UAG Navigation and GPS Systems 2

Question 1

GPS signal multipath error occurs when:

Accepted Answer

The GPS signal reflects off surfaces before reaching the receiver

Answer

Multipath error occurs when GPS signals reflect off buildings, terrain, or other surfaces before reaching the receiver, causing inaccurate position calculations.

Question 2

What is Position Dilution of Precision (PDOP) in GPS navigation?

Accepted Answer

The reduction in GPS accuracy caused by poor satellite geometry

Answer

PDOP quantifies how the geometric arrangement of visible satellites affects position accuracy; a low PDOP (under 4) means favorable satellite geometry and better accuracy.

Question 3

Which type of GPS interference involves intentionally broadcasting false GPS signals to mislead receivers?

Accepted Answer

GPS spoofing

Answer

GPS spoofing is the deliberate transmission of counterfeit GPS signals to deceive receivers into calculating false position, velocity, or time information.

Question 4

When converting a true course to a magnetic course, a pilot in an area with 10° East magnetic variation should:

Accepted Answer

Subtract 10° from the true course

Answer

With East variation, subtract the variation from the true course to obtain the magnetic course (East is least — subtract; West is best — add).

Question 5

What is dead reckoning as applied to UAS navigation?

Accepted Answer

Estimating position using last known position, speed, heading, and elapsed time

Answer

Dead reckoning involves calculating a current position estimate based on a previously known position, applying known speed, heading, and time elapsed since that position.

UAG - Unmanned Aircraft General Practice Test

UAG - Unmanned Aircraft General Practice Test

UAG Navigation and GPS Systems 2