Increasing GPS accuracy for low cost receivers

This thesis presents a theoretical and practical study of the accuracy attainable with low cost consumer grade GPS devices. It begins with a general introduction to the global positioning system and then goes on to focus on position estimation, error sources, and mitigation techniques. Using differential GPS and post-processing of data it should be possible to achieve accuracies within tens of centimeters even with consumer grade devices, so the practical part focused on the development of a working dGPS system. The main limiting factors in such a system are receiver clock accuracy and receiver noise. Unfortunately the project became much too large for a single Master’s Thesis, so the main results are a working set of hardware and software tools for logging and processing data, and a list of the future work needed.

Author: Hennerstrom, David

Source: Lulea University of Technology

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