| 摘要: |
| 提出一种减小直接序列扩频(DSSS)接收机信号捕获时间的改进方法.在传统滑动相关捕获算法基础上,增加一条参考支路,使相关曲线出现正负双峰值.利用双峰设置正负门限,形成二次判决,在不增加系统复杂度的基础上,减小了虚警概率,减少了平均捕获时间.计算机仿真证明了该方法的有效性.实验数据表明该方法在低信噪比下效果更加明显. |
| 关键词: 直接序列扩频 接收机 滑动相关捕获 正负门限 虚警概率 |
| DOI：10.3969/j.issn.1001-893X. |
| 投稿时间：2006-05-22修订日期：2006-09-25 |
| 基金项目: |
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| Improvement and Performance Analysis of Slippage Correlation Acquisition for DSSS Signals |
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| Abstract: |
| A better method for direct sequence spread spectrum(DSSS) receiver to decrease the acquisition time is proposed.Based on the traditional slippage correlation acquisition,adding an external circuit for reference makes the positive-negative maximum of the merit of correlation.Dual-judgement uses the positive-negative threshold based on the two maximum values.So the probability of alarm and acquisition time are decreased without increasing complexity of the system.The availability is proved by simulation.The data from experiment show that the method is more efficient in low SNR. |
| Key words: DSSS receiver slippage correlation acquisition positive - negative threshold probability of alarm |
《电讯技术》编辑部 