Accuracy Assessment of the TOPEX/Poseidon Ionosphere Measurements     

CHANGYIN ZHAO  C. K. SHUM  YUCHAN YI  SHENGJIE GE  DIETER BILITZA  PHILIP CALLAHAN 《Marine Geodesy》2013,36(3-4):729-739

We conducted an assessment of the TOPEX dual-frequency nadir ionosphere observations in the TOPEX/Poseidon (T/P) GDR by comparing TOPEX with the Center for Orbit Determination in Europe (CODE) Global Ionosphere Map (GIM), the climatological model IRI2001, and the DORIS (onboard T/P) relative ionosphere delays. We investigated the TOPEX (TOPEX Side A and TOPEX Side B altimeters, TSA and TSB, respectively) ionosphere observations for the time period 1995–2001, covering periods of low, intermediate, and high solar activity. Here, we use absolute path delays (at Ku-band frequency of the TOPEX altimeter and with positive signs) rather than Total Electron Content (TEC). We found significant biases between GIM and TOPEX (GIM–TOPEX) nadir ionosphere path delays: ?8.1 ± 0.4 {mm} formal uncertainties and equivalent to 3.7 TECu) and ?9.0 ± 0.7 {mm} (4.1 TECu) for TSA and TSB, respectively, indicating that the TOPEX path delay is longer (or with higher TECu) than GIM. The estimated relative biases vary with latitude and with daytime or nighttime passes. The estimated biases in the path delays (DORIS–TOPEX) are: ?10.9 ± 0.4 {mm} (5.0 TECu) and ?14.8 ± 0.6 {mm} (6.7 TECu), for TSA and TSB, respectively. There is a distinct jump of the DORIS path delays (?3.9 ± 0.7 {mm}, TSA delays longer than TSB delays) at the TSB altimeter switch in February 1999, presumably due to inconsistent DORIS processing. The origin of the bias between GIM (GPS, L-band) and TOPEX (radar altimeter, Ku-band) is currently unknown and warrants further investigation. Finally, the estimated drift rates between GIM and TSA, DORIS and TSA ionosphere path delays for the 6-year study span are ?0.4 mm/yr and ?0.8 mm/yr, respectively, providing a possible error bound for the TOPEX/Poseidon sea level observations during periods of low and intermediate solar activity.  相似文献   

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刘伟  郑作亚  郭英  徐运广 《大地测量与地球动力学》2013,33(2):120-123

????Chapman?????????г????????????????????????????????й?????GPS CORS???????????й????????????????????????????????????????????????????в???????0.311 m???????????????????????????????????仯???о???????????÷????????????????н????????????????????????????????????仯????????  相似文献   

沈阳站电离层F2层临界频率变化特征     

郭晓燕  张伟  李彤霞 《东北地震研究》2012,28(4)

本文对沈阳站电离层测高仪2009—2012年观测数据的月均值进行了统计分析,揭示了沈阳站电离层F2层临界频率的日变化和年变化特征。  相似文献   

The Tromsø dynasonde     

M.T. Rietveld  J.W. Wright  N. Zabotin  M.L.V. Pitteway 《Polar Science》2008,2(1):55-71

  相似文献   

附加GIM约束的全球电离层建模     

刘磊  姚宜斌  孔建  翟长治 《大地测量与地球动力学》2017,37(1):67-71

针对目前地基GNSS台站在全球分布不均匀,导致南半球海洋和中高纬地区出现与实际不符的VTEC为负值的问题,利用IGS前1 d的最终GIM作为虚拟观测值对TEC可能为负值的地区进行约束,结合GNSS数据建立全球电离层模型(称为SGG模型),并用2014年200多个IGS台站数据对模型进行验证。结果表明,各台站VTEC的RMS优于3 TECu(赤道异常区域RMS在5~7 TECu)。同时SGG能有效消除南半球海洋(40°~90°S)VTEC为负的情况,且对原有非负VTEC几乎没有影响(其变化小于2 TECu)。SGG的卫星DCB与CODE 相比,RMS和MEAN分别优于0.2 ns和0.04 ns,不同纬度带SGG与CODE的接收机DCB估值变化基本一致,两者之差基本在1 ns以内。  相似文献   

����GPS���ϼ���ɽվ�����TEC�����о�   总被引：5，自引：1，他引：4  

孟泱  安家春  王泽民  鄂栋臣 《大地测量与地球动力学》2010,30(1):43-47

????2000??2006?????????GPS?????????о??????????TEC????????????????????????????仯?????????????????GPS??TEC????????????????????????仯???????????????????TEC?仯?????????????????????????????????????????????????  相似文献   

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高淑照  黄丁发 《大地测量与地球动力学》2010,30(6):112-115

???????????????????????VTEC????????????????????????????????????????????????????е?GPS??????????3С???????????????????????????????????????Ч??С????????  相似文献   

厦门电离层垂测站建设及初步结果   总被引：1，自引：1，他引：0       下载免费PDF全文

余涛  王云冈  王劲松  毛田  帅方红  苏卫东  李建通 《地球物理学进展》2010,25(2):538-542

本文介绍了厦门电离层垂直探测站的建设及初步结果.该站选用了加拿大生产的数字测高仪,利用折合偶极天线作为发射和接收天线,采用气象信息专业网和internet网络的两种传输方式,实现了数据实时传输和远程控制.利用试验观测期间获得的2007年8月份首批电离层垂直探测数据,分析发现了厦门地区电离层f_oF2的一些基本特征：白天f_oF2最大值一般出现在地方时14~16点,最大值约5~15 MHz,有较强逐日变化;夜间f_oF2约4MHz左右,逐日变化较小.与最新国际电离层参考模式IRI2007进行了初步对比,发现IRI2007可较好的预报出f_oF2的月中值,但对逐日变化较强的厦门地区电离层f_oF2预报能力较弱.  相似文献   

Total solar eclipse of July 22, 2009: Its impact on the total electron content and ionospheric electron density in the Indian zone     

Shweta Sharma  N. Dashora  P. Galav  R. Pandey   《Journal of Atmospheric and Solar》2010,72(18):1387-1392

The longest total solar eclipse during the 21st century occurred in South and East Asia on July 22, 2009. Ionospheric response to this rare total solar eclipse which was observed right from the time of sunrise in the Indian zone, has been studied in terms of the total electron content (TEC) obtained from three global positioning system (GPS) receivers located at Udaipur, Hyderabad and Bengaluru, and electron density obtained using space based GPS-Radio Occultation technique. The study reveals significant reductions in the electron density and TEC that persisted up to 2 h past the last contact even during early morning eclipse. These observations imply that during the early morning eclipse, the production and loss of ionization dominate over the plasma transport processes.  相似文献   

两种电离层延迟改正模型对星载单频GPS实时定轨精度的影响     

王甫红  郭磊  邵晓东  龚学文 《大地测量与地球动力学》2016,36(7):565-569

采用单频星载GPS实测伪距和载波相位观测值,结合不同的电离层延迟改正模型进行模拟实时定轨实验,分析单频实时定轨的精度。不同轨道高度的低轨卫星实验结果表明,在卫星轨道较高(500 km以上)时,使用单频伪距观测值与改进的Klobuchar模型,实时定轨位置精度可达0.86 m(三维RMS),速度精度可达0.9 mm/s,接近甚至优于双频伪距实时定轨的轨道精度;使用单频码相无电离层组合观测值时,实时定轨位置精度可达0.54 m,速度精度可达0.55 mm/s。采用合适的电离层延迟改正模型,廉价的单频星载接收机可应用于微小卫星的实时定轨。  相似文献