Coupling Of Lfmcw Radar Moving Target Detection And Speed To Distance

Because of the advantages pf no range blind area, high range resolution and low signal power, recently LFMCW radars attracted more and more attention. The theories, key technologies and application develop rapidly. Range-velocity decoupling is one of important scientific research directions. It is emphasis of the paper, too.Someone presented a method of changing cycle LFMCW radars to eliminate range-velocity coupling. But it is difficult to be realized. The paper proposes a method of frequency domain pairing according to frequency spectrum parameter of LFMCW beat signal.We know that range-velocity coupling couldn't be eliminated in the LFMCW radars of single frequency modulation slope. Based on the characteristic that the range shift is symmetrical between positive and negative frequency sweep in triangular frequency modulation continuous waves, a method of frequency domain pairing is proposed to solve range-velocity coupling problem. But the method is only suitable for simple object environments.LFMCW echo is modulated by Doppler frequency. According to the characteristic, moving targets with different ambiguous velocities could be classified via MTD, but the range-velocity coupling problem still exists.According to the advantages and disadvantages of both frequency domain pairing and MTD, a method combining Moving Target Detection with frequency domain pairing is proposed. The method first realizes detection and classification of moving targets with different ambiguous velocities via MTD in order to simplify the spectrum of beat signal, and then eliminates moving targets' range-velocity coupling with frequency domain pairing.Simulation and ambiguity function validates the effectiveness of the method .