导航定位学报
導航定位學報
도항정위학보
Journal of Navigation and Positioning
2015年
3期
49-55
,共7页
袁运斌%李子申%王宁波%张宝成%霍星亮
袁運斌%李子申%王寧波%張寶成%霍星亮
원운빈%리자신%왕저파%장보성%곽성량
电离层延迟%全球导航卫星系统%拟合推估%北斗广域增强系统
電離層延遲%全毬導航衛星繫統%擬閤推估%北鬥廣域增彊繫統
전리층연지%전구도항위성계통%의합추고%북두엄역증강계통
ionospheric delay%GNSS%collocation%BDS wide area augmentation system
高精度的格网电离层是广域增强系统建设和应用的重要信息之一,针对我国区域电离层复杂多变的特点,本文将电离层延迟变化分为趋势项和随机项两部分,推导了利用拟合推估原理进行中国区域电离层延迟建模的基本方法;在此基础上,利用电离层活动高年、中年和低年的观测数据对方法的精度进行了详细评估。试验结果表明:基于拟合推估的电离层延迟建模方法的修正精度在电离层活动高年约为0.4~0.7 m,在电离层活动低年约为0.2 m;对于我国中纬度地区,基准站间距可适当放大至800 km 左右,而在我国低纬度地区基准站间距应保持在350~450 km 之间。
高精度的格網電離層是廣域增彊繫統建設和應用的重要信息之一,針對我國區域電離層複雜多變的特點,本文將電離層延遲變化分為趨勢項和隨機項兩部分,推導瞭利用擬閤推估原理進行中國區域電離層延遲建模的基本方法;在此基礎上,利用電離層活動高年、中年和低年的觀測數據對方法的精度進行瞭詳細評估。試驗結果錶明:基于擬閤推估的電離層延遲建模方法的脩正精度在電離層活動高年約為0.4~0.7 m,在電離層活動低年約為0.2 m;對于我國中緯度地區,基準站間距可適噹放大至800 km 左右,而在我國低緯度地區基準站間距應保持在350~450 km 之間。
고정도적격망전리층시엄역증강계통건설화응용적중요신식지일,침대아국구역전리층복잡다변적특점,본문장전리층연지변화분위추세항화수궤항량부분,추도료이용의합추고원리진행중국구역전리층연지건모적기본방법;재차기출상,이용전리층활동고년、중년화저년적관측수거대방법적정도진행료상세평고。시험결과표명:기우의합추고적전리층연지건모방법적수정정도재전리층활동고년약위0.4~0.7 m,재전리층활동저년약위0.2 m;대우아국중위도지구,기준참간거가괄당방대지800 km 좌우,이재아국저위도지구기준참간거응보지재350~450 km 지간。
Grid-based ionospheric information with high accuracy is crucial to the Wide Area Augmentation System (WAAS)establishment and operation.With the specialty and complexity of the ionospheric conditions over China region,an approach is proposed to model the Chinese regional ionosphere using collocation after splitting the ionospheric delays into a de-terministic trend together with a stochastic component.The usefulness of the method is validated with GPS measurements col-lected during high-,medium-and low-solar activities over China.It follows from our analyses that,the accuracy of our method resides within 0.4-0.7 m during high-solar activity year,whereas it is reduced to approximately 0.2 m during low-solar activity year.Considering the mid-latitude area of China,the distance between reference stations can maintain about 800 km.For the low-latitude area,however,such a distance should be limited between 350 km and 450 km.