| 基于频域搜索的GPS信号P码直接捕获改进算法 |
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| 引用本文： | 孟维晓,王文静,叶准.基于频域搜索的GPS信号P码直接捕获改进算法[J].哈尔滨工业大学学报,2007,39(5):733-736. |
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| 作者姓名： | 孟维晓 王文静 叶准 |
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| 作者单位： | 1. 哈尔滨工业大学通信技术研究所,哈尔滨,150001
2. 哈尔滨工业大学(威海)信息科学与工程学院,山东威海,264209 |
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| 摘 要： | 为减少由峰值模糊造成的载波频偏误判概率,提出一种改进算法,通过计算Q路信号的相关值提高了对载波频率偏移的分辨能力,并利用相关值的重叠相加改进了目标码段的相关峰值.仿真结果表明,改进算法在不损失捕获速度和不增加资源消耗的前提下,有效地提高了检测概率、降低了载波频偏误判概率,是一种快速高效的GPS信号P码直接捕获算法.
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| 关 键 词： | P码直接捕获 频域搜索 FFT 序列块搜索 |
| 文章编号： | 0367-6234（2007）05-0733-04 |
| 修稿时间： | 2007-03-12 |
Improved algorithm for direct GPS signal P-Code acquisition based on frequency domain search |
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| MENG Wei-xiao,WANG Wen-jing,YE-zhun.Improved algorithm for direct GPS signal P-Code acquisition based on frequency domain search[J].Journal of Harbin Institute of Technology,2007,39(5):733-736. |
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| Authors: | MENG Wei-xiao WANG Wen-jing YE-zhun |
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| Affiliation: | 1.Communication Research Center;Harbin Institute of Technology;Harbin 150001;China;2.College of Information Science and Engineering;Harbin Institute of Technology at Weihai;Weihai 264209;China |
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| Abstract: | An improved algorithm is proposed to reduce the wrong judgment probability of carrier frequency due to ambiguous peak.It enhances the resolving power of carrier frequency offset by extracting the Q branch's spectrum to calculate the correlation and improves the correlation peak value of target sequence by using the overlap-add effect of correlation.Simulations are made to analyze the acquisition performance of the algorithm and the results show that the algorithm presented is a fast and effective direct acq... |
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| Keywords: | P code direct acquisition frequency domain search FFT sequential block search |
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