problem with distance/angle computed using DW1000


I am using DW1000 chip for indoor positioning of my robot based on the tag position. I am using two receiver antennas on the anchor. The problem is when there is no direct line path between the tag and anchor even in the close vicinity, may be because of multipath effect or signal fading, the angle is computed wrong and it varies a lot though the distance does not vary much. How I can I get the information from DW1000 about the obstacle hindrance or if there is not a direct line path so may simply ignore those unreliable data buffers? I have tried quite a number of the solutions based on data statistics but none eradicates this problem completely.

Thank You.
Ibraheem Inam