Calibration of GPS based high accuracy speed meter for vehicles

Yin Bai; Qiao Sun; Lei Du; Mei Yu; Jie Bai

doi:10.1117/12.2178005

6 March 2015 Calibration of GPS based high accuracy speed meter for vehicles

Yin Bai, Qiao Sun, Lei Du, Mei Yu, Jie Bai

Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 94460O (2015) https://doi.org/10.1117/12.2178005
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China

Abstract

GPS based high accuracy speed meter for vehicles is a special type of GPS speed meter which uses Doppler Demodulation of GPS signals to calculate the speed of a moving target. It is increasingly used as reference equipment in the field of traffic speed measurement, but acknowledged standard calibration methods are still lacking. To solve this problem, this paper presents the set-ups of simulated calibration, field test signal replay calibration, and in-field test comparison with an optical sensor based non-contact speed meter. All the experiments were carried out on particular speed values in the range of (40-180) km/h with the same GPS speed meter. The speed measurement errors of simulated calibration fall in the range of ±0.1 km/h or ±0.1%, with uncertainties smaller than 0.02% (k=2). The errors of replay calibration fall in the range of ±0.1% with uncertainties smaller than 0.10% (k=2). The calibration results justify the effectiveness of the two methods. The relative deviations of the GPS speed meter from the optical sensor based noncontact speed meter fall in the range of ±0.3%, which validates the use of GPS speed meter as reference instruments. The results of this research can provide technical basis for the establishment of internationally standard calibration methods of GPS speed meters, and thus ensures the legal status of GPS speed meters as reference equipment in the field of traffic speed metrology.

Citation Download Citation

Yin Bai, Qiao Sun, Lei Du, Mei Yu, and Jie Bai "Calibration of GPS based high accuracy speed meter for vehicles", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94460O (6 March 2015); https://doi.org/10.1117/12.2178005

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