with phase comparison between the received signal and the contemporaneously transmitted signal

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 determining position data of a target > Systems for measuring distance only > using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated > with phase comparison between the received signal and the contemporaneously transmitted signal

Classification Context

Section:

PHYSICS

Class:

MEASURING; TESTING

Subclass:

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

Child Classifications

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• G01S 13/38 wherein more than one modulation frequency is used
• G01S 13/4 wherein the frequency of transmitted signal is adjusted to give a predetermined phase relationship