نتایج جستجو برای: a gps
تعداد نتایج: 13439814 فیلتر نتایج به سال:
Auto-navigating of unmanned aerial vehicles (UAV) in the outdoor environment is performed by using the Global positioning system (GPS) receiver. The power of the GPS signal on the earth surface is very low. This can affect the performance of GPS receivers in the environments contaminated with the other source of radio frequency interference (RFI). GPS jamming and spoofing are the most serious a...
in this paper a practical method for tropospheric effects on gps derived coordinates in absolute mode is presented. gps observations at the permanent gps stations can be used as source of information for the modeling. the developed model is a time-dependent model and as such differs from usual tropospheric models, which are based on atmospheric parameters, i.e. temperature, pressure and humidit...
physicians awareness about Helicobacter pylori association with peptic ulcer disease (PUD)has changed the natural course of this prolonged disease.Eradication of this organism has declined the incidence of complications and recurrence of PUD significantly in recent years.the aim of this cross sectional study was to evaluate the level of knowledge,attitude and practice (KAP) of general practitio...
In this paper, we present the results of a hierarchical SLAM/GPS/INS/WLFP sensor fusion to be used in navigation system devices. Due to low quality of the inertial sensors, even a short-term GPS failure can lower the integrated navigation performance significantly. In addition, in GPS denied environments, most navigation systems need a separate assisting resource, in order to increase the avail...
background and objective : sleep disorders are common medical problems in most of the communities. however, medical students and general practitioners (gps) do not have enough information about sleep disorders. the aim of this study was to assess the level of knowledge, attitude, and practice of gps in the field of sleep disorders in iran. materials and methods : in this cross-sectional questio...
background: continuing medical education (cme) of general practitioners (gps) regarding most of the diseases, especially psychiatric disorders, is implementing worldwide to maintain and develop their knowledge, skills, and professional performance. we investigated the effects of cme on gps knowledge in the field of psychiatric disorders in dezful university of medical sciences (dums) as a newly...
The Unmanned Aerial Vehicles (UAV) positioning in the outdoor environment is usually done by the Global Positioning System (GPS). Due to the low power of the GPS signal at the earth surface, its performance disrupted in the contaminated environments with the jamming attacks. The UAV positioning and its accuracy using GPS will be degraded in the jamming attacks. A positioning error about tens of...
The Global Positioning System (GPS) and an Inertial Navigation System (INS) are two basic navigation systems. Due to their complementary characters in many aspects, a GPS/INS integrated navigation system has been a hot research topic in the recent decade. The Micro Electrical Mechanical Sensors (MEMS) successfully solved the problems of price, size and weight with the traditional INS. Therefore...
As functional integration has increased in hand-held consumer devices features such as Global Positioning System (GPS) receivers have been embedded in increasingly more devices in recent years. For example, the train positioning system based on GPS provides an integrated positioning solution which can be used in many rail applications without a cost intensive infrastructure. The network built i...
سیستم مکانیاب GPS در صورت قرار گرفتن در شرایط مناسب محیطی (مشاهده حداقل چهار ماهواره GPS با توان سیگنال دریافتی کافی)، قادر است نقاط مکانی را با دقت بالا و به طور پیوسته تولید نماید. با این حال، اغلب در مناطق شهری مانند خیابانهای با ساختمان و درختهای بلند، به دلیل کاهش توان سیگنال و چند مسیره شدن آن، نتیجه مکان تخمین زده شده توسط GPS، همواره دارای خطا است. همچنین، درزیرگذرها و تونلها، سیگنال...
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