Initiation of calibration of multiple sensor modules related to an orientation of a user of the sensor modules

A system, comprising:

• a computing device, comprising:
• one or more processors;
• and
• a non-transitory computer-readable medium including one or more sequences of instructions that, when executed by the one or more processors, causes:
• receiving, in the computing device, periodic measurements of accelerations from a plurality of sensor modules;
• determining, by the computing device, whether each respective sensor module of the sensor modules is attached to a respective part of a user from the periodic measurements of accelerations from the plurality of sensor modules as received, comprising:
• calculating, by the computing device, an average value of the accelerations measured by an accelerometer in the respective sensor module within a period of time;
• determining, by the computing device, a noise deviation of the accelerations from the average value;
• comparing, by a computing device, the noise deviation of the accelerations and a predetermined threshold, and determining, by the computing device, that the respective sensor module is attached to the respective part of the user when the noise deviation increases to above the predetermined threshold;
• and
• in response to the determination that each respective sensor module of the sensor modules is attached to the respective part of the user,
• initiating, by the computing device, a calibration operation to calibrate orientation measurements of the sensor modules relative to a common reference system defined based on an orientation of the user.

A non-transitory computer storage medium storing instructions which, when executed by a computing device, instructs the computing device to perform a method, the method comprising:

• receiving, in a computing device, periodic measurements of accelerations from a plurality of sensor modules;
• determining, by the computing device, whether each respective sensor module of the sensor modules is attached to a respective part of a user from the periodic measurements of accelerations from the plurality of sensor modules as received, comprising:
• calculating, by the computing device, an average value of the accelerations measured by an accelerometer in the respective sensor module within a period of time;
• determining, by the computing device, a noise deviation of the accelerations from the average value;
• comparing, by a computing device, the noise deviation of the accelerations and a predetermined threshold, and determining, by the computing device, that the respective sensor module is attached to the respective part of the user when the noise deviation increases to above the predetermined threshold;
• and
• in response to the determination that each respective sensor module of the sensor modules is attached to the respective part of the user,
• initiating, by the computing device, a calibration operation to calibrate orientation measurements of the sensor modules relative to a common reference system defined based on an orientation of the user.