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<p>The SuperView Neo-2 (SVN2) is a Synthetic Aperture Radar Interferometry (InSAR) satellite mission from China that employs agile satellite platforms with advanced attitude maneuver capabilities. This presents a significant challenge for GPS-based precise orbit and baseline determination (POD and PBD), which are essential for InSAR applications. To achieve high-quality POD and PBD solutions, each satellite carries dual GPS antennas: one vertical and one tilting antenna. To evaluate the effectiveness of the dual-antenna system, two sets of orbit and baseline solutions are generated: one based on the vertical antenna and the other on dual antennas. They are then assessed through formal error analysis and comparison in the orbital overlaps and between solutions. All results show significant improvements with the dual-antenna system, particularly in the PBD solutions. Specifically, the formal error analysis reveals that the dual-antenna system can provide notably improved solution precision, with the formal errors being reduced by 23% and 41% for the POD and PBD solutions, respectively. Orbital overlap analysis shows that internal solution consistency better than 0.9&#xa0;mm for POD and 0.3&#xa0;mm for PBD can be achieved with the dual-antenna system, which is improved by 39% and 64%, respectively, compared to the single-antenna system. Comparisons between the kinematic and dynamic solutions also demonstrate substantial improvements in inter-product consistency in the dual-antenna case, with the differences being reduced by 33% and 43% for the POD and PBD solutions, respectively. Finally, the differential POD and PBD solutions exhibit a consistency of 1.5&#xa0;mm, significantly better than the 2.7&#xa0;mm achieved with the single-antenna system. These results collectively demonstrate that the dual-antenna GPS system provides significantly improved POD and PBD solutions for the SVN2 satellites. This study can provide a reference for LEO missions that employ agile satellite platforms and rely on dual-antenna-based POD and/or PBD.</p>

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Precise orbit and baseline determination with dual GPS antennas for the SuperView Neo-2 satellite

  • 期刊论文

  • 发表日期：

    2025年3月23日

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  • Xiang Guo,
  • Yidu Lian,
  • Jiale Liu

摘要

The SuperView Neo-2 (SVN2) is a Synthetic Aperture Radar Interferometry (InSAR) satellite mission from China that employs agile satellite platforms with advanced attitude maneuver capabilities. This presents a significant challenge for GPS-based precise orbit and baseline determination (POD and PBD), which are essential for InSAR applications. To achieve high-quality POD and PBD solutions, each satellite carries dual GPS antennas: one vertical and one tilting antenna. To evaluate the effectiveness of the dual-antenna system, two sets of orbit and baseline solutions are generated: one based on the vertical antenna and the other on dual antennas. They are then assessed through formal error analysis and comparison in the orbital overlaps and between solutions. All results show significant improvements with the dual-antenna system, particularly in the PBD solutions. Specifically, the formal error analysis reveals that the dual-antenna system can provide notably improved solution precision, with the formal errors being reduced by 23% and 41% for the POD and PBD solutions, respectively. Orbital overlap analysis shows that internal solution consistency better than 0.9 mm for POD and 0.3 mm for PBD can be achieved with the dual-antenna system, which is improved by 39% and 64%, respectively, compared to the single-antenna system. Comparisons between the kinematic and dynamic solutions also demonstrate substantial improvements in inter-product consistency in the dual-antenna case, with the differences being reduced by 33% and 43% for the POD and PBD solutions, respectively. Finally, the differential POD and PBD solutions exhibit a consistency of 1.5 mm, significantly better than the 2.7 mm achieved with the single-antenna system. These results collectively demonstrate that the dual-antenna GPS system provides significantly improved POD and PBD solutions for the SVN2 satellites. This study can provide a reference for LEO missions that employ agile satellite platforms and rely on dual-antenna-based POD and/or PBD.