Multi-geomagnetic Sensor Speed Measurement System
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Solution Overview
Problem
Conventional vehicle speed measurement systems face issues with accuracy, reliability, and safety due to environmental factors and complex traffic conditions, often resulting in incorrect or missed vehicle detections, especially in adverse weather and multi-vehicle scenarios.
Innovation Solution
A multi-geomagnetic sensor speed measurement system comprising geomagnetic vehicle detection modules, data transmission, and backend processing modules, which deploy multiple geomagnetic sensors along the roadside to collect and process magnetic field data, using data cleaning and alignment techniques to accurately estimate vehicle speed through the minimum variance method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional geomagnetic sensors are used for vehicle speed measurement, then the system is simple and low-cost, but the measurement accuracy deteriorates when multiple vehicles drive side by side or large vehicles pass in adjacent lanes
Solution Approach 1:
The patent divides the detection area into multiple zones by deploying multiple geomagnetic sensors (at least three sensors) along the roadside. Each sensor monitors a specific segment of the road, allowing the system to distinguish between vehicles in different lanes and accurately measure speed even when multiple vehicles are present simultaneously.
Solution Approach 2:
The patent combines data from multiple geomagnetic sensors to achieve accurate speed measurement. By merging the detection results from multiple sensors that monitor different spatial zones, the system overcomes the limitations of single-sensor systems and maintains high accuracy in complex traffic conditions.
2Measurement precision
If optical sensors are used for speed measurement, then the system can provide accurate measurements in clear weather, but the reliability deteriorates in bad weather such as haze
Solution Approach 1:
The patent replaces optical sensing mechanisms with geomagnetic sensing mechanisms. Geomagnetic sensors detect changes in the Earth's magnetic field caused by vehicles, a method that is independent of weather conditions such as haze, fog, or rain, thereby ensuring reliable operation in all weather scenarios.
3Ease of operation
If inductive coil sensors are used for speed measurement, then the system can detect vehicle presence, but the duration of action deteriorates due to short life span
Solution Approach 1:
The patent replaces inductive coil sensors with geomagnetic sensors. Geomagnetic sensors have no moving parts and are solid-state devices, which significantly extends their operational lifespan and reduces maintenance requirements compared to inductive coil systems.
4Speed
If microwave radar is used for speed measurement, then the system can measure vehicle speed, but the reliability deteriorates when multiple vehicles are present due to incorrect detection
Solution Approach 1:
The patent segments the detection space into multiple distinct zones using multiple geomagnetic sensors positioned at different locations. This spatial segmentation allows the system to track and measure each vehicle independently, eliminating the interference and incorrect detection problems that occur with radar systems when multiple vehicles are present.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces errors in vehicle speed measurement, enhances reliability and safety, and is less affected by environmental factors, providing accurate speed data even in complex traffic conditions and adverse weather.
Implementation Method 1
The geomagnetic sensors are used to collect magnetic field data from the road surface
Data Source
AI summary
A multi-geomagnetic sensor speed measurement system comprises a geomagnetic vehicle detection module, a data transmission module, a data reception module and a backend data processing module. When measuring, the geomagnetic vehicle detection module collects the geomagnetic data when the vehicle passes and processes it to obtain temporal data; the backend processing module receives the data for data cleaning; the backend processing module selects the reference sensors and opens individual time windows; the backend processing module processes the temporal data based on the number of temporal data in the time window; in the case of duplicate-detection, a measurement threshold δ is set and the temporal data is merged based on the threshold δ; in the case of mis-detection, the data is interpolated to make up for the mis-detection; based on the alignment result, a minimum variance method is used to estimate the speed of the vehicle.