Application of RFID long-distance card reader in BRT, intelligent transportation ITS, ETC
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1.introduce
RFID technology has been widely used in the transportation field, especially in intelligent transportation ITS, rapid transit BRT and other application fields has a very broad application prospects. In addition to the very common application of bus cards, non-stop toll ETC system, etc., it is also used in quantity statistics, speed calculation, access control, etc. Some of these application cases are listed below.
The RFID-based vehicle dispatch system of the Ministry of Railways of China. The Ministry of Railways of China has already added RFID tags to the 550,000 locomotives and carriages under its jurisdiction to realize the tracking of the vehicles or carriages, as well as the road condition alarms during the operation of the vehicles.
Information management of Shanghai bus arrivals and departures shows the name, location and time of the upcoming and upcoming bus on the display screen installed on the platform.
The bus priority system of Hangzhou, Zhejiang. Hangzhou City has installed RFID equipment at 31 light-controlled intersections on its BRT Line 1. When the bus approaches 200 meters from the intersection, the RFID equipment can read the information of the bus. According to needs, and with the cooperation of signal control equipment, appropriately adjust the time of the traffic lights to realize the priority of public transportation.
Beijing, Jinan, Kunming, Guangzhou, Chongqing, Hefei, Xiamen and other large and medium-sized cities have opened or will soon open BRT rapid transit systems. The BRT rapid transit system plays a very important role in improving citizens’ travel efficiency, alleviating urban traffic pressure, and providing public transportation efficiency. The state has included the construction of intelligent transportation in the “Tenth Five-Year Plan” science and technology plan to provide key support. Many large and medium-sized cities are successively applying for the establishment of urban intelligent transportation demonstration bases. It is understood that the state has approved the first batch of 12 cities to establish such demonstration bases. The emergence of BRT can vigorously develop public transportation. With the help of digital and intelligent urban public transportation management, the efficiency of public transportation operation management and the level of social services have been improved.
What is a rapid transit?
Bus Rapid Transit (BRT) for short, is a new type of public passenger transportation system between Rapid Rail Transit (RRT) and Normal Bus (Normal Bus Transit, NBT). The volume of transportation is usually called “the subway system on the ground”. It is a unique urban passenger transport system that uses modern bus technology to cooperate with intelligent transportation and operation management, opens dedicated bus roads and builds new bus stations, realizes rail transit operation services, and reaches the service level of light rail.
Take the B1 line of BRT that has been opened in Hangzhou as an example to see how the BRT system works.
On Hangzhou’s BRT lines, buses can pass through intersections quickly and increase the flow of buses to ensure smooth roads. So, how to make the bus pass through the intersection with the constant flow of traffic first? RFID played a magical power in it.
Hangzhou BRT Line 1 is an east-west line running through the middle of Hangzhou, with a total length of 28 kilometers. It starts from Huanglong Bus Station in the west, passes through Tianmushan Road, Huancheng North Road, Genshan East Road and other roads, and ends at Xiasha Higher Education East District in the east. It runs through 6 administrative districts, connecting the main city of Hangzhou and the sub-city of Xiasha. In the initial stage of opening, there will be 13 pairs of stopovers with an average distance of 2 kilometers. According to the final design requirements, Hangzhou BRT Line 1 will set up 23 pairs of stopovers with an average distance of 1.17 kilometers.
To realize rapid transit, the most important problem to be solved is signal priority. How to know that the bus will arrive at the intersection and adjust the traffic light signal in time? Install RFID tags at the front of the express bus to record vehicle information, and install SCATS signal control equipment and RFID vehicle identification systems at 31 light-controlled intersections along the road. When the bus drives to a place 200 meters away from the intersection, set The RFID reading device close to the intersection can collect the information of the bus, and appropriately extend the time of the green light or shorten the time of the red light as needed. Statistics from the traffic management department show that the average signal priority time for each intersection is 8 seconds.
After the RFID vehicle identification system cooperates with the networked area control of the traffic signal, it can accurately locate the vehicle and quickly adjust the signal light. According to the person in charge of the project, Beijing’s BRT uses GPS to solve the problem of location recognition, but the positioning is not very accurate. In foreign countries, infrared recognition is usually used, and priority is enforced as long as it is recognized. Domestic intersections are more complicated than foreign countries. Much, this approach may not be suitable for China. The current RFID rapid transit solution adopted by Hangzhou is also based on needs, giving priority to public transportation at the right time to increase traffic. If it is running on time, the system will not take precedence after judgment. If it is late, it will take precedence. If the east-west traffic is on time and the north-south direction is late, the north-south direction will pass first.
Nowadays, Hangzhou’s BRT lines are usually mainline vehicles on important road sections. At present, about 80 buses are affixed with electronic tags. The operation efficiency of BRT has increased by 60%, which greatly facilitates the operation of bus lines. It is understood that during the “Eleventh Five-Year Plan” period, Hangzhou will complete the construction of 9 rapid transit lines, and RFID will also show its magic.
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Shanghai Xiupai Electronic Technology Co., Ltd., as the domestic leader in long-distance RFID radio frequency identification equipment, its excellent quality and stable performance will play a pivotal role in the promotion and application of BRT. The signal of SP-RFS-300 long-distance card reader can effectively pass through the car metal film, the signal coverage angle can be adjusted (45-360 degrees), the recognition distance is longer (0-100 meters or more), and the car can still pass through at a speed of more than 200 kilometers per hour. Reliable reading, better anti-collision performance (read more than 200 cards each time). Due to the circularly polarized antenna, there is no requirement for the placement angle of the card, and it does not need to be attached to the windshield. No matter how it is placed, it can be read reliably. Specifically in:
1>Long distance: The effective reading distance between the reader and the card is 0～100 meters;
2>Circularly polarized antenna: The design of the reader’s receiving antenna adopts a circularly polarized antenna, which has no direction requirements for card placement;
3>High speed: when the vehicle-mounted card moves at a speed of 0～200 km/h, the reader can correctly identify the card signal;
4>Long time: The electronic label can work continuously for 6-8 years without maintenance during the period. This reduces maintenance costs for users and management, and directly improves economic benefits.
1.1 Features
Long distance: the effective recognition distance is adjustable from 0 meters to 100 meters
Recognition direction can be adjusted: the signal transmission angle can be adjusted from 45 degrees to 360 degrees to meet the different requirements of orientation and omnidirectional.
Extremely high anti-collision: It adopts multiple anti-collision schemes, reliable frequency division multiple access and time division multiple access design, and can identify more than 200 different RFID cards at the same time.
High speed: Super RFID can reliably read the electronic tag even at a moving speed of more than 200 kilometers per hour.
Intelligentization: Two-way high-speed data exchange can be realized between RFID and transceiver, making application flexible and ensuring data security.
High reliability: adapt to the working environment of industrial and mining (-40℃-85℃), and pass the national coal mine safety certification. Waterproof and shockproof.
Ultra-low power consumption: The peak transmit power is only 1mw, which is healthier and safer.
Frequency band selection: The ISM microwave frequency band is open worldwide, no application and payment are required.
High anti-interference: no special requirements for various interference sources on site.
Highly integrated: easy to install, the built-in antenna does not require an external antenna or coil
High degree of security: The encryption algorithm of Showpad is used to ensure the absolute security of data transmission.
Circular polarization antenna design: The circular polarization antenna design is adopted to ensure that the electronic tag can be read and written reliably regardless of the angle at which the electronic tag is placed.
Development interface: Provide SDK development kit, interface function API, convenient for customers to develop their own characteristic applications.
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1.2 Product specifications
Dimensions: 260mm×260mm×70mm
Weight: 4.4 kg
Shell material: ABS, cast aluminum alloy
Color: gray
Installation location: Benchmark or beam
Installation method: vertical hanging or top hanging
Signal modulation method: GFSK
Frequency: 2.4-2.4835 GHz
Transmitting power: ≤0dBm (software adjustable)
Antenna polarization: circular polarization
Microwave communication distance: 2–80m
Microwave communication area adjustment: adjust the communication area range through the attenuator
Microwave communication error detection: CRC16 cyclic redundancy check
Communication encryption: temporarily undisclosed
Bit error rate: /BER 10-7
Power source: RS232/485 mode: +6-+12V DC (MAX 500mA)
Communication interface: RS232/485/Wigan
Baud rate: 4800-115200
Development interface: Provide SDK development kit, interface function API, convenient for customers to develop their own characteristic applications.
Communication error detection: CRC16 cyclic redundancy check
Operating temperature: -40℃ — +80℃
Storage temperature: -60℃ — +80℃
Anti-electromagnetic interference: 10V/m 0.1-1000MHz AM electromagnetic wave
Reliability: MTBF≥70000 hours
Working life: more than 15 years
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1.3 Enterprise background
As the current leader in technology and productization in the domestic RFID field, Supai has successfully attracted the internationally renowned venture capital institution “IDG Technology Venture Investment III (LP)” relying on the technological advantages of Shanghai Jiaotong University. It is also the first company in the domestic RFID industry to be invested by international venture capital.
Showpai’s long-distance radio frequency identification equipment uses the most advanced 0.18uM microwave chip technology, which makes the performance of RFID substantially improved compared with the original microwave technology, and completely solves the problem of long-distance, large flow, and ultra-low power. The identification and data transmission of high-consumption and high-speed moving markers are difficult, and the cost is greatly reduced compared with the past. At the same time, it also solves the fatal weakness of low-frequency electromagnetic wave technology with short sensing distance and poor anti-collision capabilities. Its various technical indicators are in the leading position in the industry among similar products, creating a new era of long-distance recognition technology.
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