Performance of High Rate Interpolated Data Applied to Gps Kinematic Positioning

Authors: Chang, C.C.¹; Lee, H.Y.²

Source: Survey Review, Volume 43, Number 321, July 2011 , pp. 303-313(11)

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Abstract:

The GPS observables collected at reference stations for the post-processing type of kinematic positioning are likely to be provided by a public data service on a routine basis with a large sampling interval of 30 seconds. This low-rate data might lead to a non-matching observation with the rovers recording the trajectories with a high data rate of 1 Hz or even greater. To ensure the differential solutions achieved, GPS observables are required to be the same data interval for the two baseline stations. A two-step interpolation technique is proposed to work for GPS data densification to strengthen data availability and reduce the cost of taking any supplementary observation. A curve fitting function, with a linear correction, is applied to interpolate both the phase and the range observables into a higher rate data set for GPS kinematic positioning. It is found that a third order polynomial and a linear correction can work properly to increase the applicable data rate from 30 sec to 1 sec for kinematic positioning. An external accuracy of 0.5 cm in plan and 2.4 cm in height is obtained from a short baseline solution. Another medium baseline solution also confirms that the external accuracies of 1.3 cm in plan and 7.6 cm in height can be achieved using a 1 sec interval of interpolated observables as opposed to raw data. A two-hour static data set is also applied to test for the stand-alone kinematic positioning, namely the precise point positioning (PPP). The PPP solution demonstrates that the N-S component of the accuracy is significantly improved from 34 cm to 15 cm, when the interpolated data is used. Based on the kinematic tests, the accuracies of the solutions using the original data and the interpolated data are generally in good agreement.

Keywords: GPS OBSERVABLES. DATA INTERPOLATION. KINEMATIC POSITIONING. ACCURACY ASSESSMENT

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/003962611X13055561708425

Affiliations: 1: Department of Applied Geomatics, Ching-Yun University, Taoyuan, Taiwan 2: Jet-Link Technology Inc., Taipei, Taiwan

Publication date: 2011-07-01

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