pole-sitter
Mission analysis and systems design of a near-term and far-term pole-sitter mission
... far-term pole-sitter mission. The pole-sitter concept was previously in- troduced as a solution to the poor temporal resolution of polar observations from highly inclined, low Earth orbits and ...
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Design of optimal Earth pole-sitter transfers using low-thrust propulsion
... a pole-sitter platform ...south pole and can as such be seen as an analogue to the GEO for polar observations [3]: a pole-sitter mission would allow for a continuous, full and real time ...
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Design of optimal transfers between North and South Pole-sitter orbits
... Earth pole-sitter mission, where a spacecraft follows the Earth’s polar axis to have a continuous, hemispherical view of one of the Earth’s ...south pole-sitter orbits before the start of the ...
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A near term pole-sitter using hybrid solar sail propulsion
... periodic pole-sitter orbits, that minimize the SEP propellant consumption over a period (one year), while maintaining the pole-sitter condition (4) at each time during the ...
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The pole-sitter mission concept : an overview of recent developments and possible future applications
... the pole-sitter concept (in which a spacecraft is stationary above the pole), spacecraft in artificial equilibrium points in the Sun-Earth system and non-Keplerian polar Molniya ...
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Design of optimal Earth pole-sitter transfers using low thrust propulsion
... the pole-sitter position from LEO, the spacecraft has to increase its orbit radius by a factor ...the pole- sitter transfer is modelled by distinguishing between a launch phase and a transfer ...
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Mission analysis and systems design of a near-term and far-term pole-sitter mission
... far-term pole- sitter mission. The pole-sitter concept was previously introduced as a solution to the poor temporal resolution of polar observations from highly inclined, low Earth orbits and ...
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Novel pole-sitter mission concepts for continuous polar remote sensing
... propulsion pole-sitter can in principle enable a mission that is not feasible using only a solar sail and can extend the mission lifetime with respect to the pure SEP scenario, there are still issues ...
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Design and trade-offs of a pole-sitter mission
... hybrid-propulsion pole-sitter: from the generation of optimal hybrid pole-sitter orbits [10], to system mass budgets [20], and from design of optimal transfers to the pole-sitter ...
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Trajectory and spacecraft design for a pole-sitter mission
... a pole-sitter ...South Pole and, as such, can provide real-time, continuous and hemispherical coverage of the polar ...near-term pole-sitter mission using solar electric propulsion and ...
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Systems design of a hybrid sail pole-sitter
... periodic pole-sitter orbits that minimize the SEP propellant consumption over a period (one year), while maintaining the pole-sitter condition (5) at each instant during the ...
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An earth pole-sitter using hybrid propulsion
... A pole-sitter spacecraft, during the operations phase of its mission, is constantly aligned with the polar axis of the ...the pole-sitter shall follow the Earth’s polar axis, and describe a ...
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Non-Keplerian orbits using hybrid solar sail propulsion for Earth applications
... Clearly, that fantastic journey could not have been possible without the help and support of many people. Firstly, I would like to express my gratitude to my supervisor, Professor Colin McInnes, for giving me the ...
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Quantum corrections for spinning particles in de Sitter
... de Sitter background, due to the vacuum polarisation induced by conformal fields in an effective field theory ...de Sitter background according to their behaviour under transformations on equal-time ...
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Controllable and Uncontrollable Poles and Zeros of nD Systems
... the pole points are the points where P has less than full column ...controllable pole variety andthe uncontrollable pole variety is the pole variety, andalso that the controllable pole ...
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Germ cell autonomous Wunen2 is required for germline development in Drosophila embryos
... between pole cells and somatic cells is crucial for pole cell development and ...of pole cells through the ...in pole cells, and is thought to respond to a signal from the midgut to direct ...
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Perturbative Quantum Gravity on de Sitter Spacetime
... We will analyse perturbative quantum gravity on de Sitter spacetime. We propose a new type of inner product for modes on de Sitter spacetime. This inner product is used to mode decompose perturbations of ...
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4260914 Differential Linear Velocity Transducer Mar79 pdf
... a a first pole piece of magnetic material disposed opposite the north pole of the magnet and spaced apart therefrom; b a second pole piece of magnetic material disposed opposite the sout[r] ...
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Dirac Fermions on an Anti-de Sitter Background
... are calculating using the Feynman propagator. This can be found either by construction, using the time-ordered product of the field operator, or by directly solving the inhomogeneous field equations, using appropriate ...
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D branes in anti de Sitter space
... Despite this success, most of the checks on the string theory side were done in the supergravity approximation due to the difficulty of including Ramond-Ramond (RR) fields in string theory computations. Recently, it has ...
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