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Earth observation satellite network minimum expenditure routing method based on space-time diagram

An earth observation and satellite network technology, applied in the field of communications, can solve problems such as inability to make decisions on space (satellite) network routing, inability to accurately describe time-varying network topology changes, and lack of time dimension information.

Active Publication Date: 2016-12-07
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, the existing mature network graph models are mainly static graph models, lacking time dimension information
Therefore, the static graph model cannot accurately describe the topology changes of a time-varying network, so it cannot be used for routing decisions in space (satellite) networks

Method used

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  • Earth observation satellite network minimum expenditure routing method based on space-time diagram
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  • Earth observation satellite network minimum expenditure routing method based on space-time diagram

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Embodiment Construction

[0028] specific implementation plan

[0029] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0030] Earth Observation Satellite Networks Contemplated by the Invention The main components and descriptions are as follows:

[0031] (1) Remote sensing satellite SS={ss i |i=1,...,NS}, it serves as the network source node to send the collected remote sensing image data to the ground station;

[0032] (2) Relay satellite RS={rs i |i=1,...,NR}, its role is to maximize (under the constraints of implementation cost) increase the chance of delivering remote sensing image data to the ground station, and play the role of data relay;

[0033] (3) Ground station GS={gs i |i=1,...,NG} is the network destination node, which will collect image data sent by remote sensing satellites. The total number of nodes is N=NS+NR+NG.

[0034] Assume The observation target set of is OT={ot 1 ,...,ot n ...

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Abstract

Aiming at the feature that the spatial network has time-varying topology, for solving the challenge caused by the dynamic nature to the network routing and overcoming the defects of the distributed routing and a static diagram, the invention provides an earth observation satellite network minimum expenditure routing method based on space-time diagram, a specific construction algorithm and the minimum expenditure routing strategy of the time-space diagram are given. The time-space diagram can capture a switching point of a dynamic network and is provided with the time and space dimension information. Therefore, in comparison with other method, the routing method based on the time-space diagram can provide more accurate result and more detailed information. In consideration of the transmission task requirement of the actual spatial network, the invention designs the minimum expenditure routing (MCMP) strategy, and designs the EAMP algorithm based on the earliest arrival time as the comparison object; the experiment verifies the feasibility and advantages of the time-space diagram applied to the spatial network.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a minimum overhead routing method for an earth observation satellite network. Background technique [0002] In the earth observation satellite network, in order to obtain a short revisit cycle and global observation, remote sensing satellites generally operate in low-orbit space. Due to the relatively high-speed movement between satellites, the connection between network nodes has the characteristics of frequent on-off switching and short duration. These characteristics may lead to the lack of an end-to-end transmission path from the source point to the destination node in the satellite network. Therefore, the traditional TCP / IP protocol based on end-to-end connection cannot efficiently complete the transmission of remote sensing image data. To overcome this problem, the earth observation satellite network adopts a Disruption-tolerant Networking Architecture (DTN, Disrup...

Claims

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Application Information

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IPC IPC(8): H04L12/721H04L12/727H04L45/121
CPCH04L45/121H04L45/124H04L45/14
Inventor 杨志华江福荆莹
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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