | |
| dc.rights | http://purl.org/coar/access_right/c_abf2 | |
| dc.subject.discipline | Geodesy and Geomatics Engineering | |
| dc.title | GPS tides: A project to determine todal datums with the Global Positioning System | |
| dc.type | technical report |
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