| 改进的GPS掩星滑动频谱方法 |
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| 引用本文： | 徐贤胜,郭鹏.改进的GPS掩星滑动频谱方法[J].中国空间科学技术,2011,31(4). |
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| 作者姓名： | 徐贤胜 郭鹏 |
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| 作者单位： | 1. 上海大学上海市应用数学和力学研究所,上海,200072
2. 中国科学院上海天文台,上海,200030 |
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| 基金项目： | 地震行业科研专项(201108004); 国家863高科技计划(2009AA12Z319); 国家自然科学基金(41075081)资助项目 |
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| 摘 要： | 在大气多路径和噪声的条件下,高斯白噪声会造成滑动频谱方法获得的弯曲角与真值之间的偏离,无法获得较好的反演结果.为此,文章提出了一种改进的滑动频谱方法,即利用信号的振幅和谱能量信息对滑动频谱方法进行修正,削弱了信号中噪声的影响,与真值较为接近.分别用改进前后两种方法对中华卫星三号计划(Constellation Observing System for Meteorology,Ionosphere and Climate,COSMIC)的掩星进行反演,并将其折射率计算结果和通过全谱反演方法获得的折射率一起,与欧洲中期天气预报中心( European Centre for Medium-Range Weather Forecasts,ECMWF)的分析场资料进行了统计比较.结果表明:改进的滑动频谱方法删除了信号中的部分噪声,减少了系统偏差；与全谱反演方法进行比较,发现两者具有相当的反演精度.
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| 关 键 词： | 无线电掩星 滑动频谱方法 开环模式 多相位屏技术 卫星导航 |
Modified Sliding Spectral Method for GPS Occultation |
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| Xu Xiansheng,Guo Peng.Modified Sliding Spectral Method for GPS Occultation[J].Chinese Space Science and Technology,2011,31(4). |
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| Authors: | Xu Xiansheng Guo Peng |
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| Institution: | Xu Xiansheng1 Guo Peng2(1 Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072)(2 Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030) |
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| Abstract: | The limitations of the sliding spectral(SS) method are the restriction of the resolution of bending angle profiles due to the noise in the moist lower troposphere.It has been validated by simulations of atmospheric propagation using multiple phase screens technique under multipath conditions.A modified sliding spectral(MSS) method was developed to reduce these limitations.It demonstrates that MSS method can reasonably identify and decrease noise which may introduce retrieval errors in classical SS method,as... |
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| Keywords: | Radio occultation Sliding spectral method Open-loop mode Multiple phase screens technique Satellite navigation |
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