| 基于预平均处理的导航信号捕获技术 |
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| 引用本文： | 赵丙风,章林锋,孙寿浩.基于预平均处理的导航信号捕获技术[J].全球定位系统,2022,47(1):1-8. |
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| 作者姓名： | 赵丙风 章林锋 孙寿浩 |
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| 作者单位： | 1.中国电子科技集团公司第五十四研究所, 石家庄 050081 |
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| 摘 要： | 针对传统导航信号捕获算法资源消耗大、多普勒分辨率低的问题，提出了一种基于预平均处理的变系数匹配滤波的快速捕获方法. 该方法将经过预平均处理后的导航中频信号和本地信号主码存入相应存储器，然后经变系数匹配滤波器完成相关累加，再经快速傅里叶变换(FFT)频率估计器完成数据的频谱分析，最后利用验证模块对FFT输出结果的最大值进行二次验证，完成捕获检测. 所提方法在达到相同积分时间的同时节省了50%硬件资源，能够提高捕获多普勒分辨率以提高转跟踪成功率，通过软件灵活配置可以实现多系统多频点全球卫星导航系统(GNSS)信号的兼容处理.
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| 关 键 词： | 导航信号 预平均处理 变系数匹配滤波 快速捕获 多普勒分辨率 |
| 收稿时间： | 2021-06-16 |
Acquisition technique for navigation signals based on pre-average process |
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| Institution: | 1.The 54th Research Institute of CETC, Shijiazhuang 050081, China2.Unit 32021 of PLA, Beijing 100094, China |
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| Abstract: | To resolve large resource consumption and low Doppler resolution problem of traditional acquisition algorithm, a fast acquisition method based on pre-average and coefficient variable matched filter is proposed. The method stores the received intermediate-frequency signals and pseudo-code into corresponding dual-ports memory, completes correlation through coefficient variable matched filter, analyses the spectrum of correlation result by FFT. Finally, the maximum value of FFT output is verified to finish the Doppler estimation and acquisition process. The proposed method saves 50% hardware resources while reaching the same integration time, and can improve the Doppler resolution which can improve the probability of signal tracking. The experiment results show that this method can implement modern multi-frequency GNSS signals acquisition through the flexible configuration. |
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