نتایج جستجو برای: مشاهدات ایستگاه های دایم gnss

تعداد نتایج: 490459  

Geomagnetic storms are one of the main causes of ionospheric perturbations in different sizes, depending on their intensity, which could disturb radio signals passing through this medium. On September 6-12, 2017, the sudden storm commencement (SSC) was the most massive geomagnetic storm of the year due to the X9 solar flare caused by a coronal mass ejection (CME). IMF-Bz and Dst values increase...

Journal: : 2022

هدف: هدف از پژوهش حاضر مقایسۀ واکنش ­پذیری هیجانی و نظریه ذهن کودکان بر اساس سبک ­های ابرازگری مادرانشان بود. روش: روش توصیفی نوع علّی-مقایسه­ ای بود در دو گام به صورت آنلاین انجام رسید. ابتدا با استفاده نمونه ­گیری دسترس، تعداد 105 نفر مادرانی که نمرات آن­ها هر یک پرسشنامه کینگ امونز (1990)، دوسوگرایی (1990) کنترل راجر نشوور (1987) انحراف استاندارد بالاتر میانگین دست آمد (در گروه 35 نفر) دوم وا...

2011
Alison K. Brown

Recent advances in the US GPS constellation have resulted in additional signals being made available for both military and civil applications. The modernized GPS signal structure now includes signals broadcast on three frequencies with both the legacy GPS modulation codes, additional civilian codes, and also additional military codes on L1 and L2. In the next few years, GNSS users will also be ...

2015
Harri Kaartinen Juha Hyyppä Mikko Vastaranta Antero Kukko Anttoni Jaakkola Xiaowei Yu Jiri Pyörälä Xinlian Liang Jingbin Liu Risto Kaijaluoto Timo Melkas Markus Holopainen Hannu Hyyppä Eric J. Jokela

A harvester enables detailed roundwood data to be collected during harvesting operations by means of the measurement apparatus integrated into its felling head. These data can be used to improve the efficiency of wood procurement and also replace some of the field measurements, and thus provide both less costly and more detailed ground truth for remote sensing based forest inventories. However,...

ژورنال: محیط زیست طبیعی 2012
محمد دهدار درگاهی محمود کرمی, منا حمزه پور,

مدل نمایه مطلوبیت زیستگاه برای شنگ معمولی نخستین بار به کار می رود. شنگ گونه ای شناساگر برای اکوسیستم‌های غیرآلوده و از این نظر گونه ای با اهمیت است. در این مطالعه، مدل مطلوبیت زیستگاه شنگ با در نظر گرفتن نیازمندی‌های زیستی جانور و متغیرهای محیطی که گونه به آنها وابسته است ارائه شده است. این مطالعه در رودخانه شنرود در منطقه شکار ممنوع دیلمان-درفک در استان گیلان به انجام رسید. مدل نمایه مطلوبیت ...

2010
PAtrIck roBertSoN MIchAeL ANgerMANN BerNhArD krAch

Digital cartography and automated mapping techniques based on GNSS positioning have transformed our relationship to the physical world. The convergence of these complementary technologies are supporting the growth of commercial and consumer location-based applications that benefit from the coupling of real-time information with maps that are more current than ever — at least in environments tha...

2000
P. J. G. Teunissen

Successful integer estimation of carrier phase ambiguities of Global Navigation Satellite Systems (GNSS) is the key to many high precision positioning applications. In order to describe the quality of the positioning results rigorously, one needs to know the probabilistic properties of both the integer and noninteger parameters in the GNSS model. In this contribution these probability distribut...

Journal: :Remote Sensing 2017
Chuang Qian Hui Liu Jian Tang Yuwei Chen Harri Kaartinen Antero Kukko Lingli Zhu Xinlian Liang Liang Chen Juha Hyyppä

Forest mapping, one of the main components of performing a forest inventory, is an important driving force in the development of laser scanning. Mobile laser scanning (MLS), in which laser scanners are installed on moving platforms, has been studied as a convenient measurement method for forest mapping in the past several years. Positioning and attitude accuracies are important for forest mappi...

2017
Grzegorz Nykiel Yevgen M. Zanimonskiy Yuri M. Yampolski Mariusz Figurski

The technique of the orthogonal projection of ionosphere electronic content variations for mapping total electron content (TEC) allows us to visualize ionospheric irregularities. For the reconstruction of global ionospheric characteristics, numerous global navigation satellite system (GNSS) receivers located in different regions of the Earth are used as sensors. We used dense GNSS networks in c...

2014
Jin-Hoon Choi Won-Hee Ryu Kyusung Park Jeong-Dai Jo Sung-Moo Jo Dae-Soon Lim Il-Doo Kim

Self-aggregated Li4Ti5O12 particles sandwiched between graphene nanosheets (GNSs) and single-walled carbon nanotubes (SWCNTs) network are reported as new hybrid electrodes for high power Li-ion batteries. The multi-layer electrodes are fabricated by sequential process comprising air-spray coating of GNSs layer and the following electrostatic spray (E-spray) coating of well-dispersed colloidal L...

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