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JJF 1921-2021 English PDF

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JJF 1921-2021: Calibration Specification for GNSS Vehicle Travelling Data Recorders
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Standard similar to JJF 1921-2021

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Basic data

Standard ID JJF 1921-2021 (JJF1921-2021)
Description (Translated English) Calibration Specification for GNSS Vehicle Travelling Data Recorders
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A50
Word Count Estimation 24,261
Issuing agency(ies) State Administration for Market Regulation

JJF 1921-2021: Calibration Specification for GNSS Vehicle Travelling Data Recorders

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(GNSS data recorder display instructions) National Metrology Technical Specification of the People's Republic of China GNSS tachograph calibration specification Published on 2021-10-18 2022-04-18 Implementation Released by the State Administration for Market Regulation GNSS tachograph calibration specification Focal Point. National Technical Committee for Measurement and Testing of Satellite Navigation Applications Main drafting unit. Beijing Institute of Metrology and Testing Sciences Participating in the drafting unit. Guangdong Institute of Metrology Jiangsu Institute of Metrology Shandong Institute of Metrology This specification is entrusted to the National Satellite Navigation Application Special Measurement and Testing Technical Committee to be responsible for the interpretation The main drafters of this specification. Xu Yuan (Beijing Institute of Metrology and Testing) Huang Yan (Beijing Institute of Metrology and Testing) Tan Hengyu (Beijing Institute of Metrology and Testing) Participating drafters. Zhou Guangyong (Guangdong Institute of Metrology) Wu Jun (Jiangsu Institute of Metrology) Guan Zexin (Shandong Institute of Metrology)

content

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms (1) 3.1 Positioning deviation (1) 3.2 Speed deviation (1) 4 Overview(1) 5 Metrology Characteristics(2) 5.1 Positioning deviation (2) 5.2 Speed deviation (2) 5.3 Mileage record error(2) 5.4 Time recording error(2) 5.5 Sensitivity(2) 6 Calibration Conditions(2) 6.1 Environmental conditions (2) 6.2 Main calibration equipment(2) 7 Calibration items and calibration methods (3) 7.1 Calibration items(3) 7.2 Calibration method(3) 8 Expression of calibration results (6) 9 Recalibration interval(7) Appendix A Calibration Raw Record Reference Format(8) Appendix B Calibration Certificate Inner Page Format (10) Appendix C Example of Uncertainty Evaluation of Calibration Results of Main Items (12) Appendix D Standard Scenario Description (18)

Introduction

JJF 1071-2010 "Rules for the Compilation of National Metrology Calibration Standards", JJF 1001 "General Metrology Terms and Definitions" JJF 1059.1-2012 "Assessment and Representation of Measurement Uncertainty" together constitute the basis for the preparation of this specification Series Specifications. This specification is published for the first time. GNSS tachograph calibration specification

1 Scope

This specification applies to the calibration of vehicle tachographs for road transport vehicles using satellite navigation operating mode.

2 Reference documents

This specification references the following documents. JJF 1001-2011 "General Metrology Terms and Definitions" JJF 1180-2007 "Terms and Definitions of Time and Frequency Measurement" JJF 1403-2013 "Global Navigation Satellite System (GNSS) Receiver (Time Measurement Type)" GB/T 19056-2012 "Car Driving Recorder" For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Terminology

3.1 Positioning bias positionbias The deviation of the position value recorded by the car tachograph from the standard position value. 3.2 Velocitybias The deviation of the speed value measured by the tachograph from the standard speed value.

4 Overview

The tachograph is the information on the vehicle position, driving speed, mileage, time and other status information about the driving of the vehicle. It is a digital electronic recording device that records and stores information and realizes data output through data communication. driving recorder Mainly composed of microprocessor, data memory, display, data communication interface, display, micro printer, internal time It consists of clock, data input device, vehicle speed sensor (satellite navigation and positioning module), etc. (see Figure 1).

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