OPTIMAL ANALYSIS OF GPS POSITION TIME SERIES

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AMIRI SIMKOOEI A.R.; Mohammadloo T.H.; ASGARI J.

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Seminar: IRANIAN GEOPHYSICS CONFERENCE
Year:2016 | Issue:17

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Title

OPTIMAL ANALYSIS OF GPS POSITION TIME SERIES

Author(s)

AMIRI SIMKOOEI A.R. | Mohammadloo T.H. | ASGARI J. | Issue Writer Certificate

Keywords

GPS POSITION TIME SERIES

RANDOM WALK NOISE

OFFSET DETECTION

LEAST SQUARES VARIANCE COMPONENT ESTIMATION (LS-VCE)

NOISE ASSESSMENT

Abstract

PLATE TECTONICS STUDIES USING GPS REQUIRE PROPER ANALYSIS OF TIME SERIES, IN WHICH ALL FUNCTIONAL EFFECTS ARE UNDERSTOOD AND ALL STOCHASTIC EFFECTS ARE CAPTURED USING AN APPROPRIATE NOISE ASSESSMENT TECHNIQUE.BOTH ISSUES ARE ADDRESSED IN THIS CONTRIBUTION. AFTER APPLICATION OF A MULTIVARIATE OFFSET DETECTION METHOD, THE RESULTS OF TIME CORRELATED NOISE FOR A LARGE NUMBER OF CGPS STATIONS ARE PRESENTED. IT IS SHOWN THAT THE UNDETECTED OFFSETS CAN MIMIC RANDOM WALK NOISE, IN AGREEMENT WITH THE PREVIOUS WORK. RANDOM WALK NOISE WHICH WAS NOT CORRECTLY DETECTED IN CASE OF AN INEFFECTIVE OFFSET DETECTION METHOD RESULTED IN OBTAINING INCORRECT RATE UNCERTAINTIES. THIS ISSUE, IF NOT IMPLEMENTED CORRECTLY, WILL BIAS BOTH THE RATES AND THEIR UNCERTAINTIES. FURTHERMORE, APPLYING A NOISE ASSESSMENT METHOD INDICATES THAT FLICKER NOISE HAS THE LARGEST CONTRIBUTION TO THE TOTAL NOISE STRUCTURE OF THE SERIES. THE NOISE AMPLITUDES OF THE UP COMPONENT ARE LARGER THAN THOSE OF THE NORTH AND EAST COMPONENTS BY A FACTOR OF 2.5. IN ADDITION, IN ORDER TO OBTAIN CORRECT RATES, THE ANNUAL AND SEMI-ANNUAL SIGNALS ARE TO BE TAKEN INTO CONSIDERATION IN THE FUNCTIONAL MODEL. THIS COULD ALSO HOLD TO A LESSER EXTENT FOR THE GPS DRACONITIC HARMONICS, ESPECIALLY FOR SHORT TIME SERIES.

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APA: Copy

AMIRI SIMKOOEI, A.R., Mohammadloo, T.H., & ASGARI, J.. (2016). OPTIMAL ANALYSIS OF GPS POSITION TIME SERIES. IRANIAN GEOPHYSICS CONFERENCE. SID. https://sid.ir/paper/925309/en

Vancouver: Copy

AMIRI SIMKOOEI A.R., Mohammadloo T.H., ASGARI J.. OPTIMAL ANALYSIS OF GPS POSITION TIME SERIES. 2016. Available from: https://sid.ir/paper/925309/en

IEEE: Copy

A.R. AMIRI SIMKOOEI, T.H. Mohammadloo, and J. ASGARI, “OPTIMAL ANALYSIS OF GPS POSITION TIME SERIES,” presented at the IRANIAN GEOPHYSICS CONFERENCE. 2016, [Online]. Available: https://sid.ir/paper/925309/en

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