A backscatter model was developed for measuring wind field with the far-field approximation method. The theoretical computation and computer simulations with one spatial dimension show that this model can realistically describe the physical meaning and process of the three methods in wind measurements including the spaced antenna (SA) method, Doppler beam swing (DBS) method, and spaced interferometry (SI). The computational difficulties of the traditional theoretical model cannot only be smoothed away, but common characteristics and differences of the three methods can be compared deeply. The comparison of the numerical results between the Wuhan medium frequency (MF) radar (30° N, 114° E) observation and the computer simulation of the full correlation analysis (FCA) of the SA method indicates that the two results agree very well and this model has practical application.

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