Detection of transient motions with the Global Positioning System
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Detection of transient motions with the Global Positioning System
May 10, 1996 - GPS sites, perhaps once or several times per year [e.g., Davis et al., 1989 .... motion defined by the user: speed, time duration, and direc- tion. A simple ..... that for a time interval of 300 s, by an amount equal to the square root of the .... mean and a slope from the time series presented in Figure 3, taking over-.
JOURNAL
OF GEOPHYSICAL
RESEARCH,
VOL. 101, NO. Bb, PAGES 11,249-11,261, MAY 10, 1996
Detection of transient motions with the Global Positioning System P. E16seguiand J. L. Davis Harvard-SmithsonianCenter for Astrophysics,Cambridge,Massachusetts
J. M. Johansson Onsala SpaceObservatory,ChalmersUnivcrsityof Technology,Onsala, Sweden
I. I. Shapiro Harvard-Smithsonian Center for Astrophysics, Cambridge,Massachusetts
Abstract. To assessthe capabilityof Global PositioningSystem(GPS) phase measurementsfor the determinationof transientvelocity,we have made measurements with a GPS antennaon a movingplatform. The antennawas translatedin the horizontal
planeat a constant velocityof t mmh-• for a periodof somewhat morethan24 hours while GPS data were recorded simultaneously.Other stationaryantennasat distancesof t0 m to -1000 km were also simultaneouslyrecordingGPS data. We calculatedan averagevelocityof the movingantennaby modelingits time-dependentpositionas a randomwalk and fitting a straightline to the stochasticestimates.We have found that the accuracyof the resultingvelocityestimatesis dependenton the observingperiod and the baselinelength.For 24-hourdata time spans,rmshorizontalvelocityerrorswere lessthan 0.2
mmh-• forallbaseline lengths; forsimilar timespans, rmsvertical velocity errors were0.30.9 mm for lengthsbetween tOOand 1000 km, and •> 1, then we will have a weakly constrained itly assuminga rectilineartrajectoryfor its motion and ignoring solution and will allow for estimated variations in ax and v the correlationsbetweenthe estimatesof position.(If the ve- whichare muchgreaterthan the true variations.If sc
