| 引用本文: | 沙海,黄新明,张鑫,等.VFD滤波器的导航信道模拟器动态时延模拟方法.[J].国防科技大学学报,2014,36(4):61-65.[点击复制] |
| SHA Hai,HUANG Xinming,ZHANG Xin,et al.Method of pseudo-range Doppler simulation in navigation channel simulator on VFD filter[J].Journal of National University of Defense Technology,2014,36(4):61-65[点击复制] |
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| VFD滤波器的导航信道模拟器动态时延模拟方法 |
| 沙海, 黄新明, 张鑫, 牟卫华, 欧钢 |
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(国防科技大学 电子科学与工程学院， 湖南 长沙 410073)
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| 摘要: |
| 针对卫星导航信道模拟器信号仿真中，传统伪距多普勒模拟方法瞬时控制精度差、滤波器资源占用较大的不足，提出了基于拉格朗日插值延迟滤波器及Farrow结构实现的伪距多普勒模拟方法。在分析信道模拟器系统架构的基础上，建立了多普勒模拟方法的模型，包括延时计算模块和可变延迟滤波器两部分。与多速率采样数字延迟滤波器方法比较，该方法滤波器系数个数约为后者的0.2%，并且改变时延特性时，仅需更新1个参数。信道模拟器实测数据结果表明使用该方法伪码多普勒模拟精度可以达到0.1mHz。 |
| 关键词: 卫星导航 信道模拟器 伪距多普勒 可变分数延迟滤波器 Farrow结构 |
| DOI：10.11887/j.cn.201404011 |
| 投稿日期：2011-06-11 |
| 基金项目:教育部新世纪优秀人才支持计划项目（NCET-08-0144） |
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| Method of pseudo-range Doppler simulation in navigation channel simulator on VFD filter |
| SHA Hai, HUANG Xinming, ZHANG Xin, MOU Weihua, OU Gang |
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(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073,China)
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| Abstract: |
| In satellite navigation channel simulator, the traditional pseudo-range Doppler simulation method has some flaws, such as the low delay accuracy and the large filter resource. A new Doppler simulation method is proposed, using Lagrange interpolation variable fraction delay filter and Farrow structure. Based on analyzing the system architecture of channel simulator, the model of Doppler simulation was established, including the delay calculation module and variable delay filter. Compared with the multi-rate sampling digital delay filter method, the proposed method is just about 0.2% of the former filter resource, and the one parameter is just changed when the delay of filter is changed. Actual measured results with channel simulator indicate that the Doppler accuracy is 0.1 mHz. |
| Keywords: satellite navigation channel simulator pseudo-range Doppler variable fraction delay filter farrow structure |
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