LI Xin. Time Delay Estimation of Chirp Signals Based on Double-Channel DFRFT Cross-Spectrum[J]. Acta Electronica Sinica, 2014, 42(6): 1068-1073. DOI: 10.3969/j.issn.0372-2112.2014.06.005.
For the problem of time-delay estimation for Chirp pulse signals
the characteristics of Chirp pulse signals based on the discrete fractional Fourier transform was theoretically derived.When time-delay equivalent frequency parameter was greater than the sampling rate in fractional Fourier domain
the spectrum of Chirp pulse signals in fractional Fourier domain produced aliasing
which caused the delay estimation ambiguity problem.In order to solve this problem
the time-delay estimation of Chirp signal based on double-channel DFRFT cross-spectral method was proposed
then the principles of the two-channel sampling rate selection and the performance analysis was given.The experimental results show that
in a certain sampling rate
the proposed algorithm is able to quickly and accurately estimate the time-delay parameters of Chirp pulse signals.