Projects per year
Abstract
This paper presents an analytical solution for a lowthrust maneuver to reduce the flyover time of a given terrestrial target. The work extends the general solution previously developed by the authors for a 3phase spiral transfer that results in a change in the relative right ascension of the ascending node and argument of latitude of satellites in a constellation, by varying the orbital period and the J2 effect experienced by each satellite. This work improves the accuracy of the existing method by including the periodic effects of J2 in the analytical solution. Using these improved equations, a calculation of the flyover time of a given latitude can be determined, and the passes for which the target longitude is in view identified. Validation against a numerical orbit propagator shows the analytical method to accurately predict the subsatellite point of the satellite to within ±1° of longitude after 15 days. A case study is performed showing that the method can successfully be used to reduce the time of flyover of Los Angeles from 14 days to just 1.97 days, with a change of velocity (ΔV) of 63m/s. The full exploration of the solution space shows the problem to be highly complex, such that an increase in the ΔV used for a maneuver will not necessarily reduce the time of flyover, potentially making optimization using a numerical solution challenging. It also shows that very similar flyover times can be achieved with very different ΔV usage. As such, an overview of the solution space is extremely valuable in allowing an informed tradeoff between the time of flyover and maneuver ΔV.
Original language  English 

Title of host publication  AIAA SPACE 2016 
Place of Publication  Reston, VA. 
DOIs  
Publication status  Published  13 Sep 2016 
Keywords
 low thrust
 flyover times
 satellites
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Projects
 1 Finished

Doctoral Training Partnership (DTA  University of Strathclyde)  McGrath, Ciara
Macdonald, M., Vasile, M. & McGrath, C.
EPSRC (Engineering and Physical Sciences Research Council)
1/10/14 → 19/08/18
Project: Research Studentship  Internally Allocated
Research output
 2 Paper

An analytical lowcost deployment strategy for satellite constellations
McGrath, C., Kerr, E. & Macdonald, M., 9 Nov 2015, p. Article BISRS201545. 10 p.Research output: Contribution to conference › Paper
Open AccessFile 
Design of a reconfigurable satellite constellation
McGrath, C. & Macdonald, M., 12 Oct 2015, p. Paper IAC15.C1.9.4. 9 p.Research output: Contribution to conference › Paper
Open AccessFile