For improving the range accuracy of LFMCW Radar with triangle wave modulation, frequency estimation performance of Jacobsen algorithm and Quinn algorithm are discussed. When the signal frequency is close to the midpoint of two neighboring discrete frequencies, Jacobsen algorithm has poor accuracy, while Quinn algorithm has good one. A novel combined algorithm named J-Quinn algorithm is proposed. Firstly, Jacobsen algorithm is employed for coarse frequency estimation. Secondly, the signal frequency is shifted to the midpoint of two neighboring discrete frequencies, and then Quinn algorithm is employed for fine frequency estimation. The simulation shows that J-Quinn algorithm has higher range accuracy and good stability. Ranging experiments are performed with LFMCW Radar, and the results show that range error can be diminished to 0.04m, so the ranging performance is improved.
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