Relay communications strategies for Mars exploration through 2020

Edwards, C. D.; Arnold, Bradford W.; Depaula, Ramon P.; Kazz, Greg J.; Lee, C.; Noreen, Gary K.

doi:10.1016/j.actaastro.2006.02.038

Cited by 20 publications

(12 citation statements)

References 5 publications

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“…Space DTNs for Mars exploration have been studied in [12], [59]. It is well-known that relay communication via Mars-orbiting satellites (spacecrafts) offers significant advantages relative to conventional direct-to-Earth communications.…”

Section: Simulations On a Space Dtn For Mars Explorationmentioning

confidence: 99%

“…9c. We directly use the parameters from [12], [56], [59]. For example, Odyssey and MRO (v 3 and v 4 ) need 2 hours to complete a total orbit around Mars, while MEX (v 5 ) uses 6 hours.…”

Section: Simulations On a Space Dtn For Mars Explorationmentioning

confidence: 99%

“…We assume that the links between rovers and orbiters (red links in the figure) have reliability of 0:999 and cost of 1; the links between orbiters and Earth stations (blue links in the figure) have reliability of either 0:95 or 0:99 (randomly picked) and cost of 2; the remaining temporal links and links among ground stations (black links) have perfect reliability and zero cost. Once again the reliability settings are from [12], [56], [59].…”

Section: Simulations On a Space Dtn For Mars Explorationmentioning

confidence: 99%

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Reliable Topology Design in Time-Evolving Delay-Tolerant Networks with Unreliable Links

Chen

Huang

et al. 2015

IEEE Trans. on Mobile Comput.

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Delay tolerant networks (DTNs) recently have drawn much attention from researchers due to their wide applications in various challenging environments. Previous DTN research mainly concentrates on information propagation and packet delivery. However, with possible participation of a large number of mobile devices, how to maintain efficient and dynamic topology becomes crucial. In this paper, we study the topology design problem in a predictable DTN where the time-evolving topology is known a priori or can be predicted. We model such a time-evolving network as a weighted directed space-time graph which includes both spacial and temporal information. Links inside the space-time graph are unreliable due to either the dynamic nature of wireless communications or the rough prediction of underlying human/device mobility. The purpose of our reliable topology design problem is to build a sparse structure from the original space-time graph such that (1) for any pair of devices, there is a space-time path connecting them with a reliability higher than the required threshold; (2) the total cost of the structure is minimized. Such an optimization problem is NP-hard, thus we propose several heuristics which can significantly reduce the total cost of the topology while maintain the "reliable" connectivity over time. In this paper, we consider both unicast and broadcast reliability of a topology. Finally, extensive simulations are conducted on random DTNs, a synthetic space DTN, and a real-world DTN tracing data. Results demonstrate the efficiency of the proposed methods.

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Section: Simulations On a Space Dtn For Mars Explorationmentioning

confidence: 99%

“…9c. We directly use the parameters from [12], [56], [59]. For example, Odyssey and MRO (v 3 and v 4 ) need 2 hours to complete a total orbit around Mars, while MEX (v 5 ) uses 6 hours.…”

Section: Simulations On a Space Dtn For Mars Explorationmentioning

confidence: 99%

Section: Simulations On a Space Dtn For Mars Explorationmentioning

confidence: 99%

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Reliable Topology Design in Time-Evolving Delay-Tolerant Networks with Unreliable Links

Chen

Huang

et al. 2015

IEEE Trans. on Mobile Comput.

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“…For example, NASA's Lunar Laser Communication Demonstration (LLCD) exhibited a record-breaking Moon to Earth download rate of 622 Mbps [8]. The Gateway will also have similar capabilities as the Mars orbiters, including Mars Reconnaissance Orbiter, Mars Odyssey, and MAVEN, which provide communications between the Mars rovers and Earth [9]. With the currently planned Near Rectilinear Halo Orbit (NRHO), the Gateway will be in a position to provide more than 60% communication coverage for a large portion of the lunar far side, which is greater than the relay support coverage provided by the current Mars fleet [10].…”

Section: The Gateway As Supporting Infrastructure For Lunar Low Latenmentioning

confidence: 99%

Science on the lunar surface facilitated by low latency telerobotics from a Lunar Orbital Platform - Gateway

et al. 2019

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“…These satellites used CW or JT65 modulation schemes for data downlink because of the low demodulation thresholds of these modes, but the data rates are too low (<10 bps) for payload data, so only transmission of some very basic housekeeping data is possible. UHF frequencies, some of which are allocated to the amateur satellite service, are widely used by deep space missions for inter-probe proximity links, for example the link between China’s Chang’e-3 lander and Yutu rover, and NASA’s Electra proximity payload for Mars explorers 10 .…”

Section: Introductionmentioning

confidence: 99%

Design and flight results of the VHF/UHF communication system of Longjiang lunar microsatellites

Wei

Estévez³

et al. 2020

Nat Commun

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As a part of China’s Chang’e-4 lunar far side mission, two lunar microsatellites for low frequency radio astronomy, amateur radio and education, Longjiang-1 and Longjiang-2, were launched as secondary payloads on 20 May 2018 together with the Queqiao L2 relay satellite. On 25 May 2018, Longjiang-2 successfully inserted itself into a lunar elliptical orbit of 357 km × 13,704 km, and became the smallest spacecraft which entered lunar orbit with its own propulsion system. The satellite carried the first amateur radio communication system operating in lunar orbit, which is a VHF/UHF software defined radio (SDR) designed for operation with small ground stations. This article describes and evaluates the design of the VHF/UHF radio and the waveforms used. Flight results of the VHF/UHF radio are also presented, including operation of the radio, performance analysis of downlink signals and the first lunar orbit UHF very-long-baseline interferometry (VLBI) experiment.

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Relay communications strategies for Mars exploration through 2020

Cited by 20 publications

References 5 publications

Reliable Topology Design in Time-Evolving Delay-Tolerant Networks with Unreliable Links

Reliable Topology Design in Time-Evolving Delay-Tolerant Networks with Unreliable Links

Science on the lunar surface facilitated by low latency telerobotics from a Lunar Orbital Platform - Gateway

Design and flight results of the VHF/UHF communication system of Longjiang lunar microsatellites

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