Positioning technology of indoor positioning, what are the commonly used indoor positioning technolo

Ultrasound technology.

At present, most of the ultrasonic positioning uses the reflective distance measurement method. The system is composed of a main rangefinder and a plurality of electronic tags, the main rangefinder can be placed on the mobile robot body, and each electronic tag is placed in a fixed position in the indoor space. The positioning process is as follows:

First, the signal of the same frequency is sent to each electronic tag by the host computer, and the electronic tag is reflected and transmitted to the main rangefinder after receiving it, so that the distance between each electronic tag and the main rangefinder can be determined, and the positioning coordinates are obtained.

Infrared technology.

Infrared is an electromagnetic wave with a wavelength between radio waves and visible light waves. A typical infrared indoor positioning system activebadges attaches an electronic identifier to the object to be measured, which periodically transmits the unique ID of the object to be measured to a fixed infrared receiver in the room through an infrared transmitter, and the receiver then transmits the data to the database through a wired network. This positioning technology consumes a lot of power and is often blocked by indoor walls or objects, so it is less practical.

Ultra-wideband technology.

Ultra-wideband technology is an emerging wireless technology in recent years, at present, including the United States, Japan, Canada and other countries are studying this technology, and has a good prospect in the field of wireless indoor positioning. UWB technology is a wireless technology with a high transmission rate (up to more than 1000Mbps), low transmission power, strong penetration ability, and is based on extremely narrow pulses, without carriers. It is these advantages that make it more accurate in the field of indoor positioning.

Radio Frequency Identification (RFID) technology.

The RF positioning technology is very convenient to implement, and the system is less disturbed by the environment, and the electronic tag information can be rewritten more flexibly.

Bluetooth positioning: Bluetooth positioning is based on the RSSI (Received Signal Strength Indication) positioning principle. Bluetooth indoor technology is to use a number of Bluetooth LAN access points installed indoors, to maintain the network as a multi-user based basic network connection mode, and to ensure that the Bluetooth LAN access point is always the main device of this micro net, and then obtain the user's location information by measuring the signal strength.

According to the different positioning ends, Bluetooth positioning methods are divided into network-side positioning and terminal-side positioning.

UWB positioning: Ultra-wideband (UWB) positioning technology is a new technology that is very different from traditional communication positioning technology. It uses the anchor nodes and bridge nodes with known positions arranged in advance to communicate with the newly joined blind nodes, and uses the TDoa positioning algorithm to locate by measuring the transmission delay difference between different base stations and mobile terminals.

Comparison between Bluetooth positioning and UWB positioning:

Comparison between Bluetooth positioning and UWB positioning:

First of all, engineers are most concerned about the positioning accuracy problem: the current Bluetooth indoor positioning scheme can achieve meter-level positioning accuracy; UWB positioning has been able to achieve centimeter-level high-precision positioning.

Positioning hardware: As the name suggests, the implementation of the Bluetooth indoor positioning scheme must be based on the Bluetooth indoor positioning products, and the main positioning hardware includes Bluetooth gateways, Bluetooth beacons, bracelets, watches and other Bluetooth tags, as well as smart phones, wireless LANs and back-end data servers. UWB positioning hardware products mainly include positioning engine servers, intelligent terminals, POE switches, UWB base stations, UWB tags, UWB modules, software interfaces, etc.

Application field: Bluetooth positioning is mainly used in indoor positioning with general requirements for the positioning accuracy of people and objects, and is used to obtain the approximate location information of people or objects within a certain spatial range; UWB positioning is mainly used in indoor high-precision positioning, which is used to obtain accurate location information of people or objects within a certain spatial range.

Positioning environment construction: Bluetooth positioning layout is relatively simple, as long as you pay attention to the interval range, UWB Dingshouwu layout is more complicated than Bluetooth positioning, because it involves the installation of UWB base station.

Finally, the key points of indoor positioning solution selection in various fields summarized by skylab indoor positioning engineers will tell you: indoor positioning can be divided into consumer and industrial categories from the direction of use. The consumer category mainly realizes commercial applications such as indoor personnel guidance, consumption push, security monitoring, and smart home.

The industrial category mainly realizes applications such as fire safety, personnel monitoring, equipment guidance, property safety, and smart factories. Some focus on simple indoor positioning, while others are more focused on navigation functions, historical tracks, electronic fences and other functions, so targeted options are needed. Simple indoor positioning and navigation do not have high requirements for positioning accuracy, so you can give priority to the Bluetooth positioning scheme, and give priority to the UWB positioning scheme by focusing on the functions of historical trajectory and electronic fence; We hope to help customers who have indoor positioning solutions.