When the road parking geomagnetism enters a large-scale replacement period, the selection of high-quality geomagnetic sensor requires comprehensive consideration of technical performance, environmental adaptability, cost-effectiveness, supplier strength and other aspects.
I. Technical performance
1. Detection accuracy
• Detection rate: Select products with a detection rate of ≥99% to ensure high accuracy of vehicle presence detection.
• Multi-mode detection: Give priority to dual-mode or multi-mode geomagnetic detectors, such as products that combine magnetic resistance detection, microwave radar detection and illumination detection technology, which can maintain high detection accuracy in complex environments (such as rainy and snowy weather, strong electromagnetic interference).
• Anti-interference ability: The product should have an adaptive filtering algorithm that can effectively eliminate strong electromagnetic interference such as subways and trams, and the false detection rate is less than 0.1%.
2. Communication technology
• Wireless communication: Support NB-IoT and LoRa communication technologies to ensure stable data transmission and low power consumption
• Network stability: For areas with unstable NB network coverage, dual-network geomagnetism can be selected to support automatic network switching.
3. Service life
• Battery life: Choose products with a service life of ≥5 years, and some high-quality products can reach more than 8 years
• Low power design: Use low-power chips and optimized circuit design to extend battery life.
4. Environmental adaptability
• Waterproof and dustproof level: The shell protection level should reach IP68 to ensure normal operation in bad weather.
• Temperature range: The operating temperature range should cover -40℃ to +85℃.
• Pressure resistance: The shell material must be strong and able to withstand frequent vehicle rolling.
II. Product design and installation
1. Installation convenience
• Wiring-free design: No need to break the road for wiring, reducing construction costs and time.
• Automatic networking: Supports automatic networking with the host or gateway.
2. Shell design
• Double-layer waterproof shell: Removable design facilitates maintenance and troubleshooting.
• Internal component stability: Welded NB patch cards are more stable than plug-in card slots and have better high and low temperature resistance.
3. Compatibility
• System compatibility: ensure that the product is seamlessly connected with the existing parking management system or traffic management platform.
• Multiple network support: support multiple communication modes, such as NB-IoT, LoRa, 4G, etc.
III. Cost and benefit
1. Cost performance
• Under the premise of meeting technical requirements, choose reasonably priced products to avoid choosing low-quality geomagnetic magnets for cheapness.
• Consider the long-term maintenance cost and replacement frequency of the product, and choose low-maintenance and long-life geomagnetic magnets.
2. Long-term benefits
• Choose products that support remote configuration and debugging to reduce on-site maintenance workload.
• Consider the scalability of the product to adapt to future technology upgrades.
IV. Supplier strength and service
1. Supplier strength
• Choose suppliers with strong technical strength and good market reputation, and give priority to manufacturers with successful cases, such as COMA geomagnetic magnets.
• Suppliers should have independent research and development capabilities and be able to provide continuous technical support.
2. After-sales service
• Provide comprehensive after-sales support, including product training, technical support and fast repair services.
3. Field testing
• After selecting multiple products with good quality, conduct field comparison tests, especially in complex environments (such as busy streets and subway lines) to verify their detection accuracy and response time.
V. Actual application scenarios
1. Urban environment
• For cities with stable NB network coverage, dual-mode geomagnetism can be selected.
• For areas with ice and snow seasons or heavy rain, three-mode geomagnetism is preferred.
2. Special areas
• In areas with unstable NB network coverage or poor signal quality, choose dual-network geomagnetism.
• For areas with high electromagnetic interference (such as subway lines), choose products with strong anti-interference ability.
Summary
When selecting high-quality geomagnetic sensors, it is necessary to comprehensively consider technical performance, environmental adaptability, cost-effectiveness, supplier strength and actual application scenarios. It is recommended to give priority to dual-mode or multi-mode geomagnetism, support multiple communication technologies, have high waterproof and dustproof levels and long service life. At the same time, field tests are carried out and suppliers with good after-sales services are selected to ensure smooth implementation of the project and reduce long-term operational risks.