Mars solar conjunction prediction modeling

Mars solar conjunction prediction modeling

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Article ID: iaor201530088
Volume: 118
Start Page Number: 246
End Page Number: 250
Publication Date: Jan 2016
Journal: Acta Astronautica
Authors: , , ,
Keywords: simulation, planning
Abstract:

During the Mars solar conjunction, telecommunication and tracking between the spacecraft and the Earth degrades significantly. The radio signal degradation depends on the angular separation between the Sun, Earth and probe (SEP), the signal frequency band and the solar activity. All radiometric tracking data types display increased noise and signatures for smaller SEP angles. Due to scintillation, telemetry frame errors increase significantly when solar elongation becomes small enough. This degradation in telemetry data return starts at solar elongation angles of around 5ˆo at S-band, around 2ˆo at X-band and about 1ˆo at Ka-band. This paper presents a mathematical model for predicting Mars superior solar conjunction for any Mars orbiting spacecraft. The described model is simulated for the Mars Orbiter Mission which experienced Mars solar conjunction during May-July 2015. Such a model may be useful to flight projects and design engineers in the planning of Mars solar conjunction operational scenarios.

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