Indoor positioning device and method based on inertial guidance and radio frequency identification

Abstract

The invention discloses an indoor positioning device based on inertial guidance and radio frequency identification. The device comprises a positioning terminal, a radio frequency transmitting module and a server, wherein the positioning terminal comprises a three-dimensional accelerometer, a three-axis gyroscope, a radio frequency signal receiver, a wireless communication module, a microprocessor and a shell, the three-dimensional accelerometer and the three-axis gyroscope are fixed in the shell, the axis Z of the shell is vertical upwards, the communication main line of the three-dimensional accelerometer is connected with the microprocessor, the three-axis gyroscope and a three-dimensional accelerometer coordinate are in coincidence, the communication main line of three-axis gyroscope is connected with the microprocessor, the radio frequency signal receiver and the wireless communication module are respectively fixed on two sides of the inner part of the shell, and the communication main line of the radio frequency signal receiver is communicated with the microprocessor. The invention further discloses an indoor positioning method based on the inertial guidance and radio frequency identification. The indoor positioning technology related in the invention has the advantages of being high in positioning accuracy, not affected by indoor complex structures and electromagnetic interference, low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of mobile positioning, and relates to indoor environment target positioning without GPS signals, in particular to a positioning device and method based on inertial guidance and radio frequency identification. Background technique [0002] With the rapid increase of data services and multimedia services, people's demand for positioning is increasing, especially in complex indoor environments, such as airport halls, exhibition halls, supermarkets, libraries, underground parking lots, mines, disaster sites, etc. The indoor location information of the mobile terminal or its holder, equipment and objects is particularly important. In an open outdoor environment, the Global Positioning System (GPS) provides very accurate positioning information. However, due to the particularity of the indoor environment, GPS signals are difficult to cover indoors. Therefore, it is difficult to transplant the algorithms and system...

AI Technical Summary

Problems solved by technology

Among them, infrared ray travels in a short distance in a straight line and is easily interfered by lights, so the indoor positioning effect is very poor; although the overall positioning accuracy of ultrasonic positioning is high, ultrasonic waves are greatly affected by multipath effects and non-line-of-sight propagation, and require investment A large number of hardware facilities, so the cost is too high; Bluetooth technology is easy to find devices when used for indoor short-distance positioning, and the signal propagation is not affected by the line of sight, but its disadvantage is that it is expensive and in complex indoor space environments The stability is slightly poor, and it is greatly disturbed by noise signals; ultra-wideband indoor positioning technology is a new communication technology that is quite different from traditional communication technologies, and can be applied to indoor static or moving objects and people's positioning and tracking. Navigation, and can provide very accurate indoor positioning accuracy, but the equipment is expensive and cannot be promoted on a large scale; WIFI-based positioning technology can only be used for small-scale indoor positioning, and is easily interfered by other signals, and the accuracy is poor. The energy consumption of the device is also high; although the geomagnetic positioning can accurately locate every point in the indoor space, the geomagnetic information database must first be established, and the geomagnetic information database must be updated in time. Geomagnetism is easily affected by geological changes, weather changes, Influenced by external information such as power grid distribution; inertial guidance technology is not affected by line-of-sight, geomagnetism, and noise signals, so the initial positioning accuracy is very high, but after a period of use, due to the cumulative effect of errors, its accuracy will drop significantly; radio frequency There is a defect in the recognition and positioning that the positioning accuracy is not high in complex indoor environments

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