Carrier frequency synchronization method suitable for millimeter wave inter-satellite link

Abstract

The invention discloses a carrier frequency synchronization method suitable for a millimeter wave inter-satellite link, and belongs to the field of inter-satellite communication systems. The method includes firstly, constructing a millimeter wave inter-satellite link communication scene, and any two satellites transmitting information through an inter-satellite link; next, launching the satellitefor the current time, the high-frequency wireless frame reaching a receiving end of another satellite through a millimeter wave inter-satellite link, obtaining a digital signal with carrier frequencyoffset after sampling, extracting an STF sequence rstf [n] of the current wireless frame, demodulating the sequence rstf [n] , extracting a phase difference, and obtaining a coarse frequency offset estimated value of the current wireless frame; and finally, carrying out fine estimation on the frequency offset estimation value again and compensating to the current wireless frame to realize carrierfrequency synchronization of the current frame; and sequentially selecting a next wireless frame, repeatedly extracting the STF sequence rstf [n], carrying out coarse estimation and fine estimation offrequency offset, and compensating a final estimation value to each frame, thereby realizing carrier frequency synchronization of each frame. According to the method, a more stable and accurate frequency offset estimation value can be obtained, so that the system performance is effectively improved.

Description

technical field [0001] The invention belongs to the field of inter-satellite communication systems, and relates to the problem of carrier frequency synchronization at a receiving end, in particular to a carrier frequency synchronization method suitable for millimeter-wave inter-satellite links. Background technique [0002] The available bandwidth of the mmWave communication system is large, so it can support high-speed data rate transmission. However, long-distance and high-capacity mmWave communication needs to ensure accurate signal capture and demodulation. Carrier synchronization is one of the key technologies in receiver digital communication modems. [0003] In the inter-satellite communication network, the inter-satellite link is an important channel for information transmission. However, due to the high-speed relative motion between the satellites, the high-speed relative motion of the satellites produces a serious Doppler frequency shift, so that there is a carri...

AI Technical Summary

Problems solved by technology

However, due to the high-speed relative motion between the satellites, the high-speed relative motion of the satellites produces a serious Doppler frequency shift, so that there is a carrier frequency deviation with a high dynamic range in the receiver signal. This deviation is relative to the carrier deviation of the ground communication system. Very large, it has a great impact on data reception, demodulation, and judgment. If this deviation cannot be offset, it will have a great impact on communica

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