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| Fixed Standard Instrument for Field Tests of Vehicle Speed Measuring Devices Based on Actual Traffic |
| DU Lei1,SUN Qiao1,LIN Feng2,BAI Jie1,WANG Xiao-lei1,YE Zhen-zhou2 |
1. National Institute of Metrology, Beijing 100029, China
2. Zhejiang Province Institute of Metrology, Hangzhou, Zhejiang 310018, China
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Abstract To meet the requirement of new field testing method of vehicle speed measuring devices, a fixed standard instrument for field tests of vehicle speed measuring devices used in actual traffic is developed. The design idea and scheme of the standard instrument are introduced. The working principle of the standard speed meter used in the standard instrument is analyzed, and the speed measurement uncertainty of the standard speed meter is evaluated. The uncertainty evaluation results show that the relative expanded uncertainty is 0.12% (k=3) in the speed measurement range of 20~250km/h. The feasibility of new field testing method of vehicle speed measuring devices and the actual speed measuring performance of the standard instrument in actual traffic are verified by the large samples field testing data of 2 kinds of vehicle radar speed measuring devices.
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Received: 26 October 2017
Published: 11 February 2018
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2018, Vol. 39 
