Method and device for determining geographic positions of a geographic location tracker

A non-transitory computer readable medium comprising a computer program recorded thereon comprising instructions which when executed by a processor of a device configure the device to implement a method of determining geographical positions of a geographical location tracker for a sequence of measurements of the geographical location of said tracker, said sequence being ordered according to a measurement time of said measurements, said method comprising:

• obtaining said sequence from said tracker;
• for a measurement of said sequence, called indexed measurement,
• partitioning all of said measurements into a first ordered set comprising said measurements having a measurement time that is prior to the indexed measurement and a second ordered set comprising said measurements having a measurement time that is after the indexed measurement, the indexed measurement being either the last measurement of the first set or the first measurement of the second set;
• computing a statistical datum for said second set;
• and
• computing a distance, associated with said indexed measurement, between said sets on the basis of a distance between the statistical data of said sets;
• and
• determining a maximum distance from among the distances computed for all of the indexed measurements of said sequence;
• the statistical datum of the first set defined for the indexed measurement associated with said maximum distance corresponding to a first position of said tracker and the statistical datum of the second set defined for the indexed measurement associated with said maximum distance corresponding to a second position of said tracker,
• wherein:
• the tracker includes an accelerometer;
• and
• a frequency at which the measurements of the sequence are obtained from said tracker increases upon detection of an activation of the accelerometer.

A device for determining geographical positions of a geographical location tracker, said device comprising:

• a processor;
• and
• a non-transitory computer readable medium comprising a computer program recorded thereon comprising instructions which when executed by the processor configure the device to implement a method comprising:
• obtaining a sequence of measurements of the geographical location of said tracker from said tracker, said sequence being ordered according to a measurement time of said measurements;
• for a measurement of said sequence, called indexed measurement,
• partitioning all of said measurements into a first ordered set comprising said measurements having a measurement time that is prior to the indexed measurement and a second ordered set comprising said measurements having a measurement time that is after the indexed measurement, the indexed measurement being either the last measurement of the first set or the first measurement of the second set;
• computing a statistical datum for said first set;
• computing a statistical datum for said second set;
• and
• computing a distance, associated with said indexed measurement, between said sets on the basis of a distance between the statistical data of said sets;
• determining a maximum distance from among the distances computed for all of the indexed measurements of said sequence;
• and
• determining that the statistical datum of the first set defined for the indexed measurement associated with said maximum distance corresponds to a first position of said tracker and that the statistical datum of the second set defined for the indexed measurement associated with said maximum distance corresponds to a second position of said tracker,
• wherein:
• the tracker includes an accelerometer;
• and
• a frequency at which the measurements of the sequence are obtained from said tracker increases upon detection of an activation of the accelerometer.

A system for determining geographical positions of a geographical location tracker, said system comprising:

• a device for determining geographical positions of the geographical location tracker, said device comprising:
• a processor;
• and
• a non-transitory computer readable medium comprising a computer program recorded thereon comprising instructions which when executed by the processor configure the device to implement a method comprising:
• obtaining a sequence of measurements of the geographical location of said tracker, said sequence being ordered according to a measurement time of said measurements;
• for a measurement of said sequence, called indexed measurement,
• partitioning all of said measurements into a first ordered set comprising said measurements having a measurement time that is prior to the indexed measurement and a second ordered set comprising said measurements having a measurement time that is after the indexed measurement, the indexed measurement being either the last measurement of the first set or the first measurement of the second set;
• computing a statistical datum for said first set;
• computing a statistical datum for said second set;
• and
• computing a distance, associated with said indexed measurement, between said sets on the basis of a distance between the statistical data of said sets;
• determining a maximum distance from among the distances computed for all of the indexed measurements of said sequence;
• and
• determining that the statistical datum of the first set defined for the indexed measurement associated with said maximum distance corresponds to a first position of said tracker and that the statistical datum of the second set defined for the indexed measurement associated with said maximum distance corresponds to a second position of said tracker,
• wherein:
• the geographical location tracker is configured to send the measurements to the device;
• said tracker comprises an accelerometer;
• and
• said tracker is configured to increase a frequency of sending said measurements upon detection of an activation of the accelerometer.