Verification of airborne positioning using Global Positioning System carrier phase measurements

Mader, Gerald L.; Lucas, James

doi:10.1029/jb094ib08p10175

Cited by 17 publications

(7 citation statements)

References 3 publications

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“…The kinematic position solution is determined as a correction to the a priori position of the moving antenna. The change in position is observable from the change in phase over time [Mader, 1986]. Accurate kinematic positioning using the carrier phase measurement depends on the availability of goodquality GPS satellite ephemerides, tracking consistency and satellite geometry, correction of the observations for propagation media effects, and accurate determination of initial carrier phase biases (ambiguity resolution).…”

Section: Gps Kinematic Position Solutionsmentioning

confidence: 99%

Precise mean sea level measurements using the Global Positioning System

Kelecy¹,

Born²,

Parke³

et al. 1994

J. Geophys. Res.

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This paper describes the results of a sea level measurement test conducted off La Jolla, California, in November of 1991. The purpose of this test was to determine accurate sea level measurements using a Global Positioning System (GPS) equipped buoy. These measurements were intended to be used as the sea level component for calibration of the EI•S i satellite altimeter. Measurements were collected on November 25 and 28 when the EP•S i satellite overflew the calibration area. Two different types of buoys were used. A waverider design was used on November 25 and a spar design on November 28. This provided the opportunity to examine how dynamic effects :øf'•he measurement platform might affect the sea level accuracy. The two buoys were deployed at locations approximately 1.2 km apart and about 15 km west of a reference GPS receiver located on the rooftop of the Institute of Geophysics and Planetary Physics at the Scripps Institute of Oceanography. GPS solutions were computed for 45 minutes on each day and used to produce two sea level time series. An estimate of the mean sea level at both locations was computed by subtracting tide gage data collected at the Scripps Pier from the GPS-determined sea level measurements and then filtering out the high-frequency components due to waves and buoy dynamics. In both cases the GPS estimate differed from l•app's mean altimetric surface by 0.06 m. Thus the gradient in the GPS measurements matched the gradient in l•app's surface. These results suggest that accurate sea level can be determined using GPS on widely differing platforms as long as care is taken to determine the height of the GPS antenna phase center above water level. Application areas include measurement of absolute sea level, of temporal variations in sea level, and of sea level gradients (dominantly the geoid). Specific applications would include ocean altimeter calibration, monitoring of sea level in remote regions, and regional experiments requiring spatial and temporal resolution higher than that available from altimeter data. Paper number 93JC03355. 0148-0227/94/93JC-03355505.00 ceivers can be used to compute the relative position of a moving G PS antenna, as a function of time, relative to a fixed reference G PS antenna to an accuracy of centimeters over baselines of several tens of kilometers [Rocken et yd., 1990]. These position measurements can be expressed in terms of the latitude, longitude, and geodetic height of the antenna phase center. If the moving G PS antenna is mounted to an ocean buoy and the buoy antenna phase center above sea level is accurately calibrated, a sea level time series c&n be measured. If the buoy is horisontally constrained and measurements are made at the appropriate frequency, then mean sea level, sea level change due to tides, and 7951 7952 KELECY ET AL.: GLOBAL POSITIONING SYSTEM SEA LEVEL MEASUREMENTS

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Section: Gps Kinematic Position Solutionsmentioning

confidence: 99%

Precise mean sea level measurements using the Global Positioning System

Kelecy¹,

Born²,

Parke³

et al. 1994

J. Geophys. Res.

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“…Recent progress in data analysis techniques [Mader, 1986] and in receiver technology have made possible the instantaneous determination of the position of a moving vehicle with better than decimeter accuracy and more often than once per second. Applications to the precise post‐mission navigation of aircraft for the altimetric profiling of terrain or sea surface, for photogrammetry, and for airborne gravity surveys, have been discussed and demonstrated [Krabill and Martin, 1987; Mader and Lucas, 1989; Brozena et al, 1989]. In photogrammetry, GPS aircraft/camera positioning has been thought of as an alternative to costly ground control obtained through conventional land surveys [Lucas, 1987].…”

Section: Gps Positioningmentioning

confidence: 99%

Satellite Positioning

Colombo

Watkins

1991

Reviews of Geophysics

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The last four years have brought major changes to the practice of space geodesy, the most remarkable being the proliferation of precise techniques using the Global Positioning System to locate both points fixed to the Earth's surface and on moving vehicles. In their most accurate applications, GPS methods compare increasingly well with satellite laser ranging when measuring baselines of up to 1000 km. Meanwhile, the performance of laser systems has continued to improve, and the steady operation of laser sites around the world has extended the span of recorded observations to nearly one and a half decades of very high quality data.

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“…For several years, measurements of the carrier phase from satellites of the Global Positioning System have been used to determine the positions of moving platforms with precisions of several centimeters [Mader and Lucas, 1989] and have been used to determine the positions of ground momuments with occupation times as short as a few minutes [Remondi, 1985]. These kinematic GPS techniques have clearly demonstrated the utility of GPS for remote sensing applications and rapid geodetic surveying and ensure that GPS will certainly see w•der use as the constellation nears completion.…”

Section: Introductionmentioning

confidence: 99%

Rapid static and kinematic global positioning system solutions using the ambiguity function technique

Mader¹

1992

J. Geophys. Res.

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This paper describes an ambiguity function technique by which phase data from the Global Positioning System (GPS) maybe used to obtain survey positions for monuments occupied using a suitable GPS receiver. The principal benefit of the technique is the speed with which it may be used and its immunity to cycle slips or other discontinuities in the phase data that commonly occur. The technique uses phase measurements from satellites at both L1 and L2 frequencies from various directions in the sky. When sufficient measurements are available, the signals will destructively interfere at all but the correct location. Depending on the satellite geometry, the number of satellites in view, and the a priori knowledge of the station's position, a sufficient number of measurements may be obtained from a single monument occupation. The data collected over an occupation lasting only a few minutes maybe averaged to a single value at a particular epoch. Equivalently, the data collected at only a single epoch may also be used. The ability of the technique to work with data from a single epoch allows the integer ambiguities on moving platforms to also be determined. This will greatly enhance the practical operation of kinematic GPS for a variety of remote sensing applications. A computer program employing this ambiguity function technique has been written and used to process static as well as kinematic data. The results indicate horizontal precisions and accuracies of 1 cm or better and vertical precisions and accuracies of 1 to 3 cm. The data processing requires no data editing, is easy to use, and can be operated without any specialized knowledge of kinematic GPS techniques. The correction for the effects of the ionosphere are also demonstrated at distances up to 250 km. The use of the ambiguity function for geophysical monitoring and kinematic remote sensing applications appears limited in distance only by the accuracy of the GPS orbits. The utility of the ambiguity function for rapid static surveying and on‐the‐fly bias fixing out to distances of several hundred kilometers appears practical.

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Verification of airborne positioning using Global Positioning System carrier phase measurements

Cited by 17 publications

References 3 publications

Precise mean sea level measurements using the Global Positioning System

Precise mean sea level measurements using the Global Positioning System

Satellite Positioning

Rapid static and kinematic global positioning system solutions using the ambiguity function technique

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