Category Archives: Radio Navigation

Radio Navigation

The influence of the ionosphere on the accuracy of the satellite navigation system NAVSTAR/GPS is:

A: only significant if the satellites are located at a small elevation angle above the horizon
B: minimised by computing the average of all signals
C: minimised by the receiver using a model of the atmosphere and comparing signals transmitted by the satellites
D: negligible

 

 

 

 

 

 

 

 

Answer: C

MLS installations notified for operation, unless otherwise stated, provide azimuth coverage of:

A: + or – 40(degrees) about the nominal courseline out to a range of 30 NM
B: + or – 20(degrees) about the nominal courseline out to a range of 20 NM
C: + or – 40(degrees) about the nominal courseline out to a range of 20 NM
D: + or – 20(degrees) about the nominal courseline out to a range of 10 NM

 

 

 

 

 

 

 

 

Answer: C

“Night Effect” which causes loss of signal and fading, resulting in bearing errors from NDB transmissions, is due to:

A: interference from other transmissions and is maximum at dusk when east of the NDB
B: skywave distortion of the null position and is maximum at dawn and dusk
C: static activity increasing at night particularly in the lower frequency band
D: the effect of the Aurora Borealis

 

 

 

 

 

 

 

 

Answer: B

Which of the following is correct regarding the range of an NDB?

A: The range is limited to the line of sight.
B: Aircraft height is not limiting for the reception of signals from the NDB.
C: The range of an NDB will most likely increase at day time compared to night time.
D: The transmitter power of the NDB station has no affect on the range.

 

 

 

 

 

 

 

 

Answer: B

Which of the following radar equipments operate by means of the pulse technique?

Which of the following radar equipments operate by means of the pulse technique? 1. Aerodrome Surface Movement Radar 2. Airborne Weather Radar 3. Secondary Surveillance Radar (SSR) 4. Aerodrome Surveillance (approach) Radar
A: 2, 3 and 4 only
B: 1, 2 and 4 only
C: 1, 2, 3 and 4
D: 2 and 4 only

 

 

 

 

 

 

 

 

Answer: C