Method and system for mobile device localization in extreme ambient conditions

Abstract

A method and system for localizing a mobile device in extreme ambient conditions. The method, executed in a processor of the mobile device, comprises detecting, using a temperature sensor of the mobile device at a first sampling rate, an ambient temperature anomaly along an indoor route being traversed, determining, based on switching to a second sampling rate, that the ambient temperature anomaly persists over a sequence of positions along the indoor route, filtering a set of barometric ambient pressure measurements contemporaneously associated with the sequence of positions, the set obtained using a barometric pressure sensor of the mobile device, and localizing the mobile device based at least partly on the filtered set of barometric ambient pressure measurements.

1 . A method for localizing a mobile device having a processor and a memory, the method comprising:
 detecting, using a temperature sensor of the mobile device at a first sampling rate, an ambient temperature anomaly along an indoor route within an indoor facility being traversed;   filtering, based on the detecting, a set of barometric ambient pressure measurements contemporaneously associated with a sequence of positions along the indoor route, the set obtained using a barometric pressure sensor of the mobile device, the filtering based at least in part on discarding at least a portion of the set of barometric ambient pressure measurements; and   localizing the mobile device based at least partly on the filtered set of barometric ambient pressure measurements.   
     
     
         2 . The method of  claim 1  wherein the method comprises determining, based on switching to a second sampling rate, that the ambient temperature anomaly persists over the sequence of positions along the indoor route, and wherein the filtering is performed, when it is determined that the that the ambient temperature anomaly persists over the sequence of positions. 
     
     
         3 . The method of  claim 1  wherein, when the indoor facility is a multi-floor facility, the localizing identifies a floor number within the multi-floor facility. 
     
     
         4 . The method of  claim 1  wherein the localizing further comprises matching the filtered set of barometric ambient pressure measurements with barometric fingerprint data of a fingerprint data repository. 
     
     
         5 . The method of  claim 4  wherein the fingerprint data repository is one of accessible in the memory and accessible from a server computing device via a wireless communication network. 
     
     
         6 . The method of  claim 4  wherein the fingerprint data repository further includes at least one of wireless signal strength data, wireless connectivity data, accelerometer data, gyroscope data, magnetometer data and ambient lighting sensor data associated with the respective positions along the route. 
     
     
         7 . The method of  claim 1  wherein the set of barometric ambient pressure measurements is contemporaneous with a duration of the temperature anomaly that exceeds a predetermined threshold temperature for at least a portion of the sequence of positions. 
     
     
         8 . The method of  claim 8  wherein the second sampling rate comprises a frequency that exceeds the first sampling rate. 
     
     
         9 . The method of  claim 1  further comprising algorithmically smoothing the filtered set of barometric ambient pressure measurements prior to the localizing. 
     
     
         10 . The method of  claim 1  wherein the temperature anomaly is detected when a rate of increase of temperature is greater than a predetermined rate. 
     
     
         11 . A mobile device comprising:
 a processor;   a memory storing a set of instructions, the instructions executable in the processor to:
 detect, using a temperature sensor of the mobile device at a first sampling rate, an ambient temperature anomaly along an indoor route being traversed; 
   filter, based on the detecting, a set of barometric ambient pressure measurements contemporaneously associated with a sequence of positions along the indoor route, the set obtained using a barometric pressure sensor of the mobile device, the filtering based at least in part on discarding at least a portion of the set of barometric ambient pressure measurements; and   localize the mobile device based at least partly on the filtered set of barometric ambient pressure measurements.   
     
     
         12 . The mobile device of  claim 11  wherein the processor is to determine, based on switching to a second sampling rate, that the ambient temperature anomaly persists over the sequence of positions along the indoor route, and wherein the filtering is performed, when it is determined that the that the ambient temperature anomaly persists over the sequence of positions. 
     
     
         13 . The mobile device of  claim 11  wherein, when the indoor facility is a multi-floor facility, the localizing identifies a floor number within the multi-floor facility. 
     
     
         14 . The mobile device of  claim 11  wherein the localizing further comprises matching the filtered set of barometric ambient pressure measurements with barometric fingerprint data of a fingerprint data repository. 
     
     
         15 . The mobile device of  claim 14  wherein the fingerprint data repository is one of accessible in the memory and accessible from a server computing device via a wireless communication network. 
     
     
         16 . The mobile device of  claim 14  wherein the fingerprint data repository further includes at least one of wireless signal strength data, wireless connectivity data, accelerometer data, gyroscope data, magnetometer data and ambient lighting sensor data associated with the respective positions along the route. 
     
     
         17 . The mobile device of  claim 11  wherein the set of barometric ambient pressure measurements is contemporaneous with a duration of the temperature anomaly that exceeds a predetermined threshold temperature for at least a portion of the sequence of positions. 
     
     
         18 . The mobile device of  claim 18  wherein the second sampling rate comprises a frequency that exceeds the first sampling rate. 
     
     
         19 . The mobile device of  claim 11  further comprising instructions executable in the processor to algorithmically smooth the filtered set of barometric ambient pressure measurements prior to the localizing. 
     
     
         20 . The mobile device of  claim 11  wherein the temperature anomaly is detected when a rate of increase of temperature is greater than a predetermined rate.