**4.4 High-precision evaluation technology**

Thrust or impulse measurement is to give the measurement results of micro-thrust or impulse of millinewton (s) or even micro-newton (s) under the conditions of environmental noise interference suppression, micro-system response measurement, and high-precision system parameter calibration, as well as the evaluation conclusions with high confidence. Therefore, high-precision thrust or impulse measurement and evaluation technology is one of the key technologies of thrust or impulse measurement.
