Method for maintaining autonomous orbit control of satellite semi-major axis based on autonomous calibration

The invention relates to a method for maintaining autonomous orbit control of a satellite semi-major axis based on autonomous calibration, and belongs to the field of spacecraft orbit control. The method comprises the steps of firstly, performing real-time satellite orbit calculation on the basis of GNSS (Global Navigation Satellite System) measurement or orbit extrapolation calculation; and secondly, comparing a nominal orbit semi-major axis which is bound on a satellite with a satellite average orbit semi-major axis which is calculated in real time, and performing autonomous thrust calibration and autonomous orbit control quantity calculation when an error is greater than an autonomous orbit control threshold for N times continuously. The real-time autonomous calibration of satellite mass and orbit control thrust is performed according to the real-time measurement of the temperature of a pressure sensor and a storage tank, then the orbit control duration is calculated according to the error between a target