Patent ID: 11899106
Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 19:
20. A method of measuring a distance of a low-height obstacle from a vehicle, comprising:
providing a selected one of an amplitude-modulation (AM) signal in an AM mode and a chirp signal in a chirp mode using a transmitter adapted to be coupled to an acoustic transducer;
receiving a digital received signal using a receiver adapted to be coupled to said acoustic transducer; and
during a first measurement period:
placing said transmitter into said one of said AM mode and said chirp mode using a first channel;
selectively detecting a first direct echo in said first channel of said digital received signal of said one of said AM signal and said chirp signal; and
selectively detecting a first indirect echo in a second channel of said digital received signal of said one of said AM signal and said chirp signal, and

during a second measurement period subsequent to said first measurement period:
placing said transmitter into another one of said AM mode and said chirp mode using said first channel;
selectively detecting a second direct echo in said first channel of said digital received signal of another one of said AM signal and said chirp signal; and
selectively detecting a second indirect echo in said second channel of said digital received signal of said one of said AM signal and said chirp signal.