Which of the following factors does NOT contribute to the drift of a geostationary satellite from its assigned stationary position?
Electronics and Communication Engineering
Satellite Communication
Difficulty: Medium
Choose an option
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APressure of solar radiations
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BGravitational changes due to the Sun and Moon
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COblateness of the Earth
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DWeight of the satellite
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EElectromagnetic interference from other satellites
Answer
Correct Answer: Weight of the satellite
Explanation
Introduction / Context:Geostationary satellites are designed to remain fixed relative to Earth's surface, but perturbations cause drift. Understanding what affects drift is essential for satellite station-keeping and orbital corrections.
Given Data / Assumptions:
- Orbit: geostationary (approx. 36,000 km altitude).
- Drift sources: gravitational anomalies, radiation pressure, Earth's shape.
- Weight of satellite does not affect orbit per se (all bodies fall equally).
Concept / Approach:Satellite motion obeys Newton's laws. Perturbations cause deviation, but satellite mass cancels out in gravitational equations, meaning weight is irrelevant to orbital drift.
Step-by-Step Solution:
Solar radiation exerts continuous small force → drift.Sun and Moon's gravity → cause longitudinal and latitudinal drift.Earth's oblateness (non-spherical shape) → causes drift from equator.Satellite weight → irrelevant, as gravitational acceleration is independent of mass.Verification / Alternative check:
Orbital mechanics confirm perturbations depend on forces, not satellite mass.Why Other Options Are Wrong:
All other listed factors do influence drift significantly.Common Pitfalls:
Mistaking heavier satellites as more resistant to drift; in reality, station-keeping fuel requirement is unrelated to dry weight.Final Answer:
Weight of the satellite