G | PHYSICS |
01 | MEASURING; TESTING |
S | 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 |
13 | Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified |
02 | Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems |
06 | Systems determining position data of a target |
08 | Systems for measuring distance only |
32 | using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated |
34 | using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal |