Wireless Time and Phase Alignment for Wideband Beamforming in Distributed Phased Arrays

We present a two node wideband wireless distributed antenna array operating from 3.1-3.3 GHz on software-defined radios (SDRs). To synthesize the total bandwidth of 300 MHz, a 100 MHz bandwidth signal was used over multiple frequency steps, with the carrier frequency re-tuned between each pulse. The nodes were wirelessly synchronized using a high-accuracy two-way time transfer technique which was also used to determine the inter-node range for beamforming. A total beamforming bias $\pm$ standard deviation of $62.46\pm 45.74$ ps and $0.27\pm 2.28^{\circ}$ at the target beamforming angle at a range of 35.5 m was achieved.