北斗卫星B2信号数字预失真补偿方法研究

doi:10.12305/j.issn.1001-506X.2024.11.25

Abstract

Abstract:

Aiming at the navigation signal nonlinear distortion problem caused by the high amplifier and filter of the signal transmitting channel to the BeiDou satellite, a digital pre-distortion with indirect learning structure to compensate for the nonlinear distortion generated by the navigation signal is proposed. The effectiveness and feasibility of digital pre-distortion in compensating the nonlinear distortion of navigation signals is verified by using the BeiDou B2 signal modulated by asymmetric constant envelope binary offset carrier (ACE-BOC) with the largest bandwidth, and the signals before and after digital pre-distortion processing are compared and analyzed from several aspects, such as modulation constellations, power spectra, correlation functions, and S-curve bias. Experiment results show that the digital pre-distortion can effectively suppress the out-of-band power loss of 20 dB, the correlation loss can be reduced from 0.7 dB to 0.009 dB and the S-curve bias can be reduced from 0.88 ns to 0.002 9 ns. The proposed digital predistortion model can effectively improve the nonlinear distortion caused by the signal transmission channel.

Key words: BeiDou satellite navigation system, B2 signal, high power amplifiers, digital pre-distortion, signal quality measurement

CLC Number:

TN911.6

Rui LIU, Chengyan HE, Xiaozhen ZHANG, Yan BAI. Research on digital pre-distortion compensation method of BDS B2 signal[J]. Systems Engineering and Electronics, 2024, 46(11): 3827-3834.

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B2	载波频率/MHz	调制方式	带宽/MHz	分量	符号速率/sps	相位关系/(°)	功率比
B2a	1 176.45	QPSK (10)	20.46	B2a_I	200	0	5
B2a	1 176.45	QPSK (10)	20.46	B2a_Q	0	90	5
B2b	1 207.14	QPSK (10)	20.46	B2b_I	-	1 000	0
B2b	1 207.14	QPSK (10)	20.46	B2b_Q	—	90	4

Research on digital pre-distortion compensation method of BDS B2 signal

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