The Janus beam is for
- working out acceleration
- levelling the aerial
- to compensate for attitude changes
Explanation from PART66Online
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.
I
Indrajith asked · 10 May 2012
Please check this answer.I suppose first answer is correct.
encyclopedia2.thefreedictionary.com/J...
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