A very simplified model of the radar back scattering coefficient of a sea surface is 0 A Bcos 2 where is the angle between the wind direction and the radar look azimuth, and A and B are as follows for K u band scattering at 40 incidence angle, HH polarisation A 0 8v 30, B 3 5 01v v is the wind speed in ms 1 and 0 is given by these expressions in dB A scatterometer observation measures 0 values of 22 9 dB and 21 1 dB looking north and east respectively Find the wind velocity Is there any ambiguity in your answer If so, could it be removed by a third observation

Question: A very simplified model of the radar back scattering coefficient of a sea surface is 0 = A + Bcos 2 where is

A very simplified model of the radar back scattering coefficient of a sea surface is σ⁰ = A + Bcos 2ψ where ψ is the angle between the wind direction and the radar look azimuth, and A and B are as follows for K_u band scattering at 40° incidence angle, HH-polarisation:
A = 0.8v - 30,
B = 3.5 - 01v

v is the wind speed in ms^-1 and σ⁰ is given by these expressions in dB.
A scatterometer observation measures σ⁰ values of –22.9 dB and –21.1 dB looking north and east respectively. Find the wind velocity. Is there any ambiguity in your answer? If so, could it be removed by a third observation?

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