Method and apparatus for mobile device localization
View Patent ↗Because GPS does not work indoors, mobile electronics devices that use GPS for activities do not work inside a building. An embodiment of the present invention uses ultrasonic tone generators in each room. The ultrasonic tone generators can be built into cameras or separate devices. Each device may emit a unique tone that has a high enough frequency that most people cannot hear the frequency or combination of frequencies. Using a built-in microphone on a mobile device, the incoming audio may be analyzed in the frequency domain to determine the loudest tone above the human hearing threshold. This tone may be mapped to a specific room that can then be sent to the mobile electronics device to perform any location-aware actions.
1. A method of providing indoor localization, the method comprising:
emitting signals at multiple fixed locations within an indoor facility with multiple floors and multiple rooms on each floor, the signals being unique at each location relative to the signals at adjacent locations within the indoor facility, the signals being non-radio frequency signals perceptible by a mobile electronics device, each signal encoded to correspond to both the respective floor and the respective room on each floor within the facility from which each signal is emitted and known to the mobile electronics device by way of a look-up table, the look-up table being a multi-dimensional data structure with dimensions corresponding to the floors and the rooms on each floor within the facility; and
transmitting the look-up table, on a temporary basis, to the mobile electronics device as the mobile electronics device enters the indoor facility.
2. The method according to claim 1 wherein emitting the signals includes emitting human-imperceptible signals.
3. The method according to claim 2 wherein emitting the human-imperceptible signals includes emitting ultrasonic signals.
4. The method according to claim 2 wherein emitting the human-imperceptible signals includes emitting signals at non-visible optical wavelengths.
5. The method according to claim 1 wherein emitting the signals includes emitting multiple tones at or above 20 kHz separated by at least 250 Hz and at or below 40 kHz at each location within the indoor facility, wherein the combination of tones at each location is different from the combination of tones at each other location.
6. The method according to claim 1 wherein emitting the signals includes emitting a composite of multiple signals of different frequencies without modulation or emitting a composite of multiple signals of different frequencies with modulation on at least one of the frequencies.
7. The method according to claim 1 wherein emitting the signals includes emitting a single frequency having a unique modulation relative to signals at adjacent locations.
8. A system for providing indoor localization, the system comprising:
a controller configured with a mapping of multiple fixed locations within an indoor facility with multiple floors and multiple rooms on each floor, the mapping including parameters for signals to be emitted at the multiple fixed locations, the parameters being unique for each location relative to parameters at adjacent locations;
a signal generator at each location configured to generate a signal corresponding to a respective parameter;
an emitter at each location coupled to the respective signal generator and configured to emit a signal according to the respective parameter, the signals at the multiple fixed locations within the indoor facility being unique at each location relative to signals at adjacent locations within the indoor facility, the signals being non-radio frequency signals perceptible by a mobile electronics device, each signal encoded to correspond to both the respective floor and the respective room on each floor within the facility from which each signal is emitted and known to the mobile electronics device by way of a look-up table, the look-up table being a multidimensional data structure with dimensions corresponding to the floors and the rooms on each floor within the facility; and
a mapping distribution module configured to transmit, on a temporary basis, the look-up table to the mobile electronics device as the mobile electronics device enters the indoor facility.
9. The system according to claim 8 wherein the signal generator is configured to cause the emitter to emit human-imperceptible signals.
10. The system according to claim 9 wherein the signal generator is configured to cause the emitter to emit ultrasonic signals.
11. The system according to claim 9 wherein the signal generator is configured to cause the emitter to emit signals at non-visible optical wavelengths.
12. The system according to claim 8 wherein the signal generator is configured to cause the emitter to emit multiple tones at or above 20 kHz separated by at least 250 Hz and at or below 40 kHz at each location within the indoor facility, wherein the combination of tones at each location is different from the combination of tones at each other location.
13. The system according to claim 8 wherein the signal generator is configured to cause the emitter to emit a composite of multiple signals of different frequencies without modulation or emit a composite of multiple signals of different frequencies with modulation on at least one of the frequencies.
14. The system according to claim 8 wherein the signal generator is configured to cause the emitter to emit a single frequency having a unique modulation relative to signals at adjacent locations.
15. The system according to claim 8 wherein the emitter is embedded in a surveillance camera.