| 基于动态阈值的移动终端GNSS定位阴影匹配算法 |
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| 引用本文： | 王式太,张博宇,殷敏.基于动态阈值的移动终端GNSS定位阴影匹配算法[J].大地测量与地球动力学,2021,41(11):1101-1105. |
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| 作者姓名： | 王式太 张博宇 殷敏 |
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| 作者单位： | 桂林理工大学测绘地理信息学院,桂林市雁山街319号,541006;广西空间信息与测绘重点实验室,桂林市雁山街319号,541006;桂林理工大学测绘地理信息学院,桂林市雁山街319号,541006 |
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| 摘 要： | 阴影匹配算法可在城市峡谷中较好地提高移动终端GNSS定位精度，但是传统阴影匹配算法中用于判断卫星可见性的信噪比阈值为固定单一阈值，无法保证所有卫星可见性的判断正确，从而影响定位精度。针对以上情况提出基于动态阈值的阴影匹配算法，使每颗卫星的判断阈值随卫星几何可见性和信噪比可见性相互校正而改变。通过对手机GNSS原始定位结果及卡尔曼滤波后的定位结果进行两种阴影匹配算法计算及对比分析，结果表明，动态阈值法相对于单一阈值法平均点位误差在标准单点定位时可降低约15.1%，在卡尔曼滤波后可降低22.4%，定位精度均得到提升。
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| 关 键 词： | 阴影匹配 动态阈值 移动终端GNSS定位 信噪比 |
Research on Shadow Matching Algorithm for GNSS Positioning of Mobile Terminal Based on Dynamic Threshold |
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| WANG Shitai,ZHANG Boyu,YIN Min.Research on Shadow Matching Algorithm for GNSS Positioning of Mobile Terminal Based on Dynamic Threshold[J].Journal of Geodesy and Geodynamics,2021,41(11):1101-1105. |
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| Authors: | WANG Shitai ZHANG Boyu YIN Min |
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| Abstract: | The shadow matching algorithm can improve the GNSS positioning accuracy of mobile terminal in urban canyons, but the signal-to-noise ratio (SNR) threshold used to judge the visibility of satellites in traditional shadow matching algorithm is a fixed single threshold that cannot ensure the correct judgment of the visibility of all satellites, which affects the positioning accuracy. To the above situation, we propose a shadow matching algorithm based on dynamic threshold. The judgment threshold of each satellite changes with the mutual correction of geometric visibility and SNR visibility. Through the calculation and comparative analysis of two shadow matching algorithms for mobile phone GNSS original positioning results and Kalman filtering positioning results, we prove that the average point error of dynamic threshold method can be reduced by 15.1% in standard single point positioning and 22.4% in Kalman filtering compared with single threshold method, and the positioning accuracy has been improved. |
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| Keywords: | shadow matching dynamic threshold mobile terminal GNSS positioning signal-to-noise ratio |
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