Abstract: Considering the real-time reconnaissance requirement of large instantaneous bandwidth and high frequency resolution，the design and implementation of an ultra wideband reconnaissance receiver is accomplished based on both analog and digital channelized technologies.The high speed FPGA design for digital channelized receiver is specially discussed.Reliable receiving of high speed data as well as the processing speed and resource optimizing inside the chip are sufficiently considered to insure the good performance of the digital system.Implementation and test results verify the stability of the receiver and its ability to fulfill the radio reconnaissance in large instantaneous bandwidth.