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A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation

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ABSTRACT

This article investigates the dynamic topology control problem of satellite cluster networks (SCNs) in Earth observation (EO) missions by applying a novel metric of stability for inter-satellite links (ISLs). The properties of the periodicity and predictability of satellites’ relative position are involved in the link cost metric which is to give a selection criterion for choosing the most reliable data routing paths. Also, a cooperative work model with reliability is proposed for the situation of emergency EO missions. Based on the link cost metric and the proposed reliability model, a reliability assurance topology control algorithm and its corresponding dynamic topology control (RAT) strategy are established to maximize the stability of data transmission in the SCNs. The SCNs scenario is tested through some numeric simulations of the topology stability of average topology lifetime and average packet loss rate. Simulation results show that the proposed reliable strategy applied in SCNs significantly improves the data transmission performance and prolongs the average topology lifetime.

No MeSH data available.


Illustration of cooperative work in SCNs.
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sensors-17-00445-f003: Illustration of cooperative work in SCNs.

Mentions: According to different payload requirements when observing the Earth, let satellites in SCNs be divided into three categories: Earth observation satellites (EOS), ground-station communication satellites (GSC), and data routing satellites (DRS), i.e., . EOS are the satellites having EO cameras and play the role of taking images of the ground targets; GSC should have the ability of high-speed data transmission and are responsible for sending these data to ground stations via satellite-ground links of high bandwidth; and the rest satellites are categorized as DRS, which undertake the task of image data relaying, to transmit the image data from EOS to GSC. For example, as shown in Figure 3, two EOS work cooperatively to accomplish the target imaging and, at the same time, send these data to the ground stations via several DRS and GSC. In this above cooperative work pattern, it not only greatly extends the functionality of the SCN by working as a team, but also makes possible the transmission of large amounts of image data to the ground, which is usually strongly demanded in some emergency cases [34].


A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation
Illustration of cooperative work in SCNs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5375731&req=5

sensors-17-00445-f003: Illustration of cooperative work in SCNs.
Mentions: According to different payload requirements when observing the Earth, let satellites in SCNs be divided into three categories: Earth observation satellites (EOS), ground-station communication satellites (GSC), and data routing satellites (DRS), i.e., . EOS are the satellites having EO cameras and play the role of taking images of the ground targets; GSC should have the ability of high-speed data transmission and are responsible for sending these data to ground stations via satellite-ground links of high bandwidth; and the rest satellites are categorized as DRS, which undertake the task of image data relaying, to transmit the image data from EOS to GSC. For example, as shown in Figure 3, two EOS work cooperatively to accomplish the target imaging and, at the same time, send these data to the ground stations via several DRS and GSC. In this above cooperative work pattern, it not only greatly extends the functionality of the SCN by working as a team, but also makes possible the transmission of large amounts of image data to the ground, which is usually strongly demanded in some emergency cases [34].

View Article: PubMed Central - PubMed

ABSTRACT

This article investigates the dynamic topology control problem of satellite cluster networks (SCNs) in Earth observation (EO) missions by applying a novel metric of stability for inter-satellite links (ISLs). The properties of the periodicity and predictability of satellites’ relative position are involved in the link cost metric which is to give a selection criterion for choosing the most reliable data routing paths. Also, a cooperative work model with reliability is proposed for the situation of emergency EO missions. Based on the link cost metric and the proposed reliability model, a reliability assurance topology control algorithm and its corresponding dynamic topology control (RAT) strategy are established to maximize the stability of data transmission in the SCNs. The SCNs scenario is tested through some numeric simulations of the topology stability of average topology lifetime and average packet loss rate. Simulation results show that the proposed reliable strategy applied in SCNs significantly improves the data transmission performance and prolongs the average topology lifetime.

No MeSH data available.