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Geo system satellite-ground frequency difference calibration method and system using gbbf technology

A technology, frequency difference technology, applied in GEO system satellite-ground frequency difference calibration and system field using GBBF technology, can solve problems such as medium Doppler frequency deviation, reduce satellite complexity, ensure reliable operation, improve Effect of Calibration Accuracy

Active Publication Date: 2021-11-16
XIAN INSTITUE OF SPACE RADIO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The methods used in Document 2, Document 3, and Document 4 are used to calculate the motion Doppler frequency deviation, and none of them consider the medium Doppler frequency deviation

Method used

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  • Geo system satellite-ground frequency difference calibration method and system using gbbf technology
  • Geo system satellite-ground frequency difference calibration method and system using gbbf technology
  • Geo system satellite-ground frequency difference calibration method and system using gbbf technology

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Embodiment Construction

[0064] Attached below image 3 And examples illustrate the present invention in detail.

[0065] A method for calibrating the satellite-ground frequency difference of a geostationary satellite communication system using GBBF technology is realized in the following manner:

[0066] 1) Send pilot signal on the ground The pilot signal is transmitted through space, and the pilot signal becomes a pilot signal after adding motion Doppler frequency offset and medium Doppler frequency offset during space transmission.

[0067] 2) The satellite receives the pilot signal It is forwarded by frequency conversion and looped back to the ground; when the satellite forwards the loopback pilot signal, it sends two pilot signals with different frequencies to the ground at the same time The above pilot signal becomes a loopback pilot signal after adding motion Doppler frequency offset and medium Doppler frequency offset during space transmission. and pilot signal

[0068] 3) The gro...

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Abstract

The invention provides a satellite-ground frequency difference calibration method and system of a geostationary satellite communication system using GBBF technology, 1) the ground sends a pilot signal 2) the satellite receives the pilot signal to convert and forward it, and loop it back to the ground; the satellite forwards When the pilot signal is looped back, two pilot signals with different frequencies are sent to the ground at the same time. 3) The ground receives the loopback pilot signal and the pilot signal to calculate the center frequency of the 3 pilot signals, and then calculates the satellite-ground motion Doppler. 4) The ground adjusts the intermediate frequency of the n feed signals to compensate for the frequency difference between the feeds caused by the feeds transmitted in space; 5) The ground adjusts n baseband or low intermediate frequency feed signals are up-converted into radio frequency feed source signals, and then combined to form one FDM signal, which is sent to the satellite; 6) One FDM signal is divided into multiple channels on the star; n feed sources The signal is down-converted to an intermediate frequency feed signal.

Description

technical field [0001] The invention relates to a method for calibrating the satellite-ground frequency difference of a geostationary satellite communication system using the GBBF technology, which can effectively calculate the satellite-ground frequency difference and perform compensation to ensure ground beam-forming performance. The invention relates to the core technology of the next-generation geostationary orbit mobile communication system, and can also provide high-precision real-time frequency estimation scheme reference for satellites such as navigation and radar, and has wide application and practical value. Background technique [0002] Such as figure 1 As shown, GBBF (Ground-Based Beamforming) technology is a core technology of the next-generation geostationary orbit mobile communication system. GBBF technology can greatly improve the flexibility of beamforming. After the satellite is in orbit, it can flexibly and quickly increase and eliminate And reconstruct s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04L27/00
CPCH04B7/18517H04L27/0014H04L2027/0026
Inventor 张宁秋研东楼大年张静宇
Owner XIAN INSTITUE OF SPACE RADIO TECH