To investigate the application of RF system level chip—Radio Frequency System-on-Chip (RFSoC) in pulse radar system, a radar ranging system with high performance digital-analog hybrid signal processing capability is designed. The high-performance RFSoC development board—IW-RFSoC- 49DR(including the design of the background interference filtering algorithm) is adopted, and the test environment is set in a laboratory with narrow space and disturbed multimetallic equipments. The results of the experiments show that the experimental data are significantly disturbed in an untreated, complex indoor environment; after implementing the background interference filtering algorithm, the display resolution of the frequency spectrum map has been significantly improved. As the test target distance increases from 3 m to 12 m, the ranging error decreases from 53 cm to 5 cm. RFSoC technology shows significant advantages in the design of pulsed radar system, realizing the high integration and low power consumption design, and laying a foundation for the subsequent design of portable radar based on RFSoC.