Question

Which of the following techniques reduces the diurnal variation but does little effect on the phase behaviour of signal of equal path length over different environments?

(a) Composite Omega

(b) Propagation corrections

(c) PPC

(d) Subtracting the signal phases at two of the frequencies

The question was posed to me in class test.

My question comes from Hyperbolic Radio Systems in section Terrestrial Radio Navigation System of Avionics

Answer 1

Correct answer is (a) Composite Omega

For explanation I would say: The composite Omega technique reduces the diurnal variation but does little to reduce the wide variation in phase behaviour exhibited by paths of equal length over substantially electromagnetic/geophysical environments.