نتایج جستجو برای: سیگنال gps
تعداد نتایج: 37561 فیلتر نتایج به سال:
BACKGROUND General practitioners (GPs) can play an important role in both the prevention and management of overweight and obesity. Current general practice guidelines in the Netherlands allow room for GPs to execute their own weight management policy. OBJECTIVE To examine GPs' current weight management policy and the factors associated with this policy. METHODS 800 Dutch GPs were asked to c...
یونوسفر لایه ای از اتمسفر میباشد که از ارتفاع 60 کیلومتری تا 1000 کیلومتری سطح زمین گسترش یافته است . در این لایه، گازهای موجود به صورت یونیزه می باشند و انتشار امواج متاثر از چگالی الکترونها موجود و فرکانس موج می باشد. اثر یونوسفر روی امواج gps به صورت تاخیر کد و تقدم فاز ظاهر می شود که مقدار آن وابسته به میزان الکترونهای موجود در مسیر سیگنال و فرکانس سیگنال است . فعالیتهای خورشیدی و میدان مغن...
BACKGROUND No global positioning system (GPS) technology study has been conducted among a sample of young gay, bisexual, and other men who have sex with men (YMSM). As such, the purpose of this study was to evaluate the feasibility and acceptability of using GPS methods to understand the spatial context of substance use and sexual risk behaviors among a sample of YMSM in New York City, a high-r...
OBJECTIVE To examine the demographic changes in the cohort of general practitioners servicing residential aged-care facilities (RACFs) from 1984 to 2000. DESIGN Quantitative analysis of Medicare datasets from 1984 to 2000. PARTICIPANTS AND SETTING All GPs who provided Medicare-claimed RACF services from 1984 to 2000. MAIN OUTCOME MEASURES Aggregate data on RACF GPs by age group and sex; t...
OBJECTIVE To assess general practitioners' (GPs') information-seeking behaviour and perceived importance of sources of scientific medical information and to investigate associations with GP characteristics. DESIGN A national cross-sectional survey was distributed electronically in December 2013. SETTING Danish general practice. SUBJECTS A population of 3440 GPs (corresponding to approxima...
OBJECTIVE Personality disorders (PDs) often remain unrecognized in older adults by doctors in general practice. Therefore, this study evaluated the diagnostic accuracy of a screening instrument, the Gerontological Personality Disorder Scale (GPS), in a Dutch general-practice population of older adults. METHOD The psychometric properties of the GPS patient (GPS-pv) and informant (GPS-iv) versi...
Next generation GPS receivers will take advantage of Spatial processing from a Controlled Reception Pattern Antenna (CRPA) and Ultra-Tightly-Coupled (UTC) and Tightly–Coupled GPS/inertial signal processing to improve their robustness to interference and their performance in a multipath environment. This introduces the potential for failure modes to be introduced into the GPS solution from the S...
The ephemeris data format of legacy GPS receivers is improper for positioning stationary pseudolites on the ground. Therefore, to utilize pseudolites for navigation, GPS receivers must be modified so that they can handle the modified data formats of the pseudolites. Because of this problem, the practical use of pseudolites has so far been limited. This paper proposes a pseudolite-based position...
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...
با توجه به گسترش روزافزون استفاده از تکنیکهای تعیین موقعیت ماهوارهای خصوصاً gps لزوم تعیین دقیق ژئوئید باهدف جایگزینی اندازه گیریهای ترازیابی با اندازه گیریهای gps در کاربردهای ژئودتیک بر کسی پوشیده نیست. تقریب ژئوئید با استفاده از داده های gps/leveling به صورت محلی، در کنار مدل های موجود از قبیل مدلهای ژئوپتانسیل و یا ژئوئیدهای گراویمتری راهکاری پذیرفته شده است. اما سوال مهم سطح دقت قابل دسترس ...
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