gr-doa is a demonstration on the phase synchronization capability of Ettus Research's TwinRX daughtercards. TwinRX daughtercards can achieve a high degree of accurate phase synchronization except for constant repeatable relative phase offsets. We provide apps to determine the accuracy of phase synchronization achieved and to estimate DoA which fundamentally requires accurate phase synchronization across the receive streams.
$ git clone https://github.com/EttusResearch/gr-doa
$ cd gr-doa
$ mkdir build
$ cd build
$ cmake ..
$ make
$ make test
$ sudo make install
$ sudo ldconfig
https://github.com/EttusResearch/gr-doa/wiki
gr-doa/build/docs/doxygen/html/index.html
gr-doa/docs/whitepaper/doa_whitepaper.pdf