GB/T 20609-2023 in English
VALIDTraffic information collection—Microwave traffic flow detector
- Issued on:2023-03-17
- Implemented on:2023-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$400.00
$388.00
$388.00
《GB/T 20609-2023交通信息采集 微波交通流检测器》由TC268（全国智能运输系统标准化技术委员会）归口，主管部门为国家标准委。
Introduction
Background of Standard Revision and Technological Evolution
GB/T 20609-2023, as the first revision of the 2006 version of the standard, reflects the significant progress in microwave detection technology in the past 17 years:
| Technical Dimensions | 2006 Version | 2023 Version | Evolutionary Characteristics |
|---|---|---|---|
| Detection Parameters | 5 Basic Parameters | Added 7 items such as Time Between Vehicles by Lane | Multi-dimensional Refined Detection |
| RF Performance | 6 Indicators | Optimized to 4 Core Indicators | Strengthen Spectrum Management |
| Detection distance | Not clearly defined | ≥45m mandatory requirement | Adapt to complex road conditions |
| Environmental adaptability | -20℃~+55℃ | -40℃~+70℃ | Adapt to extreme climates |
Analysis of core technical requirements
4.1 Functional requirements
The new version of the standard clearly divides the detection mode into two types: lateral detection and forward detection:
- Lateral mode: The detection section is perpendicular to the direction of traffic flow, and 95% traffic flow detection accuracy must be achieved
- Forward mode: the detection section is parallel to the direction of traffic flow, and supports simultaneous detection of multiple sections
Update of key calculation formulas:
Average vehicle speed V in section = (1/N)∑v_i (Formula 1) Lane time occupancy rate R_l = (1/T)∑t_i×100% (Formula 3)
4.3 RF performance requirements
Comparison of main technical indicators:
| Parameter | Required value | Test method |
|---|---|---|
| Frequency range | 24~24.25GHz | Appendix D Alternative method |
| Occupied bandwidth | ≤250MHz | 99% energy method |
| Transmit power | ≤20mW(eirp) | Duty cycle correction |
| Spurious emission | Classification limit (Table 1) | Full anechoic chamber test |
Implementation suggestions and precautions
Equipment selection suggestions
- Give priority to equipment that supports NTP/PTP time synchronization (error ≤10ms)
- Confirm that the equipment has IP65 protection grade and -40℃~+70℃ operating temperature range
- Verify that the 24GHz frequency band transmission power spectrum density is ≤-80dBm/Hz
Installation and debugging points
According to Appendix A requirements:
- The recommended installation height for lateral mode is 6m, and the vertical distance of the detection section is ≥45m
- A laser rangefinder is required to calibrate the installation position
- The actual road test traffic volume should be ≥1000 vehicles/hour
Standard application case
Upgrade of a city's expressway monitoring system: After adopting the microwave detector that complies with the 2023 version of the standard:
- The average speed detection accuracy of each lane is improved from 89% to 96%
- MTBF is increased to 32,000 hours at -25℃
- Reduce spectrum interference complaints by 30% through RF performance optimization
Sample only — not a preview of GB/T 20609-2023
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