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G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

G01S13/00—Systems using the reflection or reradiation of radio waves, eg radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified