Elaborate the three segments of GNSS with the help of suitable diagrams, wherever required.

The Global Navigation Satellite System (GNSS) is a vital system that provides global positioning and timing information to users worldwide, including in remote areas. It consists of three main segments: the space segment, the control segment, and the user segment. Each of these components plays an essential role in ensuring the system’s accuracy, reliability, and global reach. Let us explore each of these segments in detail.

1. Space Segment

The space segment refers to the constellation of satellites orbiting the Earth that transmit the signals required for positioning. The primary function of the space segment is to provide the necessary satellite signals, which are used by GNSS receivers on the ground to calculate precise location and time data. The space segment typically consists of several satellites, often distributed across multiple orbital planes to ensure global coverage and reliability.

Key Components of the Space Segment:

• Satellites: GNSS satellites are positioned in medium Earth orbit (MEO) at an altitude of approximately 20,000 kilometers above the Earth's surface. They are designed to orbit the Earth in such a way that at least four satellites are visible from any location on the Earth’s surface at any given time.
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