Goldstein Phase Filtering Operator

Phase filtering is a preprocessing technique that greatly reduces the residues in the later on phase unwrapping step and enhances the phase unwrapping accuracy. The method implemented in this operator is a nonlinear adaptive algorithm proposed by Goldstein and Werner [1] in 1998.

Input and Output

The input to this operator is the output of Interferogram Formation operator.
The output of this operator is a stack of filtered I/Q bands.

Parameters Used

The following processing parameter is required for this operator (see Figure 1):

Adaptive Filter Exponent: A value lies in range (0,1]. The larger the value the stronger the filtering.

Figure 1. Goldstein Phase Filtering operator UI

Reference:

[1] R.M. Goldstein and C.L. Werner, "Radar Interferogram Phase Filtering for Geophysical Applications," Geophysical Research Letters, 25, 4035-4038, 1998