| 摘要: |
| 提出了一种基于直接序列扩频信号的双积分滑动相关捕获算法，同时使用两组相关器联合进行码相位的捕获，捕获的门限采用CAFR(常虚警率)自适应控制方式。文中给出了这个捕获方案的数学模型，并进行了具体分析。实验表明，利用FPGA实现这种捕获算法，不仅具有较高的性价比，而且衡量PN码捕获的最关键指标——平均捕获时间也大大少于常规捕获方法。 |
| 关键词: DS扩频信号 自适应门限 双积分滑动 捕获算法 直接序列扩频 PN码同步 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目: |
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| A Double-dwell Serial Search Acquisition Algorithm for DSSS Signals |
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| Abstract: |
| A new pseudo noise(PN) code double-dwell serial-search acquisition scheme for direct sequence spread spectrum(DSSS) signals is proposed based on constant false alarm rate(CFAR) criteria. And a joint decision rule of two correct cells is used. The mathmatics model is given and an analysis of it is made. The numerical results show that the proposed scheme not only saves much hardware resource , but also can have a short acquisition period than the conventional scheme, which is a most important performance measure of DSSS. |
| Key words: Direct-sequence spread spectrum,Adaptive threshold,Double-dwell serial search acquisition,Mean code acquisition time,Algorithm |
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