Moving direction determination with noisy signals from inertial navigation systems on mobile devices

A device, comprising:

• memory configured to store mobile device data;
• and
• a processor coupled to the memory, the processor being configured to:
• receive a plurality of acceleration readings associated with a mobile device and to store the acceleration readings in the memory as at least a portion of the mobile device data;
• perform high pass filtering on the received acceleration readings to obtain a high frequency component;
• determine shaking energy from the high frequency component;
• and
• determine a primary direction of movement of the mobile device based on the determined shaking energy.

A tangible, non-transitory computer program product on which computer readable instructions of a computer program are stored, the instructions, when executed by a processor, cause the processor to perform a method of determining a direction of movement of a mobile device, the method comprising:

• receiving a plurality of acceleration readings associated with the mobile device;
• performing high pass filtering on the received acceleration readings to obtain a high frequency component;
• determining shaking energy from the high frequency component;
• and
• determining a primary direction of movement of the mobile device based on the determined shaking energy.