The Korean Multipurpose Satellite-5 (KOMPSAT-5) launched on 22 August 2013 was equipped with a global positioning system (GPS) receiver for precision orbit determination (POD). Even though the GPS receiver of KOMPSAT-5 shares the same heritage as the BlackJack receiver onboard in Gravity Recovery and Climate Experiment (GRACE) satellites, KOMPSAT-5 has a lower orbital position accuracy (~10 cm) compared with GRACE (~2 cm). The reduced dynamic and kinematic methods are applied for POD of KOMPSAT-5 and GRACE to investigate the GPS observation quality due to the satellite operation concept and hardware design. The results are analyzed in terms of the number of observations and their spatial distribution, GPS signal quality, and orbital position accuracies. The results show that the frequent attitude maneuvers of KOMPSAT-5 affect the quality of the GPS signals and solutions obtained from the kinematic method compared with that determined from the reduced-dynamic method. The onboard patch GPS antenna installed in KOMPSAT-5 and its geometrical position resulted in more erratic measurement residuals by 140% compared with the choke ring antenna of GRACE. The POD accuracy is dependent on the hardware design and regular attitude tilting for the synthetic aperture radar (SAR) imaging even though the same GPS receiver performances.

中文翻译：

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用GRACE进行KOMPSAT-5精密定轨的性能比较

2013年8月22日发射的韩国多用途卫星5号（KOMPSAT-5）配备了用于精确轨道确定（POD）的全球定位系统（GPS）接收器。即使KOMPSAT-5的GPS接收机与重力恢复和气候实验（GRACE）卫星上的BlackJack接收机具有相同的传承，KOMPSAT-5的轨道位置精度（〜10 cm）却比GRACE（〜2 cm）低）。由于卫星操作概念和硬件设计的原因，将简化的动态和运动学方法应用于KOMPSAT-5和GRACE的POD，以研究GPS观测质量。根据观测数量及其空间分布，GPS信号质量和轨道位置精度分析结果。结果表明，与简化动力方法相比，KOMPSAT-5频繁的姿态操纵会影响运动方法获得的GPS信号和解的质量。与GRACE的扼流圈天线相比，KOMPSAT-5中安装的板载GPS天线及其几何位置导致测量残差更加不稳定，减少了140％。POD精度取决于合成孔径雷达（SAR）成像的硬件设计和常规姿态倾斜，即使GPS接收器的性能相同。与GRACE的扼流圈天线相比，KOMPSAT-5中安装的板载GPS天线及其几何位置导致测量残差更加不稳定，减少了140％。POD精度取决于合成孔径雷达（SAR）成像的硬件设计和常规姿态倾斜，即使GPS接收器的性能相同。与GRACE的扼流圈天线相比，KOMPSAT-5中安装的板载GPS天线及其几何位置导致测量残差更加不稳定，减少了140％。POD精度取决于合成孔径雷达（SAR）成像的硬件设计和常规姿态倾斜，即使GPS接收器的性能相同。