The Janus beam is for
- working out acceleration
- levelling the aerial
- to compensate for attitude changes
Explanation
A Janus arrangement uses pairs of Doppler beams pointing forward and aft. Because errors introduced by pitch (and attitude) shift the two beams in opposite senses, averaging the fore and aft returns cancels the attitude-induced error, giving an accurate ground-speed/drift measurement despite aircraft attitude changes.
Indrajith asking:
Please check this answer.I suppose first answer is correct.
http://encyclopedia2.thefreedictionary.com/Janus+system
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