| 双线性极化天线的CAPS信号合成捕获算法 |
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| 作者姓名： | 甘彤 王晓岚 马冠一 |
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| 作者单位： | 1. 京都大学生存圈研究所, 京都 606-8501;
2. 中国科学院国家天文台, 北京 100012;
3. 中国科学院大学, 北京 100049 |
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| 基金项目： | Supported by the Key Research Programs of Chinese Academy of Sciences (KGFZD-125-14-005-2, KJCX2-EW-J01) and the Knowledge Innovation Program of Chinese Academy of Sciences (KGCX2-EW-407-1) |
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| 摘 要： | 针对中国区域定位系统(China area positioning system,CAPS)接收机采用圆极化天线接收极化信号时会引入3 dB的极化损失问题,提出一种基于双线性极化天线的信号合成捕获算法.该算法先对双线性极化天线接收的两路CAPS导航信号进行捕获,并根据捕获结果进行信号同步;进而利用最大信噪比合并来合成两路信号,从而提高接收信号的信噪比.通过实测数据分析表明,该算法得到的合成信号的信噪比比单路信号得到的信噪比增加1.5dB,提高了信号接收的灵敏度.
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| 关 键 词： | CAPS系统 双极性极化天线 信号捕获 信号合成 信噪比 |
| 收稿时间： | 2014-11-27 |
| 修稿时间： | 2015-05-13 |
An algorithm for CAPS signal acquisition and synthesis with dual-linear polarized antennas |
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| Authors: | GAN Tong WANG Xiaolan MA Guanyi |
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| Institution: | 1. Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 606-8501, Japan;
2. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | A polarization loss of 3 dB is caused by circular polarized antenna when receiving the linear polarized signal in China area positioning system (CAPS). This work proposes to use dual-linear polarized antenna to receive CAPS signal and accordingly develops a signal acquisition and synthesis algorithm. The algorithm first performs signal acquisition with the dual-linear polarization antenna channels. According to the acquisition results the algorithm then synchronizes the signals. After the synchronization, it sums the signals from the two channels using the maximal-SNR (signal-to-noise ratio) combination. The algorithm is verified by its application to an experimental receiver. By analyzing the CAPS data acquired by the experimental receiver, it is found that the SNR of the synthesized signal increases by about 1.5 dB over the one-channel signals. |
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| Keywords: | CAPS system dual-linear polarized antennas signal acquisition signal synthesis SNR |
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