I suggest that you understand the comparison of representative positioning technologies in different times and fully understand:
The first generation: existence and identification technology, which can also be called early zero-dimensional positioning.
Mainly use passive RFID technology, such as UHF UHF. The advantages are that the tag (terminal) does not need power supply, the cost is low, and the recycling process is not needed. The disadvantage is that the farthest recognition distance is about 10 m, usually 1~2 m, and it is close to metal and liquid, so the recognition distance needs to be broken again.
The second generation: coarse distance recognition, which can carry sensing information.
Active technologies, including WIFI, BLE, Zigbee, Sub 1G, Lora, etc. The positioning accuracy of the instrument can be achieved by RSSI and three-point positioning algorithm. The tag (terminal) is powered by battery, which can increase various interactive functions, such as key pressing, screen display, temperature and humidity detection, etc.
The third generation: accurate positioning and ranging, mainly represented by UWB.
This paper mainly uses the technical characteristics of ultra-wideband to optimize the signal interference with ultra-short pulse signals. WEWILLS uses the time-of-flight algorithm, and the accuracy can reach 10cm. The disadvantage is that the current cost is not low enough, and it is mainly used in industrial fields, such as energy buildings (electric power, water conservancy, thermal power generation, etc. ), industrial intelligent manufacturing, personnel control of public security and judicial departments, tunnel construction (subway, high-speed tunnel, mine). At present, the technical solutions adopted by UWB manufacturers are consistent, and the biggest difference will be process service and landing experience.
Three-generation positioning