Abstract:

For double-polarization scattering centers extraction with  horizontal irradiating and horizontal receiving  and the vertical irradiating and vertical receiving, the  scattering centers’ parameters were proposed with the  quaternion MUSIC algorithm. This method connects the hh data  with  vv data first  using quaternion, and then constructs the  quaternion signal subspace and noise subspace  thought of MUSIC. Finally, the  peak searching method was used to estimate  the double-polarization scattering centers’ parameters by taking advantage of the orthogonal property of quaternion signal subspace and noise subspace. Compared with the MUSIC algorithm in a complex domain, the quaternion MUSIC was still effective in the estimate of scattering center parameters with a low  signal noise ratio. The effectiveness of this algorithm was illustrated by a simulation experiment. 

Key words: quaternion, subspace, polarization, scattering center, parameters estimation