Method for calculating doppler rate of change in a low earth orbit satellite communication system

By utilizing the cyclic prefix domain and data domain of OFDM symbols in low-Earth orbit satellite communication systems to perform relevant calculations, the problem of rapid changes in Doppler rate of change was solved, achieving high-precision Doppler rate of change estimation without relying on ephemeris information. This simplifies the calculation process and improves the stability and quality of the communication system.

CN119766612BActive Publication Date: 2025-10-24CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Application Number
CN202411723988.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-10-24
Estimated Expiration
2044-11-28

AI Technical Summary

Technical Problem

The rapid changes in Doppler frequency shift and Doppler rate of change in low-Earth orbit satellite communication systems place higher demands on signal synchronization, tracking, and compensation. Existing technologies are unable to accurately estimate and compensate for these changes, leading to a decline in communication quality.

Method used

At the receiving end, correlation calculations are performed using the cyclic prefix domain and data domain of the OFDM symbol. By calculating the phase offset and Doppler rate of change, the Doppler rate of change is estimated using a method that does not require system messages, simplifying the computational complexity. Only the time domain signal is needed for the calculation.

Benefits of technology

It realizes the calculation of Doppler rate of change in low-Earth orbit satellite communication systems without relying on ephemeris information, reduces computational complexity, improves estimation accuracy, adapts to rapid changes in Doppler rate of change, and ensures communication quality.

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Abstract

The application relates to a Doppler rate calculation method in a low-orbit satellite communication system and belongs to the field of mobile communication. In view of a low-orbit satellite communication system of a non-ground communication network (NTN), the application aims to solve the problem of Doppler rate calculation without ephemeris information and frequency and timing precision synchronization conditions. By utilizing the OFDM data frame structure features, the cyclic prefix data and the symbol tail data of the OFDM symbol are extracted, the phase offset is obtained through correlation calculation, the Doppler rate is calculated in combination with the OFDM symbol interval time, and the calculation precision is improved through multiple averaging. The application does not need to analyze the data frame content, has low calculation complexity, is convenient for engineering implementation, is suitable for estimation and compensation of the Doppler frequency shift rate in the low-orbit satellite communication, and effectively improves the communication system performance.
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