Pattern evaluation programs for traffic speed measurement devices in PR China

Transcription

1 Pattern evaluation programs for traffic speed measurement devices in PR China Q. SUN, NIM China OIML TC7/SC4/p3 Workshop 16 to 18 July 2013, Gaithersburg

2 Content Legal basis for traffic speed measuring instruments Technical basis for pattern evaluation and verification Harmonization with international requirements Future challenges 2

3 Legal basis Why do we need traffic speed measuring instruments? In China, over-speed is the No.1 killer of drivers and passengers in recent years. Safety and protection of man and environment What is the goal by control of speed meters? The measurements in traffic speed are made correctly and according to relevant legal regulations in China all the time. 3

4 Legal basis Why is it a heated but controversial issue in China? The total length of China s highway is about 85,000 km now and increasing number of speed measuring devices of various working principles have been installed along the roads for over-speed detection. Some drivers fined have doubts in the reliability and accuracy of the measurement results, which sometimes lead to lawsuits against the police. 4

5 Legal basis China s Constitution People s Congress Law on Metrology (Article 9), 1986 Parliament Rules for the Implementation of Metrology Law Organizing Ordinances Tasks and Competences (Article 11), 1987 Sector Ordinances Measuring instruments Compulsory Verification Catalogue of Working Instruments 1987 Ministry 5

6 Legal basis Sector Ordinances Measuring instruments Compulsory Verification Catalogue of Working Instruments 1987 Ministry Program of Pattern Evaluation of Fixed-angle Radar Speed Measurement Devices (JJF ) Verification Regulation of Vehicle Laser Speed Measurement Device (JJG ) Verification Regulation of Automatic Monitor System for Vehicles Speed(JJG )* Verification Regulation of Vehicles Radar Measuring Speed Meters (JJG )** and so on. * Revised version of 1988 ** Revised version of

7 Legal basis Pattern evaluation, type approval and initial verification for the traffic speed measuring instruments to be applied for official use. Type approval (Pattern evaluation) Verification (Initial +subsequent) 7

8 Legal basis Pattern evaluation Systematic examination of the performance of a type of measuring instrument in order to determine whether the type may be approved for official measurements. Decision of legal relevance, that the type complies with the relevant statutory requirements. >> Type approval (certificate) 8

9 Legal basis Initial and subsequent verifications Procedure (reduced than type approval) which includes the examination to confirm that each individual measuring instrument complies with the statutory requirements (error limits). When the instrument fulfills this requirements then >> verification certificate 9

10 Legal basis Subsequent verification of measuring instruments Measuring instruments used for official measurements are subject to periodic verification. Subsequent verification guarantees continual conformance of the speed measuring devices with the according requirements. Authorized verification laboratories are responsible. 10

11 Content Legal basis for traffic speed measuring instruments Technical basis for pattern evaluation and verification Harmonization with international requirements Future challenges 11

12 Technical basis Traffic speed measuring equipment for official use In China includes mainly the following categories: Radar Lidar Loop detector 12

13 Pattern Evaluation Simulation Influence Specification On-site RADAR 1 LIDAR Loop On-site test Influence test Simulation test 5 13

14 Pattern Evaluation 快车道 5.a 8.a 5.b 8.b 5.c 3.a 3.b 3.c 行车道 4.a 7.a 4.b 7.b 4.c 2.a 2.b 2.c 9 慢车道 1.a 6.a 1.b 6.b 1.c the average of speed errors of 500 measurements: (-4~0) km/h single speed error: 0 km/h 14

15 On-site test RADAR Reference (on-site) Reference (mobile) Calibration Devices 6 8 LIDAR 5 Loop 7 9 Real traffic Test vehicle 15

16 Technical basis The respective simulation technology have to be developed for simulation tests, either used in pattern evaluation or verifications. Simulation test for Radar: IACP Radar module, OIML R91 Simulation test for Lidar : 1. One beam IACP Lidar module 2. Two beams Time-delay principle Simulation test for Loop detector : 1. Active simulation 2. Passive simulation 16

17 Technical basis Simulation test for Lidar : 1. One beam IACP Lidar module 17

18 Technical basis Simulation test for Lidar : 2. Two beams Time-delay principle L1 L1 H L2 θ H L2 θ W W = SQRT(L1 2 + L1 2 2*L1*L2*cosθ) V = W ABS(T2-T1) 18

19 Technical basis Simulation test for Lidar : 2. Two beams Time-delay principle L1 L1 H L2 θ H L2 θ W 19

20 Technical basis Simulation test for Lidar : 2. Two beams Time-delay principle L1 TX RX L1 Virtual Distance Generator 180.0km/h L2 TX RX L2 Virtual Distance Generator Speed & Distance Control RS-232 RS-232 PC km/h - Set the Parameters (L1,L2 Detect range, Height) -Display detected speed PC km/h - Input the L1,L2 distance and angle - Input the test speed - Display Speed, Width, etc 20

21 Technical basis Simulation test for loop detector : 1. Active signal emission 21

22 Content Legal basis for traffic speed measuring instruments Technical basis for pattern evaluation and verification Harmonization with international requirements Future challenges 22

23 Harmonization Issue Is it an option or necessity for us? 1. OIML R91 recommendation 2. IACP standard series 3. China National Programs of Pattern Evaluation JJF Fixed-angle Radar Speed Measurement Devices 4. China National Technical Standards GB/T May Motor it be vehicle part of speed the answer? detector 23

24 Content Legal basis for traffic speed measuring instruments Technical basis for pattern evaluation and verification Harmonization with international requirements Future challenges 24

25 Legal challenges Future challenges More national norms, regulations and standards on Speed Meters of newly-developed types are needed, which are in accordance with the latest version of international standards and recommendations, etc., and which may result in Mutual Agreement Arrangement on speed meters in future. Technical challenges Research and development on simulation technology of the latest types and in-field test methods for periodical verification are focused, which will lay a solid foundation for legal metrology on speed meters. 25

26 Thank you for your attention!