Abstract: Range tracking is very important for stepped frequency pulsed (SFP) radar one dimentional range profile. Limitations of the range profile method used in our experimental radar are discussed. Adopting digital range tracking, the sampling rate of A/D converter and the operation needed can be reduced greatly. Digital range tracking can also be used to estimite the target velocity and make velocity compensation when range profile is made. A scheme of digital range tracking using single chip computer is presented.