Patent ID: 11959993
Assignee: TAKEMETUIT INC.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 5:
6. The method of claim 1, further comprising:
receiving acoustic frequency signals at the receiver;
for each beacon signal transmitted from a working subset of at least three of the plurality of differently located beacon devices:
filtering the received acoustic frequency signals by the frequencies of the frequency pattern for the beacon signal to generate a filtered signal;
carrying out a correlation in time of the filtered signal with a version of the information component of the beacon signal;
identifying a correlation peak from the correlation, the correlation peak providing time-delay information of the beacon signal; and

applying multilateration to determine a position of the receiver based on the location of each beacon device of the working subset of beacon devices and the time-delay information of the beacon signals received from the working subset of beacon devices.