SIRGAS reference frame realization SIR11P01

To estimate the kinematics of the SIRGAS reference frame, the Deutsches Geodätisches Forschungsinstitut (DGFI) as the IGS Regional Network Associate Analysis Centre for SIRGAS (IGS RNNAC SIR), yearly computes a cumulative (multi-year) solution containing all available weekly solutions delivered by the SIRGAS analysis centres. These cumulative solutions include those models, standards, and strategies widely applied at the time in which they were computed and cover different time spans depending on the availability of the weekly solutions. This data set corresponds to the multi-year solution SIR11P01. It is based on the combination of the weekly normal equations covering the time span from 2000-01-02 (GPS week 1043) to 2011-04-16 (GPS week 1631), when the IGS08 reference frame was introduced. It refers to ITRF2008, epoch 2005.0 and contains 230 stations with 269 occupations. Its precision was estimated to be ±1.0 mm (horizontal) and ±2.4 mm (vertical) for the station positions, and ±0.7 mm/a (horizontal) and ±1.1 mm/a (vertical) for the constant velocities. Computation strategy and results are in detail described in Sánchez and Seitz (2011). The IGS RNAAC SIR computation of the SIRGAS reference frame is possible thanks to the active participation of many Latin American and Caribbean colleagues, who not only make the measurements of the stations available, but also operate SIRGAS analysis centres processing the observational data on a routine basis (more details in http://www.sirgas.org). The achievements of SIRGAS are a consequence of a successful international geodetic cooperation not only following and meeting concrete objectives, but also becoming a permanent and self-sustaining geodetic community to guarantee quality, reliability, and long-term stability of the SIRGAS reference frame. The SIRGAS activities are strongly supported by the International Association of Geodesy (IAG) and the Pan-American Institute for Geography and History (PAIGH). The IGS RNAAC SIR highly appreciates all this support.为估算SIRGAS参考框架的运动学特征，作为SIRGAS的IGS区域网络联合分析中心（IGS Regional Network Associate Analysis Centre for SIRGAS，简称IGS RNNAC SIR）的德国大地测量研究所（Deutsches Geodätisches Forschungsinstitut，DGFI），每年都会生成一份累积（多年期）解算成果，整合SIRGAS各分析中心提供的全部可用周解算结果。此类累积解算成果采用解算当时广泛应用的各类模型、规范与策略，其覆盖的时间跨度取决于周解算成果的可获取情况。 本数据集对应SIR11P01多年期解算结果，其基于2000年1月2日（GPS周1043）至2011年4月16日（GPS周1631）时段内的周解正规方程组合而成，该时段正是IGS08参考框架引入的时期。该数据集采用国际地球参考框架2008（International Terrestrial Reference Frame 2008，ITRF2008），历元为2005.0，包含230个测站，共计269次测站观测时段。测站位置的精度估算为±1.0 mm（水平方向）与±2.4 mm（垂直方向），站点恒定运动速率的精度则为±0.7 mm/a（水平方向）与±1.1 mm/a（垂直方向）。其计算策略与研究成果详见Sánchez与Seitz（2011）发表的文献。 IGS RNNAC SIR能够完成SIRGAS参考框架的解算，有赖于众多拉丁美洲及加勒比地区同行的积极参与——他们不仅提供了测站观测数据，还常态化运行SIRGAS分析中心以处理观测数据（更多详情可访问http://www.sirgas.org）。SIRGAS所取得的成就，得益于成功的国际大地测量合作：这一合作不仅遵循并达成了具体目标，更构建起了一个永久且自主可持续的大地测量共同体，以保障SIRGAS参考框架的质量、可靠性与长期稳定性。SIRGAS的相关活动得到了国际大地测量协会（International Association of Geodesy，IAG）以及泛美地理与历史研究所（Pan-American Institute for Geography and History，PAIGH）的大力支持。IGS RNNAC SIR对上述所有支持深表谢意。