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

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.


Related in: MedlinePlus

Illustration of transforming position and velocity in ECI to the relative coordinate system of satellite j.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5375731&req=5

sensors-17-00445-f004: Illustration of transforming position and velocity in ECI to the relative coordinate system of satellite j.

Mentions: First, on the basis of Assumption (4) in Section 2, each satellite in the SCN has a network position matrix and its corresponding velocity matrix in ECI at time t. Then, in order to describe the mobility of satellites in detail, it is necessary to change positions and velocity in ECI to a relative coordinate system and obtain the relative position matrix and relative velocity matrix , as shown in Figure 4, where the relative position and velocity matrix meet the following equation:(3)[Vr,Ur]′=([V[i,3]r,U[i,3]r]′−[V[j,3]r,U[j,3]r]′)Awhere A is the coordinate transformation matrix [35].


A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation
Illustration of transforming position and velocity in ECI to the relative coordinate system of satellite j.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

sensors-17-00445-f004: Illustration of transforming position and velocity in ECI to the relative coordinate system of satellite j.
Mentions: First, on the basis of Assumption (4) in Section 2, each satellite in the SCN has a network position matrix and its corresponding velocity matrix in ECI at time t. Then, in order to describe the mobility of satellites in detail, it is necessary to change positions and velocity in ECI to a relative coordinate system and obtain the relative position matrix and relative velocity matrix , as shown in Figure 4, where the relative position and velocity matrix meet the following equation:(3)[Vr,Ur]′=([V[i,3]r,U[i,3]r]′−[V[j,3]r,U[j,3]r]′)Awhere A is the coordinate transformation matrix [35].

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.


Related in: MedlinePlus