Underground traffic light control system based on UWB and RFID fusion accurate positioning

Abstract

The utility model discloses an underground traffic light control system based on UWB and RFID fusion accurate positioning. The underground traffic light control system comprises a physical layer part, a network layer part and an application layer part. The network layer part is connected with the physical layer part and the application layer part; the physical layer part comprises a UWB tag card, an RFID tag card, an antenna, a card reader and an LED display screen; the network layer part comprises a mining 10-gigabit switch, the application layer part comprises a monitoring host and a monitoring standby, the application layer part is arranged outside a mine, and the physical layer is arranged inside the mine; according to the utility model, the UWB and RFID fusion technology is used for distance measurement to obtain the distance between personnel and vehicles, the rapidness and reliability of traffic light switching are ensured through distance judgment, and the passing efficiency and safety of vehicles and personnel in a roadway are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mine under red green light control system based on UWB and RFID fusion precision positioning. BACKGROUND

[0002] In some large or above mine construction or implementation process, the roadway inside the mine needs to meet the normal traffic of vehicles and personnel, and most of the roadways are interconnected, and the vehicles transport the raw materials inside the mine through the roadway; the roadway is greatly affected by the geographical environment in the construction process, so the construction difficulty is also relatively high, which also makes the traffic space inside the roadway limited, and the limited space also affects the line of sight when the vehicle and pedestrian drive or walk, therefore, the red green light system is set at the intersection inside part of the mine roadway, which is similar to the red green light lighting mode of the outdoor road surface road to allocate the traffic of vehicles and pedestrians at the intersection inside the roadway, but the existing red green light system inside the roadway has low intelligence, and the red green light switching is carried out by setting fixed time, cannot be switched in real time according to the actual road condition inside the roadway, to a certain extent, the traffic rate of the vehicle and pedestrian inside the roadway is affected, and the rapid passing of some special or emergency vehicles and pedestrians is also affected, which affects the smooth development of the work under the mine, therefore, a new type of mine under red green light control system needs to be researched and developed. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved by the utility model is to provide a red green light control system that can solve the problem of complex scenes under the mine, the distance of personnel and vehicles is obtained by using UWB and RFID fusion technology, the rapidness and reliability of red green light switching are ensured through distance judgment, and the utility model has practicality and wide applicability, and the mine under red green light control system based on UWB and RFID fusion precision positioning

[0004] To solve the above problems, the utility model adopts the following technical scheme:

[0005] A mine under red green light control system based on UWB and RFID fusion precision positioning is composed of a physical layer part, a network layer part and an application layer part;The physical layer part includes a UWB tag card, an RFID tag card, an antenna, a card reader and an LED display screen;The network layer part includes a mine ten thousand switch, and the mine ten thousand switch includes a mine ten thousand switch main machine and a plurality of mine ten thousand switch extension machines, and the mine ten thousand switch main machine and the plurality of mine ten thousand switch extension machines form an industrial Ethernet transmission platform;The application layer part includes a monitoring host computer and a monitoring standby machine, and the monitoring host computer and the monitoring standby machine form a central computer server;The physical layer part, the network layer part and the application layer part are connected in sequence, the application layer part is arranged outside the mine, and the physical layer is arranged inside the mine.

[0006] Preferably, the monitoring host and the monitoring backup machine are connected to a mining 10 Gigabit switch host; the mining 10 Gigabit switch host is connected to multiple mining 10 Gigabit switch extensions.

[0007] Preferably, each of the 10G mining switch extensions is connected to a card reader, which is connected to an LED display screen and an antenna.

[0008] Preferably, the antenna is connected to the UWB tag and the RFID tag via a wireless carrier signal, and the UWB tag transmits the wireless carrier signal periodically; and the RFID tag and the antenna perform uninterrupted wireless carrier signal transmission.

[0009] Preferably, a controller is connected between the card reader and the LED display screen, and the controller is connected to the card reader and the LED display screen via RS485.

[0010] Preferably, the LED display screen, controller, card reader and antenna are arranged at the intersection of roads under the mine.

[0011] The beneficial effects of the utility model are:

[0012] 1. High degree of intelligence: the system automatically adjusts the traffic order based on the collected information. There is no need for manual switching of traffic lights, nor is there a need for a large number of UWB devices to be connected, making traffic at lane intersections smoother.

[0013] 2. Strong initiative. The system uses real-time positioning and speed measurement of vehicles to generate traffic light conversion rules, giving drivers greater initiative and eliminating the situation where ground drivers have to passively stop and wait.

[0014] 3. Visualization: The system detects signals through UWB and RFID, and then uploads the received information, which can be displayed on a three-dimensional map through a model to achieve visualization. At the same time, it can directly guide vehicle routes, making it easier for vehicles and personnel to pass through mine tunnels, greatly improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art, but this does not limit the scope of protection of the present invention.

[0016] Figure 1 This is a schematic diagram of the system structure framework of the utility model;

[0017] Figure 2 This is a schematic diagram of the connection of the physical layer of the present utility model;

[0018] Figure 3The utility model discloses a UWB label card signal transceiver time schematic diagram.

[0019] Figure 4 The utility model discloses a physical layer part underground setting schematic diagram.

[0020] Figure 5 The utility model discloses an embodiment one road condition traffic schematic diagram.

[0021] Figure 6 The utility model discloses an embodiment two road condition traffic schematic diagram. Specific implementation

[0022] Referring to Figures 1 to 6 The utility model discloses a mine down red green light control system based on UWB and RFID fusion precision positioning, comprises physical layer part, network layer part and application layer part.

[0023] Further, the physical layer part includes a UWB tag card, an RFID tag card, an antenna, a card reader and an LED display screen.

[0024] Further, the network layer part includes a mine 10G switch, and the mine 10G switch includes a mine 10G switch main machine and a plurality of mine 10G switch extension machines, and the mine 10G switch main machine and the plurality of mine 10G switch extension machines form an industrial Ethernet transmission platform.

[0025] Further, the application layer part includes a monitoring host computer and a monitoring backup machine, and the monitoring host computer and the monitoring backup machine form a central computer server.

[0026] Further, the physical layer part, the network layer part and the application layer part are sequentially connected, the application layer part is arranged outside the mine, and the physical layer is arranged inside the mine.

[0027] Further, the monitoring host computer and the monitoring backup machine are connected with the mine 10G switch main machine, and the mine 10G switch main machine is connected with the plurality of mine 10G switch extension machines.

[0028] Further, each mine 10G switch extension machine is connected with a card reader, and the card reader is connected with an LED display screen and an antenna.

[0029] Further, the antenna is connected with the UWB tag card and the RFID tag card through a wireless carrier signal, the UWB tag card emits a wireless carrier signal at regular intervals, and the RFID tag card and the antenna perform uninterrupted wireless carrier signal transmission.

[0030] Further, a controller is connected between the card reader and the LED display screen, and the controller is connected with the card reader and the LED display screen through RS485.

[0031] Further, the LED display screen, the controller, the card reader and the antenna are arranged at the intersection under the mine.

[0032] Further, the LED display screen displays red light and green light conditions.

[0033] Further, the physical layer part is composed of the UWB tag card, the RFID tag card, the antenna, the card reader and the LED display screen, and the wireless ranging information is transmitted and received, and the position information of the identification card is calculated by the card reader and displayed on the LED display screen.

[0034] Further, the network layer part is composed of the industrial Ethernet transmission platform composed of the mine 10G switch, and finally the wireless ranging information is uploaded to the application layer center.

[0035] Further, the application layer part is composed of the center computer server composed of the monitoring host and the monitoring backup, and the wireless ranging information is received and processed through the network, and the specific position information of the monitoring target is displayed in real time.

[0036] Further, the UWB tag card is an active radio frequency identification card containing an RFID and a uwb positioning chip. The UWB tag card periodically transmits a wireless carrier signal, and after the card reader receives the signal, it returns a data packet containing the signal flight time slot to the tag card. After the tag card receives the return signal of the card reader, it sends an acknowledgement signal again, and the card reader receives the signal for the second time, that is, a signal flight cycle is completed. The ranging is initiated by the card reader, the pulse signal is calculated and returned by the UWB tag card, and the pulse signal is sent by the card reader, the pulse signal is calculated and returned by the UWB tag card, and the distance measurement value is calculated by the card reader according to the two ranging.

[0037] The RFID tag card detects the distance based on the propagation and reflection of electromagnetic waves. When the card reader transmits a radio wave of a specific frequency, the waves will encounter nearby RFID tags and partially reflect back to the card reader. The card reader can calculate the distance between the RFID tag card by measuring the time delay or the change of signal strength of the reflected signal.

[0038] Regarding UWB ranging;

[0039] Through Figure 3-Figure 4 As shown, the card reader has three antennas, each pointing in one of the three directions under the mine. The UWB tag card under the mine initiates a pulse signal at time TA, and the card reader reads the pulse signal at time TB. The card reader also reads the same pulse signal at times TC and TD. By subtracting TA from TB, TC and TD, T1, T2 and T3 are obtained, and by judging the time length, the specific direction of the vehicle is obtained. The time length formula is as follows:

[0040] T1 = TB-TA;

[0041] T2 = TC-TA;

[0042] T3 = TD-TA;

[0043] Based on the above results, assuming T3>T2>T1, it can be concluded that the antenna receiving the pulse signal at time TB is facing the direction of the vehicle or person. The card reader sends a pulse signal at time TE. When the signal is received by the tag card at time TF, the time difference between the pulse signal of the tag card and the arrival of the card reader is calculated based on TA, TF, TB, and TE. The formula is:

[0044]

[0045] T is the one-way flight time of the pulse signal in the air;

[0046] Assuming that the speed of the pulse signal flying in the air is the speed of light C, the distance between the tag card and the card reader is recorded as D1, and the calculation formula of the distance D1 is: D1 = T*C.

[0047] About RFID tag distance measurement:

[0048] As shown in the schematic diagram, the card reader has three antennas, each facing three directions in the mine. The RFID tag in the mine moves within the mine tunnel and can only be read by the antenna in the mine tunnel to which it belongs. The corresponding distance Df is calculated based on the signal received by the card reader. The calculation formula is as follows:

[0049]

[0050] Where Gt is the reader antenna gain, Pt is the reader transmit power, RCS is the radar cross section difference of the electronic tag, γ is a fixed value for the test, and Pth is the reader sensitivity.

[0051] The principle of this utility model is as follows: The LED display at an intersection is red and green, forming a traffic light. The traffic light displays green when no vehicles are passing. When multiple vehicles or people approach the intersection, the light switches to green for that vehicle based on the distance and time it took them to reach the intersection. All other lights at the intersection switch to red. After the vehicle or person passes, the next target vehicle is determined based on the distance and time it took other vehicles to reach the intersection, and the traffic light at that direction switches to green. If the card reader detects the highest-priority vehicle or person, the traffic light in that direction switches to green, while the lights in other directions switch to red, ensuring that the vehicle or person has priority to pass through and ensuring right-of-way. If multiple vehicles or people arrive at the intersection simultaneously, the vehicle with the highest priority is prioritized, and the vehicle with the highest priority is given priority until all vehicles and people have passed.

[0052] Embodiment 1 of the present utility model:

[0053] Regarding the priority and safety of the above vehicles and pedestrians: Figure 5-Figure 6 As shown;

[0054] Priority processing: Vehicle and personnel identification and processing. Vehicles and personnel all wear tag cards (UWB tag cards and RFID tag cards), but the tag cards have different priorities. When different people and vehicles wearing tag cards pass through the intersection, the card reader identifies different tag cards and determines the current position of people and vehicles, adjusts the switching of traffic lights, and allows those with higher priorities to pass through the intersection first within a relative time. For example, when the intersection reader detects that vehicle A, vehicle C and person B are about to pass through the intersection at the same time, the reader will read the priority relationship in the tag cards of vehicle A, vehicle C and person B. Vehicle A is read as having the highest priority, and the light is switched to green in the direction of the intersection first, ensuring that vehicle A has priority right of passage at the intersection. When vehicle A is detected leaving the intersection, the reader reads that person B and vehicle C need to pass through the intersection, and determines that person B has a higher priority, so the red light at the intersection is switched to green, ensuring that person B passes through with priority. After person B passes the intersection, the red light facing vehicle C is switched to green, and the lights in other directions are all red, allowing vehicle C to pass.

[0055] Embodiment 2 of the present utility model:

[0056] Safety: Ensuring the safety of vehicles and people passing through, such as constantly tracking intersection conditions. Our tags utilize a fusion of UWB and RFID for positioning. When people and vehicles are far from the intersection, the reader, if able to read the tag's UWB signal, can determine their coordinates and distance based on the UWB signal. When a vehicle or person approaches the intersection within 10-15 meters, the reader also picks up the tag's RFID signal and, by processing the RFID signal, determines their direction and distance. Combined with the UWB signal from the tag, the reader can determine the vehicle's distance, direction, and priority level. This improves vehicle and person recognition, enables real-time monitoring and tracking, and enhances system reliability and responsiveness.

[0057] When the present invention is implemented, UWB tag cards and RFID tag cards are both set on vehicles or people to achieve accurate positioning and distance calculation.

[0058] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited to them. Any changes or substitutions that do not require creative work should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims

1. A traffic light control system for underground mines based on UWB and RFID fusion and precise positioning, characterized by: It consists of the physical layer, network layer and application layer; The physical layer includes a UWB tag, an RFID tag, an antenna, a card reader and an LED display; The network layer part includes a 10 Gigabit switch for mining, which includes a 10 Gigabit switch main unit and multiple 10 Gigabit switch extensions for mining. The 10 Gigabit switch main unit and multiple 10 Gigabit switch extensions for mining form an industrial Ethernet transmission platform. The application layer includes a monitoring host and a monitoring standby machine, which form a central computer server; The physical layer part, the network layer part and the application layer part are connected in sequence, the application layer part is arranged outside the mine, and the physical layer part is arranged inside the mine.

2. The mine traffic light control system based on UWB and RFID fusion precise positioning according to claim 1 is characterized by: The monitoring host and the monitoring standby machine are connected to the mining 10 Gigabit switch host; the mining 10 Gigabit switch host is connected to multiple mining 10 Gigabit switch extensions.

3. The mine traffic light control system based on UWB and RFID fusion precise positioning according to claim 1 is characterized by: Each of the mining 10G switch extensions is connected to a card reader, which is connected to an LED display screen and an antenna.

4. The mine traffic light control system based on UWB and RFID fusion precise positioning according to claim 1 is characterized by: The antenna is connected to the UWB tag and the RFID tag via a wireless carrier signal, and the UWB tag transmits the wireless carrier signal at regular intervals; the RFID tag and the antenna perform uninterrupted wireless carrier signal transmission.

5. The mine traffic light control system based on UWB and RFID fusion precise positioning according to claim 1 is characterized by: A controller is connected between the card reader and the LED display screen, and the controller, the card reader and the LED display screen are connected via RS485.

6. The mine traffic light control system based on UWB and RFID fusion precise positioning according to claim 1 is characterized by: The LED display screen, controller, card reader and antenna are set up at the intersection under the mine.

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