Characteristics of radar range finders with the probing chirp signals synthesized on the digital DDS technology

The characteristics (accuracy and resolution) radar range finders that use direct digital frequency synthesis (DDS) to generate a chirped probe microwave signals are investigated. It is shown that in this case the accuracy and resolution of the radar range finder is limited switching time of the frequency in a DDS synthesizer. At the time of switching frequencies in the DDS synthesizer is much smaller than the inverse of the frequency deviation of the chirp signal characteristics radar range finder with the probe chirp signal synthesized by digital technology DDS, does not differ from the characteristics of the radar range finder with analog chirp signal. Found that the algorithm ranging in synthesizing probing chirped on digital technology DDS is significantly different from the algorithm ranging in the formation of the probe chirp signal analog way. Propose an algorithm estimates the range on the spectrogram of the beat signal during the synthesis of the probe chirp signal technology DDS.