Abstract:The performance indicators of the inertial measurement unit determine the navigation accuracy of the aircraft. As an important part of the inertial measurement unit, the I/F conversion circuit, improving its full-temperature linearity performance index is one of the important means to improve the navigation accuracy. Based on the high-precision navigation requirements of various aircraft, this paper analyzes the temperature compensation methods of high-precision I/F conversion circuits at home and abroad, including hardware circuit compensation and software algorithm compensation, and proposes a compensation method based on hardware circuits for the comprehensive error model. The full-temperature compensation of the linearity performance index of the I/F conversion circuit is achieved, significantly reducing the temperature drift of the I/F conversion circuit, effectively improving the overall performance index of the circuit, and meeting the index requirements of the navigation system for the inertial measurement unit.