The estimation of the range of the center of the radar beam,that is the range between the center of the target area and the radar platform,is determined by the method of sum-difference amplitude-comparison.The range gate corresponding to the null depth is the estimated distance.In the actual situation,it is difficult to determine the position of null depth due to the influence of noise,so the range estimation accuracy is poor.In order to obtain a high-precision range,a radar ranging method based on total variation minimization is proposed,which can effectively perform distance estimation.The method of minimizing the total variation can suppress the noise level well,improve the signal-to-noise ratio,and make the processed data flat,so it is easy to determine the position of null depth of sum-difference amplitude-comparison,thereby further determining the range gate corresponding to zero depth.Simulation results show that the method can well suppress noise and effectively improve the ranging accuracy.