Digitized multiple frequency CW radar is a kind of new system radar.It can detect lots of targets and acquire different movement parameters as well.But it is hard to enlarge maximum unambiguous range while improving ranging accuracy at the same time.To deal with such a contradiction

stagger frequency differences are adopted

thus maximum unambiguous range can be enlarged greatly.The influences the noise may have on the ranging results are presented.Correct solutions for ambiguous range

the limitation for imput SNR

change in ranging accuracy and restriction to staggering parameters are discussed.Simulation results verify the conclusion

which could be a groundwork to future research.