基于相位条纹的高精度GPS码相位测量方法

傅圣友; 王兆瑞; 金声震; 艾国祥

doi:10.13700/j.bh.1001-5965.2018.0767

基于相位条纹的高精度GPS码相位测量方法

doi: 10.13700/j.bh.1001-5965.2018.0767

傅圣友^{1, 2},
王兆瑞^2, ,,
金声震²,
艾国祥²

1.
中国科学院大学天文与空间科学学院, 北京 100049
2.
中国科学院国家天文台, 北京 100101

基金项目:

国家重点研发计划 2016YFB0501900

国家自然科学基金 11603041

详细信息

作者简介:
傅圣友  男, 博士研究生。主要研究方向:卫星导航

王兆瑞  男, 博士, 副研究员。主要研究方向:卫星导航、非线性信号处理

金声震  男, 博士, 教授。主要研究方向:雷达信号处理

艾国祥  男, 院士, 教授, 博士生导师。主要研究方向:天体物理、卫星导航

通讯作者:
王兆瑞, E-mail: zhaorui_w@nao.cas.cn

中图分类号: P228.4;V249.3
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出版历程
- 收稿日期: 2018-12-26
- 录用日期: 2019-02-02
- 网络出版日期: 2019-09-20

High-precision GPS code phase measurement method based on phase stripe

1.
School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
2.
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China

Funds:

National Key R & D Program of China 2016YFB0501900

National Natural Science Foundation of China 11603041

More Information

Corresponding author: WANG Zhaorui, E-mail: zhaorui_w@nao.cas.cn

摘要

摘要:
GPS接收机在测量卫星到接收机的传播距离时，通常能得到码相位和载波相位2个基本测量值。虽然载波相位测量值比码相位测量值精度高，但存在整周模糊度的问题，在实际应用中比采用码相位的技术付出的代价高很多。因此，基于相位条纹技术，提出了一种高精度的码相位测量方法。在传统码跟踪环的基础上，通过提取互功率谱相位条纹的频率，得到高精度的码相位测量值，从而组装出高精度的码伪距。仿真实验结果表明：在信噪比为-15 dB的情况下，码相位测量误差均方差约0.37 m，优于传统延迟锁定环在相同条件下约1.82 m的跟踪精度。得到了比传统码跟踪环更高的码相位测量精度的同时，不需要解算载波相位的整周模糊度，对提高GPS定位精度具有研究意义和应用价值。
- GPS /
- 互相关 /
- 相位条纹 /
- 码相位 /
- 码跟踪环
Abstract:
When GPS receiver measures the propagation distance from satellites to the receiver, it can usually obtain two basic measurement values, code phase and carrier phase. Although the precision of carrier phase measurement is higher than that of code phase measurement, there exists the integer ambiguity problem, whose cost is much higher than that of using code phase technique in practical application. Therefore, based on the phase stripe technique, a high-precision code phase measurement method was proposed. On the basis of the traditional code tracking loop, the high-precision code phase measurement value is obtained by extracting the frequency of the phase stripes of the cross-correlation power spectrum, so as to assemble a high-precision code pseudo-range. Simulation results show that the precision of code phase measurement is about 0.37 m when the SNR is -15 dB, which is better than the tracking accuracy of 1.82 m under the same condition of traditional delay lock loop. At the same time of obtaining the higher-precision code phase measurements, the integer ambiguity of the carrier phase does not need to be solved, which has research significance and application value for improving the GPS positioning precision.
- GPS /
- cross-correlation /
- phase stripe /
- code phase /
- code tracking loop

HTML全文

图 1 延迟1 s的两路相同信号互功率谱相位条纹

Figure 1. Cross-correlation power spectrum phase stripes of two same signals with a delay of 1 s

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图 2 典型接收机码跟踪环路及相位条纹法结构

Figure 2. Structure of typical receiver code tracking loop and phase stripe method

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图 3 时域折叠法示意图

Figure 3. Schematic diagram of time domain folding method

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图 4 相位条纹法流程图

Figure 4. Flowchart of phase stripe method

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图 5 输入的中频信号

Figure 5. Input IF signal

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图 6 时域折叠后的信号

Figure 6. Folded signal in time domain

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图 7 接收信号与本地码信号的互功率谱相位条纹

Figure 7. Cross-correlation power spectrum phase stripes between received signal and local code signal

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图 8 条纹频率

Figure 8. Stripe frequency

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图 9 码相位测量误差均方差对比

Figure 9. RMSE of code phase measurement error comparison

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表 1 仿真参数

Table 1. Simulation parameters

参数	数值
信号长度/ms	10
中频载波频率/MHz	4^[13]
伪码长度/bit	1 023
码速率/Mcps	1.023
采样频率/MHz	100
设定待测时延/ns	10
补偿时延/ns	1 000
时域折叠段数	10

下载: 导出CSV

表 2 码相位测量误差均方差结果

Table 2. RMSE results of code phase measurement error

信噪比/dB	码相位测量误差均方差/m
信噪比/dB	相位条纹法	相干点积功率法
-15	0.371 1	1.821 7
-17	0.448 7	2.293 3
-19	0.549 7	2.887 1
-21	0.750 4	3.634 7
-23	1.129 2	4.575 8
-25	1.863 2	5.760 6

下载: 导出CSV

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