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GLONASS almanac parameter estimation method used for satellite navigation

A technology of parameter estimation and satellite navigation, applied in the field of satellite navigation, can solve the problem of low accuracy of satellite position and velocity prediction, and achieve the effect of comprehensive GLONASS almanac parameters, simple fitting formula and high prediction accuracy

Inactive Publication Date: 2017-07-18
TSINGHUA UNIV
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Problems solved by technology

However, the existing GLONASS (Global Navigation Satellite System, global satellite navigation system) almanac parameter estimation method does not consider the influence of the semi-major axis change rate of the satellite orbit on the satellite orbit, resulting in low prediction accuracy of the almanac estimation parameters for the satellite position and velocity

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  • GLONASS almanac parameter estimation method used for satellite navigation
  • GLONASS almanac parameter estimation method used for satellite navigation
  • GLONASS almanac parameter estimation method used for satellite navigation

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Embodiment Construction

[0038] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0039] The invention provides a method for estimating GLONASS almanac parameters used in satellite navigation. According to the satellite orbit data of a certain arc segment (generally referring to the valid period of GLONASS almanac parameters), a group of six satellite orbits based on the method of least squares estimation is used for fitting. Then, according to the physical meaning of the satellite orbit parameters and the definition of the GLONASS almanac parameters, the satellite motion state information of the GLONASS satellite at the time when the GLONASS satellite crosses the ascending node from south to north is calculated from the group of estimated orbit parameters (represented by the orbital element number ).

[0040] Specific steps include:

[0041] Step 1, establish the GLONASS almanac parameter fitting algorithm model, the state equation an...

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Abstract

The invention discloses a GLONASS almanac parameter estimation method used for satellite navigation. Rapid fitting generating of high precision GLONASS almanac parameters is realized, and then the rapid accurate determining of the satellite position and the satellite speed of the satellite navigation is realized, and therefore a basis is provided for the navigation. The invention provides a method of estimating the rate of change of a satellite operation period in the GLONASS almanac parameters, and the estimated almanac parameters are more comprehensive, and a fitting formula is simple. During the fitting generating of the GLONASS almanac parameters, influences of changes of a semi-major axis of a satellite orbit under a condition of a disturbing force are considered, and the precision of the forecasting of the satellite position and the satellite speed is higher.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a GLONASS almanac parameter estimation method for satellite navigation. Background technique [0002] The almanac parameter is an important part of the navigation message of the satellite navigation system, and it plays a very important role in the signal acquisition process of the navigation receiver. In the absence of auxiliary information, the receiver estimates the approximate position and velocity of the satellite based on the almanac parameters, reproduces the visible satellite and searches for it, and avoids searching for satellites in the sky. At the same time, the approximate Doppler frequency shift of the satellite relative to the receiver is estimated according to the satellite speed, which can assist in the frequency domain search signal during the signal acquisition stage, greatly shortening the satellite signal acquisition time, thereby shortening the f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/27
CPCG01S19/27
Inventor 谢小刚陆明泉
Owner TSINGHUA UNIV