A Synthetic Ultrawideband Range Profiling Method for High-Speed Targets Based on Phase-Derived Velocity Measurement

Compared with traditional synthetic wideband signals, synthetic ultrawideband (UWB) signals with higher range resolution can obtain more information for target identification. The stepped-frequency chirp signal (SFCS) based on dechirp processing can simultaneously achieve a UWB, a high data rate and a low sampling rate. In this paper, a synthetic UWB range profiling method for high-speed targets based on phase-derived velocity measurement (PDVM) is proposed. High-precision velocity compensation is key to synthetic UWB range profiling for high-speed targets. Thus, the PDVM based on the pulses at the same carrier frequency is adopted to obtain high-precision velocity measurement results. Then, based on PDVM results, the synthetic UWB range profiling method in the time domain is analyzed in detail, which mainly contains time shift, linear phase correction and constant phase correction. In the phase correction process, the compensation of intrapulse Doppler modulation, range migration and tracking gate movement is emphatically analyzed. In addition, to guide the implementation in radar systems, the phase hopping caused by parameter estimation error is theoretically derived. Finally, simulation results and raw data are presented to verify the performance of the proposed method.