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A method of time synchronization in uwb one-way positioning system

A time synchronization, one-way positioning technology, applied in the field of positioning, can solve the problems of strong dependence on time synchronization servers, high cost, complex hardware, etc., and achieve the effect of wide versatility, easy implementation, and reduced power consumption of labels

Active Publication Date: 2020-08-25
WUHAN UNIV
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Problems solved by technology

Therefore, only by changing the two-way multi-communication mode to one-way communication ranging can the unlimited growth of the number of positioning tags be achieved. However, the current one-way communication ranging method uses hardware time synchronization, and the hardware is extremely complicated and the cost is too high. , and is highly dependent on the time synchronization server, so it is difficult to implement

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Embodiment Construction

[0029] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0030] see figure 1 , the method adopted in the embodiment of the present invention is:

[0031] Within the positioning range, in addition to a certain number of anchor points 1 with known locations, reference points 2 with known locations are arranged. The UWB device placed on the reference point has the function of signal transmission, the UWB device placed on the anchor point has the function of receiving and transmitting signals, and the UWB device placed on the positioning tag 3 only needs to receive the signal and does not need to transmit. There is a minimum requirement for the number of anchor points 1. If two-dimensional coordinate positioning is performed, at least three are required, and if three-dimensional coordinate positioning is performed, at least four are required. In order to ensure the coverage of the pos...

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Abstract

The invention provides a method of time synchronization in a UWB one-way positioning system, a plurality of anchor points of which positions are known are arranged within a positioning range, the method is characterized in that a plurality of reference points of which positions are known are arranged within the positioning range, a UWB device placed on the reference point has a signal transmittingfunction, the UWB device placed on the anchor point has a signal receiving function and the signal transmitting function, and the UWB device at a positioning tag only needs to have the signal receiving function; by measurement, an electromagnetic wave propagation time difference between each anchor point and the positioning tag is calculated, and coordinates of the positioning tag are obtained based on the difference of time for every two anchor points to arrive at the positioning tag respectively. In application of the method, capacity of the positioning tag can be expanded infinitely, meanwhile, power consumption of the tag is reduced, and an overall structure is simple and easy to realize.

Description

technical field [0001] The invention belongs to positioning technology, and relates to a positioning method based on UWB and TDOA technology. Background technique [0002] Outdoor positioning technology is very mature, and there are many kinds of GNSS devices on the market that can meet the various needs of different users from meter level to millimeter level. In fact, many industries have put forward higher and higher requirements for indoor positioning technology, such as the Internet of Things industry, industrial plants, tourism industry, commercial places, airports, fire protection, public security, military, parking lots, medical care, robots, unmanned machines, tunnel mines, etc. For indoor positioning, although there are currently many solutions, such as base station positioning, WIFI fingerprint positioning, ultrasonic positioning, Bluetooth positioning, geomagnetic positioning, pseudolite positioning, UWB (Ultra-Wideband, ultra-wideband) positioning, etc., due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04W64/00G01S5/10
CPCG01S5/10H04W56/0075H04W64/006
Inventor 张涛姚宜斌邹进贵
Owner WUHAN UNIV
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