Satellite downlink signal arrival time high-precision estimation method and device and medium

Abstract

The invention discloses a satellite downlink signal arrival time high-precision estimation method and device and a medium, and the method comprises the steps: S1, obtaining a satellite position and a satellite user terminal position at an initial moment, and calculating the signal space transmission time delay at a current moment; s2, predicting the position of the satellite user terminal at the moment after the signal space transmission delay at the current moment is added to the initial moment; s3, calculating the signal space transmission delay of the transmitted signal at the initial moment to the predicted position of the satellite user terminal at the moment S2, and recording the signal space transmission delay as the signal space transmission delay at the current moment; and S4, comparing the difference value of the adjacent signal space transmission time delays with preset precision, if a condition is met, recording the signal space transmission time delay at the current moment as the downlink signal space transmission time delay of the satellite system, otherwise, repeating the steps until the difference value meets the condition. According to the invention, accurate calculation of the space transmission delay of the downlink signal of the satellite system is realized.

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