Designing a test asset and validating the accuracy of GPS/GNSS speed measurement

Dyukov, A 2017, Designing a test asset and validating the accuracy of GPS/GNSS speed measurement, Masters by Research, Science, RMIT University.

Document type: Thesis
Collection: Theses

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Title Designing a test asset and validating the accuracy of GPS/GNSS speed measurement
Author(s) Dyukov, A
Year 2017
Abstract Global Navigation Satellite System (GNSS) receivers are now widely used for navigation and speed measurements. The increasing demand for vehicles monitoring in regulatory and non-regulatory environments has led to a growing number of GNSS applications in the automobile industry. In addition, GNSS receivers are commonly used by civilian users for navigation and speed measurements.

Manufacturers of GNSS receivers supply speed accuracy parameters in the receiver specification data sheets. However, little information is provided regarding specific conditions when the specified speed accuracy of GNSS receivers might be met. Also, there is limited research available about practical speed accuracy parameters of receivers in a variety of challenging GNSS environments. Finally, to the author’s knowledge, there is no research conducted to understand if adding more satellites from different constellations to GPS, for example, GLONASS provides an improvement in GNSS speed accuracy reporting.

This thesis presents the design of a test asset system capable of testing GNSS receivers for speed accuracy and the Uncertainty of Measurements (UOM) analysis for this system. The test asset system utilises a variety of engineering solutions and is capable of maintaining high accuracy benchmarks in speed measurements. The test asset system has an UOM equal 0.4 km/h for the entire range of speeds used for GNSS speed testing. The system was designed, assembled and tested to ensure the system maintains its integrity and capability to test GNSS receivers for speed measurement. Subsequently, several field experiments were performed to collect GNSS speed data records in a variety of driving environments using different receivers. The receivers ranged from geodetic grade to low cost receivers. Test routes were selected specifically to reflect real world and challenging GNSS environments, such as freeways with overpasses and roads with tree canopies.

Detailed analyses of outliers and statistical results are presented to demonstrate that GNSS receivers may not measure speed correctly under challenging environments. The results also show that different GNSS receivers perform differently in measuring speed. Methods to filter potentially unreliable speed records were also investigated.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Science
Subjects Geomatic Engineering not elsewhere classified
Engineering Instrumentation
Electrical and Electronic Engineering not elsewhere classified
Keyword(s) GPS
Challenging environment
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Created: Thu, 15 Mar 2018, 13:06:29 EST by Adam Rivett
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