1.   We can think of radar signals as a series of pulses, but each pulse has a so-called carrier frequency.

2.   Each one of those pulses has a carrier frequency of tens of thousands to hundreds of thousands of cycles per second.

3.   Similarly, each pulse of radar is a shriek of radio waves, with a high carrier frequency.

4.   The special feature of chirp radar is that it does not have a fixed carrier frequency during each shriek.

5.   Rather, the carrier frequency swoops up or down about an octave.