1、 Overview of UWB Technology
What is UWB
UWB, also known as Ultra Wideband technology, is a carrier free communication technology that uses nanosecond to microsecond level non sinusoidal narrow pulses to transmit data. UWB has many significant characteristics by transmitting extremely low-power signals over a wide spectrum.
2、 Application case of UWB in indoor parking lots
Case 1: Indoor parking positioning and navigation based on UWB ultra bandwidth
In indoor parking positioning and navigation, it mainly involves server components, data communication network equipment, UWB base stations, and mobile devices. The server components include a location server, a data server, a presentation server, and GIS. The location server has the function of locating vehicles and can update their location information in real time. The data communication network equipment consists of routers and switches, used for baseband transmission, frequency band transmission, data exchange, data communication network, and error control of data signals. UWB base stations are connected to data communication network devices through data cables, while mobile devices are connected to UWB base stations through radio. Mobile devices can be mobile phones or other electronic devices with wireless network data connection capabilities and equipped with a-GPS modules. By sending and receiving location information to the server through the mobile device, it is convenient to locate vehicles and receive relevant information from nearby parking lots.
By utilizing big data information analysis and monitoring of parking lot data, real-time specific parking information of the target parking lot can be provided in a targeted manner, as well as predicting changes in parking spaces in the target parking lot in the coming hours. Corresponding suggestions can be given on whether to reserve a parking space, in order to help solve many common problems such as where to park, how to park, and other "information silos" in the parking process. This facilitates users to quickly find parking spots, provide roads to the parking spots, and implement road conditions.
Case 2: UWB based system and method for finding cars in indoor parking lots
The system mainly consists of a vehicle controller, UWB wireless communication base station module, in vehicle UWB wireless communication tag module, indoor parking lot monitoring host, cloud server, car owner user mobile phone, and car search APP. The vehicle controller is connected to the onboard UWB wireless communication tag module, which communicates with the UWB wireless communication base station module. The UWB wireless communication base station includes a WiFi communication module, which is wirelessly connected to the indoor parking lot monitoring host through WiFi. The indoor parking lot monitoring host is connected to the cloud server through Ethernet or 4G network. The car owner's mobile phone is equipped with a UWB wireless communication tag module, which communicates with the UWB wireless communication base station module. The car owner uses the car search app to connect to the cloud server through a 4G network. The car search app is used to indicate the direction of the car owner's movement to the parking position of the vehicle.
The specific car search method is as follows: Firstly, several UWB wireless communication base station modules are arranged in the indoor parking lot. In order to ensure communication quality and positioning accuracy, UWB base stations need to be evenly installed in various zones of the indoor parking lot. According to the size diagram of the indoor parking lot, install the UWB wireless communication base station at the known coordinate points. The vehicle mounted UWB wireless communication tag module, the UWB wireless communication tag module carried by the mobile phone, and multiple UWB wireless communication base stations measure the distance between the vehicle mounted UWB tag and the mobile phone UWB tag and multiple UWB base stations through the UWB bidirectional time-of-flight algorithm, achieving indoor positioning of the car's position and the mobile phone's position. After the UWB base station locates the location of the car and mobile phone, the positioning data is transmitted to the indoor parking lot monitoring host through WiFi wireless network, and the host then sends the data to the cloud server. The cloud server plans the driving route for the car owner based on the known location of the car and mobile phone. The mobile car search app accesses the cloud server through 4G network, receives the planned path from the cloud server, and then implements real-time navigation to guide the car owner to the location of the car.
3、 UWB solution for indoor parking lot
UWB positioning principle
UWB (UltraWideband) technology is mainly used to measure distance in indoor parking lots through UWB bidirectional time-of-flight algorithm for positioning. Specifically, several UWB wireless communication base station modules are arranged in the indoor parking lot. The algorithm is used to measure the distance between the vehicle mounted UWB tag module, the UWB wireless communication tag module carried by the mobile phone, and multiple UWB wireless communication base stations, thereby achieving indoor positioning of the car's position and the mobile phone's position. For example, the independently controllable UWB positioning chip and module launched by Chengdu Jingwei Technology Co., Ltd. utilizes this technology to achieve high-precision positioning in indoor parking lots and other scenarios.
Advantages of the solution
Accurate positioning
UWB technology can achieve centimeter level high-precision positioning in indoor parking lots. For example, Xiaomi's "One Finger Connect" UWB technology can achieve centimeter level indoor positioning. When a phone points at a smart device, it can call out a control card, and even directly project the screen when aimed at a TV. In indoor parking lots, this high-precision positioning can help car owners quickly find their vehicles and parking spaces. Jingwei Technology's UWB positioning chip is compact in size, with a specification of 5mm × 5mm. Its accuracy can reach within 10 centimeters or even 5 centimeters, and it almost achieves zero delay positioning, allowing consumers to accurately locate and navigate in maze like underground parking lots.
Convenient car search
Real time navigation is achieved through a mobile car search app, guiding car owners to the location of their vehicles and solving the problem of difficulty in finding a car. The car owner's mobile phone is equipped with a UWB wireless communication tag module, which communicates with the UWB wireless communication base station module. The car owner uses the car search app to connect to the cloud server through a 4G network, receive the planned path from the cloud server, and then achieve real-time navigation to guide the car owner to the location of the car. Just like outdoor GPS navigation, it correctly guides car owners to the vehicle's location. Both large and small parking lots can be accurately located, silently searching for cars, and providing a better experience.
No additional hardware investment required
Compared with other car search systems, UWB solutions do not require additional hardware investment or manual maintenance, and have better costs and user experience. At present, the most powerful technology for indoor positioning is UWB positioning technology, which has the characteristics of small size, low power consumption, strong penetration, difficult detection, and high positioning accuracy. The use of indoor positioning and navigation technology can easily achieve reverse car search. Apps that apply indoor positioning and navigation technology, such as parking nearby, can automatically record the user's parking space without any user operation, and automatically mark the best route on the map when the user needs to find a car, making it intuitive and convenient to use. Except for indoor positioning and navigation technology solutions, there is no need for additional hardware investment or manual maintenance, and the cost and user experience are better than other solutions.
The future development prospects of UWB technology in indoor parking lots are broad. With the continuous advancement of technology and the expansion of application scenarios, UWB technology will be used for parking lot management.
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