Analyzed the changes to the Ultra-Wide Band (UWB) physical layer of the latest IEEE 802.15.4z protocol, and designed three types of Low Frequency Pulse Ultra-Wide Band (LRP UWB) based on MATLAB Working mode and high-frequency pulse ultra-wideband (High Frequency Pulse Ultra-Wide Band, HRP UWB) communication ranging integrated system, and under the conditions of 802.15.4 CM1 channel simulation and comparison of the bit error rate of each system (Bit- Error-Rate, BER) and ranging accuracy to analyze the UWB system performance characteristics under different operating modes. The bit error rate simulation result is that LRP UWB is lower than HRP UWB, and the LRP long-range mode has the lowest bit error, and the signal-to-noise ratio is 10-4 above 15, indicating that the long-range mode communication link is the most stable. The range simulation results show that the three modes of the LRP UWB system are comparable to the HRP UWB system in terms of range performance within 20m, with an accuracy of 0.1m; while the LRP UWB long-range mode has a better range accuracy than 0.1m over 100m, and the other modes have an accuracy of 0.5m or more, indicating that the long-range mode is more suitable for long-range range. Finally, the range measurement capability of the pulse accumulation ranging system was designed and simulated, and its range accuracy was better than 0.4m over a distance of 100m, which is more than twice the accuracy of a single pulse in long-range mode, indicating that the use of pulse accumulation ranging technology can further improve the system's long-range range measurement capability.