Help - Orientation Angle Correction

Orientation Angle Correction Operator

If the norm vector of the ground surface is in the incidence plane, then there is no orientation angle shift induced. However, if the surface norm is not in the incidence plane, then orientation angle shift θ is induced. This operator estimates the orientation angle shift θ using the circular polarization method and removes it from the polarimetric data.

The backscattering from reciprocal media with the rotation of an orientation angle θ is given by

Define three circular polarization components as the followsDefine three circular polarization components as the follows:

Then the circular polarization components for the orientation angle rotated backscattering are given by

It can be seen that

It can be shown that <S_RRS^*_LL> is real, therefore, the orientation angle shift θ can be derived from the phase in the above equation:

Input and Output

The input to this operator can be covariance matrix (C3 or C4) or coherency matrix (T3 or T4) generated by Polarimetric Matrix Generation operator.
The output of this operator is coherency matrix T3.

Parameters Used

No processing parameter is required for this operator.

Reference:

[1] Jong-Sen Lee and Eric Pottier, Polarimetric Radar Imaging: From Basics to Applications, CRC Press, 2009