A High-precision Distance Measurement Method Based on OTFS Signal

In order to solve the problem that the linear time-varying channel will lead to the decrease of the ranging and positioning accuracy of Orthogonal Frequency Division Multi-plexing (OFDM) signals in high-speed moving scenarios, this paper proposes a method for ranging using Orthogonal time frequency space (OTFS) signal. The delay Doppler domain and time-frequency domain characteristics of OTFS signals are used to realize ranging and positioning. Firstly, the signal is modulated to the delayed Doppler domain to cope with the influence of linear time-varying channels. Then, the transmission delay is estimated in the time domain by searching for the maximum correlated peak of the OTFS signal. Finally, the transmission delay is accurately estimated in the frequency domain. On this basis, the ranging performance of OTFS signal is analyzed, and the ranging accuracy of OFDM signal and OTFS signal is compared. The simulation results show that the ranging effect of OTFS signal is better than that of OFDM signal.