C/a Code Multipath Mitigation at GPS Base Stations for Improved DGPS Corrections Using Wavelets

Dammalage, Thilantha Lakmal; Satirapod, Chalermchon; Kibe, S. V.; Ogaja, Clement

doi:10.1179/003962610x12572516251925

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…Author of this article is extremely grateful to the co-authors of the initial study Dammalage et al (2010), notably, Prof. Chalermchon Satirapod of the Department of Survey Engineering, Faculty of Engineering, Chulalongkorn University, Thailand.…”

Section: Acknowledgementsmentioning

confidence: 99%

“…The combination of non-common mode errors both at the reference and the point of observations, and the remaining common mode errors characteristically form a noise-like variation in the time domain [5]. For some GPS applications, however, the estimation of precise carrier phase DGPS correction is crucial; for instance, in deformation or landslide monitoring and large structure dynamic monitoring, where most analyses and predictions are based on the noisy-like variation of the position of observation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Site-Dependent Errors on the Accuracy of C/A Code DGPS Positioning

Dammalage

2018

CivileJournal

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Several differential GPS processing techniques can be used; for instance, single differencing and double differencing, which are popular in practice. Irrespective of the DGPS processing technique used, the ultimate accuracy of the user-location depends on the existence of non-common or site-dependent errors, which occur at the points of observation and the reference. Of these, the most common and dominant site-dependent error is the multipath. Therefore, this research evaluates the effects of site-dependent errors on C/A code differential GPS correction accuracies by providing special emphasis on the multipath error. For the analyses, four segments of about 24-hour continuous static C/A code based DGPS observations were conducted at three precisely known ground stations and four different multipath environments were introduced by placing three different types of artificial signal reflectors at one of the observation stations. By using the known GPS receiver-reflector configuration, pseudo-range multipath was precisely calculated for each observation segment. C/A code DGPS positioning accuracies before and after multipath mitigation were presented by evaluating the effect of the most dominant site-dependent error, i.e., multipath, on C/A code DGPS correction accuracies.

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Section: Acknowledgementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Site-Dependent Errors on the Accuracy of C/A Code DGPS Positioning

Dammalage

2018

CivileJournal

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“…Most of the presently available GPS receivers utilize almost all the state-of-the-art technical improvements in GPS hardware and processing algorithms. However, still these GPS receivers suffer from significant positioning errors due to signal propagation delays through ionosphere and troposphere, satellite and receiver clock errors, bias on ephemeris data, multipath, and receiver and measurement noises [6][7][8]. Hence, the standard positioning service (SPS) accuracy widely varies with time, place, and most importantly, GPS receiver performance [2].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Multipath on Single Frequency C/A Code Based GPS Positioning

Dammalage

2018

Eng. Technol. Appl. Sci. Res.

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The differential GPS (DGPS) technique is one of the most popular and comparatively accurate techniques available to enhance the positioning accuracy by minimizing most of the common errors. However, the ultimate accuracy of the user location depends on the remaining non-common errors (multipath, receiver clock, and noise), which occur at the points of observation and reference. Out of these errors, multipath is the most dominant and challenging error to predict and minimize. Single frequency C/A code based GPS receivers are popular due to their comparatively low cost compared to dual frequency (L1/L2) GPS receivers. This paper focuses on evaluating the effect of multipath error on single frequency C/A code based GPS positioning. For the analysis, 72,000 continuous GPS observations with one-second interval under four different multipath environments were conducted by utilizing three geodetic GPS units. Accordingly, the observations with more than 5cm on the 2D positional error, created by the effected multipath, were always less than 25%. Here, an average of 16% of observations exceeded 20cm in 2D positional error. Further, it was noted that the presence of multipath introduces significantly higher and comparatively lower 3D positional errors on DGPS observations. This could be due to the compensation of negative and positive effects caused by the multipath and other remaining non-common mode errors at the reference and user stations. In addition, C/A code based single frequency GPS observations were significantly influenced by multipath, not only by the close-by reflectors but also by the ground surface. The effect of multipath was about 50% of the total 3D positional error for the four tested multipath environments.

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A new method to mitigate multipath error in single-frequency GPS receiver with wavelet transform

Azarbad

Mosavi

2013

GPS Solut

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C/a Code Multipath Mitigation at GPS Base Stations for Improved DGPS Corrections Using Wavelets

Cited by 10 publications

References 12 publications

Effects of Site-Dependent Errors on the Accuracy of C/A Code DGPS Positioning

Effects of Site-Dependent Errors on the Accuracy of C/A Code DGPS Positioning

The Effect of Multipath on Single Frequency C/A Code Based GPS Positioning

A new method to mitigate multipath error in single-frequency GPS receiver with wavelet transform

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