EASA NAV(A)basic
The GNSS method that determines position from measured distances to satellites is called _____.
Answer
trilateration
Explanation
### Why this is right
Trilateration combines measured distances to known points to determine a position. In the material, the known points are satellites and the distances are obtained from their signals.
### The concept
A single measured distance restricts the receiver to possible positions at that distance from a satellite. A second distance narrows the possibilities, and another measurement helps identify the aircraft’s position. The GNSS receiver repeats this process and expresses the result as geographic coordinates. This is different from triangulation based on measured angles; the method described here uses distances.
### Terms
- **Global Navigation Satellite System (GNSS)**: a satellite-based navigation system.
- **Trilateration**: position determination using measured distances to known points.
- **Geographic coordinates**: numerical values that identify a location on Earth.
### Watch out
Do not substitute an angle-based method for the distance-based method described here.
### Remember
The “distance” idea in trilateration is the clue to the correct term.
Related Questions
- Arrange the described GNSS position process in order: receive satellite signals; measure distances to satellites; combine the distance measurements by trilateration; determine geographic coordinates and show the aircraft on the device map.(intermediate)
- Select ALL items that the provided material identifies as factors to consider when choosing a route: weather, airspace structure, aircraft performance, terrain and obstacles, applicable regulations, and aircraft paint colour.(intermediate)
- Visual Flight Rules (VFR) navigation relies on visual references, so it depends on visibility adequate for the pilot to identify those references.(basic)
- The navigation method that uses visible landmarks such as rivers, towns, and highways is called _____.(basic)
- The navigation method of estimating an aircraft's current position by advancing a known position using course, speed, and elapsed time is called _____ reckoning.(basic)
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