GNSS (Global Navigation Satellite System)-based signal aided time frequency difference comprehensive correction method

A time-frequency difference and frequency difference technology, applied in the field of time-frequency difference comprehensive correction based on GNSS signal assistance

Inactive Publication Date: 2013-06-12
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0003] Aiming at the current problem of how to improve the accuracy of low-orbit dual-star passive positioning, the present invention proposes a comprehensive correction method of time-frequency difference based on GNSS signals

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  • GNSS (Global Navigation Satellite System)-based signal aided time frequency difference comprehensive correction method
  • GNSS (Global Navigation Satellite System)-based signal aided time frequency difference comprehensive correction method
  • GNSS (Global Navigation Satellite System)-based signal aided time frequency difference comprehensive correction method

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] see figure 1 as shown, and Represents two low-orbit satellites, GEO satellite signals are sent to the two low-orbit satellites through two links and , after receiving the time difference of arrival and frequency difference of arrival of GEO satellite signals, the spaceborne receiver on the low-orbit satellite calculates the time The amount of frequency difference correction and the comprehensive correction of the time-of-arrival frequency difference on the satellite. The comprehensively corrected time-frequency difference of arrival can be directly used to calculate the position of the radiation source on the satellite.

[0050] Among the two low-orbit satellites, the on-board processing system of the first low-orbit satellite has an arrival time-frequency difference measurement unit and a time-frequency difference comprehensive correcti...

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Abstract

The invention discloses a GNSS (Global Navigation Satellite System)-based signal aided time frequency difference comprehensive correction method, which specifically comprises the following steps of: (1) calculating orbit coordinates and movement velocity of two low earth orbit satellites in current epoch, respective distances from the two low earth orbit satellites to the GEO satellite and the distance between the two earth orbit satellites by using position coordinates of a low earth orbit satellite on-board navigation receiver and a GEO (Geostationary Orbit) satellite; and (2) calculating correction quantity of time difference of arrival and correction quantity of frequency difference of arrival of the low earth orbit satellites according to the GEO satellite coordinates and the calculated orbit coordinates and the velocity parameter of the two low earth orbit satellites in the current epoch, and correcting the time difference of arrival and the frequency difference of arrival before correction of a radiation source obtained by the low earth orbit navigation receiver according to the correction quantities to obtain the corrected time difference of arrival and frequency difference of arrival. By using the method, the fixed deviation of the time difference of arrival of the radiation source can be excellently corrected, so that the positioning accuracy of the radiation source of a space passive positioning system is obviously improved.

Description

technical field [0001] The invention relates to the field of satellite positioning, in particular to a comprehensive correction method of time-frequency difference based on GNSS signal assistance. Background technique [0002] The precise positioning of radiation sources by satellites is of great significance in the fields of space information countermeasures and satellite communications. Scholars at home and abroad have carried out a lot of related research on the low-orbit dual-star passive positioning system. At present, low-orbit dual satellite passive positioning mainly adopts the joint positioning method of TDOA (Time difference of Arrival, TDOA) and FDOA (Frequency difference of Arrival, FDOA), but due to the relative clock error and the transponder Influenced by factors such as delay and fixed frequency deviation, the positioning accuracy can generally only reach 3-10 kilometers. Numerous research results have shown that the error of time-frequency difference of ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/07
Inventor 蔡成林喻思琪李思敏邓克群韦照川王利杰李志斌席超
Owner GUILIN UNIV OF ELECTRONIC TECH
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