Abstract: In the context of 'electromagnetic spectrum warfare', radar technology is actively expanding toward intelligent, digital, multi-functional integrated detection and integrated radio frequency, driving direct radio frequency digitization to become a trend in the design of digital array receiver systems. Focusing on the design requirements for ultra-wideband signal digital receiver systems, the engineering limitations of traditional super-heterodyne architectures, single-sampling rate radio frequency direct sampling techniques, and 'hetero-frequency'sampling techniques are analyzed in this paper in achieving real-time full-band information extraction of ultra-wideband signals with high-performance results. To address these issues, 'hetero-rate' sampling, digital channelization, analog channelization, frequency diversity, and high-linearity link design are integrated in this paper, and a direct radio frequency sampling digital receiver architecture based on simultaneous dual-sampling rates cross-blanking is proposed. The engineering design considerations are analyzed, and the practical implementation examples are also provided. The proposed architecture not only achieves real-time full-band coverage of ultra-wideband signals but also achieves performance and interference resistance comparable to that of super-heterodyne intermediate-frequency digital receiver architectures.