FCC Commercial Element 9 pool, section 28

Subelement C

Satellite Systems:

Section 28

GPS:

28C1

What is the usual arrangement of GPS satellites?

A.
18 satellites in 3 orbital planes, 6 satellites in each plane, 23,400 km altitude and 55 degrees inclination.
Correct Answer
B.
24 satellites in 6 orbital planes, 4 satellites in each plane, 20,200 km altitude and 55 degrees inclination.
C.
30 satellites in 5 orbital planes, 6 satellites in each plane, 20,200 km altitude and 60 degrees inclination.
D.
36 satellites in 6 orbital planes, 6 satellites in each plane, 23,600 km altitude and 60 degrees inclination.

28C1

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28C2

What is the purpose of the Differential GPS system and how does it work?

A.
To measure the difference between L-1 and L-2 signals and transmit the information via the GPS signal.
B.
To correct for time errors in the satellites and transmit this information via the GPS signal.
Correct Answer
C.
To correct for various errors using a fixed receiving station which transmits corrections via radio signals.
D.
To correct for phase errors between L-1 and L-2 signals and transmit the information via radio beacons.

28C2

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28C3

How is the GPS usually interconnected with other bridge equipment?

28C3

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28C4

Which of the following statements is true?

Correct Answer
A.
The L2 carrier of 1227.60 MHz is used to measure the ionospheric delay.
B.
The L1 carrier of 1650.5 MHz is used to measure the ionospheric delay.
C.
The L1 carrier of 1545.22 MHz is used to provide the navigation message.
D.
The L2 carrier of 1575.42 MHz is used to provide the navigation message.

28C4

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28C5

Which of the following best describes the GPS satellite signals transmitted?

A.
The L2 carrier at 1650.5 MHz carries the navigation message and the L1 carrier at 1575.42 MHz is used to measure the ionospheric delay.
B.
The two carriers are combined in a mixer circuit to develop an intermediate signal which is transmitted.
C.
The main carrier of 1650.5 MHz and a sub-carrier of 1575.24 MHz containing the SPS code signals.
Correct Answer
D.
The L1 carrier of 1575.42 MHz carries the navigation message and the SPS code signals and the L2 carrier 1227.60 MHz which is used to measure the ionospheric delay.

28C5

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28C6

What is the minimum number of satellites that must be received to provide the highest accuracy?

28C6

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