Subelement P: Satellite— Topic 96: INMARSAT Communications Systems-1
Question 3-96P3
Element 3 (GROL)What are the directional characteristics of the INMARSAT-C SES antenna?
Explanation
INMARSAT-C SES antennas are designed to be omnidirectional, meaning they can transmit and receive signals from all horizontal directions (or a very wide cone). This characteristic is crucial for maritime applications where the ship is constantly moving, pitching, and rolling. An omnidirectional antenna ensures reliable communication with the geostationary INMARSAT satellites without requiring complex, active stabilization systems to track the satellite's position.
Highly directional antennas (A, B, C) would necessitate continuous, precise pointing to maintain a satellite link, which is impractical and expensive for the low-cost, robust INMARSAT-C system. The system's design prioritizes reliability and simplicity over high data rates, making an omnidirectional antenna the ideal choice.
Related Questions
3-96P1 What is the orbital altitude of INMARSAT Satellites?3-96P2 Which of the following describes the INMARSAT Satellite system?3-96P4 When engaging in voice communications via an INMARSAT-B terminal, what techniques are used?3-96P5 Which of the following statements concerning INMARSAT geostationary satellites is true?3-96P6 Which of the following conditions can render INMARSAT -B communications impossible?