Nullcline Analysis as an Analytical Tethered Satellite Mission Design Tool

2007 ◽  
Vol 30 (3) ◽  
pp. 741-752 ◽  
Author(s):  
David A. Padgett ◽  
Andre P. Mazzoleni
Keyword(s):  
Design Tool ◽  
Mission Design ◽  
Satellite Mission ◽  
Tethered Satellite

scholarly journals King-Hele orbit theory for periodic orbit and attitude variations

2020 ◽  
Vol 501 (1) ◽  
pp. 1168-1187
Author(s):  
Vishal Ray ◽  
Daniel J Scheeres
Keyword(s):  
Drag Coefficient ◽  
Dynamic Parameter ◽  
Mission Design ◽  
Fourier Series Expansion ◽  
Satellite Orbits ◽  
Physical Interaction ◽  
Satellite Mission ◽  
Simplifying Assumptions ◽  
Time Variations ◽  
Specific Factors

ABSTRACT The analytical theory of satellite orbits in an atmosphere developed by King-Hele remains widely in use for satellite mission design because of its accurate approximation to numerical integration under simplifying assumptions. Over the course of six decades, modifications to the theory have addressed many of its weaknesses. However, in all subsequent modifications of the original theory, the assumption of a constant drag-coefficient has been retained. The drag-coefficient is a dynamic parameter that governs the physical interaction between the atmosphere and the satellite and depends on ambient as well as satellite specific factors. In this work, Fourier series expansion models of the drag-coefficient are incorporated in the original King-Hele theory to capture time-variations of the drag-coefficient in averaging integrals. The modified theory is validated through simulations that demonstrate the attained improvements in approximating numerical results over the original King-Hele formulation.

Representing and Analyzing Sequential Satellite Mission Design Decisions through Anisomorphic Trees and Directed Graphs

2022 ◽  
Author(s):  
Ada-Rhodes Short ◽  
Prachi Dutta ◽  
Ben Gorr ◽  
Luke Bedrosian ◽  
Daniel Selva
Keyword(s):  
Directed Graphs ◽  
Mission Design ◽  
Satellite Mission ◽  
Design Decisions

Mission Design of the Dutch-Chinese FAST Micro-Satellite Mission

2009 ◽  
pp. 187-194 ◽  
Author(s):  
D. Maessen ◽  
J. Guo ◽  
E. Gill ◽  
E. Laan ◽  
S. Moon ◽  
...  
Keyword(s):  
Mission Design ◽  
Satellite Mission

An Information-Exchange Tool for Capturing and Communicating Decisions During Early-Phase Design and Concept Evaluation

2005 ◽  
Author(s):  
Ali Farhang Mehr ◽  
Irem Y. Tumer ◽  
Francesca Barrientos ◽  
David Ullman
Keyword(s):  
Information Exchange ◽  
Failure Modes ◽  
Design Tool ◽  
Mission Design ◽  
Risk And Uncertainty ◽  
Early Stages ◽  
Potential System ◽  
Concept Evaluation ◽  
Potential Failure ◽  
Lack Of Knowledge

Capturing and communicating risk and uncertainty for NASA’s low-volume high-cost exploration missions have become the subject of intensive research in the past few years. As a result, a variety of quantitative and qualitative methodologies were developed, some of which have been adopted and implemented by various NASA centers in the form of risk management tools, procedures, or guidelines. Most of these methodologies, however, aim at the later stages of the design process or during the operational phase of the mission and therefore, are not applicable to the earlier stages of design. In practice, however, uncertainties in the decisions made during the early stages of design introduce a significant amount of risk to the concepts that are being evaluated. In this paper, we aim to capture and quantify uncertainty and risk due to the lack of knowledge as well as those associated with potential system failures. We present an information exchange tool (X-Change) that enables various subsystem designers to capture, quantify, and communicate the uncertainties due to their lack of knowledge as well as those due to failures that might not be readily available or easily-quantifiable. A key piece in this work is to incorporate risk and uncertainty due to the lack of knowledge during the early design phase, and combining it with the potential failure modes. The challenges we face in accomplishing this goal are: 1) lack of a unified ontology defining risk, uncertainty and failure in order to enable their use on common grounds; 2) difficulty in expressing and capturing risk and uncertainty due to the designers’ lack of knowledge at the early stages of design; 3) difficulty in accounting for potential failure modes and their associated risks at the functional design level, before a form or solution has been determined. In order to address these challenges, this paper first attempts to provide a definition for risk and uncertainty. Then, we present the results of an ongoing effort to develop a risk-based design tool for the concurrent mission design environment at NASA. We propose a framework that enables multiple subsystems to capture and communicate the relevant risk and uncertainty in their decisions. The application of the proposed framework is further elaborated using a satellite design example.

scholarly journals Development of the User Requirements for the Canadian WildFireSat Satellite Mission

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5081
Author(s):  
Joshua M. Johnston ◽  
Natasha Jackson ◽  
Colin McFayden ◽  
Linh Ngo Phong ◽  
Brian Lawrence ◽  
...  
Keyword(s):  
Monitoring System ◽  
Wildland Fire ◽  
Earth Observation ◽  
Mission Design ◽  
User Requirements ◽  
User Engagement ◽  
Satellite Mission ◽  
Wildfire Management ◽  
Fire Monitoring ◽  
Space Agency

In 2019 the Canadian Space Agency initiated development of a dedicated wildfire monitoring satellite (WildFireSat) mission. The intent of this mission is to support operational wildfire management, smoke and air quality forecasting, and wildfire carbon emissions reporting. In order to deliver the mission objectives, it was necessary to identify the technical and operational challenges which have prevented broad exploitation of Earth Observation (EO) in Canadian wildfire management and to address these challenges in the mission design. In this study we emphasize the first objective by documenting the results of wildfire management end-user engagement activities which were used to identify the key Fire Management Functionalities (FMFs) required for an Earth Observation wildfire monitoring system. These FMFs are then used to define the User Requirements for the Canadian Wildland Fire Monitoring System (CWFMS) which are refined here for the WildFireSat mission. The User Requirements are divided into Observational, Measurement, and Precision requirements and form the foundation for the design of the WildFireSat mission (currently in Phase-A, summer 2020).

Electrodynamic aspects of the first tethered satellite mission

1993 ◽  
Vol 98 (A8) ◽  
pp. 13761-13778 ◽  
Author(s):  
M. Dobrowolny ◽  
E. Melchioni
Keyword(s):  
Satellite Mission ◽  
Tethered Satellite
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