RADIO ALT

What would be the consequence of a radio altimeter failure?

• ALoss of pressure altitude data
• BLoss of density altitude data
• CLoss of height data

How does a radio altimeter function?

• AMeasures the Doppler shift of a CW transmission
• BMeasures the Doppler shift of a pulse transmission
• CMeasures the time from transmission to the reception of a CW frequency. Doppler shift - There has to be relative motion. Hence there is no Doppler shift in Radio Altimeter.

How does a radio altimeter provide height measurements?

• AMeasuring the Doppler frequency shift in transmitted frequency
• BMeasuring time diff. of a CW transmitted at fixed frequency
• CMeasuring time diff. of a CW transmitted at changing frequency