A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation
Abstract
:1. Introduction
- A cooperative work model in SCNs with emergency EO missions is proposed to give an application case when facing emergency situations. The large scale, complex and dynamic SCNs is decoupled into three kinds of satellites through different working modes, which make the topology control of SCNs easier.
- A novel link cost metric of reliability is proposed to give the selection criterion for choosing the most reliable data routing paths. Through the laws of satellites relative motion, the periodicity and predictability of satellites’ relative position in SCNs are involved in the link cost metric to enhance each chosen ISLs’ reliability.
- A topology control strategy with reliability assurance is proposed to solve the problem of topology management in the dynamic and unstable SCNs. Through some numeric simulations, the proposed reliable strategy has been tested in term of effectiveness of improving data transmission performance and extending average topology lifetime.
2. Network Description
2.1. Satellite Cluster Network
2.2. EO Missions on Satellite Cluster Network
3. Link Cost Metric With Reliability Assurance
3.1. Satellite Mobility
3.2. Reliability Model for Network With EO Missions
3.3. Link’s Stability Model
4. Reliability Assurance Topology Control Strategy
Algorithm 1 Reliability-Assured Topology (RAT) | |
Input: s, g, r and | |
Output: | |
1: | % Sub-step (1,2) |
2: | , , , |
3: | for to n do |
4: | for to m do |
5: | in |
6: | end for |
7: | |
8: | Sort into non-decreasing order by the path cost with |
9: | Let be the sets of DRS on the paths , respectively |
10: | for to m do |
11: | if then |
12: | in |
13: | if then |
14: | |
15: | end if |
16: | else |
17: | |
18: | end if |
19: | end for |
20: | |
21: | end for |
22: | |
23: | %Sub-step (3) |
24: | if exists isolated satellite then |
25: | for any isolated satellite do |
26: | Connect the isolated satellite to the nearest and connected satellite and get |
27: | end for |
28: | end if |
29: | return |
5. Example and Discussion
- (1)
- Figure 7a shows the network topology after applying RAT algorithm Step 1.1–1.3, where the solid links (blue) denote the essential inter-satellite links (EISLs) and the dashed links (green) are the redundant inter-satellite links (RISLs). It is the key topology for Sat1 sending data to Sat15 and 16.
- (2)
- (3)
- Figure 7c is the final topology after applying the RAT algorithm, where the dot-dash links (red) are the additional inter-satellite links (AISLs).
- (4)
- Figure 7d shows the origin of the physical topology without topology control. All nodes communicate with the maximal transmission range.
- (5)
- Figure 7e,f represent the network topologies after using the and MST algorithms.
6. Conclusions and Future Work
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Parameters | Values |
---|---|
ISLs bandwidth | 10 Mb/s |
ISLs queue type | FIFO |
ISLs queue length | 100 Packets |
Simulation duration | 5000 s |
Size of packet | 512 Bytes |
Terminal bitrate | 8 Mbps |
Maximum communication range | 12 km |
Orbit Elements | Values |
---|---|
Semi-major Axis | 6778.14 km |
Eccentricity | 0 |
Inclination | 97.0346 deg |
Argument of Perigee | 0 deg |
RAAN | 279.066 deg |
True Anomaly | 0 deg |
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Chen, Q.; Zhang, J.; Hu, Z. A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation. Sensors 2017, 17, 445. https://doi.org/10.3390/s17030445
Chen Q, Zhang J, Hu Z. A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation. Sensors. 2017; 17(3):445. https://doi.org/10.3390/s17030445
Chicago/Turabian StyleChen, Qing, Jinxiu Zhang, and Ze Hu. 2017. "A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation" Sensors 17, no. 3: 445. https://doi.org/10.3390/s17030445
APA StyleChen, Q., Zhang, J., & Hu, Z. (2017). A Topology Control Strategy with Reliability Assurance for Satellite Cluster Networks in Earth Observation. Sensors, 17(3), 445. https://doi.org/10.3390/s17030445