机载GNSS海洋反射信号的建模与仿真

祁永强; 张波; 杨东凯; 李博闻; 彭博

doi:10.13700/j.bh.1001-5965.2016.0242

机载GNSS海洋反射信号的建模与仿真

doi: 10.13700/j.bh.1001-5965.2016.0242

北京航空航天大学电子信息工程学院, 北京 100083

基金项目:

国家自然科学基金 61171070

详细信息

作者简介:
祁永强, 男, 博士研究生。主要研究方向:GNSS-R理论与应用

张波, 男, 博士, 讲师, 硕士生导师。主要研究方向:扩频通信、卫星导航及其应用等

杨东凯, 男, 博士, 教授, 博士生导师。主要研究方向:卫星导航信号处理及应用技术、无线数据传输等

李博闻, 男, 硕士研究生。主要研究方向:GNSS-R理论与应用

彭博, 男, 硕士研究生。主要研究方向:卫星导航信号模拟器理论与实现

通讯作者:
杨东凯, E-mail:yangdongkai@sina.com

中图分类号: TN967.1
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出版历程
- 收稿日期: 2016-03-29
- 录用日期: 2016-05-13
- 网络出版日期: 2017-03-20

Modeling and simulation of airborne GNSS ocean reflection signal

School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:

National Natural Science Foundation of China 61171070

More Information

Corresponding author: YANG Dongkai, E-mail:yangdongkai@sina.com

摘要

摘要:
由于全球导航卫星系统反射（GNSS-R）机载试验耗费大和重复性差，需研制GNSS-R信号模拟器，但没有相应的反射信号模型。提出了一种基于数据拟合的机载GNSS海洋反射信号建模方法。首先，对复杂的GNSS海面反射信号进行近似简化。然后利用ZV模型生成的时延相关功率曲线，通过最小二乘拟合和非线性拟合，建立了多条等时延间隔的海洋反射信号功率衰减模型，从而得到机载GNSS海洋反射信号的时延、功率、多普勒频率参数。最后，对多条反射信号的合路信号进行相关的仿真验证。验证的结果表明模拟的14条反射信号的相关功率曲线与ZV模型理论曲线的相关系数优于0.99，能够有效地用于GNSS海洋反射信号的生成。该方法可根据海面风场、浪高、波高等海面信息，模拟不同海况的海洋反射信号，为GNSS-R信号模拟器的研制奠定基础。
- 全球导航卫星系统 (GNSS) /
- 反射信号 /
- ZV模型 /
- 数据拟合 /
- 海洋遥感
Abstract:
Due to the large consumption and poor repeatability of global navigation satellite system-reflection (GNSS-R) airborne experiment, it is needed to develop GNSS-R signal simulator. But there is no corresponding signal model. In this paper, a modeling method for airborne GNSS ocean reflection signal, based on data fitting, is proposed. First, the complex GNSS sea surface reflection signal was simplified. Then, the time delay correlation power curve generated by the ZV model was used. The power attenuation model of the ocean reflection signal is established by the nonlinear iterative fitting and the least square fitting. With the method, the time delay, power and Doppler frequency parameters of the airborne GNSS ocean reflection signal could be obtained. Finally, the simulation verification of the multiple combined signals was conducted. The simulation results indicate that the correlation coefficient of the 14 signal correlation power curve and the theoretical curve of the ZV model is better than 0.99, which can be used to generate the GNSS ocean reflection signal effectively. The method simulates the different ocean reflected signals according to the sea surface information such as the sea surface wind field, wave height and wave height, which may lay the foundation for the development of GNSS-R signal simulator.
- global navigation satellite system (GNSS) /
- reflection signal /
- ZV model /
- data fitting /
- ocean remote sensing

HTML全文

图 1 海洋反射信号示意图

Figure 1. Schematic diagram of ocean reflection signal

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图 2 海洋反射信号模拟的大致流程

Figure 2. General procedure of ocean reflection signal simulation

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图 3 等时延信号相关结果示意图

Figure 3. Schematic diagram of correlation result of equal delay signals

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图 4 海面反射信号相关函数波形

Figure 4. Correlation function waveform of sea surface reflection signal

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图 5 反射信号处理结构

Figure 5. Reflection signal processing structure

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图 6 时延一维相关功率曲线

Figure 6. Curve of delay one-dimensional correlation power

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图 7 最小二乘数据拟合的比较

Figure 7. Comparison of least square data fitting

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图 8 第2次数据拟合的比较

Figure 8. Comparison of the second data fitting

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图 9 反射信号处理结果

Figure 9. Results of reflection signal processing

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表 1 16路反射信号的主要参数

Table 1. Main parameters of 16 reflection signals

信号序数	时延/码片	多普勒频率/Hz	功率/dBW
1	29.56	-273	-170.45
2	29.56+0.25	-273	-174.42
3	29.56+0.50	-273	-178.23
4	29.56+0.75	-273	-181.84
5	29.56+1.00	-273	-185.13
6	29.56+1.25	-273	-188.05
7	29.56+1.50	-273	-190.51
8	29.56+1.75	-273	-192.44
9	29.56+2.00	-273	-193.94
10	29.56+2.25	-273	-195.04
11	29.56+2.50	-273	-195.76
12	29.56+2.75	-273	-196.29
13	29.56+3.00	-273	-196.70
14	29.56+3.25	-273	-196.99
15	29.56+3.50	-273	-197.14
16	29.56+3.75	-273	-197.29

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参考文献(17)

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