1. Is there any relationship between the celestial coordinate system and the earth coordinate system and the rotation of the earth, which one is convenient to describe the space position of the ground observation station and which one is convenient to describe the position of the artificial earth satellite?
The celestial coordinate system is an inertial coordinate system, which has nothing to do with the rotation of the earth, and is convenient for describing the position of the artificial earth satellite. The
earth coordinate system can be regarded as a coordinate system fixed on the earth, which is related to the rotation of the earth and is convenient for describing the space of the ground observation station. position.
2. Please summarize the spatiotemporal reference of GNSS positioning in a similar way as a mind map?
3. What is the significance of the time system in GPS satellite positioning?
Because different satellites have different distances from the locator, there is also a slight difference in the time that the signals sent by the satellites reach the locator. In order to ensure that the relative position can be obtained in relative time, the time system plays a big role.
