Sensor system for measuring a parameter

A sensor system for measuring a parameter of a body, the sensor system comprising:

• a first housing mountable to the body, the first housing comprising a first dual-axis accelerometer having a first measurement axis and a second measurement axis, the first dual-axis accelerometer arranged to measure a first acceleration along the first measurement axis and a second acceleration along the second measurement axis;
• a second housing mountable to the body, the second housing comprising a second dual-axis accelerometer having a third measurement axis and a fourth measurement axis, the second dual-axis accelerometer arranged to measure a third acceleration along the third measurement axis and a fourth acceleration along the fourth measurement axis;
• and
• a processor configured to:
• receive the first, second, third and fourth measured accelerations;
• and
• determine directly from the first, second, third and fourth measured accelerations, the parameter, without the use of approximation, integration, differentiation, maximum or minimum extreme values or consecutive changes of polarity of the accelerations.

A method of measuring a parameter of a body, the method comprising:

• measuring a first acceleration of a rotating part of the body along a first measurement axis;
• measuring a second acceleration of the rotating part along a second measurement axis;
• measuring a third acceleration of the rotating part along a third measurement axis;
• measuring a fourth acceleration of the rotating part along a fourth measurement axis;
• and
• determining the parameter directly from the first, second, third and fourth measured accelerations, without the use of approximation, integration, differentiation, maximum or minimum extreme values or consecutive changes of polarity of the accelerations.