Question

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

I have been asked this question by my school principal while I was bunking the class.

This interesting question is from Doppler Radar topic in division Celestial Navigation, Doppler and Altimeter Radars of Avionics

Answer 1

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.