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Assessments on the effects of mixing different types of GPS antennas and recievers.
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Satellite Positioning.
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The accuracy and reliability of the GPS system mainly depend on the GPS receivercomponents i.e. the GPS antenna and receiver. GPS receiver components are influencedby their types and methods of calibration. Antenna calibration determines individual GPSantenna phase variations, considering specified orientation. Different approaches ofantenna calibrations provide different GPS accuracies. Therefore, in order to obtain therequired accuracy from specific campaign of GPS measurements, selection of suitableantenna types and use of the same antenna and calibration method are recommended. TheGPS antenna part of this thesis is focused on the effects of changing antenna orientationfrom originally calibrated direction (north), and then on the effects of mixing differenttypes of GPS antennas. Trimble Compact L1/L2, Zephyr Geodetic, Leica AT502, andAshtech 701945 E_M Rev E antennas and Trimble R7, Trimble 4000SSE, and Leicareceivers are used for this investigation.Orientation effects of antennas are studied by using two Trimble receivers and Ashtechantenna. Significant variations are observed on the horizontal vector components than onthe height vector components and maximum variations are observed when rover stationantenna pointing south. Form the investigation made on the effects of mixing differenttypes of antennas great variations are observed on the height vector components than onthe horizontal vector components, which range from ±2 to 4cm and variation reachedmaximum at Leica-to-Ashtech antenna combinations. They increase by ±1-2mm and ±2-3cm on the horizontal and on the vertical vector components, (respectively) whenantenna correction factors are removed from the rover station. From the investigationmade on the effects of mixing different types of GPS receivers the variations on thevertical vector components mostly lie between ±6-8mm,whereas the variation on thehorizontal vector components lie between ±2mm. The result shows an agreement withpreviously done experiment by Freymueller (1992). Moreover, maximum variations areobserved to Trimble R7-to-Trimble 4000SSE and/or Trimble R7-to-Leica receiver withLeica-to-Ashtech antenna combinations. However, effects of mixing different types ofGPS receivers are smaller when comparing with the effects of mixing different types ofGPS receivers. Therefore, this agreed with Völksen (2002).Finally, this investigation has given an insight for the need of giving particular attentionwhen mixing different types of GPS antennas and/or receivers to the same campaign,specifically, which needs greater height accuracy. The thesis also recommends that theneed and importance of further research using greater numbers and types of GPSinstruments using the same and/or different approach to arrive at quantifiable values ofthe effects on each vector components and to investigate the sources of strange results.

Place, publisher, year, edition, pages
2008.
Series
TRITA-GIT EX ; 08-09
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-199693OAI: oai:DiVA.org:kth-199693DiVA, id: diva2:1065072
Supervisors
Available from: 2017-01-19 Created: 2017-01-13 Last updated: 2017-01-19Bibliographically approved

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