DIFF Subgroup
G01S 13/50 Systems of measurement based on relative movement of target
Introduced: January 1980
Full Title
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 > Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems > Systems of measurement based on relative movement of target
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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- G01S 13/52 Discriminating between fixed and moving objects or between objects moving at different speeds since 1980 IPC+CPC Available in IPC and CPC
- G01S 13/58 Velocity or trajectory determination systems; Sense-of-movement determination systems since 1980 +5 CPC IPC+CPC Available in IPC and CPC