VHF雷达回波距离拓展特性频率依赖关系研究

李统乐; 李海英; 徐彬; 张雅彬; 刘瑶

doi:10.12265/j.cjors.2021056

VHF雷达回波距离拓展特性频率依赖关系研究

doi: 10.12265/j.cjors.2021056

李统乐^1,,
李海英^1,,
徐彬^2, ,,
张雅彬^2,,
刘瑶²

1.
西安电子科技大学，西安 710071
2.
中国电波传播研究所电波环境特性及模化技术重点实验室，青岛 266107

基金项目: 稳定支持经费项目（A132001W12，A131901W14）；国家自然科学基金（61801349，61875156，62071359）；陕西省自然科学基础研究计划（2020JM-192）

详细信息

作者简介:
李统乐：(1997—)，男，山东人，西安电子科技大学物理与光电工程学院在读硕士，研究方向为相干散射雷达回波特性分析

李海英：(1982—)，女，山东人，西安电子科技大学物理与光电工程学院副教授，博士，研究方向为涡旋电磁波在复杂环境中的传播特性、电离层加热的实验和理论研究、电磁波在复杂粒子体系中散射特性

徐彬：(1982—)，男，辽宁人，中国电波传播研究所研究员，博士，研究方向为电波传播与空间等离子体探测

通讯作者:
徐彬 E-mail：jasur1982@163.com

中图分类号: TN957.51
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-11
- 网络出版日期: 2021-07-15

Research on frequency dependence of range extension in VHF radar echo

LI Tongle^1
,,
LI Haiying^1
,,
XU Bin^{2
, ,},
ZHANG Yabin^2
,,
LIU Yao²

1.
Xidian University, Xi’an 710071, China
2.
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China

摘要

摘要: 针对相干散射雷达探测中受方向敏感性的影响产生距离拓展的现象，研究了在不规则体尺度参数影响下回波距离拓展特性与雷达频率之间的依赖关系. 基于相干散射雷达回波方程，对回波展宽随不规则体尺度变化进行了计算，开展了雷达工作频率与距离拓展特性依赖关系的仿真，得到了雷达工作频率-展宽宽度拟合斜率随不规则体尺度变化规律. 结果表明，回波展宽宽度与雷达频率之间为线性相关，拟合斜率与不规则体纵向尺度之间存在一一对应的关系，通过线性回归计算的斜率可以用于反推不规则体的纵向尺度参数. 由于斜率计算无需获取绝对的雷达天线增益、馈线损耗和发射功率等参数，因此可为未标定的 VHF雷达提供一种新的不规则体尺度探测方法，这对开发新的不规则体探测技术具有重要意义.
- 电离层 /
- 不规则体 /
- VHF相干散射雷达 /
- 距离拓展特性 /
- 尺度参数
Abstract: According to facts that the range extension of the echo due to the influence of the aspect sensitivity in the detection of coherent scattering radar, this paper studies the dependence of the echo range extension and radar frequency are affected by the scales of the irregularities. Based on the coherent scattering radar echo equation, the echo broadening with the scales of the irregularities is calculated, and the simulation of the dependence of the radar operating frequency and the range extension is carried out, the variation of the fitting slope of the radar operating frequency and the broadening width with the scales of the irregularities is obtained. The results show that there is a linear correlation between the echo broadening width and the radar frequency, and there is the only correspondence between the fitting slope and the longitudinal scale of the irregularities. The slope calculated by linear regression can be used to reverse the scale of the irregularities. Since the calculation of slope does not require the acquisition of absolute radar antenna gain, feeder loss and transmission power, it can provide a new scale detection method of the irregularities for non-calibration VHF radar. The result is of significance for the development of new detection techniques for the irregularities.
- ionosphere /
- irregularities /
- VHF coherent scattering radar /
- range extension characteristic /
- scale parameters

HTML全文

图 1 VHF相干散射原理图

Fig. 1 VHF coherent scattering schematic diagram

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图 2 薄层不规则体的回波距离拓展

Fig. 2 The range extension of thin irregularities

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图 3 不规则体沿场散射距离拓展示意图

Fig. 3 Diagram of range extension of irregularities along the geomagnetic field

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图 4 回波功率随纵向尺度变化

Fig. 4 Echo power variation with longitudinal scales

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图 5 回波功率随横向尺度变化

Fig. 5 Echo power variations with transverse scales

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图 6 回波功率随雷达频率变化

Fig. 6 Echo power varies with radar frequency

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图 7 纵向尺度参数的拟合斜率特征

Fig. 7 Slope characteristics of longitudinal scale parameters

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图 8 拟合斜率与不规则体纵向尺度关系

Fig. 8 The relationship between the slope of the fit and longitudinal scales

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