Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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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
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15/00
Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
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G01S15/02
using reflection of acoustic waves
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G01S15/50
Systems of measurement, based on relative movement of the target
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G01S15/52
Discriminating between fixed and moving objects or between objects moving at different speeds
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