In a microwave range measurement system the electromagnetic signal v 1 = A sin 2ft, with f

In a microwave range measurement system the electromagnetic signal v₁ = A sin 2πft, with f = 100 MHz, is transmitted and its echo v₂(t) from the target is recorded. The range is computed from τ, the time delay between the signal and its echo.

(a) Write an expression for v₂(t) and compute its phase angle for time delays τ₁ = 515 ns and τ₂ = 555 ns. 

(b) Can the distance be computed unambiguously from the phase angle in v₂(t)? If not, determine the additional needed information.