Also , vsop cannot frequently change observing object , hence it cannot supply more observations to many quasars , which are required for geodesy and geodynamics Vsop还不适合于频繁改变观测对象,所以无法提供针对多个射电源的观测量,而这正是大地测量和地球动力学所需要的。
Systematical research on the theory and methods of processing the ill - posed problems is an important task and grows to a significant subject direction in geodesy 系统研究不适定问题的处理理论和方法，是大地测量数据处理中的一项重要课题，已经发展成为一个重要的学科方向。
This paper will introduce the basic principle of mensurating astronomical longitude , latitude and azimuth angle in detail , and summarize status quo and existent problems of geodesy and astrometry 本文详细地介绍了天文经纬度和天文方位角测量的基本原理和方法，综述了天文测量目前的发展状况和存在的问题。
Some 35 years on , reflectors placed on the lunar surface are still used by scientists interested in geophysics and geodesy ( for example , how the moon ' s gravitational field shifts over time ) 35年来，放置在月球表面的反射镜依然在使用，一些对地球物理学和测地学感兴趣的科学家用它们来研究月球的引力场如何随时间变化。
An international team of scientists , working under the auspices of the f ? mi satellite geodesy observatory , hungary , has designed the gedex , for the purpose of exploring the feasibility of the geodetic applications of svlbi Misgo )的资助下,一个国际的研发小组针对svlbi在大地测量应用的可行性进行了vsop大地测量实验( gedex ) ( kulkarni等, 1998 ) 。
Applying self - organized theory of complex dynamics system , we have synthetically studied the observational results of present - day crustal movement from contemporary geodesy ( gps and earthquake crustal deformation ) in recent 40 years 摘要应用复杂动力学系统自组织理论，综合研究了近40年现代大地测量学（地震地形变及gps ）对现今地壳运动的观测结果。
The ill - posed problems include the ill - conditioned and the rank - deficient ones in geodesy , which exist widely in gps data processing , deformation analysis , geodesy inversion , gravity field continuation downward , and so on 大地测量中的不适定问题包括病态问题和秩亏问题，它广泛存在于gps数据处理、形变分析、大地测量反演、重力场向下延拓等领域。
As we know , the ill - conditioning problem is present in data processing of geodesy networks adjustment , gps ( global positioning system ) fast orientation , geodesy inversion and distortional inspecting networks . moreover , its damage is serious 病态性在常规大地测量网平差、 gps快速定位、大地测量反演以及变形监测网的数据处理中是大量存在的，其危害性十分严重。
Generally , the ill - conditioning problem not only exists in global positioning system ( gps ) data processing , surveying adjustment , observation deformation analysis and geodesy inversion , etc , but also its ill effects are very serious 在gps数据处理、工程控制网平差、形变观测分析、大地测量反演等测量数据处理领域，系统的病态性问题是常见的，并且病态性的危害作用非常严重。
Recently , according to the requirements of some important gps research subjects in the fields of geodesy , geophysics , space - physics and navigation in china , we studied systematically how to correcting the effects of the ionosphere on gps , with high - precision and accuracy 根据当前大地测量、地球物理、空间物理和导航等领域的科学研究和工程应用中的若干重要gps科研项目的需要，近年来，我们系统研究了电离层延迟的高精度模拟和改正方法。
