Research Article
A Fast Acquisition Algorithm Based on High Sampling Rate FFT for LEO Satellite Signals
@INPROCEEDINGS{10.1007/978-3-030-93398-2_2, author={Deyang Kong and Zhisong Hao and Yongfei Hou}, title={A Fast Acquisition Algorithm Based on High Sampling Rate FFT for LEO Satellite Signals}, proceedings={Wireless and Satellite Systems. 12th EAI International Conference, WiSATS 2021, Virtual Event, China, July 31 -- August 2, 2021, Proceedings}, proceedings_a={WISATS}, year={2022}, month={1}, keywords={LEO satellite communication Fast signal acquisition Frequency offset estimation}, doi={10.1007/978-3-030-93398-2_2} }- Deyang Kong
Zhisong Hao
Yongfei Hou
Year: 2022
A Fast Acquisition Algorithm Based on High Sampling Rate FFT for LEO Satellite Signals
WISATS
Springer
DOI: 10.1007/978-3-030-93398-2_2
Abstract
In the communication of LEO satellite system, there is a high relative velocity and acceleration between the receiver and the transmitter due to the high-speed motion of the platform. This leads to doppler frequency offset in the communication link. In large frequency offset and high dynamic communication environment, signal frame capture is the key technology to realize signal demodulation and link establishment. The acquisition bandwidth of low symbol rate signal is very small, which leads to the long acquisition time of frequency sweeping method. In this paper, the fast acquisition problem of low-speed FDMA signal with large frequency offset and high dynamic is solved by using high sampling rate partially matched filter FFT algorithm. The algorithm can realize the frequency estimation and fast acquisition of the signal when the frequency offset is 4 times the symbol rate. Compared with the traditional method, the algorithm greatly improves the acquisition bandwidth and speed.
