Exploitation of the Potential of the SLR-tracked altimetry and GNSS satellites for determination of global geodetic parameters (PotS)

开发 SLR 跟踪测高和 GNSS 卫星确定全球大地测量参数 (PotS) 的潜力

• 批准号: 535929798
• 负责人: Dr.-Ing. Mathis Bloßfeld
• 金额: --
• 依托单位: Deutsches Geodätisches Forschungsinstitut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/535929798?language=en
• 关键词: Exploitation; Potential; SLR; tracked; altimetry

The main objective of this project is to investigate and exploit the potential of extending the commonly used four spherical satellite Satellite Laser Ranging (SLR) constellation by SLR-tracked non-spherical altimetry and Global Navigation Satellite System (GNSS) satellites to precisely and consistently determine global geodetic parameters. Such parameters are the coordinates of SLR stations in the global observation network, i.e., the Terrestrial Reference Frame (TRF), the origin and the scale of the TRF, Earth Rotation Parameters (ERP) and long-wavelength coefficients of the Earth’s time-variable gravity field. Taking into account two groups of non-spherical satellites, the altimetry and the GNSS satellites, this project goes beyond other studies that put their main focus on exploiting the full constellation of spherical (geodetic) satellites. Moreover, we will investigate the capability of different SLR-tracked satellite constellations (impact of specific non-spherical satellites), also in combination with Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS)-tracked satellites, to improve the above-mentioned global geodetic parameter groups in terms of accuracy, consistency and stability over time. Using a significantly increased number of observations by including observations to selected altimetry and GNSS satellites orbiting the Earth at various times, altitudes and inclinations will reduce the correlations between the estimated geodetic parameters and reduce errors of the estimated parameters. During the execution of this project, the following research questions will be answered: 1. Sensitivity: How sensitive are the global geodetic parameters to the SLR observations of each specific satellite (or groups of satellites)? 2. Precision: How precisely can the global geodetic parameters be determined and de-correlated from the analysis of SLR observations to the optimal multi-satellite (altimetry, GNSS, a combination of them, LAGEOS-1/2, and Etalon-1/2) solution compared to the conventional four-satellite setup? 3. Parameterization: What is the optimal orbit parameterization to achieve highest accuracy and stability of the global geodetic parameters? 4. Integration: What is the benefit of the integrated processing of DORIS and SLR observations in a multi-satellite solution comprising selected spherical SLR, altimetry and GNSS satellites for the determination of the global geodetic parameters? 5. Future: What is the impact of future SLR-tracked satellites on the global geodetic parameters? How should an extended space segment be designed? How can the SLR ground segment be extended to provide even more robust and accurate solutions?

该项目的主要目标是研究和利用 SLR 跟踪非球形测高和全球导航卫星系统 (GNSS) 卫星扩展常用的四颗球形卫星卫星激光测距 (SLR) 星座的潜力，以精确、一致地确定全球大地测量参数。这些参数是全球观测网络中SLR站的坐标，即地球参考系（TRF）、TRF的原点和尺度、地球自转参数（ERP）和地球时变重力场的长波长系数。考虑到两组非球形卫星（测高卫星和 GNSS 卫星），该项目超越了其他主要关注于利用整个球形（大地测量）卫星星座的研究。此外，我们将研究不同单反跟踪卫星星座的能力（特定非球形卫星的影响），并结合多普勒轨道和卫星放射定位（DORIS）跟踪卫星，以提高上述全球大地测量参数组随时间的准确性、一致性和稳定性。通过包括对选定的测高和 GNSS 卫星在不同时间绕地球运行的观测，使用显着增加的观测数量，高度和倾角将减少估计的大地测量参数之间的相关性，并减少估计参数的误差。在本项目的执行过程中，将回答以下研究问题： 1. 灵敏度：全球大地测量参数对每个特定卫星（或卫星组）的SLR观测的敏感度如何？ 2. 精度：与传统的四卫星设置相比，从 SLR 观测分析到最佳多卫星（测高、GNSS、它们的组合、LAGEOS-1/2 和 Etalon-1/2）解决方案的全球大地测量参数的确定和去相关性有多精确？ 3. 参数化：实现全球大地测量参数最高精度和稳定性的最佳轨道参数化是什么？ 4. 集成：在多卫星解决方案中集成处理 DORIS 和 SLR 观测数据（包括选定的球形 SLR、测高和 GNSS 卫星）以确定全球大地测量参数有什么好处？ 5.未来：未来的单反跟踪卫星对全球大地测量参数有何影响？延伸的空间段应该如何设计？如何扩展 SLR 地面部分以提供更强大、更准确的解决方案？