INDOOR LOCATION USING MAGNETIC FIELDS

摘要

A location system that employs multiple magnetic transmitters that provide magnetic fields modulated with respectively different identifying signals. A magnetic receiver extracts the identifying signal from the modulated magnetic field to determine its location. The magnetic transmitters may be configured as magnetic signal sources including magnetic pseudolites. The identifying signals are repeated at predetermined intervals such that the magnetic receiver accumulates the repeated identifying signals to provide processing gain.

主权项

1. A receiver comprising:
an antenna configured to receive modulated magnetic signals including a repetitive identification component signal; magnetic signal demodulating circuitry configured to demodulate the received modulated magnetic signals to recover a baseband signal including the repetitive identification component signal; signal processing functionality including: a matched filter configured to correlate the received magnetic signal with a code signal corresponding to the repetitive transmitter identification component signal to provide a correlation signal; and an accumulator configured to accumulate the correlation signals provided by the matched filter to determine a signal strength the received magnetic signal including the identification component signal; and a processor for processing signals provided by the signal processing functionality to determine a location of the magnetic receiver.