**4.3 High-precision calibration technology**

Thrust or impulse measurement is to use the vibration differential equation of the measurement system to calculate thrust or impulse inversely. The calibration accuracy of system parameters will directly affect the accuracy of the thrust or impulse measurement. Therefore, high-precision system parameter calibration technology is one of the key technologies of thrust or impulse measurement. The difficulty of highprecision system parameter calibration is the suppression of environmental noise interference and the generation of high-precision constant force. In addition to the influence of environmental noise on the calibration accuracy of system parameters, the generation and acquisition method of high-precision constant force is an effective technical way to improve the calibration accuracy of system parameters.
