Global positioning system interferometric reflectometry for accurate tide gauge measurement: Insights from South Beach, Oregon, United States

2020 ◽  
Vol 173 ◽  
pp. 356-362
Author(s):  
Kutubuddin Ansari ◽  
Tae-Suk Bae ◽  
Samed Inyurt
Keyword(s):  
United States ◽  
Global Positioning System ◽  
Tide Gauge ◽  
Positioning System ◽  
Global Positioning ◽  
Gauge Measurement

The Operational Status of NAVSTAR/GPS

1977 ◽  
Vol 30 (1) ◽  
pp. 35-47 ◽  
Author(s):  
Edward M. Lassiter ◽  
Bradford Parkinson
Keyword(s):  
United States ◽  
Global Positioning System ◽  
Navigation System ◽  
Three Dimensional ◽  
Weather Conditions ◽  
Satellite System ◽  
Positioning System ◽  
Timing Information ◽  
The Earth ◽  
Global Positioning

The NAVSTAR Global Positioning System (GPS) is a satellite-based navigation system that will provide extremely accurate three-dimensional position fixes and timing information to properly equipped users anywhere on or near the Earth. The system will be available continuously regardless of weather conditions and will find extensive utilization in improved weapons delivery accuracies, range instrumentation, &c. Furthermore it will provide an ultimate saving in the number and cost of navigation and position-fixing systems currently employed or projected. It is a Joint Service programme managed by the U.S.A.F. with deputies from the Navy, Army and Marines and the Defense Mapping Agency. The system concept evolved from U.S.A.F. and Navy studies initiated in the mid-1960s. Current programme plans call for the deployment of six satellites in 1977 to permit demonstration and evaluation tests over the continental United States. The system will then be expanded through the deployment of additional satellites into an operational 24-satellite system.

The Global Positioning System

1980 ◽  
Vol 294 (1410) ◽  
pp. 395-406 ◽  
Keyword(s):  
United States ◽  
Travel Time ◽  
Global Positioning System ◽  
The United States ◽  
Positioning System ◽  
Absolute Position ◽  
Southwestern Part ◽  
Ground Station ◽  
Global Positioning ◽  
Better Than

The Navstar Global Positioning System, proposed for deployment in 1985, will have eight satellites equally spaced in each of three orbit planes at an inclination of 63°. Since the satellites will be in circular, 20000 km (12 h period), orbits and the nodes of the three orbit planes will be equally spaced, at least four satellites will be in view at any location. Range to three of the satellites, computed from the travel time of signal from the satellite to the ground, would give the position of the ground receiver. The measurement to the fourth satellite is required to synchronize the ground station clock with the satellite to provide a sufficiently accurate travel time. In order that the system may be demonstrated in early 1979, six satellites are now being launched into orbits that will provide the operational configuration over the southwestern part of the United States for a few hours each day. The accuracy of the instantaneous absolute position is expected to be 10 m. The relative position of two stationary receivers could be determined to 1 m accuracy in a few minutes even if the receivers are separated by 1000 km. Relative positions could be determined to better than 10 cm accuracy within a day.

scholarly journals Global Positioning System Interferometric Reflectometry for Accurate Tide Gauge Measurement: Insights from South Beach, Oregon, United States

2020 ◽  
Author(s):  
Kutubuddin Ansari ◽  
Tae-Suk Bae ◽  
Samed Inyurt
Keyword(s):  
Global Positioning System ◽  
Sea Water ◽  
Tide Gauge ◽  
Signal To Noise Ratio ◽  
Moving Average ◽  
Singular Spectrum Analysis ◽  
Autoregressive Moving Average ◽  
Positioning System ◽  
Observation Network ◽  
Global Positioning

Global Positioning System (GPS) stations located along coastal areas have the ability to measure tide gauge (TG) records by reflected signal reception from the sea water surface. In this study we used the GPS signal-to-noise ratio (SNR) data from the SEPT station (44.63 ⁰N, 124.05 ⁰W) located at South Beach, Oregon, USA, to estimate the TG records using only a few measurements. First, we derived the TG record from a GPS station (GPS-TG) and used traditional TG data from the National Water Level Observation Network (NWLON) sentinel station (Station ID: 9435380) located in Oregon for validation purposes because it was closest to the SEPT station. Our results show that the GPS-TG and NWLON-TG correlate well with the correlation coefficient (CC) of 0.942 and the root mean square (RMS) of their residuals was about 12.90 cm. The corresponding TG prediction by autoregressive moving average (ARMA-TG) and singular spectrum analysis (SSA-TG) models are evaluated for their effectiveness over the station. The comparative analysis demonstrates that the GPS-TG has improved correlation with ARMA-TG (CC of ~0.981 CC, RMS of ~4.80 cm), and SSA-TG (CC of ~0.998 CC, RMS of ~ 0.88 cm) compared to the NWLON-TG (CC of ~0.942 CC, RMS of ~12.90 cm) values. We believe the outcomes from this study contribute to a better understanding of the numerical modeling of TG records as well as other measurements based on reflectometry techniques.

scholarly journals Reprocessed height time series of GPS stations at tide gauges

2012 ◽  
Vol 4 (2) ◽  
pp. 1025-1067
Author(s):  
S. Rudenko ◽  
N. Schön ◽  
M. Uhlemann ◽  
G. Gendt
Keyword(s):  
Time Series ◽  
Global Positioning System ◽  
Tide Gauge ◽  
Time Span ◽  
Positioning System ◽  
Tide Gauges ◽  
Sea Level Changes ◽  
Global Positioning ◽  
Global Sea Level ◽  
Continuous Gps

Abstract. Precise weekly positions of 403 Global Positioning System (GPS) stations located worldwide are obtained by reprocessing GPS data of these stations at the time span from 4 January 1998 until 29 December 2007. The used processing algorithm and models as well as the solution and results obtained are presented. Vertical velocities of GPS stations having tracking history longer than 2.5 yr are computed and compared with the estimates from the colocated tide gauges and other GPS solutions. Examples of typical behavior of station height changes are given and interpreted. The derived time series and vertical motions of continuous GPS at tide gauges stations can be used for correcting tide gauge estimates of regional and global sea level changes.

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