The PDF document highlights information with regard to the Synthetic Aperature Radar.
Of interest for the problems in the word document are the equations on page 5 (title: Along-track resolution) and 6 of the PDF document.
The equation for two-way phase shift with regard to range is shown on page 3.
Thanks in advance for any/all assistance.
On page 3:
phi = phi_o + 2pi*v^2*t^2/lembda*Ro + higher order terms
Because, in higher order terms the denominator increases much faster than numerator, therefore the higher order terms are neglected.
phi = phi_o + ...
The solution provides a step-by-step proof for the resolution synthetic aperture radar.