The performance of SF-PPP corrected by different ionospheric models
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摘要: 电离层延迟可严重制约单频接收机的定位精度. 基于此，本文介绍了四种单频接收机常用的电离层延迟改正方法，包括广播电离层改正模型(策略1)，顾及太阳位置的变化全球电离层格网产品(Global Ionosphere Map，GIM)时间旋转内插(策略2)，GIM投影函数改正(策略3)和半合改正模型(策略4). 同时，选择不同太阳活动期，不同纬度的测站验证不同电离层改正方法的单频精密单点定位(single-frequency point positioning，SF-PPP)定位结果偏差. 经过对比分析，得到如下结论：1)总体来说，半合改正模型得到的定位效果最佳，其次是使用GIM产品对电离层延迟进行改正，最后是广播电离层模型；2)在不同太阳活动跃期，不同策略在低纬度测站的定位偏差最大，其次是高纬度测站，中纬度测站的定位偏差最小；3)策略2和策略3在不同太阳活动期不同纬度测站的水平定位平差约0.150 m，三维定位偏差约0.700 m；策略4在不同太阳活动期不同纬度测站的水平定位偏差为0.100 m，三维定位偏差为0.500 m.
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关键词:
- 单频接收机 /
- 电离层 /
- 电离层改正模型 /
- 单频精密单点定位(SF-PPP)
Abstract: Ionospheric delay can seriously affect the positioning accuracy of single-frequency global navigation satellite system (GNSS) receiver. Thus, this paper assessed the positioning error of single-frequency GNSS receiver corrected by four commonly used ionospheric delay correction methods, i.e., broadcast ionospheric correction models (strategy 1), time-rotation interpolation of Global Ionosphere Map (GIM) considering the variation of the position for the sun (strategy 2), GIM corrected by ionospheric mapping function (strategy 3), and half-sum correction model (strategy 4). Meanwhile, the correction results of different methods for the single-frequency precise point positioning (SF-PPP) were evaluated by using the data collected by ground-based GNSS stations over different latitudes on solar condition days. The assessment results were listed as follows. 1) The positioning error of SF-PPP corrected by the half-sum correction model was the best, then was the ionospheric delay corrected GIM. The positioning error corrected by broadcast ionospheric model was the worst. 2) On different solar condition days of each strategy, the positioning error for low-latitude stations was the largest, the was high-latitude stations. The positioning error for mid-latitude stations was the smallest. 3) The horizontal positioning error of strategy 2 and strategy 3 was about 0.150 m over different latitudes on different solar activity periods, while the 3D positioning error is about 0.700 m. The corresponding errors were about 0.100 m and 0.500 m for strategy 4. -
表 1 SF-PPP采用的策略
项目 策略 使用软件 RTKLIB 轨道参数 IGS中心提供的事后精密星历 卫星系统 GPS 定位模型 静态 位置参数 IGS中心提供的每日SNX文件 卫星钟差 IGS中心提供的钟差产品 天线相位变化/偏差 根据IGS中心提供的天线文件进行改正 相对论效应 模型改正 潮汐改正 模型改正 截止高度角 15° 对流层改正 Saastamoinen模型 电离层改正 策略1：广播电离层模型(式(1))
策略2：GIM时间旋转内插(式(5))
策略3：GIM投影函数改正(式(6))
策略4：半合改正模型(式(7))
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表 2 实验期间SF-PPP定位精度统计结果
m 年份 策略 水平 3D 2014 策略1 0.496 0.957 策略2 0.188 0.635 策略3 0.164 0.642 策略4 0.118 0.476 2021 策略1 0.225 0.660 策略2 0.121 0.646 策略3 0.122 0.655 策略4 0.101 0.469
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表 3 2014年不同纬度测站不同策略SF-PPP定位精度统计结果
m 纬度 策略 水平 3D 高纬度 策略1 0.539 0.938 策略2 0.156 0.493 策略3 0.125 0.509 策略4 0.095 0.740 中纬度 策略1 0.251 0.614 策略2 0.121 0.304 策略3 0.115 0.283 策略4 0.097 0.324 低纬度 策略1 0.662 1.259 策略2 0.272 1.029 策略3 0.237 1.053 策略4 0.155 0.383
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表 4 2021年不同纬度测站不同策略SF-PPP定位精度统计结果
m 纬度 策略 水平 3D 高纬度 策略1 0.241 0.945 策略2 0.084 0.807 策略3 0.101 0.870 策略4 0.073 0.735 中纬度 策略1 0.171 0.516 策略2 0.128 0.245 策略3 0.130 0.254 策略4 0.099 0.292 低纬度 策略1 0.258 0.544 策略2 0.145 0.846 策略3 0.141 0.810 策略4 0.126 0.395
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