| GPS接收机数字码跟踪环性能研究 |
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| 引用本文： | 周密,张晓玲. GPS接收机数字码跟踪环性能研究[J]. 航空电子技术, 2004, 35(2): 6-10 |
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| 作者姓名： | 周密 张晓玲 |
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| 作者单位： | 电子科技大学电子工程学院,成都,610015;电子科技大学电子工程学院,成都,610015 |
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| 摘 要： | 建立了伪码捕获和跟踪过程的数学模型;推导出了伪码捕获的检测概率和虚警概率,提出了改进的双Dwell搜索方法;对一阶、二阶、三阶DDLL的动态跟踪性能及输入随机噪声影响进行了定量分析。研究结果表明,双Dwell搜索方法能显著缩短平均捕获时间,应根据不同的系统动态特点,选择不同的环路参数,以优化码跟踪环的特性。
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| 关 键 词： | 伪码捕获和跟踪 双Dwell搜索 伪码相位误差 |
| 文章编号： | 1006-141X(2004)02-0006-05 |
| 修稿时间： | 2003-10-17 |
Performance Analysis of Digital Delay-locked Loop for GPS Receiver |
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| ZHOU Mi,ZHANG Xiao-ling. Performance Analysis of Digital Delay-locked Loop for GPS Receiver[J]. Avionics Technology, 2004, 35(2): 6-10 |
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| Authors: | ZHOU Mi ZHANG Xiao-ling |
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| Abstract: | The paper gives a mathematical model for the digital PRN code acquisition and tracking process, derives expressions of the detection and false-alarm probabilities, presents the improved double-dwell search strategy and analyzes the dynamic tracking performance and influence of input noise mathematically. The results of analysis show double dwell search strategy could reduce mean time of acquisition dramatically. Different loop parameters should be selected according to different system circumstances for optimizing the performance of DDLL. |
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| Keywords: | PRN code acquisition and tracking double-dwell search PRN phase error |
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