A High Accuracy Calibration Method of Navigation Satellite TGD Parameters

Abstract

The invention discloses a high-precision navigation satellite TGD parameter calibration method. A vertical error of a navigation-satellite inter-frequency phase center is directly corrected. For a horizontal error, a multi-station weighting mode is adopted and a geometric layout of a ground station is fully used so as to carry out elimination. During a parameter calibration process, a position of a center of mass of a satellite and a position relation between the center of mass and a phase center are not needed; a position of a phase center is solved; and a precision requirement of multi-station weighted processing to a sub-satellite point coordinate of the satellite and an ionosphere puncture point coordinate is not high so that TGD parameter calibration precision is not influenced by a factory calibration error of the center of mass position of the satellite, changes of the center of mass of an on-orbit satellite in a mechanical coordinate system, a satellite attitude measurement error and a satellite orbit measurement error. A TGD estimation error caused by navigation-satellite inter-frequency phase center separation is reduced to 5%-15% of an original error. According to a size of actual phase center separation, the TGD estimation error caused by the phase center separation is controlled to be 4cm or be even below 9mm.

Description

technical field [0001] The invention relates to the technical field of on-orbit calibration of navigation satellites, in particular to a high-precision calibration method for TGD parameters of navigation satellites. Background technique [0002] Ionospheric delay is one of the main sources of error in user receiver measurements. The most effective way to eliminate the ionospheric delay error is to combine the measured values ​​of the two frequencies. The ensuing problem is the introduction of the inter-channel delay deviation (TGD) of the navigation satellite and the inter-channel delay deviation (IFB) of the user reception channel. The precise calibration of navigation satellite TGD parameters is of great significance to the user's positioning accuracy and timing accuracy. In addition, the satellite navigation system can be used to measure the total electron content (TEC) of the ionosphere, which has the advantages of high precision and low cost. The most important influe...

AI Technical Summary

Problems solved by technology

However, the current TGD parameter calibration method ignores the error sources of TGD parameters and their influence on the calibration results.

It is easy for people to think and solve the problem of pseudo code measurement error

In fact, due to the dispersion effect of the satellite transmission link, there is a certain geometric separation between the phase centers of the navigation satellite antenna at different frequencies, which will affect the calibration accuracy of TGD

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