Systems for determining distance or velocity not using reflection or reradiation (position-fixing by co-ordinating two or more distance determinations G01S5/00)

Child Classifications

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• G01S 11/02 using radio waves (G01S19/00 takes precedence)
• G01S 11/12 using electromagnetic waves other than radio waves
• G01S 11/14 using ultrasonic, sonic or infrasonic waves
• G01S 11/16 using difference in transit time between electrical and acoustic signals