In space vehicles, inertial navigation devices need to measure real-time and high-precision analog quantities such as currents and voltages output from accelerometers and other sensors in order to realize the navigation of the vehicle. Therefore, it is of great significance to develop a dynamic high-precision current and voltage measurement system suitable for use in spacecraft. The study firstly designs a current error monitoring system, and then introduces the main factors affecting the measurement accuracy of a standard power meter and explores the principle of current measurement error generation. Then, a compensation strategy for segmental integration of the d-axis current into the measured current is proposed. The simulation and experimental results show that the current monitoring system can effectively eliminate the interference of the outer-loop controller and significantly improve the control performance of the error compensator, and the compensation algorithm proposed in this paper can effectively reduce the measurement error of the measured sub-current and improve the steady state and dynamic performance of the machine speed control system.
