Low earth orbit satellite doppler estimation demodulation method and apparatus

CN116471155BActive Publication Date: 2026-06-26THE 54TH RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-26
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In low-Earth orbit satellite communications, existing technologies, such as traditional high-dynamic demodulators, cannot extract the carrier quickly and accurately, resulting in low signal acquisition and demodulation efficiency. In particular, in the demodulation of short burst signals, there are problems such as wasted transmitter power or slow carrier locking speed.

Method used

The beacon is locked using a phase detection method, the Doppler frequency shift is quickly extracted using a Doppler estimation module, and the frequency conversion is performed using the ratio of the beacon frequency to the signal carrier frequency. Combined with timing recovery, carrier recovery, demapping and decoding, high-precision Doppler estimation and demodulation are achieved.

Benefits of technology

It achieves fast and accurate Doppler estimation and demodulation under high dynamic conditions of low-Earth orbit satellites, adapts to the needs of different communication systems, reduces transmitter power consumption, and improves signal acquisition efficiency.

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Abstract

The application discloses a low-orbit satellite Doppler estimation demodulation method and equipment. It relates to high dynamic synchronization technology and is suitable for application in low-orbit satellite communication. The application takes a satellite beacon as a pilot signal, quickly locks the satellite beacon through a phase discrimination method, and extracts a current Doppler frequency shift; then, according to the beacon frequency and the carrier frequency of the symbol rate of the received signal, the Doppler frequency shift of the received signal is determined; finally, through frequency down-conversion, the low symbol rate signal is converted into a baseband signal, and then timing recovery, carrier recovery, demapping and the like are carried out, so as to complete demodulation. The application is suitable for high dynamic conditions of low-orbit satellites, has a large Doppler estimation range and high precision.
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Citation Information

Patent Citations

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  • High-speed demodulation method, device and equipment suitable for low-orbit satellite

    CN115296721A