regarding DDR

Thread Starter

elisettynarendra

Joined May 17, 2010
42
while i was reading about ILS (instrument landing system ) i got a term called DDR (difference in depth of modulation)..how can an antenna transmitting a signal at the same time can produce signals with difference in depth of modulation..

Instrument landing system ground stations provide radio frequency signals that vary linearly in the depth of modulation from the centre or course line at a rate of 0.145% per metre


these are the lines i got from wikipedia
if i am right ..according to what i understood ..the 'depth of modulation ' varies along the beamwidth..
how can we do this with a single antenna transmitting signals at ' DDR '.
 
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