Application of music algorithm for imaging point reflectors near transmitting and receiving array

Subsurface imaging techniques have been discussed with MUSIC algorithm to locate point reflectors. Generally, a radar signal received by a spatial array must be decorrelate as pre-processing for the MUSIC algorithm. Since most of decorrelation techniques are based on a plane wave incidence model, it is difficult to apply the decorrelation technique for the radar targets around the near field of the array. In this report, we introduce a new decorrelation technique with transmitting and receiving array for targets near the array and apply the MUSIC algorithm for estimation of the 2D position of the point targets in crosshole tomographic measurement. Simulation results show that this method has much higher resolution and accuracy than the conventional diffraction stack method. Moreover, we discuss the relationship between the S/N ratio and the geometrical separation.