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Time synchronization and multiple access fusion method between underwater gliders

An underwater glider, time synchronization technology, applied in the directions of synchronization devices, electrical components, transmission systems, etc., can solve the waste of time resources and energy resources, increase the number of control frame exchanges, etc., to reduce the number of transmissions, improve synchronization accuracy and Efficiency, the effect of reducing frame collisions and network overhead

Inactive Publication Date: 2020-02-11
TIANJIN UNIV
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Problems solved by technology

The two exchange processes are carried out independently, which greatly increases the number of control frame exchanges, resulting in waste of time resources and energy resources

Method used

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  • Time synchronization and multiple access fusion method between underwater gliders
  • Time synchronization and multiple access fusion method between underwater gliders
  • Time synchronization and multiple access fusion method between underwater gliders

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] like figure 1 As shown, the network includes four glider units (GT-A, GT-B, GT-C and GT-D) working together, each glider unit contains 3 gliders, and sails in a certain formation. The gliding crew performs time synchronization within the group every time interval to ensure the time synchronization of the glider in the group. The specific interval time is determined according to different application scenarios, according to the time deviation threshold between gliders and the accumulated time accuracy within a day. On this basis, the steps of the time synchronization and multiple access process between the four gliding units are as follows:

[0030] 1) In the time synchronization process between groups, each gliding group is regarded as a whole. For example, when both GT-A and GT-B on the same link want to transmit data to GT-C at the same ti...

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Abstract

The invention relates to a time synchronization and multiple access fusion method for underwater gliders. Each glider group is regarded as a whole; beacon-free and local time synchronization between glider groups on the same communication link can be ensured. Meanwhile, time synchronization and multiple access control frames are fused and used for information exchange between gliders; it is set that glider groups GT-A and GT-B on the same link want to transmit data to GT-C at the same time, and when the GT-A and the GT-B start in one time slot, REQUEST frames are sent to the GT-C, wherein theREQUEST frame comprises channel information of the acoustic channel gain and the channel state, a sending moment tg1 and a Sync part set according to whether time synchronization needs to be carried out or not, and if only the multiple access process needs to be completed between the groups, the Sync value is set to be 0; and if the inter-group time synchronization and multiple access processes need to be completed at the same time, Sync is set as 1.

Description

technical field [0001] The invention relates to the field of underwater wireless sensor networks, in particular to a time synchronization and multi-access fusion method for underwater networks where multiple underwater gliders work together. Background technique [0002] In underwater sensor networks, due to the limited energy and movement range of traditional sensor nodes, underwater gliders are widely used in long-term and large-scale oceans due to their long battery life and the ability to dive thousands of meters. Environmental monitoring. However, the monitoring area of ​​a single glider is limited, so the underwater sensor network often uses multiple glider to sail in formation according to a certain plan, and work together to complete the monitoring task. However, the network of underwater gliding units is affected by the complex water environment, and there are often many key problems. For example, gliders working underwater can periodically float to the surface an...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/18H04B13/02
CPCH04B13/02H04W56/001H04W84/18
Inventor 金志刚丁盟格
Owner TIANJIN UNIV
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