Achievements and Challenges of SIRGAS
Achievements and Challenges of SIRGAS
复制标题
SIRGAS 的成就与挑战
DOI：
10.1007/978-3-642-00860-3_25
复制
发表时间：
2009
影响因子：
4.4
通讯作者：
C. Brunini
中科院分区：
文献类型：
--
作者：
L. Sánchez;C. Brunini
SIRGAS是美洲的地心参考系统。它的定义与IERS国际地球参考系统相对应，并通过IERS国际地球参考框架的区域密集化来实现。SIRGAS的活动由三个工作组协调：SIRGAS-WGI（参考系统）致力于在ITRF内建立和维护一个全大陆的地心参考框架。这一目标最初是通过1995年和2000年的两次大陆全球定位系统活动实现的，这两次活动分别包括58个和184个台站。今天，约有130个持续运行的全球导航卫星系统站点实现了这一目标，这些站点每周由IGS SIRGAS区域网络协理分析中心（IGSRNAAC-SIR）进行处理。SIRGAS-WGII（地心基准）主要负责实现各个国家的SIRGAS大地基准，该基准由SIRGAS系统的原点，方向和比例以及GRS 80椭球体的参数给出。SIRGAS-第二工作组正集中精力通过在拉丁美洲和加勒比国家增加该大陆网络的国家密度来促进和支持采用SIRGAS。SIRGAS-WGIII（垂直基准）致力于在全球框架内定义和实现统一的垂直参考系统。其核心目的是将所有国家的地球势数（或物理高度）引用到同一个等位面（W 0），该等位面必须在全球范围内定义。这也包括将现有高度基准转换为新系统。
SIRGAS is the geocentric reference system for the Americas. Its definition corresponds to the IERS International Terrestrial Reference System (ITRS) and it is realized by a regional densification of the IERS International Terrestrial Reference Frame (ITRF). The SIRGAS activities are coordinated by three working groups: SIRGAS-WGI (Reference System) is committed to establish and maintain a continental-wide geocentric reference frame within the ITRF. This objective was initially accomplished through two continental GPS campaigns in 1995 and 2000, comprising 58 and 184 stations, respectively. Today, it is realized by around 130 continuously operating GNSS sites, which are processed weekly by the IGS Regional Network Associate Analysis Centre for SIRGAS (IGSRNAAC-SIR). SIRGAS-WGII (Geocentric Datum) is primarily in charge of realising the SIRGAS geodetic datum in the individual countries, which is given by the origin, orientation and scale of the SIRGAS system, and the parameters of the GRS80 ellipsoid. SIRGAS-WGII is concentrating on promoting and supporting the adoption of SIRGAS in the Latin American and Caribbean countries by means of national densifications of the continental network. SIRGAS-WGIII (Vertical Datum) is dedicated to the definition and realization of a unified vertical reference system within a global frame. Its central purpose is to refer the geopotential numbers (or physical heights) in all countries to one and the same equipotential surface (W0), which has to be defined globally. This includes also the transformation of the existing height datums into the new system.