Global Position System

Question 1

Full form of GPS

Answer 1

Global Positioning System

Question 2

What is GPS?

Answer 2

space-based satellite navigation, gives position info

Question 3

How many satellites needed to locate?

Answer 3

At least 4 satellites needed for location and altitudes, 3 for location only

Question 4

How does GPS work?

Answer 4

Satellite sends out time of transmission/satellite position. GPS receiver gets signal, compares time on clock, gets distance from the satellites. Triangulates position on earth.

Question 5

Other GPS systems

Answer 5

GLONASS- Russian

Galileo- European

Question 6

Full form of WAAS

Answer 6

Wide Area Augmentation System

Question 7

What does WAAS do?

Answer 7

Improves accuracy of GPS. Uses ground based reference stations, measures small variations in GPS signals, broadcasts correction message to WAAS receivers.

Question 8

Full form of GBAS

Answer 8

Ground Based Augmentation System

Question 9

What does GBAS do?

Answer 9

Receivers placed around airports. sends correction message to aircrafts to improve accuracy. Makes accuracy within 1 meter.