GNSS Exam 1 questions with
complete solutions graded A+
NAVSTAR - correct answer ✔✔ A set of orbiting satellites used in navigation and positioning
Space segment - correct answer ✔✔ one of the three segments of GPS, consisting of 24
satellites and the signals they broadcast from space
There are on a circular orbit path on 6 different planes. Each plane carries 4 satellites that are
tilted 55 degrees to the equator to allow for better solutions are higher latitudes
Orbit earth twice a day so there are always at least 4 in view
Continuously broadcasts radio signals using L band
Each contains atomic clocks to keep accurate time
Can always see 2- 3 ground stations
Control/Ground Segment - correct answer ✔✔ second of three segments of GPS that consists of
stations all around the world so that each satellite can see at least 3 at a time. These stations
know where the satellites should be located to correct locations and the clocks aboard the
satellites. These can update the satellites ephemeris data which is their location, timing, and
health
There are 12 stations
Each satellite must see 3 at a time Know the predicted orbit path of satellites
Track navigation
Processes data
Compute orbit projections
Correct satellites clocks
Send updated orbit and clock data 3 times a day to satellites
Transmit commands for maintenance
complete solutions graded A+
NAVSTAR - correct answer ✔✔ A set of orbiting satellites used in navigation and positioning
Space segment - correct answer ✔✔ one of the three segments of GPS, consisting of 24
satellites and the signals they broadcast from space
There are on a circular orbit path on 6 different planes. Each plane carries 4 satellites that are
tilted 55 degrees to the equator to allow for better solutions are higher latitudes
Orbit earth twice a day so there are always at least 4 in view
Continuously broadcasts radio signals using L band
Each contains atomic clocks to keep accurate time
Can always see 2- 3 ground stations
Control/Ground Segment - correct answer ✔✔ second of three segments of GPS that consists of
stations all around the world so that each satellite can see at least 3 at a time. These stations
know where the satellites should be located to correct locations and the clocks aboard the
satellites. These can update the satellites ephemeris data which is their location, timing, and
health
There are 12 stations
Each satellite must see 3 at a time Know the predicted orbit path of satellites
Track navigation
Processes data
Compute orbit projections
Correct satellites clocks
Send updated orbit and clock data 3 times a day to satellites
Transmit commands for maintenance
