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Questions and Answers
What is the role of ground stations in GNSS?
What is the role of ground stations in GNSS?
- To receive signals from satellites and provide correction data (correct)
- To control the orbit of the satellites
- To directly communicate with GNSS receivers
- To assist in transmitting signals to satellites
How do satellite-based navigation systems locate the user?
How do satellite-based navigation systems locate the user?
- Triangulation through calculations involving information from multiple satellites (correct)
- Interpolation of ground station data
- Direct transmission of user coordinates from the satellites
- Time-based estimation using a single satellite
What does GNSS stand for?
What does GNSS stand for?
- Galileo Navigation Satellite System
- Global Navigation Satellite System (correct)
- Global Positioning Satellite System
- Global Network Satellite System
Which of the following satellite navigation systems is NOT part of GNSS?
Which of the following satellite navigation systems is NOT part of GNSS?
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What does the GNSS receiver use the transmitted data to determine?
What does the GNSS receiver use the transmitted data to determine?
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Study Notes
GNSS Fundamentals
- GNSS stands for Global Navigation Satellite System.
GNSS Functionality
- Satellite-based navigation systems locate the user by trilateration, which involves measuring the time delay between when a signal is sent and when it is received.
- The user's receiver uses the time delay and the speed of light to calculate the distance from the receiver to the satellite, which is called a "range measurement".
- With range measurements from at least four satellites, the receiver can calculate its exact location, velocity, and time.
GNSS Components
- Ground stations play a crucial role in GNSS, as they monitor the health and status of the satellites, upload data, and perform various other functions.
GNSS Receiver Functionality
- The GNSS receiver uses the transmitted data to determine the location, velocity, and time of the user.
Non-GNSS Systems
- The Chinese BeiDou Navigation Satellite System (BDS) is a separate satellite navigation system, not part of GNSS.
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