GRACE Follow-On卫星的星载GNSS相位测速法

doi:10.11947/j.AGCS.2021.20200140

测绘学报 ›› 2021, Vol. 50 ›› Issue (12): 1772-1779.doi: 10.11947/j.AGCS.2021.20200140

GRACE Follow-On卫星的星载GNSS相位测速法

刘晗, 魏辉, 邹贤才

武汉大学测绘学院, 湖北武汉 430079

收稿日期:2020-04-15 修回日期:2020-09-03 发布日期:2022-01-08
作者简介:刘晗(1996—),女,硕士,研究方向为卫星精密定轨。
基金资助:
国家自然科学基金（41874021）；民用航天“十三五”技术预先研究项目；2020年度博士后创新人才支持计划

Precise GNSS phase velocity determination for GRACE Follow-On satellites

LIU Han, WEI Hui, ZOU Xiancai

School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

Received:2020-04-15 Revised:2020-09-03 Published:2022-01-08
Supported by:
The National Natural Science Foundation of China (No. 41874021);The Civil Aerospace "13th Five-Year" Preliminary Research Project;The Fellowship of China National Postdoctoral Program for Innovative Talents (No. BX20200251)

摘要/Abstract

摘要： 通常认为，低轨卫星的速度和加速度信息需要首先进行卫星精密定轨，再通过轨道微分法得到最终解算结果。本文基于GRACE Follow-On卫星的GPS载波相位观测数据，通过数值微分方法直接对载波进行微分，解算得到卫星的速度和加速度。基于2018-11-01—2018-11-10的GRACE Follow-On C/D卫星实测数据进行了试验，利用CODE精密星历和5 s钟差产品，结果表明，当微分器长度设置为9点时，载波相位直接法确定C和D卫星速度的3D RMS分别可达0.227 6 mm/s和0.238 4 mm/s（微分间隔为60 s）；确定卫星加速度的3D RMS分别可达 4.1 μm/s²和4.5 μm/s² （微分间隔为90 s）。载波相位直接微分法相比于运动学轨道差分法而言，无须固定模糊度，削弱了轨道历元间相关性对其微分速度和加速度的影响，可为GRACE Follow-On任务的精密定轨和重力场解算提供高精度的速度和加速度信息。

关键词: GRACE Follow-On, 星载GPS, 载波相位, 卫星加速度

Abstract: In this study, we composed the velocity and acceleration of GRACE Follow-On satellites directly estimated from the onboard carrier phase observations based on the FIR (finite impulse response) differentiator instead of the orbit differentiation method. Using the level 1B data of GRACE Follow-On from DOY 305 to 314 in 2018, CODE(Center for Orbit Determination in Europe)precise ephemeris and 5 s clock corrections, the results showed that based on the ninth-point differentiator, the 3D root mean square (RMS) of satellite C and D velocity can achieve the accuracy at 0.227 6 mm/s and 0.238 4 mm/s (differentiator interval=60 s); Meanwhile, the 3D RMS values of acceleration can achieve the accuracy at 4.1 μm/s² and 4.5 μm/s² for satellite C and D respectively (differentiator interval=90 s). The GNSS phase direct differentiation method does not require a fixed ambiguity, which weakens the influence of the correlation between orbit epochs, respect to the kinematic orbit difference method and provides high-precision velocity and acceleration information for gravity field model determination.

Key words: GRACE Follow-On, on-board GPS observation, carrier phase, LEO acceleration

中图分类号:

P227

刘晗, 魏辉, 邹贤才. GRACE Follow-On卫星的星载GNSS相位测速法[J]. 测绘学报, 2021, 50(12): 1772-1779.

LIU Han, WEI Hui, ZOU Xiancai. Precise GNSS phase velocity determination for GRACE Follow-On satellites[J]. Acta Geodaetica et Cartographica Sinica, 2021, 50(12): 1772-1779.

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GRACE Follow-On卫星的星载GNSS相位测速法

Precise GNSS phase velocity determination for GRACE Follow-On satellites

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