| 动态环境下基于FFT实现伪码快速捕获 |
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| 引用本文： | 徐定杰,石吉利.动态环境下基于FFT实现伪码快速捕获[J].中国航海,2003(2):1-4. |
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| 作者姓名： | 徐定杰 石吉利 |
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| 作者单位： | 哈尔滨工程大学,黑龙江,哈尔滨,150001 |
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| 基金项目： | 黑龙江省自然科学基金资助项目 (F0 2 12 ) |
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| 摘 要： | 无线电导航系统中，载体动态性引入的多普勒频移对扩频信号捕获造成了很大困难。针对全数字化实现的扩频接收机，提出了一种新的捕获方案，即基于FFT算法实现对多普勒进行一定程度的补偿，解决了高动态环境下伪码序列的快速捕获问题。理论分析和计算机仿真结果表明，该方法简单有效。
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| 关 键 词： | 动态环境 FFT 伪码快速捕获 信号处理 多普勒频移 无线电导航系统 扩频接收机 伪码序列 |
| 文章编号： | 1000-4653(2003)02-0001-04 |
| 修稿时间： | 2003年3月7日 |
A FFT-based Approach for PN Code Fast Acquisition Operation in Dynamic Situation |
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| XU Ding jie,Shi Ji li.A FFT-based Approach for PN Code Fast Acquisition Operation in Dynamic Situation[J].Navigation of China,2003(2):1-4. |
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| Authors: | XU Ding jie Shi Ji li |
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| Abstract: | It is difficult for a receiver operating in dynamic situation to realize spread spectrum signal acquisition in navigation system. For a receiver that realized by all digital model, a new acquisition mode called FFT based algorithm, is presented, which estimates the Doppler shift during the PN phase acquisition. The algorithm solves the problem of signal acquisition when the receiver operating in dynamic situation. The analysis and simulations show that the FFT based algorithm is simple, efficient and very suitable for DSP implementation. |
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| Keywords: | Signal processing technique Parallel acquisition FFT algorithm Doppler shift Correlation |
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