Download An Introduction to Mission Design for Geostationary by J.J. Pocha PDF

Repair Maintenance

By J.J. Pocha

ISBN-10: 9401082154

ISBN-13: 9789401082150

` The e-book is a good written and is acceptable for a huge diversity of readers from scholars to managers drawn to studying concerning the venture layout challenge and research recommendations for the geo-synchronous orbit. '
Canadian Aeronautics and house magazine, March 1988

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Additional resources for An Introduction to Mission Design for Geostationary Satellites

Example text

If, therefore, the Earth lies close to the Sun, as seen by the sensor, it will be unable to return Earth aspect angle information. The blinding effect persists for a short time before the sensor recovers its sensitivity; and as the satellite is spinning, this time lag translates to an angular distance. The angular separation between the Earth and the Sun as seen by the sensor is, therefore, required to be greater than a specified amount. This imposes a further constaint upon the Sun position and must be accounted for in the launch window analysis.

In practice, however, this is not always possible, and cardioid patterns are common. More complex patterns with narrow but deep nulls have also been used. The assessment of ground station coverage must, in these cases, take account of the antenna pattern. 10 Coverage Analysis The analysis of ground station coverage is fundamental to mission design, as it determines the mission sequence. The analysis is carried out by propagating the transfer orbit by small time or angle increments, and evaluating at each step whether coverage from the stations of the network is possible.

Half the period of the transfer orbit (about 5~ hours) is, therefore, available to identify the need for such a manoeuvre, plan the manoeuvre, achieve the correct spacecraft attitude to perform the manoeuvre, and then to command its execution. This places severe demands upon the ability of the ground network. Coverage of most of the ascent to apogee is essential. The apogee raising manoeuvre is a pre-planned part of the manoeuvre sequence, and is employed to augment the capability of the launch vehicle.

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