Indoor positioning method based on reverse positioning principle

Abstract

The invention discloses an indoor positioning method based on the reverse positioning principle. The method comprises the following steps: a one-way transmission signal mode is adopted, a positioningtag periodically transmits a positioning packet containing a timestamp to calibrate a relative arrival time of a received signal of a positioning base station; the positioning tag periodically transmits a synchronization packet to accurately calibrate a clock difference of the positioning base station; the positioning base station packages the received synchronization packet and the positioning packet into a datagram based on a user datagram protocol, and forwards the datagram to a positioning engine through a switch; the positioning engine completes the data analysis of the positioning packetand the synchronization packet, and forms an arrival time difference of the positioning tag to each positioning base station; after an observation value is weighted by using a known position of the positioning base station, a hyperbolic equation is solved by using a weighted least squares method to obtain a spatial location of the positioning tag. By adoption of the indoor positioning method disclosed by the invention, the clock difference of the positioning base station can be accurately measured, the indoor positioning accuracy is improved, the software and hardware costs of the positioningtag can also be reduced, and the scheme is simple and is easy to implement.

Description

technical field [0001] The invention relates to the technical field of positioning and location services based on wireless communication, and proposes an indoor positioning method based on the principle of inverse positioning. In this way, the clock error of the positioning base station is accurately calibrated by using the fixed and known synchronization tag to transmit the synchronization packet, which is conducive to improving the indoor positioning accuracy. Background technique [0002] Indoor positioning refers to the positioning of objects or people in an indoor environment. In recent years, industries such as industrial manufacturing, robotics, nursing homes, prisons, warehouses, shopping malls, and other industries have an increasing demand for indoor positioning. The difficulty is mainly reflected in the contradiction between improving the positioning accuracy and reducing the complexity and cost of the implementation scheme. [0003] A kind of indoor positioning...

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Problems solved by technology

[0006] The disadvantages of the above-mentioned prior art are: 1) This method requires strict clock synchronization between the transmitter and the receiver to ensure that the time of transmission and reception has the same clock reference, but in actual application scenarios, it is difficult to realize the synchronization between the user and the positioning base station. 2) If the clock synchronization conditions are not available, the distance between the user and the base station is generally obtained by measuring the time required for the round trip of the signal through two-way communication. The disadvantage of this is that the two-way communication causes an increase in delay. Make clock synchronization more difficult, and two-way communication makes transmitter and receiver equipment complex and costly

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