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Vision-based firefly sensing type time synchronization method and device

A time synchronization, firefly technology, applied in the field of vision-based firefly perception time synchronization, can solve problems such as reducing coupling delay, achieve the effect of reducing coupling delay, good practicability and algorithm excellence, and improving synchronization efficiency

Inactive Publication Date: 2017-11-24
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention aims to solve the above problems in the prior art, and proposes a firefly-aware time synchronization method and device based on vision, which has no grouping phenomenon, can be quickly synchronized, and is easy to implement. The coupling delay brought by text communication avoids the situation of wireless communication congestion in the late stage of synchronization by using the message stagger mechanism; at the same time, the double-variable coupling strength ensures that under the premise of fast synchronization without grouping phenomenon, it greatly improves Synchronization efficiency, so this method has better practicability and algorithm excellence in large-scale wireless sensor networks

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  • Vision-based firefly sensing type time synchronization method and device

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Embodiment 1

[0047] Such as figure 1 As shown, the invention provides a firefly-aware time synchronization method based on vision, comprising the following steps:

[0048] S1. Initialize the node, assign a random initial phase value to the current node and set the phase growth rate;

[0049] S2. The phase of the current node increases according to the set growth rate;

[0050] S3, judging whether the current node in the network has received the trigger signal, if so, then enter step S4, otherwise, return to step S2;

[0051] S4. Judging whether the current phase value of the current node is less than the preset intensity threshold, if so, proceed to step S5, otherwise, proceed to step S6;

[0052] S5, the coupling strength is a negative coupling strength, and then enter step S7;

[0053] S6, the coupling strength is a positive coupling strength, and then enter step S7;

[0054] S7. The phase value of the current node is adjusted according to the coupling strength to obtain a new phase ...

Embodiment 2

[0074] This embodiment 2 is a device embodiment, and the above-mentioned embodiment 1 is a method embodiment. This embodiment and the above-mentioned embodiment belong to the same technical concept. For the content not described in detail in this embodiment, please refer to method embodiment 1.

[0075] Such as figure 2 As shown, a firefly-aware time synchronization device based on vision, including:

[0076] The setting unit is used to initialize the node, assign a random initial phase value to the current node and set the phase growth rate;

[0077] The phase growth unit is used to increase the phase of the current node at a set growth rate;

[0078] The first judging unit is used to judge whether the current node in the network receives the trigger signal, if so, enter the second judging unit, otherwise, return to the phase increasing unit;

[0079] The second judging unit is used to judge whether the current phase value of the current node is smaller than the preset int...

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Abstract

The invention discloses a vision-based firefly sensing type time synchronization method and a vision-based firefly sensing type time synchronization device. The vision-based firefly sensing type time synchronization method comprises the steps of: step 1, initializing nodes, assigning a random initial phase value to a current node and setting a phase increasing speed; step 2, increasing phase according to the set increasing speed; step 3, judging whether the current node in a network receives a trigger signal, if so, entering a step 4, otherwise, returning to the step 2; step 4, judging whether a current phase value is less than an intensity threshold value, if so, entering a step 5, otherwise, entering a step 6; step 5, entering a step 7 when coupling strength is negative coupling strength; step 6, entering the step 7 when coupling strength is positive coupling strength; step 7, adjusting the phase value according to the coupling strength so as to obtain a new phase value; step 8, judging whether the phase value is less than 1, if so, returning to the step 2, otherwise, entering a step 9; step 9, and transmitting a trigger signal when the phase value becomes 0. The vision-based firefly sensing type time synchronization method and the vision-based firefly sensing type time synchronization device have good practicability and algorithm superiority under a large-scale wireless sensor network.

Description

technical field [0001] The invention relates to the field of wireless sensor networks, in particular to a firefly-aware time synchronization method and device based on vision. Background technique [0002] Time synchronization is a key mechanism of wireless sensor network (WSN) that needs to work together, and its purpose is to make all or some nodes in the network have the same time reference. The traditional time synchronization method belongs to the centralized synchronization method, for example: NTP protocol. They all rely on the root node to communicate with the secondary nodes to achieve synchronization layer by layer. In large-scale wireless sensor networks, centralized time synchronization methods have the following defects: large accumulation of synchronization errors, poor scalability, and poor invulnerability. Among the recently emerging algorithms, the firefly time synchronization algorithm is a distributed algorithm, which has great advantages in improving th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04J3/06
CPCH04J3/0638H04W56/001
Inventor 雷斌李看郑超学高旭敏王翰
Owner WUHAN UNIV OF SCI & TECH