Indoor positioning technology is constantly developing, and the means are also rich and diverse. WiFi, Bluetooth, RFID and UWB are popular. These kinds of technologies need to deploy positioning base stations. WiFi needs to deploy AP, Bluetooth needs to deploy Bluetooth base stations or ibeacon, and RFID needs to deploy RFID readers.
WiFi indoor positioning
1) WiFi Positioning defect
WiFi Positioning requires a lot of work on the location map. WiFi Positioning is to obtain the relative coordinates, that is, the coordinates of the mobile phone relative to the WiFi base station or AP. The map needs to be modified after the WiFi base station or AP changes. Thirdly, the defect of WiFi Positioning is that the quality of WiFi base station or AP is unstable, resulting in the positioning quality can not be effectively guaranteed.
2) WiFi Positioning advantages
The cost is low. The WiFi chip module is about 10 yuan. The price of WiFi base station and AP is less than 100 yuan. Moreover, it has the functions of data transmission and positioning, and can meet the needs of low-cost large-scale expansion. In addition, the mobile terminal can be used, and the cost of terminal deployment is omitted. Therefore, WiFi Positioning is the cheapest of several indoor positioning schemes.
3) WiFi Positioning application scenario
It is mainly oriented to low-precision scenes, such as the positioning of scenic spots, large shopping malls, shopping malls, entertainment venues, WiFi attendance of the company’s employees, WiFi sign in, and Exhibition positioning. Some of them are also used for coal mining positioning after transformation. In general, it is only used in areas where the positioning demand is not strong, the positioning function is auxiliary, and the investment is small.
Bluetooth indoor positioning
1) Bluetooth positioning defect
Compared with WiFi Positioning, Bluetooth positioning requires the deployment of Bluetooth beacons, so it is necessary to build a Bluetooth network. Compared with the cost of network construction, the cost of network maintenance will increase a lot. In terms of positioning accuracy, Bluetooth positioning algorithm has no advantage over WiFi, so the accuracy is related to the density of Bluetooth beacon, with an accuracy of about 1-5 meters.
2) Bluetooth positioning advantages
The significant advantage of Bluetooth location is that the power consumption is relatively low, and the power consumption of Bluetooth is lower than that of WiFi. Bluetooth positioning can also use the Bluetooth function of mobile phones and other devices, eliminating the deployment of some terminals.
3) Bluetooth positioning application scenarios
To a large extent, it is highly overlapped with WiFi Positioning. Bluetooth bracelets are used in many Bluetooth terminals, mainly in shopping malls, hospitals, goods loss prevention, shopping malls, entertainment venues, wechat, etc., which are non rigid requirements.
RFID indoor positioning
1) RFID positioning advantages
The advantage of RFID positioning is that the cost is very low. The cost of RFID tags is divided into units, so they can be deployed on a large scale; RFID provides two schemes: active and passive. The passive scheme has no power supply problem. The active scheme can also achieve very low power consumption and can use button batteries for several years of standby; RFID base station equipment is relatively rich, and there are many high-power equipment and low-power card readers, which are suitable for networking in various occasions.
2) Disadvantages of RFID
It needs to meet the same accuracy requirements. Compared with UWB positioning, the deployment of RFID base stations or readers is relatively complex and has a large number.
3) RFID positioning application scenarios
RFID equipment is relatively stable, so it is widely used in the positioning field. Because the price of RFID positioning terminal and RFID tag is very low, it can be used on a large scale. It has mature applications and good prospects in logistics sorting, prison positioning, battery car positioning, automobile electronic license plate positioning, etc.
UWB indoor positioning
1) UWB advantages
At the same time, it has the dual advantages of real-time positioning and precise positioning. The positioning delay time is far less than that of Bluetooth positioning, WiFi Positioning and other indoor positioning technologies. The accuracy can reach about 10cm, which is the first choice for indoor high-precision positioning. And it has the advantages of high dynamic, high capacity and low power consumption.
2) UWB positioning application scenario
It is mainly for some special industries that have high requirements for real-time process or precise positioning, such as prison positioning, factory positioning, football training positioning, logistics forklift positioning, tunnel positioning, petrochemical positioning, power energy positioning, etc.
