OGRAD 10.02 - Global Navigation Satellite System (GNSS)

Results

Q1. What is the minimum number of satellites required by a GPS in order to obtain a three dimensional fix?

Q2. In a Satellite-Assisted Navigation system (GNSS/GPS) a position line is obtained by:

timing the period that is taken for a satellite's transmission to reach the aircraft's receiver

the aircraft's receiver measuring the phase angle of the signal received from a satellite in a known position

timing the period that is taken for a transmission from the aircraft's transmitter/receiver to reach and return from a satellite in a known position

the aircraft's receiver measuring the time difference between signals received from a minimum number of satellites

timing the period that is taken for a satellite’s transmission to reach the aircraft’s receiver

Q3. In which frequency band do Satellite-Assisted Navigation systems (GNSS/GPS) provide position information that is available to civil aircraft?

EHF

SHF

UHF

VHF

UHF

Q4. What is the minimum number of satellites required for a Satellite-Assisted Navigation System (GNSS/GPS) to carry out two dimensional operation?

Q5. Signal reception is required from a minimum number of satellites that have adequate elevation and suitable geometry in order for a Satellite-Assisted Navigation System (GPS) to carry out independent three dimensional operation without the Receiver Autonomous Integrity Monitoring (RAIM) function. The number of satellites is:

Q6. Which of the following lists are all errors that affect the accuracy and reliability of the Satellite-Assisted Navigation system (GNSS/GPS)?

Satellite to ground time lag; atmospheric propagation; satellite clock

Satellite mutual interference; satellite ephemeris; atmospheric propagation

Satellite clock; satellite ephemeris; atmospheric propagation

Satellite mutual interference; frequency drift; satellite to ground time lag

Satellite clock; satellite ephemeris; atmospheric propagation

Q7. Signal reception is required from a minimum number of satellites that have adequate elevation and suitable geometry in order for a Satellite-Assisted Navigation System (GNSS/GPS) to carry out independent three dimensional operation, Receiver Autonomous Integrity Monitoring (RAIM) and to isolate any faulty satellite and remove it from contributing to the navigation solution. The number of satellites is:

Q8. In a Satellite-Assisted Navigation System (GNSS/GPS), a fix is obtained by:

measuring the time taken for a minimum number of satellites' transmissions, in known positions, to reach the aircraft's receiver

the aircraft's receiver measuring the phase angle of signals received from a number of satellites in known positions

measuring the time taken for an aircraft's transmissions to travel to a number of satellites, in known positions, and return to the aircraft's receiver

measuring the pulse lengths of signals received from a minimum number of satellites received in a specific sequential order

measuring the time taken for a minimum number of satellites’ transmissions, in known positions, to reach the aircraft’s receiver

Q9. The GPS satellites will pass positions on the Earth having latitude as high as

45°

55°

60°

65°

55°

Q10. Of the types of GPS receivers available for civil aviation, which is the most advanced type?

The multiplex receiver

The multiple satellite receiver

The single channel receiver

The continuous tracking receiver

Q11. Current minimum operational standards for the GPS system calls for

3 satellites "visible" at least 7,5° above the horizon

4 satellites "visible" above the horizon

4 satellites "visible" at least 10° above the horizon

5 satellites "visible" at least 7,5° above the horizon

5 satellites “visible” at least 7,5° above the horizon

Q12. In the GPS system Receiver Autonomous Integrity Monitoring (RAIM)

Means that the receiver evaluates the signals from 5 satellites and discards the signals from a satellite exhibiting anomalous pseudo range errors

Means that the positions from 3 independent receivers are matched and blended to one accurate position

Means that the receiver itself selects 3 satellites from the 21 in orbit at any time

Includes the operators final selection of the satellites that the receiver presents as suitable