Question
What are Keplerian elements?
Answer Options
- A) Parameters that define the orbit of a satellite
- B) Phase reversing elements in a Yagi antenna
- C) High-emission heater filaments used in magnetron tubes
- D) Encrypting codes used for spread spectrum modulation
Correct Answer: A
Explanation
Accurately tracking a satellite is essential for making contact, as its position changes rapidly. The position is calculated by specialized tracking software, which requires precise inputs describing the satellite’s orbital characteristics. These inputs are derived from classical orbital mechanics first described by Johannes Kepler.
Keplerian elements are a set of mathematical parameters (often provided in a two-line element set, or TLE) that define the orbit of a satellite. These elements describe the satellite’s size, shape, and orientation of its elliptical path, allowing ground stations to calculate its precise position and velocity at any given time, which is necessary for predicting pass times and compensating for Doppler shift.
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