1.

The configuration in which the Doppler radar beams are both forward and backward looking is called as?(a) Janus(b) Dual(c) Redundant(d) Wide beam

Answer» Right option is (a) Janus

To elaborate: Since the three orthogonal components of velocity are of interest, a minimum of three noncoplanar beams are required to measure the three components. Since such a beam configuration has both forward and rearward looking beams it is called Janus configuration, named after the roman god who has the ability to look backward as well as forward.


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