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Terminal node positioning device and method based on ZigBee

A terminal node and positioning method technology, applied in the direction of electrical components, wireless communication, etc., can solve the problems of large communication loss, unable to make up for real-time changes, and unable to achieve good positioning, and achieve the effect of accurate positioning calculation results

Inactive Publication Date: 2013-06-26
南京芯传汇电子科技有限公司 +1
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Problems solved by technology

However, this approach cannot make up for the real-time changes in environmental factors in actual measurement. Since various real-time changes such as temperature difference between day and night, gas composition, and occlusion may affect the measurement distance, good positioning cannot be achieved.
However, if periodic measurement and statistics are used, it will bring a lot of communication loss, and it may not be able to meet the real-time nature of environmental factors.

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  • Terminal node positioning device and method based on ZigBee

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Embodiment Construction

[0015] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:

[0016] refer to figure 1 As shown, the flow process of the positioning method of the ZigBee-based terminal node positioning device of the present embodiment is specifically as follows:

[0017] Step S1, a certain terminal node sleeps (timing setting).

[0018] In step S2, the channel is monitored during the wake-up period of a certain terminal node, and if a wake-up signal is detected, step S3 is executed.

[0019] Step S3, receiving the RSSI strength value of the wake-up device, and executing step S4 after the receiving is completed.

[0020] Step S4, waiting for timeout, that is, waiting for the end of the wake-up period.

[0021] Step S5, extracting data of two different wake-up devices whose RSSI intensity values ​​are the highest from the wake-up device signals received by a certain terminal node.

[0022] Step S6, according to the formula ...

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Abstract

The invention discloses a terminal node positioning device and method based on ZigBee. The method comprises the following steps of: extracting data of two different wake-up devices with highest RSSI (Received Signal Strength Indicator) strength values from wake-up device signals received by certain terminal node; and calculating the ratio of distances from the certain terminal node to the two different wake-up devices according to an equation shown in a drawing, and calculating the position of the terminal node according to the distance ratio and known positions of the two different wake-up devices. Thus, a novel environment-independent positioning algorithm is adopted by the method, so that the influence on positioning caused by environments is eliminated, and a relatively-accurate positioning calculation result is realized. The method can be widely applied to occasions, such as underground person positioning and tunnel person positioning.

Description

technical field [0001] The invention relates to a wireless sensor network technology, in particular to a ZigBee-based terminal node positioning device and a positioning method thereof. Background technique [0002] One of the most important application examples of wireless sensor networks is to locate terminal nodes (that is, wireless sensors). The methods commonly used academically are: Time of Arrival (TOA, Time Of Arrival), Time Difference of Arrival (TDOA, Time Difference of Arrival), Angle of Arrival (AOA, Angle of Arrival), Received Signal Strength Indication (RSSI, Received Signal Strength Indicator). Due to the necessity of low power consumption of terminal nodes and the difficulty of precise synchronization between terminal nodes in engineering applications, RSSI signal strength is often used to judge the position of terminal nodes in practical applications. [0003] At present, from the point of view of practical application, the solution of wireless sensor posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00
Inventor 赵国安蒋逸薛琳强郁斌
Owner 南京芯传汇电子科技有限公司
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