Angular momentum conservation-based satellite instantaneous stress anomaly analysis method

The invention provides a satellite instantaneous stress anomaly analysis method based on angular momentum conservation, which comprises the following steps: calculating angular momentum variation through relative angular momentum difference analysis or whole satellite angular momentum variation analysis, and if the satellite angular momentum is instantaneously changed, judging that a satellite is subjected to instantaneous spatial external force; the relative angular momentum difference value analysis is to calculate and analyze the difference value between the instantaneous angular momentum change of a satellite rotating part and the angular momentum change generated by satellite rotation, and if the difference value is not 0, the satellite is judged to be subjected to external force; in the whole-satellite angular momentum change analysis, the star angular momentum, the flywheel angular momentum and the angular momentum of other rotating parts form the whole-satellite angular momentum, and the satellite ang