Chapter 1 GNSS

Global Navigation Satellite System can be used in certain devices that fitted with a receiver for providing ............

• Position

• Navigation

• Tracking

• Weather

Global coverage for each system is generally achieved by a satellite constellation of 18–30 satellites at .........................

• Medium Earth Orbit

• Lower Earth Orbit

• High Earth Orbit

• Geosynchronous Orbit

What makes an object will stay in its orbit and do not get off?

• Momentum

• Gravity

• Material

• Centrifugal

How many GPS Satellites are currently in orbit around the earth?

• 18

• 22

• 24

• 12

How close to your actual position can a GPS receiver measure?

• Within 10.0 cm

• Within 1.0 m

• Within 10.0 m

• Within 20.0 m

The three segments of the GPS system are the space segment, the user segment, and the .............. segment.

• control

• interface

• computer

• human

What are the clocks called that are used by GPS satellites to very accurately keep time?

• Millisecond clocks

• Microsecond clocks

• Nanosecond clocks

• Atomic clocks

How many measurements (minimum) must be made to give us an accurate estimation trilateration of our position on the earth?

• 1

• 2

• 3

• 4

The purpose of the ................ segment is to Monitor, Predict, Calibrate and Update transmissions from satellites

• Control

• User

• Space

• Human

These are the ground antenna station for GPS, EXCEPT

• Ascension

• Kwajalein

• Schriever

• Diego Garcia