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

系统工程与电子技术 ›› 2024, Vol. 46 ›› Issue (11): 3827-3834.doi: 10.12305/j.issn.1001-506X.2024.11.25

北斗卫星B2信号数字预失真补偿方法研究

刘瑞¹^,², 贺成艳³^,*, 张小贞¹, 白燕¹^,²

1. 中国科学院国家授时中心, 陕西西安 710600
2. 中国科学院大学天文与空间科学学院, 北京 101408
3. 西北工业大学电子信息学院, 陕西西安 710129

收稿日期:2023-07-27 出版日期:2024-10-28 发布日期:2024-11-30
通讯作者: 贺成艳
作者简介:刘瑞 (1998—), 男, 硕士研究生, 主要研究方向为导航信号优化、信号质量评估
贺成艳 (1986—), 女, 教授, 硕士研究生导师, 博士, 主要研究方向为卫星导航信号处理、信号质量评估
张小贞 (1989—), 女, 助理研究员, 博士, 主要研究方向为卫星激光测距技术、导航信号处理
白燕 (1975—), 女, 研究员, 硕士研究生导师, 博士, 主要研究方向为星间链路技术、高精度时间传递
基金资助:
国家自然科学基金(12273046)

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

Rui LIU¹^,², Chengyan HE³^,*, Xiaozhen ZHANG¹, Yan BAI¹^,²

1. National Time Service Center, Chinese Academy of Sciences, Xi' an 710600, China
2. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, China
3. School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710129, China

Received:2023-07-27 Online:2024-10-28 Published:2024-11-30
Contact: Chengyan HE

摘要/Abstract

摘要：

针对北斗星上信号发射通道中高功放和滤波器引起的导航信号非线性失真问题, 提出间接学习结构的数字预失真用以补偿导航信号产生的非线性失真。通过采用带宽最大的非对称恒包络二进制偏移载波(asymmetric constant envelope binary offset carrier, ACE-BOC)调制的北斗B2信号, 验证数字预失真对补偿导航信号非线性失真的有效性及可行性, 并从调制星座、功率谱、相关函数、S曲线过零点偏差等信号评估指标对数字预失真处理前后的信号进行对比分析。实验结果表明, 数字预失真可以有效抑制20 dB的带外功率损失, 相关损失可由0.7 dB下降到0.009 dB以及S曲线过零点偏差由0.88 ns下降到0.002 9 ns。本文所提的数字预失真模型可有效改善信号发射通道引起的信号非线性失真。

关键词: 北斗卫星导航系统, B2信号, 高功率放大器, 数字预失真, 信号质量评估

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

中图分类号:

TN911.6

刘瑞, 贺成艳, 张小贞, 白燕. 北斗卫星B2信号数字预失真补偿方法研究[J]. 系统工程与电子技术, 2024, 46(11): 3827-3834.

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

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[2]	谢非，刘建业，李荣冰，徐昭. 北斗QPSK调制信号多星联合捕获算法[J]. 系统工程与电子技术, 2014, 36(8): 1595-1601.
[3]	吴晓芳，石江宏，陈辉煌，邓振淼. 基于正交模型辨识辅助的欠采样数字预失真方法[J]. Journal of Systems Engineering and Electronics, 2012, 34(2): 369-374.

北斗卫星B2信号数字预失真补偿方法研究

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

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