This document presents information about a GPS tracking system. It introduces GPS, describing its features such as being free, precise, and working in all weather. It outlines the architecture of GPS including its three segments - space, control, and user. It describes the space and control segments in more detail. Finally, it discusses applications of GPS like navigation, surveying, and railways, and lists advantages like easy navigation and working in all weather, as well as disadvantages such as high costs and signals not working indoor.
6. SPACE SEGMENT
• 27 Earth-orbiting Vehicles
• 6 Orbital planes
• Each 20,200 Km above the Earth
• 5-7 satellites visible from any point
on Earth
7. CONTROL SEGMENT
• Monitoring & controlling the satellite system
continuously .
• Determine GPS system time .
• Update navigation message for each satellite .
10. ADVANTAGES
• Easy to navigate
• Works in all weather
• 100% coverage on our planet
• Helps to search places
• Low cost
11. DISADVANTAGES
• System are very costly
• Required professional experience
• Signal doesn't work indoor
• Signals are not accurate due to obstacles to signal
• Privacy concern
The last segment is User segment. It is consist with various kinds of devices that we use.
They receive signal from satellites and calculate the data to get current position and movement. (click)
These are some sample devices of user segment. All of them has a tiny chip called GPS module like this one.
