Performance of an Atom Interferometric Device through Complementary Filtering

A method comprising:

• sensing an acceleration at i) a first accelerometer that comprises an atomic interferometer sensor and ii) a second accelerometer, resulting in first measurement made by the first accelerometer and a second measurement made by the second accelerometer, the first measurement being affected by a transfer function that characterizes the atomic interferometer sensor;
• adjusting the second measurement with an approximation of the transfer function, resulting in an adjusted measurement, the approximation of the transfer function being based on i) a time spacing TR between two adjacent Raman beams that are used by the atomic interferometer sensor in providing the first measurement and ii) an output delay TOD that corresponds to the difference between a) a time at which the sensing of the acceleration by the atomic interferometer sensor is valid and b) a time at which the atomic interferometer sensor makes available the value of the first measurement;
• and
• generating a filtered acceleration measurement, based on i) the first measurement and ii) the adjusted measurement.

A method comprising:

• sensing an acceleration at a conventional accelerometer which utilizes a means for sensing the acceleration other than atomic interferometry, resulting in a raw acceleration measurement;
• adjusting the raw acceleration measurement with an approximation of a transfer function that characterizes an atomic interferometer sensor, resulting in an adjusted measurement, the approximation of the transfer function being based on i) a time spacing TR between two adjacent Raman beams that are used by the atomic interferometer sensor in producing an independent measurement of the acceleration, the independent measurement being independent in relation to the raw measurement, and ii) an output delay TOD that corresponds to the difference between a) a time at which the independent measurement is valid and b) a time at which the atomic interferometer sensor makes available the independent measurement;
• comparing i) a first data sample that is based on the raw acceleration measurement and ii) a second data sample that is based on the adjusted measurement;
• and
• generating a filtered acceleration measurement, based on i) the comparison and ii) a third data sample that is based on the independent measurement.