Improving range precision of LFMCW radar based on frequency domain up-sampling-interpolating method

The paper presents a method based on the frequency domain up-sampling-interpolating method (FDUSIM) of the beat signal spectrum to improve the range precision of LFMCW radar. Simulation indicates that this method can effectively decrease the ranging error caused by the inherent frequency domain sampling spacing of FFT, and can also accurately reflect the beat signal spectrum characteristic of multiple different range targets in the whole frequency domain. This method overcomes the limitation of the chirp-Z or zoom-FFT method which can only be used in local frequency domain thinning. Furthermore, the calculation of this method can be decreased considerably compared with the adding zeros FFT, which has the same frequency domain sampling intervals as the FDUSIM.