| 基于数据压缩的二次扩频信号时域捕获方法 |
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| 引用本文： | 罗正平,林静然,李玉柏,彭启琮.基于数据压缩的二次扩频信号时域捕获方法[J].数据采集与处理,2012,27(3):394-398. |
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| 作者姓名： | 罗正平 林静然 李玉柏 彭启琮 |
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| 作者单位： | 电子科技大学通信与信息工程学院,成都,611731 |
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| 基金项目： | 中央高校基本科研业务费 |
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| 摘 要： | 提出了一种基于数据压缩的二次扩频信号时域捕获方法,可以在几乎不影响捕获性能的条件下,降低时域捕获的运算量,提高捕获速度。根据传统捕获法中重复数据的特点,本文提出了一种数据压缩方法:首先,利用NCO原理将接收数据按半码片边界进行压缩;其次,根据二次扩频信号中PRN码的周期性特点进行周期压缩;最后,进行二维扩频码相位搜索。仿真结果表明该方法的捕获增益损失很小,并且在很大程度上降低了运算的冗余度。
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| 关 键 词： | 数据压缩 时域捕获 二次扩频 |
Fast Time Acquisition Method for PSK-2DSSS Based on Data Compression |
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| Luo Zhengping
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Lin Jingran
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Li Yubai
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Peng Qicong.Fast Time Acquisition Method for PSK-2DSSS Based on Data Compression[J].Journal of Data Acquisition & Processing,2012,27(3):394-398. |
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| Authors: | Luo Zhengping Lin Jingran Li Yubai Peng Qicong |
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| Affiliation: | (School of Communication and Information Engineering,University of Electronic Science and Technology of China,Chengdu,611731,China) |
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| Abstract: | A new fast acquisition algorithm for two-dimensional direct sequence spread spectrum(2DSSS) signal realized on non-coding PSK modulation(PSK-2DSSS) is proposed.It can reduce the redundant operations in conventional time domain correlation methods.Firstly,the received signal is compressed according to half-chip boundaries,under the control of NCO principles.Then,considering the periodic characteristic of the PRN code in the 2D spread spectrum sequence,the traditional acquisition flow is adjusted to eliminate the reduplicate multiply operations in correlation processing.As a result,the acquisition computational complexity is decreased significantly,at a cost of slight performance degradation.Simulations confirm the correctness and effectiveness of the proposed method. |
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| Keywords: | data compression time-domain acquisition phase shift keying modulated two-dimensional direct sequence spread spectrum(PSK-2DSSS) |
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