Simple comparison of various positioning technologies:
Speaking of positioning, everyone is familiar with positioning and navigation represented by GPS. It has become the norm to use a map APP with GPS to navigate outdoors. With the rising demand and the development of technology, indoor navigation is gradually becoming normal.
There are many indoor positioning technologies currently on the market, such as Bluetooth positioning, ultrasonic positioning, LED positioning, mobile phone autonomous inertial sensor positioning, lidar positioning, WiFi positioning, RFID positioning, UWB positioning, etc. Different positioning technologies have their own advantages and disadvantages in terms of accuracy, complexity, cost, and volume.
Bluetooth indoor positioning technology adopts Bluetooth-based triangulation positioning technology. In addition to using the Bluetooth module of the mobile phone, it is also necessary to deploy a Bluetooth base station, which can achieve up to sub-meter positioning accuracy . However, due to the low popularity of Bluetooth base stations, the cost of accurate indoor positioning is relatively high, and it has not yet been popularized. The Bluetooth accuracy can reach 3-5 meters.
The concept of sub-meter level is a resolution below 1 meter. The sub-meter level means that its measurement accuracy can be accurate to decimeters, centimeters or even millimeters.
Ultrasonic positioning is not particularly widely used at present. It is mainly used to install an ultrasonic signal box in the store, which can be detected by the microphone of the mobile phone to achieve positioning. Currently, it is mainly used for store sign-in.
Mobile phone autonomous inertial sensor positioning is a solution for positioning using mobile phone's inertial sensor data. However, due to the uncertainty of the mobile phone's initial attitude and the accuracy of the mobile phone's inertial sensors, the indoor positioning effect is not good.
The LED positioning system realizes the positioning requirements through the LED lamps on the ceiling. The lamp sends out a flashing signal (similar to a telegram code), which is then received and detected by the user's smartphone camera. The user does not need to point the phone in a specific direction to receive the feedback direct light source signal. This solution The positioning accuracy can be controlled at about 1 meter.
Wi-Fi positioning has become very popular due to the popularity of Wi-Fi networks. Wifi positioning accuracy can reach 5-8 meters. Traditional Wi-Fi positioning products are mainly used in professional industries (mines, prisons, hospitals, petroleum and petrochemicals, etc.). Google introduced Wi-Fi indoor positioning and indoor maps to Google Maps, which has covered 10,000 large venues in North America and Europe for more than a year.
RFID positioning is to use the card swiping method to locate the person or device that swipes the card according to the position of the reader . It is mainly used in warehouses, coal mines, cargo tracking, security inspection, ETC, office attendance, etc. Its positioning accuracy is relatively low.
There are also many institutions that have introduced geomagnetic and computer vision positioning products. At present, these two types of products are mostly used for military and scientific exploration. For example, the military underwater navigation commonly uses geomagnetic navigation, and the Mars rover uses computer vision navigation.
I don't know if you have noticed that there are more and more UWB positioning requirements and application scenarios on the market, which can be described as a storm. Let's explore it together.
What is UWB positioning?
The full name of UWB technology is Ultra Wideband, which refers to ultra-wideband technology, which has a bandwidth of more than 500MHz . Simply put, this technology achieves fast data transmission at low power consumption levels through ultra-large bandwidth and low transmit power. Due to the extremely short time width of UWB pulses, high-precision timing can also be used for distance measurement . This bandwidth is greater than ordinary WiFi, Bluetooth and other radio signals. Its anti-interference ability is strong. In addition, the strong anti-jamming capability of UWB technology is more suitable for stable indoor positioning, and is suitable for location management that needs to be accurate to specific personnel and materials. The positioning accuracy of UWB is relatively high, up to 5-10cm. In addition, UWB technology can better resist multipath effects (electromagnetic waves propagate through different paths and reach the receiving end, and they overlap each other according to their respective phases to cause interference) and are not easily affected by obstacles.
Application scenarios of UWB positioning
UWB technology can realize the intelligent positioning management of personnel, fixed assets, tools and other locations . In industrial scenarios, the UWB system can locate personnel and objects in real time, realize personnel trajectory management, material management and control, production process management and other functions, and improve the overall production efficiency and management level of the factory. In the warehousing and logistics scenario, the UWB system can achieve precise positioning and reasonable scheduling of operators, logistics vehicles, and fixed assets. If a person enters the set fence position, the system can give an alarm.
In addition, UWB positioning technology is also in demand in application scenarios such as prisons and nursing homes. For example: After the elderly equipped with a label, if the elderly long time still or fall out of the elderly nursing home range, the system will alarm. The staff can use the system to get the location of the elderly in time for rescue, which can not only ensure the health of the elderly, but also prevent the loss of the elderly. In the prison scene, the UWB system supports all-weather dynamic roll call and tracking, and can track the location of personnel.
Easy Point and Easy UWB positioning solution consists of base station, tag, and positioning engine . Among them, base stations and tags belong to hardware . The base station is installed indoors, and its function is to receive signals. Different installation plans should be made according to the location and other factors. The tag needs to be worn on the person who needs to be positioned, or installed on the fixed asset that needs to be positioned. The tag transmits UWB signals and communicates with the base station so that the tag itself can be located. The positioning engine is on a local server or a cloud server, and running a positioning algorithm can calculate the coordinate position of the tag to be positioned in real time. The user can see the location of these tags (that is, personnel or fixed assets) on the computer or mobile phone.
E-Dian Yidong provides a centimeter-level high-precision indoor and outdoor positioning system based on UWB (Ultra Wide Band) technology. The products cover many application scenarios, and can be used in industries, agriculture, commerce, pension, science and technology, justice, construction, hospitals and other fields .
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