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Moving target positioning method

A technology for moving targets and positioning methods, which is applied in the field of precise positioning of moving targets using unscented Kalman filtering, which can solve problems such as low equipment accuracy, inability to track target positions in real time, and short charging cycles of equipment to achieve accurate estimation.

Active Publication Date: 2018-12-21
NANTONG UNIVERSITY
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AI Technical Summary

Problems solved by technology

Indoor WIFI positioning access threshold is low, but its equipment accuracy is low, and it is not suitable for occasions where the target moves relatively fast, and the target position cannot be tracked in real time
Outdoor GPS positioning technology is widely used, but there are problems such as being easily affected by obstructions, and the charging cycle of equipment is short.

Method used

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Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] In the present invention, the mobile target positioning method, such as figure 1 shown, including the following steps:

[0048] Step 101: data preprocessing, modifying the wireless signal propagation model with a large amount of data in advance, and storing the standard relationship curve of signal strength value-distance in the database;

[0049]Specifically, the signal strength model conforms to the simplified wireless signal gradient model of the distance between the base station and the terminal, as follows:

[0050]

[0051] Among them, p(d) represents the signal strength value received by the terminal when the straight-line distance from the base station is d, that is, the RSSI value; p(d 0 ) means that the distance from the base station is d 0 The signal power received by the terminal; d 0 is the reference distance, n is t...

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Abstract

The invention provides a moving target positioning method which is used for arranging an active moving label on a moving node; a wireless signal sent by the moving label is collected through a readerarranged at a fixed node; information interaction between a server and each reader is carried out, and data preprocessing operation is performed to form a wireless signal gradual change model; specifically, the reader obtains a corresponding signal intensity value from the moving label through a radio frequency identification technology; the signal intensity value is fitted through a non-linear least square method, and an optimized curve after a different-end value is removed is obtained; the curve and the wireless signal gradual change model are subjected to cross-correlation matching to obtain a distance-signal intensity value relation; and the server works out a coordinate position through a weighted centroid positioning method, and then the coordinate position is accurately positionedaccording to non-trace kalman filtering, and a required coordinate point is obtained. By the adoption of the method, the position of the moving target can be stably and accurately estimated.

Description

technical field [0001] The invention relates to a radio frequency identification positioning technology, in particular to a method for accurately locating a moving target by using an unscented Kalman filter. Background technique [0002] Radio frequency identification positioning technology has important applications in logistics management, library book management and other scenarios. With the development of active radio frequency identification technology, the identification distance has increased, and it is currently used in the positioning of low- and medium-speed moving targets such as electric bicycles and pedestrians. Considering the characteristics of mobile targets such as weak ability to carry equipment, flexible activity distance, and faster speed than traditional application scenarios, positioning technology is required to have high equipment convenience and low equipment cost. [0003] At present, traditional mobile target positioning methods mainly include ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/06H04W4/40H04W64/00
CPCH04W4/40H04W64/00G01S11/06
Inventor 施佺夷立华施佳佳孙玲许致火
Owner NANTONG UNIVERSITY
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