| 基于匹配滤波方法的直接序列扩频系统伪码捕获性能分析 |
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| 引用本文： | 许晓勇,陈华明,王飞雪.基于匹配滤波方法的直接序列扩频系统伪码捕获性能分析[J].测绘科学,2008(Z1). |
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| 作者姓名： | 许晓勇 陈华明 王飞雪 |
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| 作者单位： | 国防科技大学电子科学与工程学院卫星导航研发中心 |
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| 摘 要： | 通常对匹配滤波法伪码捕获的性能分析都假设检测量独立。但对于实际的捕获系统,由于相邻检测量之间有公共的观测数据段,当伪码搜索间隔小于一个码片时,相邻检测量之间并不独立。建立了此条件下的基于匹配滤波的伪码捕获模型,并给出了高效的虚警分组验证策略,定义了该模型下的检测概率和虚警概率。用Monte Carlo方法分析了伪码搜索步进以及伪码相位偏移残差对捕获性能的影响。研究结果可用于指导扩频通信和导航系统接收机的设计。
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| 关 键 词： | 扩频 伪码捕获 匹配滤波器 数值分析 |
Performance analysis of a matched-filter PN code acquisition for direct-sequence spread-spectrum systems |
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| XU Xiao-yong CHEN Hua-ming WANG Fei-xue.Performance analysis of a matched-filter PN code acquisition for direct-sequence spread-spectrum systems[J].Science of Surveying and Mapping,2008(Z1). |
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| Authors: | XU Xiao-yong CHEN Hua-ming WANG Fei-xue |
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| Abstract: | Usually the performance analysis of a matched-falter PN code acquisition was carried out on the assumption that the de- tection measurements were independent.For practical system,the adjacent detection measurements are dependent when PN search size is smaller than one chip,for they had common input data.A matched-filter PN code acquisition model was formed for direct-sequence spread-spectrum systems.An efficient strategy of grouping false-alarm testing was provided.Probabilities of detection and false alarm were defined under the model.Using Monte Carlo simulation,the relation between acquisition performance and PN search step size, residual code phase offset was derived.The results can be used for receiver design of spread spectrum system and navigation system. |
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| Keywords: | spread-spectrum code acquisition matched-filter numerical analysis |
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