海洋二号D卫星(HY-2D)是中国第4颗海洋动力环境卫星,为研究HY-2D卫星的多普勒无线电定轨定位系统DORIS(Doppler Orbitography and Radio-positioning Integrated by Satellite)的定轨精度,本文构建了卫星姿态模型,选择2021年6月5-17日DORIS相位测量数据,采用观测值历元间差分和动力学方法进行精密定轨,对定轨结果通过观测值拟合残差、重叠弧段、轨道相互比较和激光检核4种方法评估轨道精度,并对使用姿态模型或姿态数据的2种定轨结果之间差异进行讨论.结果表明:(1)13 d观测值残差RMS均值约为0.355 mm/s,轨道重叠弧段三维差异的RMS＜2.0 cm;(2)与法国国家空间研究中心CNES(Centre National D'Etudes Spatiales)的精密轨道相比,使用姿态数据两者在径向R、切向T、法向N方向上差异的均方根误差RMS(Root Mean Square)分别为1.02 cm、2.92 cm和3.11 cm,使用姿态模型两者在径向R、切向T、法向N方向上差异的RMS分别为0.97 cm、2.77 cm和3.15 cm.2种结果接近,表明卫星姿态模型与实测姿态数据符合程度高;(3)用激光检核本文计算的轨道与CNES参考轨道的精度,测距残差的RMS分别为2.38 cm和2.24 cm,两种轨道精度相当.
Precise orbit determination of HY-2D using DORIS
The Haiyang 2D satellite(HY-2D)is the fourth marine dynamic environment satellite in China,which belongs to the marine remote sensing satellite series in China,with high-precision orbit measurement,orbit determination capabilities,and all-weather,all-day,global detection capabilities.The main mission of the satellite is to monitor and investigate the marine environment;obtain various marine dynamic environmental parameters,including sea surface wind field,wave height,and sea surface height;directly provide measured data for the early warning and prediction of catastrophic sea conditions;and provide support services for marine disaster prevention and reduction,marine rights and interest protection,marine resource development,marine environmental protection,marine scientific research,and national defense construction.After the launch of the HY-2D satellite,the HY-2B and HY-2C satellites realize three-star network observation.An accurate orbit of HY-2D is a prerequisite for mission accomplishment.It is equipped with the DORIS receiver for precise orbit determination.The attitude of the satellite alternates between fixed mode and nominal yaw-steering mode.To study the accuracy of orbit determination of HY-2D using DORIS,we build a satellite attitude model,select DORIS phase measurement data from June 5 to June 13,2021,and adopt the epoch-difference and dynamic orbit determination methods for precise orbit determination.Orbital accuracy is evaluated by postfit residuals and by overlapping and comparing with CNES and SLR.The differences between the two orbit determination results using attitude model and attitude data are discussed.Results show the following:(1)The mean of the postfit residuals is 0.355 mm/s,and the mean of 3D RMS is within 2 cm.(2)Compared with the precise orbit by CNES,the RMS values when using attitude data in the R,T,and N directions are 1.02,2.92,and 3.11 cm,respectively,and the RMS values when using the attitude model in the R,T,and N directions are 0.97,2.77,and 3.15 cm,respectively.The similarity between the two results indicates that the constructed satellite attitude model is consistent with the measured attitude data.(3)The mean RMS of SLR residuals for the CNES orbit and our orbit are 2.38 and 2.24 cm,respectively,indicating that the two orbits have similar accuracy.Our research shows that the on-board DORIS receiver has good and stable performance.By using the received data,we can provide a centimeter-level HY-2D satellite orbit,which can ensure the stable operation of satellite altimetry.
万方数据
维普
