How is the target detected in a tracking radar?
A radar transmits a short pulse of RF energy at a tightly controlled frequency. This pulse is repeated at a set rate (PRR or Pulse repetition Rate) This rate determines the range of the radar (IIRC 300microsec prr corresponds to 300miles) During the time between pulses the Radar receiver "listens" for any signal at the frequency of the transmitted pulse. If there is a "target" inside of the range of the radar you will receive a return signal at the same time after each pulse is transmitted. This will return will show up at a fixed location (it will move slowly) on the display.
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