Down To Earth Systems Engineering: The forgotten ground segment

Chester, Ed

doi:10.2514/6.iac-06-d1.5.04

Cited by 2 publications

(3 citation statements)

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“…The longest accessibility gap is defined as the longest duration between two consecutive accessibility events, in a given period of time. In previous research (Elfving, Stagnaro, Winton, 2003;Rui, Pingyuan and Xiaofei, 2005;Ley, Wittmann, Hallmann, 2009;Chester, 2009;Bonyan Khamseh, 2010;Bonyan Khamseh and Navabi, 2010), the longest accessibility gap is the metric for minimum required level of in-orbit autonomous operation of the satellites. Long accessibility gaps are inherent characteristics of LEO missions.…”

Section: Metric Of Longest Accessibility Gapmentioning

confidence: 99%

“…In recent years, limited financial resources of space activities and the new paradigm of more responsive satellite systems have brought significant attraction toward management of various aspects of ground segment (Peter, 2006;Chester, 2009;Sandau, 2010). One of the most important aspects regarding effectiveness of the ground segment is its site location (Elbert, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Development of access-based metrics for site location of ground segment in LEO missions

Khamseh¹,

Navabi²

2010

JATM

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The classical metrics of ground segment site location do not take account of the pattern of ground segment access to the satellite. In this paper, based on the pattern of access between the ground segment and the satellite, two metrics for site location of ground segments in Low Earth Orbits (LEO) missions were developed. The two developed access-based metrics are total accessibility duration and longest accessibility gap in a given period of time. It is shown that repeatability cycle is the minimum necessary time interval to study the steady behavior of the two proposed metrics. System and subsystem characteristics of the satellite represented by each of the metrics are discussed. Incorporation of the two proposed metrics, along with the classical ones, in the ground segment site location process results in financial saving in satellite development phase and reduces the minimum required level of in-orbit autonomy of the satellite. To show the effectiveness of the proposed metrics, simulation results are included for illustration.

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Section: Metric Of Longest Accessibility Gapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of access-based metrics for site location of ground segment in LEO missions

Khamseh¹,

Navabi²

2010

JATM

View full text Add to dashboard Cite

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“…To take account of this peculiar access pattern, in our previous papers (Bonyan Khamseh and Navabi, 2010a; 2010b) we developed two access-based metrics namely Total Accessibility Duration (TAD) and Longest Accessibility Gap (LAG). Accessibility gaps indicate requirement of autonomous operation (Chester, 2009) and in Bonyan Khamseh and Navabi (2010b) it was discussed that LAG metric is related to minimum requirement of in-orbit autonomy. To obtain LAG metric in a time-independent manner, the concept of repeatability cycle is employed.…”

Section: Introductionmentioning

confidence: 99%

On reduction of longest accessibility gap in LEO sun-synchronous satellite missions

Khamseh

Navabi

2011

JATM

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Accessibility gaps are inherent properties of Low Earth Orbit (LEO) sun-synchronous satellite missions. Long accessibility gaps in satellite missions imply strict in-orbit autonomy requirement, met by expensive solutions. Thus, methods to shorten accessibility gaps in satellite missions are appreciated by space mission designers. For that purpose, in this paper, ground segment site location is employed as a mechanism to reduce the longest accessibility gaps in LEO sun-synchronous missions. For a given repeatability cycle, it is shown that longitude of the ground segment does not affect the access gaps. Simulation results show that increasing the latitude of ground segment reduces the longest accessibility gaps, especially in extreme latitudes near Polar Regions. To avoid polar ground segments due to their practical difficulties, mission architectures with two co-high-latitude ground segments are proposed. Selection of longitude distance between the two cohigh-latitude ground segments is discussed to further reduce the longest accessibility gap in LEO sun-synchronous missions. To show the feasibility of the proposed approach, simulation results are included for illustration.

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Down To Earth Systems Engineering: The forgotten ground segment

Cited by 2 publications

References 0 publications

Development of access-based metrics for site location of ground segment in LEO missions

Development of access-based metrics for site location of ground segment in LEO missions

On reduction of longest accessibility gap in LEO sun-synchronous satellite missions

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