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Time Synchronization Mechanism of Ultrasonic Stereotaxic Positioning System Based on Wireless Sensor Network

A wireless sensor and stereo positioning technology, applied in the direction of synchronization device, wireless communication, network topology, etc., can solve the problems of node clock asynchronous, achieve the effect of solving time asynchronous, good security performance, and expanding the scope of application

Inactive Publication Date: 2018-05-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a simple and reliable time synchronization mechanism in order to solve the ubiquitous problem of out-of-sync node clocks in the ultrasonic stereotaxic system based on wireless sensor networks

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  • Time Synchronization Mechanism of Ultrasonic Stereotaxic Positioning System Based on Wireless Sensor Network
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  • Time Synchronization Mechanism of Ultrasonic Stereotaxic Positioning System Based on Wireless Sensor Network

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Embodiment Construction

[0030] In order to express the embodiments, significance and advantages of the present invention more clearly, the present invention will be described in more detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used for illustration and description, and are not intended to limit the present invention.

[0031] The actual measured target space range of this system is a three-dimensional space of 4.0m×4.0m×2.0m, and a tripod is used to fix nine reference nodes at the top of the space, such as figure 1 shown. Nine nodes divide the measured space into four positioning units of 2.0m×2.0m×2.0m.

[0032] Take one of the units as an example, figure 2 A block diagram of the ultrasonic stereotaxic system within the unit is shown. The target node 1 uses an electric car as its carrier, which can move freely in the measured space; four reference nodes 2, 3, 4, and 5 are fixedly placed at ...

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Abstract

The invention discloses an ultrasonic stereotaxic positioning time synchronization mechanism based on a wireless sensor network, which belongs to the technical field of wireless stereotaxic positioning. Based on the wireless sensor network technology, the present invention solves the time synchronization problem in the wireless ultrasonic stereo positioning by using the four-way handshake communication between the target node and the reference node, so that the global network nodes maintain the same time reference, and the positioning of the target node is accurate It has high performance and strong real-time performance, and overcomes the problems of complex wiring of the wired ultrasonic stereotaxic system and poor positioning accuracy caused by the asynchronous network node clocks in the wireless mode. The invention has wide application range and strong expandability, and can be used to solve the time synchronization problem in different wireless stereo positioning systems.

Description

【Technical field】 [0001] The invention belongs to the technical field of wireless stereo positioning, in particular to a stereo positioning system based on ultrasonic positioning and a wireless sensor network. 【Background technique】 [0002] Ultrasonic ranging and positioning is a non-contact measurement technology, and it is widely used in ranging and positioning due to its high ranging accuracy, strong directivity, low energy consumption and insensitivity to electromagnetic fields. The wired ultrasonic positioning system can be composed of a target node and several reference nodes. Under the action of the microcomputer instruction signal, the reference node transmits an electrical signal to the target node through a wired medium, and the target node transmits an ultrasonic signal to the reference node at the same time after receiving the electrical signal. Thus, the distance to be measured is calculated according to the time difference between the command signal and the ar...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04W64/00H04W84/18
Inventor 孙桂玲左杰李洲周杨长锐张颖李晓晨
Owner NANKAI UNIV
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