Exploring GPS and Geodesy Concepts

What are the main components of the GPS system?

• Airplanes, ships, cars

• Mobile phones, laptops, tablets

• Satellites, ground control stations, GPS receivers

• Radios, televisions, satellites

How does GNSS differ from GPS?

• GNSS and GPS are the same system with different names.

• GPS is a type of GNSS that only uses ground-based signals.

• GNSS is only used in Europe, while GPS is global.

• GNSS is a general term for satellite navigation systems, GPS is a specific system by the USA.

What are the common types of GPS errors?

• battery life errors

• user interface errors

• Common types of GPS errors include satellite clock errors, ephemeris errors, atmospheric errors, multipath errors, receiver noise, and GDOP.

• satellite signal strength errors

1 Degree along equatorial line is = ____km

• 50

• 35

• 111

• 121

What is an ellipsoid ?

• A model that predicts weather patterns using GPS data.

• An ellipsoid model is a mathematical representation of the Earth's shape.

• A physical representation of the Earth's surface for geological studies.

• A spherical model used for satellite communication.

If PDOP values is lower, then the accurate of GPS reading is _________

• irrelevant to GPS accuracy.

• Less accurate

• signal speed

• more accurate

What is the function of GPS satellites?

• To monitor weather patterns globally.

• To provide location and time information.

• To provide internet connectivity to devices.

• To facilitate satellite television broadcasting.

How does atmospheric interference affect GPS signals?

• GPS signals are unaffected by atmospheric conditions and remain constant.

• Atmospheric interference improves GPS accuracy by enhancing signal strength.

• Atmospheric interference only affects radio signals, not GPS.

• Atmospheric interference can cause delays and inaccuracies in GPS signals due to the ionosphere and troposphere.

Describe the process of trilateration in GPS.

• Trilateration is the process of determining a position using distances from at least four satellites.

• Trilateration requires a direct line of sight to the satellites.

• Trilateration uses only one satellite to determine a position.

• Trilateration is the process of measuring angles from multiple points.

How do multipath errors occur in GPS measurements?

• Multipath errors occur when GPS satellites are too far from the receiver.

• Multipath errors are caused by the receiver's internal clock being inaccurate.

• Multipath errors occur due to GPS signals reflecting off surfaces before reaching the receiver.

• Multipath errors happen due to interference from other electronic devices.