Stability of VLBI, SLR, DORIS, and GPS positioning
نویسندگان
چکیده
منابع مشابه
The Integration of Collocated GPS, VLBI and SLR Results
In recent years space geodetic techniques such as the Global Positioning System (GPS), Very Long Baseline Interferometry (VLBI), and Satellite Laser Ranging (SLR) have been collocated to address many applications in geoscience. While results from all these techniques are contaminated by various biases and errors, a commonmode signal has been found among the collocated results of GPS, VLBI and S...
متن کاملکنترل فرونشست دشت مشهد و نیشابور بر مبنای روش تجزیه و تحلیل تغییر انحنابا استفاده از میدان جابه‌جایی حاصل از مشاهدات GPS
مدل‌سازی هندسی تغییرشکل رویه زمین با استفاده از معیارهای متفاوتی مانند تنسور تغییر شکل نوع اول (تنسور تغییر متریک یا همان تنسور کرنش)، تنسور دوران خطی و تنسور تغییر شکل نوع دوم (تنسور تغییر انحنا) با منابع گوناگون اطلاعاتی (GPS, DORIS, SLR, VLBI, Levelling) انجام می‌شود. در این پژوهش تنسور تغییر انحنا و کمیت‌های ناوردای حاصل از آن، تغییر انحنای متوسط و تغییر انحنای گوس در نگرش لاگرانژی با استفا...
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One important prerequisite for geodetic Very Long Baseline Interferometry (VLBI) is the use of frequency standards with excellent short term stability. This makes VLBI stations, which are often co-located with Global Navigation Satellite System (GNSS) receiving stations, interesting for studies of timeand frequency-transfer techniques. We present an assessment of VLBI time-transfer based on the...
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For decades the global positioning system (GPS) has been the only space geodetic technique routinely used for inter-continental frequency transfer applications. In the past very long baseline interferometry (VLBI) has also been considered for this purpose and the method’s capabilities were studied several times. However, compared to GPS current VLBI technology only provides few observations per...
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It has been considered a fact that GPS performs too poorly inside buildings to provide usable indoor positioning. We analyze results of a measurement campaign to improve on the understanding of indoor GPS reception characteristics. The results show that using state-of-the-art receivers GPS availability is good in many buildings with standard material walls and roofs. The measured root mean squa...
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ژورنال
عنوان ژورنال: Earth, Planets and Space
سال: 2007
ISSN: 1880-5981
DOI: 10.1186/bf03352712