%0 Journal Article %T Description and Performance of an L-Band Radiometer with Digital Beamforming %A Xavier Bosch-Lluis %A Isaac Ramos-Perez %A Adriano Camps %A Nereida Rodriguez-Alvarez %A Enric Valencia %A Juan F. Marchan-Hernandez %J Remote Sensing %D 2011 %I MDPI AG %R 10.3390/rs3010014 %X This paper presents the description and performance tests of an L-band microwave radiometer with Digital Beamforming (DBF), developed for the Passive Advanced Unit (PAU) for ocean monitoring project. PAU is an instrument that combines, in a single receiver and without time multiplexing, a microwave radiometer at L-band (PAU-RAD) and a GPS-reflectometer (PAU-GNSS-R). This paper focuses on the PAU£¿RAD beamformer¡¯s first results, analyzing the hardware and software required for the developed prototype. Finally, it discusses the first results measured in the Universitat Polit¨¨cnica de Catalunya (UPC) anechoic chamber. %K radiometry %K digital beamforming %K FPGA %U http://www.mdpi.com/2072-4292/3/1/14