Patent ID: 7420875

Claim:
A method of measuring flow fields in a medium, said method comprising the steps of: moving an energy beam pulse generator through the medium along a path at a velocity; generating forward-facing energy beam pulses and aft-facing energy beam pulses; measuring Doppler shift readings for backscattered energy from the forward-facing energy beam pulses and the aft-facing energy beam pulses at range cells along the path; and combining a first Doppler shift reading for each range cell from a forward-facing energy beam pulse and a second Doppler shift reading from an aft-facing energy beam pulse, the second Doppler shift reading being taken at a time delay equal to a distance divided by the velocity, the distance being taken at any one time as that between the forward-facing energy beam pulse and the aft-facing energy beam pulse along a line parallel to the path and passing through the range cell.