北斗广播星历偏差分析及改正

发布时间：2018-09-17 17:27

【摘要】：以后处理精密轨道钟差为参考,分析了2014年2月至2016年10月北斗广播星历误差及空间信号精度,分析结果表明,北斗广播星历存在偏差,最大超过2m。在此基础上,基于广域差分改正数,采用18个MGEX站不同频点及频点组合连续97d的数据对以上广播星历偏差进行了进一步验证。验证结果表明,不同卫星的伪距观测残差存在与广播星历偏差一致的系统性偏差。比较后处理给出的TGD和广播星历给出的TGD参数的偏差(dTGD),发现dTGD与基于广域差分参数的BEB的相关系数达到0.89,这表明经广域差分参数改正后的星历偏差可能是由广播电文中的TGD偏差造成。将北斗广播星历偏差改正到TGD参数上,分析对用户定位的影响。结果表明,经改正后,双频用户在N、E、U 3个方向单点定位精度分别提高14.9%、28.4%、15.5%,其定位残差也明显得到改善。
[Abstract]:The error of Beidou broadcast ephemeris and the precision of space signal are analyzed from February 2014 to October 2016. The results show that the error of Beidou broadcast ephemeris is more than 2 m. On this basis, based on the wide area difference correction, the above broadcast ephemeris deviation is further verified by the data of 18 MGEX stations with different frequency points and the combination of frequency points for 97 days. The results show that there is a systematic deviation in the pseudo-range observation residual of different satellites in accordance with the broadcast ephemeris deviation. Comparing the deviation of TGD parameters given by post-processing TGD and broadcast ephemeris (dTGD), it is found that the correlation coefficient between dTGD and BEB based on wide-area differential parameters is 0.89, which indicates that the corrected ephemeris deviation by wide-area differential parameters may be attributed to broadcast. The TGD bias in the message results in. The error of Beidou broadcast ephemeris is corrected to the TGD parameter, and the influence on user location is analyzed. The results show that, after correction, the positioning accuracy of dual-frequency users in the three directions is increased by 14.9and 28.4and 15.5respectively, and the positioning residuals are also improved obviously.
【作者单位】：同济大学测绘与地理信息学院;中国科学院上海天文台;中国科学院大学;北京卫星导航中心;
【基金】：国家863计划(2014AA123102) 国家自然科学基金(11673050;11273046)~~
【分类号】：P228.4;TN967.1

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