Adaptive inertial measurement system and method

A system, comprising:

• a processor that operates one or more control loops that enable gyroscopic angular measurement for an inertial measurement unit (IMU), wherein each of the one or more control loops operates over a range of set points defined for each of the respective control loops;
• a dynamic loop adjuster that receives environmental input data to determine environmental conditions for the IMU, wherein the dynamic loop adjuster alters at least one of the set points for at least one of the one or more control loops operated by the processor based on the determined environmental conditions;
• a fiber optic gyroscope (FOG) circuit that generates a modulated optical signal representing angular motion for the IMU;
• an optical receiver to convert the modulated output signal from the FOG to an electrical signal representing the angular motion of the IMU;
• and
• an analog-to-digital (A/D) converter to convert the electrical signal from the optical receiver to a digital signal for the processor, wherein the processor employs an automatic gain control (AGC) loop to control the electrical signal gain of the optical receiver, employs an offset control loop to control electrical offsets in one or more circuits of the IMU, and a phase modulator scale factor loop to track sensitivity information of the modulated optical signal from the FOG.

A method, comprising:

• executing, by a processor, at least one of an automatic gain control (AGC) loop, an offset loop, and a phase modulator scale factor loop that enable gyroscopic angular measurement for an inertial measurement unit (IMU), wherein each of the at least one of the AGC loop, the offset loop, and the phase modulator scale loop operates over a range of set points defined for each of the respective control loop;
• receiving, by the processor, environmental data relating to a dynamic condition of the IMU;
• determining, by the processor, if the dynamic condition exceeds a predetermined threshold for the IMU based on the received environmental data;
• and
• adjusting, by the processor, at least one of the AGC loop, the offset loop, and the phase modulator scale factor loop based on the determining, wherein a gain of the AGC loop is adjusted in accordance with a digital gain factor and an analog gain factor, wherein the analog gain factor is increased and the digital gain factor is decreased during low dynamic conditions, or the analog gain factor is decreased and the digital gain factor is increased during high dynamic conditions.