Hello Sumit:
The gr-doa OOT was written to use an X300/X310 with two TwinRX daughterboards, providing four receive channels. It will not work out-of-the-box on any other USRP, although it could possibly be modified for use with different daughterboards (such as SBX or UBX), or with a B-series radio. However, the B200/B210 are not well-suited for this OOT, as they cannot provide four phase-coherent channels.
We do not have any specifications on the angular resolution capabilities, but empirically it can track to within a degree or two, under favorable signal conditions.
--​Neel Pandeya