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Satellite position and speed forecasting method based on GLONASS almanac parameters

A satellite position and parameter technology, applied in the field of satellite position and velocity prediction based on GLONASS almanac parameters, can solve problems such as complex expressions and many calculation steps

Inactive Publication Date: 2017-10-10
TSINGHUA UNIV
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Problems solved by technology

The existing GLONASS almanac parameter user algorithm uses an analytical model method based on the average number of satellite orbits, which has complex expressions and many calculation steps

Method used

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  • Satellite position and speed forecasting method based on GLONASS almanac parameters
  • Satellite position and speed forecasting method based on GLONASS almanac parameters
  • Satellite position and speed forecasting method based on GLONASS almanac parameters

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Embodiment Construction

[0044] Examples are given below to describe the present invention in detail.

[0045] Based on the special definition of GLONASS almanac parameters, the present invention improves the existing classical GPS user algorithm model in a targeted manner, and provides a satellite position and speed prediction method based on GLONASS almanac parameters, based on the principle of satellite orbit dynamics and satellite position The method of expressing the orbital elements of the velocity, according to the GLONASS almanac parameters (as shown in Table 1), calculate the orbital parameters such as the average angular velocity, the semi-major axis, the deviating anomaly angle, the mean anomaly angle, and the right ascension of the ascending node and their changes at the observation time Rate, and then obtain the latitude angle, latitude angle change rate, radial vector and radial vector change rate at the observation time, from which the position and speed of the satellite in the orbital c...

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Abstract

The invention discloses a satellite position and speed forecasting method based on GLONASS almanac parameters. The method of the invention utilizes the GLONASS almanac parameters to estimate the satellite position and the speed at a quick pace and with small computation amount. According to the invention, based on the satellite orbit kinetic principle and the orbital element representing method for the satellite position and speed and according to the GLONASS almanac parameters, the orbital parameters and their changing rates at the observation period such as the average angular velocity, the semi-major axis, the eccentric anomaly, the mean anomaly, and the ascending node right ascension can be worked out so as to seek the latitude amplitude, the latitude amplitude changing rate, the radial vector and the radial vector changing rate. In this manner, the position and the speed of the satellite in the orbital coordinate system can be worked out; and according to the coordinate conversion formula, the position and the speed of the satellite in the PZ-90 coordinate system can be worked out finally.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a satellite position and speed prediction method based on GLONASS almanac parameters. 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, avoiding 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 shor...

Claims

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Application Information

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IPC IPC(8): G01S19/08
Inventor 谢小刚陆明泉
Owner TSINGHUA UNIV
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