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

The satellite signal travels directly from satellite to receiver

Answer

The GPS receiver tracks too many satellites simultaneously

Answer

The receiver loses contact with WAAS ground stations

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

The time delay between GPS signal transmission and reception

Answer

The error introduced by atmospheric interference

Answer

The difference between WAAS and standard GPS accuracy

Question 3

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

Accepted Answer

GPS spoofing

Answer

Multipath interference

Answer

Ionospheric scintillation

Answer

Signal jamming

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

Add 10° to the true course

Answer

Multiply the true course by the variation factor

Answer

No adjustment is needed; GPS uses magnetic north

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

Navigating solely by reference to visual landmarks

Answer

Using only GPS for primary navigation without cross-checking

Answer

A redundant navigation method using two GPS receivers

Question 6

Ionospheric disturbances (such as solar flares) primarily affect GPS signals by:

Accepted Answer

Causing signal delays that introduce position errors

Answer

Physically damaging satellite hardware

Answer

Permanently removing satellites from service

Answer

Reducing the number of GPS satellites in view

Question 7

A UAS remote pilot notices the aircraft's GPS-based position display shows a location 50 meters from the actual position. What is the most likely cause?

Accepted Answer

Poor satellite geometry (high PDOP) or signal multipath

Answer

The UAS is flying too high for GPS signal acquisition

Answer

The FAA has deliberately degraded GPS accuracy in the area

Answer

The UAS battery level is affecting GPS receiver performance