LTE外辐射源雷达帧间模糊带分析与抑制

王本静; 易建新; 万显荣; 但阳鹏

doi:10.12000/JR18025

LTE外辐射源雷达帧间模糊带分析与抑制

DOI: 10.12000/JR18025

武汉大学电子信息学院武汉 430072

基金项目: 国家重点研发计划（2016YFB0502403），博士后创新人才支持计划（BX201600117），国家自然科学基金（61701350，61331012），湖北省科技支撑项目（2015BCE075），湖北省自然科学基金（2016CFA061）

详细信息

作者简介:
王本静(1991–)，女，河南信阳人，武汉大学电子信息学院在读硕士研究生，主要研究方向为外辐射源雷达信号处理。E-mail: benjingw@whu.edu.cn

易建新(1989–)，男，湖南永州人，武汉大学博士，研究方向为外辐射源雷达信号处理、目标跟踪和信息融合。E-mail: jxyi@whu.edu.cn

万显荣(1975–)，男，湖北天门人，武汉大学博士，教授，博士生导师，研究方向为新体制雷达设计，如外辐射源雷达、高频雷达系统及信号处理。E-mail: xrwan@whu.edu.cn

但阳鹏(1993–)，男，湖北仙桃人，武汉大学电子信息学院在读博士研究生，研究方向为外辐射源雷达信号处理。E-mail: ypd@whu.edu.cn

通讯作者:
易建新 jxyi@whu.edu.cn

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出版历程
- 收稿日期: 2018-03-23
- 修回日期: 2018-05-21
- 网络出版日期: 2018-08-28

Inter-frame Ambiguity Analysis and Suppression of LTE Signal for Passive Radar

School of Electronic Information, Wuhan University, Wuhan 430072, China

Funds: National Key Research and Development Program (2016YFB0502403), Postdoctoral Innovative Talent Support Program (BX201600117), The National Natural Science Foundation of China (61701350, 61331012), Science and Technology Support Project of Hubei Province (2015BCE075), The Natural Science Foundation of Hubei Province (2016CFA061)

摘要

摘要: LTE (Long Term Evolution)信号具有大带宽、高覆盖率、强通用性等优点，是一种新型的外辐射源雷达机会照射源。该文从FDD-LTE (Frequency Division Duplexing Long Term Evolution)信号结构入手，探讨了该信号作为第三方机会照射源的模糊函数特性；根据实测FDD-LTE信号，阐述了模糊函数中帧间模糊带抑制的必要性，并对该帧间模糊带的形成机理进行了详细的分析，分析结果表明LTE信号结构中的确定性特征既是引起模糊带的主要因素，同时也是信号相干积累的主要能量来源。对此，该文提出了基于OFDM (Orthogonal Frequency Division Multiplexing)符号子载波系数归一化的帧间模糊带抑制方法，该方法能够在抑制帧间模糊带的同时，又不影响信号相干积累进行目标探测。仿真和实测结果验证了该抑制方法的有效性，为LTE外辐射源雷达目标探测奠定了基础。
- 外辐射源雷达 /
- LTE /
- 模糊函数 /
- OFDM /
- 帧间模糊
Abstract: Long Term Evolution (LTE) is a new type of illuminators of opportunity for passive radars, with the advantages of broad bandwidth, high coverage, and strong generality. In this paper, the ambiguity function of Frequency Division Duplexing Long Term Evolution (FDD-LTE) signal is analyzed as an illuminator of opportunity. According to the measured signal, it was found that it is necessary to suppress the inter-frame ambiguity strips in the ambiguity function. Furthermore, themechanism of these inter-frame ambiguity strips was analyzed in detail, which revealed that the LTE signal frame structure is the main factor that causes these inter-frame ambiguity strips and is the major energy source of coherent integration. Thus, a method based on Orthogonal Frequency Division Multiplexing (OFDM) symbol subcarrier coefficient normalization is proposed to suppress these inter-frame ambiguity strips. Simulation and experimental results show that the method can suppress inter-frame ambiguity strips effectively, but does not affect coherent integration, which is the foundation of target detection.
- Passive radar /
- LTE /
- Ambiguity function /
- Orthogonal Frequency Division Multiplexing (OFDM) /
- Inter-frame ambiguity

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图 1 FDD-LTE信号帧结构

Figure 1. FDD-LTE signal frame structure

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图 2 FDD-LTE下行资源栅格

Figure 2. FDD-LTE downlink resource grid

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图 3 实测FDD-LTE下行信号时频资源图

Figure 3. Time-frequency resource map of the measured FDD-LTE downlink signal

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图 4 实测FDD-LTE信号模糊函数

Figure 4. AF of the measured FDD-LTE signal

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图 5 FDD-LTE信号帧间模糊抑制前后的模糊函数

Figure 5. AF of the FDD-LTE signal before and after suppressing the inter-frame ambiguity

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图 6 仿真FDD-LTE信号帧间模糊抑制前后RD谱

Figure 6. RD spectra of the FDD-LTE simulated signal before and after suppressing the inter-frame ambiguity

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表 1 FDD-LTE信号模糊函数典型副峰

Table 1. Typical ambiguity peaks in the AF of the FDD-LTE signal

	副峰位置	产生原因
帧内模糊	66.67 μs	循环前缀
	11.11 μs整数倍	CRS
	1 kHz整数倍	控制区域信号
	2 kHz整数倍	CRS
帧间模糊	10 ms	CRS及同步信号

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表 2 下行物理信道及物理信号的调制方式

Table 2. Modulation modes of the downlink physical channels and physical signal

物理信道及物理信号	调制方式
CRS	QPSK
PCFICH	QPSK
PHICH	BPSK
PDCCH	QPSK

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表 3 FDD-LTE信号仿真参数

Table 3. Parameters used for the simulated FDD-LTE signal

参数	数值
采样率	23.04 MHz
带宽	15 MHz
子载波间隔	15 kHz
OFDM符号数据体长度	66.67 μs
循环前缀长度	4.69/5.12 μs
无线帧数	50
信噪比	25 dB
PCI	0
控制格式指示信息CFI	1
PHICH组内用户数量	3

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表 4 多径和目标仿真参数

Table 4. Parameters used for the simulated the multipath and target

	多径杂波	目标
距离元	[0, 1, 2, 5, 9]	30
多普勒频率(Hz)	[0, 0, 0, 0, 0]	100
信噪比(dB)	[25, 20, 15, 10, 5]	–20

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