Low cost signal processing scheme of open loop IFOG

A low cost signal processing of open loop IFOG was described. A phase tracking technique was applied to improve the performance of IFOG. The periodic emendation of the electric components excursion improved the stability of the PZT. A sinusoidal was used as a bias phase modulation wave and the open loop demodulation used the weak signal detection technique. The advantages of this scheme are low cost and easy to realize, and it can satisfy applications to land navigation or position system.