GB/T 20609-2023Traffic information collection—Microwave traffic flow detector (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 20609-2006 "Microwave Traffic Flow Detector for Traffic Information Acquisition", and is consistent with GB/T 20609-2006 In addition to structural adjustments and editorial changes, the main technical changes are as follows.

---Changed the definitions of "microwave traffic flow detector", "occupied bandwidth", "spurious emission" and "head time" (see 3.1, 3.2, 3.3 and 3.8, 3.1, 3.5, 3.7 and 3.8 of the 2006 edition);

--- Deleted the terms "center frequency", "frequency tolerance", "beam width", "average power (of radio transmitter)", "vehicle distance" and Definitions (see 3.2, 3.3, 3.4, 3.6 and 3.9 of the 2006 edition);

---Increased "detection section", "traffic flow", "section average speed", "time occupancy rate", "inter-vehicle time distance", "equivalent omnidirectional radiation power" (eirp)" terms and definitions (see 3.4, 3.5, 3.6, 3.7, 3.9 and 3.10);

--- Changed the relevant provisions of the general requirements (see 4.1.1, 4.1.1 of the 2006 edition);

---Increased "vehicle flow", "average vehicle speed of section", "vehicle flow in divided lane", "average vehicle speed in divided lane", "time occupancy rate in divided lane" and "minute Relevant regulations on the average headway of a lane" and "average time headway by lane" (see 4.1.2, 4.1.3, 4.1.4, 4.1.5, 4.1.6, 4.1.7 and 4.1.8);

---Changed the "detection distance" regulations (see 4.2, 4.1.2.1 of the 2006 edition);

---Deleted the "detection accuracy" provisions (see 4.1.2.2 of the 2006 edition);

---Change "wireless performance requirements" to "radio frequency performance requirements" (see 4.3, 4.2 of the 2006 edition);

---Deleted the "center frequency" provisions (see 4.2.1 of the 2006 edition);

--- Increase the "frequency range" provisions (see 4.3.1);

--- Delete the "frequency tolerance" provisions (see 4.2.2 of the 2006 edition);

---Changed the "occupied bandwidth" provisions (see 4.3.2, 4.2.3 of the 2006 edition);

--- Increase the "transmission power" provisions (see 4.3.3);

---Deleted the "average power" provisions (see 4.2.4 of the 2006 edition);

---Changed the provisions of "spurious emissions" (see 4.3.4, 4.2.5 of the 2006 edition);

---Delete the provisions of "antenna performance requirements" (see 4.2.6 of the 2006 edition);

--- Changed the relevant regulations on communication interface, communication rate and data acquisition (see 4.4.1, 4.4.3 and 4.4.4, 4.3.1, 2006 edition 4.3.3 and 4.3.4);

---Deleted the relevant provisions of "synchronous mode", "external timing mode" and "internal clock" (see 4.4.1, 4.4.2 and 2006 edition 4.4.3);

---Changed the provisions of "synchronization requirements" (see 4.5, 4.4 of the 2006 edition);

--- Change "power supply" to "power supply adaptability", and change the relevant regulations (see 4.10.1, 4.9.1 of the 2006 edition);

--- Change "storage capacity" to "storage", and change the relevant regulations (see 4.10.2, 4.9.2 of the 2006 edition);

--- Changed the "operating temperature" (see 4.10.3.2, 4.9.3.2 of the 2006 edition);

--- Deleted "test equipment and requirements" (see 5.1 of the 2006 edition);

--- Increase the "detection distance test" provisions (see 5.2);

---Change "wireless performance parameter test" to "radio frequency performance test" and change the relevant regulations (see 5.3, 5.3 of the 2006 edition);

---Changed the provisions of "interface test" (see 5.4, 5.4 of the 2006 edition);

--- Increase the "synchronous test" provisions (see 5.5);

---Changed the provisions of "power adaptability" (see 5.10.1, 5.9.1 of the 2006 edition);

--- Change "storage capacity" to "storage", and change the relevant regulations (see 5.10.2, 5.9.2 of the 2006 edition);

---Changed the provisions of "inspection items" (see Table 3, Table 1 of the 2006 edition);

---Changed the provisions of "product logo" and "package logo" (see 7.1.1, 7.1.2, 7.1.1, 7.1.2 of the 2006 edition);

---Changed the provisions of "packaging" (see 7.2, 7.2 of the 2006 edition);

--- Deleted "main test equipment requirements" (see Appendix A of the 2006 edition);

--- Deleted the description of the test function in the test environment requirements (see B.1 of the 2006 edition);

--- Changed the test environment and project table (see Table A.1, Table B.1 of the 2006 edition);

--- Changed the requirements for test environment conditions (see A.1.2, B.1 of the 2006 edition);

--- Changed the schematic diagram of the test environment of the real road section (see Figure A.1, Figure B.1 of the 2006 edition);

---Changed the regulations on the installation of real road section detectors and traffic flow sampling (see A.1.4, A.1.5, B.1 of the 2006 edition);

--- Changed the schematic diagram of the test environment of the proving ground (see Figure A.2, Figure B.2 of the 2006 edition);

--- Changed the regulations on the test environment of the proving ground (see A.1.7, A.1.8, A.1.9, B.1 of the 2006 edition);

--- Increase the scope of application of the traffic flow test method (see A.2.1);

---Changed the calculation formula of traffic flow detection accuracy [see formula (A.1), formula (B.1) of the 2006 edition];

--- Change "average speed test" to "section average speed test" (see A.3, B.3 of the 2006 edition);

--- Increase the scope of application of the test method for the average vehicle speed (see A.3.1);

--- Increased the provisions of the speed test equipment (see A.3.3);

---Changed the calculation formula of average vehicle speed detection accuracy [see formula (A.2), formula (B.2) of the 2006 edition];

--- Change the "time occupancy test" to "lane time occupancy, average headway, average headway test" (see A.4, B.4 of the 2006 edition);

---Changed the calculation formula of the detection accuracy of lane-dividing time occupancy [(see formula (A.3), formula (B.3) of the 2006 edition];

--- Added the test method and calculation formula of the detection accuracy of the average headway of the lanes and the average headway of the lanes (see A.4.4, A.4.5);

--- Changed the detector installation distance of the detection distance test (see A.5.1, B.5.1 of the 2006 edition);

---Deleted the provisions of the detection distance test under special requirements (see B.5.6 of the 2006 edition);

--- Changed the detection distance test regulations (see A.5.3, B.5.3, B.5.4, B.5.5 of the 2006 edition);

--- Added "Test Result Record Form" (see Appendix B);

--- Increased the provisions of "radiation test site" (see Appendix C);

---Delete the provisions of "Wireless Performance Parameter Test" (see Appendix C of the 2006 edition);

--- Increased the provisions of "radiation general test method" (see Appendix D).

1 Scope

This document specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of microwave traffic detectors.

This document applies to microwave traffic flow detectors for measuring vehicle traffic parameters on roads.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 191 Packaging, storage and transportation icons

GB/T 2423.1 Environmental testing for electrical and electronic products - Part 2: Test methods Test A. Low temperature

GB/T 2423.2 Environmental testing for electric and electronic products - Part 2: Test methods Test B. High temperature

GB/T 2423.3 Environmental testing - Part 2: Test methods Test Cab. Constant damp heat test

GB/T 2423.5 Environmental testing - Part 2: Test methods Test Ea and guidelines. Shock

GB/T 2423.10 Environmental testing Part 2: Test method Test Fc. Vibration (sinusoidal)

GB/T 4208-2017 Enclosure protection level (IP code)

GB/T 4892 Rigid cuboid transport packaging dimension series

GB/T 5080.7 Verification test plan for failure rate and mean time between failures under the assumption of constant failure rate for equipment reliability test

GB/T 9254.2 Electromagnetic compatibility of information technology equipment, multimedia equipment and receivers Part 2: Immunity requirements

GB/T 13384 General Technical Specifications for Packaging of Mechanical and Electrical Products

3 Terms and Definitions

The following terms and definitions apply to this document.