Hybrid positioning method, electronic apparatus and computer-readable recording medium thereof
Hybrid positioning methods and electronic apparatuses are provided. A representative method includes: obtaining initial location information; computing initial moving information based upon the sensor readings; computing estimated location information based on the initial moving information and the initial location information; acquiring geographical location readings if a location update condition is satisfied; generating reference location information based on the geographical location readings acquired; comparing the estimated location information with the reference location information to obtain a deviation information; computing a calibrated moving information based on the estimated location information and the deviation information; and computing a calibrated location information based on the deviation information, calibrated moving information and the estimated location information.
1. An electronic apparatus, comprising:
an absolute positioning device having circuitry, the absolute positioning device being configured to sample location readings from a GPS receiver; and
a relative positioning device having inertial sensors, configured to produce sensor readings regarding movement of the electronic device; and
a sensor hub having processing circuitry, configured to:
operate in an always-on mode to periodically fetch sensor readings from the relative positioning device to calculate a relative location information based on the sensor readings, wherein the relative location information includes an estimated moving distance and an estimated rotating angle associated with the electronic device;
request location readings from the absolute positioning device to determine an absolute location information based on the location readings;
determine initial reference location information and stop requesting location readings from the absolute positioning device based thereon;
determine that a location update condition is satisfied based on the estimated moving distance and the estimated rotating angle; and
start requesting location readings to obtain an updated reference location information based on the location update condition being satisfied;
wherein the absolute positioning device is configured to operate in a power-saving mode in response to the sensor hub stopping the requests for location readings to reduce power consumption of the electronic apparatus, and in a location information-acquiring mode in response to the sensor hub starting the requests for the location readings such that, responsive to the location update condition being satisfied, the absolute positioning device operates in the location information-acquiring mode until the updated reference location information is determined, after which the absolute positioning device operates in the power-saving mode.
2. The electronic apparatus of claim 1 , wherein the electronic apparatus comprises a wearable mobile device.
3. The electronic apparatus of claim 2 , wherein the wearable mobile device incorporates at least one of the absolute positioning device, the relative positioning device and a display device.
4. The electronic apparatus of claim 1 , wherein:
the sensor hub is configured to calculate a traveling distance based on a previous reference location, the estimated moving distance, and the estimated rotating angle associated with the electronic device; and
the location update condition is satisfied responsive to the traveling distance being greater than a distance threshold.
5. The electronic apparatus of claim 1 , wherein an MCU of the sensor hub is configured to switch the absolute positioning device into the location information-acquiring mode and the power-saving mode.
6. The electronic apparatus of claim 5 , wherein a first time interval for maintaining the absolute location device in the location information-acquiring mode is substantially smaller than a second time interval during which the MCU fetches sensor readings from the relative positioning device so as to reduce power consumption.