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论文:2022,Vol:40,Issue(2):323-329 |
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引用本文： |
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王会宾, 程咏梅, 田朝旭. 强噪声下的矢量跟踪信号故障检测算法[J]. 西北工业大学学报 |
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WANG Huibin, CHENG Yongmei, TIAN Zhaoxu. A new signal fault detection algorithm for vector tracking loop in strong noise environments[J]. Northwestern polytechnical university |
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| 强噪声下的矢量跟踪信号故障检测算法 |
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| 王会宾, 程咏梅, 田朝旭 |
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| 西北工业大学 自动化学院, 陕西 西安 710072 |
| 摘要: |
| 在卫星导航系统的矢量跟踪结构中，由于鉴别器的非线性，异常的电离层、对流层延迟或多路径等其他干扰造成的信号故障通过鉴别器输出会产生失真，使得在强噪声环境下较大偏差的故障难以被检出，导致矢量跟踪结构的导航定位结果不准确。针对该问题，提出了一种强噪声环境下的矢量跟踪信号故障检测算法。该算法对鉴别器输出失真的原因及影响进行了分析;为降低其影响设计了一种专用于信号故障检测的码鉴别器，它对跟踪通道中的码相位偏差具有更大的正相关响应范围，因而可以使故障检测算法对强噪声环境下的大偏差突变故障和缓变故障具有检测能力;采用三阶球面-径向容积准则对测试统计量及其方差进行估计。不同噪声环境下的突变和缓变故障检测仿真实验表明，提出的算法能保持对0.5码片以上偏差突变故障的可靠检测。同时对强噪声环境比如25~30 dBHz环境下的缓变故障也具有一定的检测能力。 |
| 关键词:
矢量跟踪
故障检测
卡尔曼滤波
码鉴别器
球面-径向容积准则
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| A new signal fault detection algorithm for vector tracking loop in strong noise environments |
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| WANG Huibin, CHENG Yongmei, TIAN Zhaoxu |
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| School of Automation, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| In the vector tracking loop(VTL) of the satellite navigation system, the signal faults caused by the abnormal atmospheric disturbances or other interferences may be distorted when outputted by the discriminators, due to the nonlinearities in the discriminators. This makes the large bias faults in strong noise environments hard to detect and then the navigation solution may be contaminated. A new signal fault detection algorithm for VTL in strong noise environments is proposed in this paper to deal with this issue. Firstly, the reason and effects of distortion that occurs on discriminator output are analyzed. Then a new code discriminator is designed for signal fault detection, which owns a wider positive correlation output range about the code tracking error thus improving the detection ability for large abrupt bias faults and drift faults in strong noise environments. Later a third-degree spherical-radial cubature rule is employed to estimate the test statistic and its variance matrix. Finally, comparison trials about abrupt faults and drift faults in different noise environments illustrate that the proposed algorithm maintains reliable detection ability about abrupt faults that are larger than 0.5 chips and can detect drift faults in 25~30 dBHz strong noise environments. |
| Key words:
vector tracking
fault detection
Kalman filter
code discriminator
spherical-radial cubature rule
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| 收稿日期: 2021-06-01
修回日期:
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| DOI: 10.1051/jnwpu/20224020323 |
| 基金项目: 盲信号处理国家级重点实验室稳定支持经费项目（61424131903）资助 |
| 通讯作者: 程咏梅(1960-),女,西北工业大学教授,主要从事多源信息融合技术研究。e-mail:chengym@nwpu.edu.cn
Email：chengym@nwpu.edu.cn |
| 作者简介: 王会宾(1988-),西北工业大学博士研究生,主要从事卫星导航系统及其故障检测算法研究。
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