Variable path length control modulation frequency

A gyroscope system comprising:

• a gyroscope block having a plurality of cavities and a plurality of passages that define a path;
• a plurality of mirrors each located in one of the plurality of cavities, each of the plurality of mirrors configured to direct light along the path defined by the plurality of cavities and the plurality of passages;
• at least one mirror drive coupled to one of the plurality of mirrors and configured to change a position of the respective mirror, wherein the path's length is changed by the change in the position of the respective mirror;
• a dither system coupled to the gyroscope block and configured to induce an angular rotation of the gyroscope block;
• and
• a controller configured to provide a dither signal indicative of a dither frequency to the dither system and a path length control (PLC) signal indicative of a PLC frequency to the at least one mirror drive;
• wherein the dither system is responsive to the dither signal to induce the angular rotation of the gyroscope block at the dither frequency;
• wherein the at least one mirror drive is responsive to the PLC signal to change the position of the respective mirror at the PLC frequency;
• and
• wherein the controller is configured to calculate the PLC frequency as a function of the dither frequency.