DBSAR is an airborne synthetic aperture radar developed by NASA to estimate biomass. It uses digital beamforming to implement advanced scanning modes not possible with conventional SARs. DBSAR's architecture includes an 8-channel phased array antenna, reconfigurable waveform generator, and real-time processor. Initial flights were conducted in 2008 over forests, and field measurements were collected to correlate radar backscatter to biomass. Ongoing work involves biomass retrieval algorithms using DBSAR and interferometry techniques.