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With the development of the national economy, people’s requirements for travel are getting higher and higher, especially as private cars enter thousands of households, traffic problems have become one of the most concerned issues of the majority of car owners. As of 2010, there are more than 4 million motor vehicles in Beijing and more than 1.7 million motor vehicles in Shenzhen. The control of congestion has also become an urgent problem for government departments at all levels to solve.
In recent years, the government has successively carried out safety projects in some cities, part of which is focused on traffic. The method is to use video signals back to the central computer room to manually judge whether the road is jammed or video to judge whether there is a traffic jam. To judge whether there is traffic jam by way of video monitoring, one is that the investment is relatively large, and the other is that in the central computer room, most of the traffic jams are observed through video switching. Only part of the main roads can be monitored, and the degree of intelligence is relatively low.
ããOne program introduction
With the development of IoT technology, some emerging technologies will gradually be applied to smart transportation. The following describes the application of IoT sensing technology in smart transportation.
1 System scheme diagram
The following is a diagram of the scheme realized by RFID:
The principle is to arrange RFID active electronic tags on the road lanes (which can be called ground-sensing tags in this scheme), and periodically read the ground-sensing tags through the RFID magnetic sensor recognizer (see whether there are vehicles on the ground-sensing tags) and The corresponding information is transmitted to the central management platform through the 3G network or GPRS network, and the central management platform performs cloud computing on the information, and then determines whether there is a traffic jam and provides the best driving route to the corresponding car owner.
This solution mainly introduces how to identify whether the road is congested through the sense of ground tags, the cloud computing function of the central management platform and how to provide the best driving route for car owners in the background, etc., which are only mentioned in the following discussion without further elaboration.
2 Implementation description
ã1) In order to judge whether the traffic jam and its seriousness, the ground sense labels can be placed at 30 meters, 80 meters, and 130 meters from the intersection.
2) The vehicle body is generally about 3 meters long. When traffic jams, to ensure that there is a vehicle just above the ground sensing label, when the ground sensing label is arranged, three labels are generally arranged, and one ground sensing label is arranged every 1 meter.
3) The RFID magnetic sensor can be set to read the ground-sensing tags regularly, such as reading once every 1 minute. When there is a car above the ground sensing tag, the RFID magnetic sensor will return a value when reading the ground sensing tag; when there is no car above the ground sensing tag, the RFID magnetic sensing identifier will return another value when reading the ground sensing tag. . The central management platform judges whether there is a traffic jam based on these returned values.
4) If the system judges that there is a car at 30 meters, but the distance between 0-30 meters is relatively short, it can be regarded as normal road conditions; if there is a car at 80 meters, it means that there are cars at 0-80 meters, which can be regarded as slight Congestion; if there is a car at 130 meters, it means that there are all cars in the 0-130 meters section, which can be understood as serious congestion. Here it is assumed that there are no special circumstances such as vehicle failures or other abnormalities on the road. Special circumstances will be mentioned in the following discussion.
3 Description of geo-sensing label performance
1) Performance characteristics
Automatically detect whether there is a car above.
Low power consumption, more than 6 years of service life.
The construction is simple, the screw can be fixed, it is installed in the center of the road, and the size is small and the shape is beautiful.
It can withstand more than 8 tons of pressure (can be designed according to requirements).
2) Technical specifications
Size: 126x126x34mm (can be designed separately)
Sensitivity: -103dBm
Transmitting power: <0dBm
Power supply: 1200mAh
Working frequency: 2.4GHz
Data transmission speed: 1Mbits/S
Data modulation method: GFSK
Working temperature: -40?CīŊ+80?C
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