Chapter 18, Global Navigation Satellite Systems

Question 1

Ephemeris data refers to the satellite’s

Answer 1

Orbital position

Question 2

GPS accuracy and integrity for en route operation can be increased by

Answer 2

Wide area augmentation system (WAAS)

Question 3

The GPS orbital pattern is such that a
minimum of how many satellites should be in
view to a receiver?

Answer 3

Five

Question 4

Selective availability is a feature of GPS that

Answer 4

Intentionally introduces errors

Question 5

In the event of poor satellite coverage, the
system

Answer 5

Automatically selects other navigation sensors and enters into a dead reckoning mode

Question 6

To speed up the satellite acquisition process,
the aircraft receiver can obtain an initial
position fix from the

Answer 6

Inertial reference system

Question 7

The deliberate attempt to disrupt GPS signals
is known as

Answer 7

Spoofing

Question 8

Fault detection is achieved by comparing the position calculations made from how many
satellites?

Answer 8

Six

Question 9

The GPS navigation concept is based upon
calculating satellite

Answer 9

Range

Question 10

Multipath reflections of GPS signals are
caused by

Answer 10

Atmospheric conditions

Question 11

The local area augmentation system
(LAAS) provides integrity messages to
the aircraft via

Answer 11

VHF datalinks

Question 12

How many GPS satellites need to be in view
to be able to define a unique two-dimensional
position on the earth’s surface?

Answer 12

Three

Question 13

Failed satellite(s) can be excluded from the
navigation calculations by comparing the data
from how many satellites?

Answer 13

Six

Question 14

During prolonged periods of poor satellite
reception, the aircraft receiver

Answer 14

Re-enters the acquisition mode

Question 15

GPS satellites occupy orbits at a typical
altitude of

Answer 15

20,000 km

Question 16

GPS transmissions are in the

Answer 16

L-band