نتایج جستجو برای: gps تفاضلی

تعداد نتایج: 33580  

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...

2012
Marco H Blanker Marlies Koerhuis-Roessink Siebe J Swart Wouter WA Zuurmond Agnes van der Heide Roberto SGM Perez Judith AC Rietjens

BACKGROUND Little is known about pressure from patients or relatives on physician's decision making of continuous palliative sedation. We aim to describe experienced pressure by general practitioners (GPs) in cases of continuous sedation after the introduction of the Dutch practice guideline, using a questionnaire survey. METHODS A sample of 918 Dutch GPs were invited to fill out a questionna...

2017
Vincent A. van Vugt Patria M. Diaz Nerio Johannes C. van der Wouden Henriëtte E. van der Horst Otto R. Maarsingh

OBJECTIVE To investigate the use of canalith repositioning manoeuvres and vestibular rehabilitation (VR) by GPs and to assess reasons for not using these techniques in patients with vertigo. DESIGN Online survey. SETTING GPs in the western and central part of the Netherlands. SUBJECTS AND METHOD Of GPs, 1169 were approached to participate in the survey. A sample of 426 GPs filled out the ...

2011
Jiwon Seo Yu-Hsuan Chen David S. De Lorenzo Sherman C. Lo Per K. Enge Dennis M. Akos Jiyun Lee

Due to their weak received signal power, Global Positioning System (GPS) signals are vulnerable to radio frequency interference. Adaptive beam and null steering of the gain pattern of a GPS antenna array can significantly increase the resistance of GPS sensors to signal interference and jamming. Since adaptive array processing requires intensive computational power, beamsteering GPS receivers w...

2017
Elizabeth Cottrell Nadine E Foster Mark Porcheret Trishna Rathod Edward Roddy

OBJECTIVES The aim of this study was to investigate general practitioners' (GPs) attitudes, beliefs and behaviours regarding the use of exercise for patients with chronic knee pain (CKP) attributable to osteoarthritis. SETTING Primary care GPs in the UK. PARTICIPANTS 5000 GPs, randomly selected from Binley's database, were mailed a cross-sectional questionnaire survey. OUTCOME MEASURES GP...

Journal: :BMC Public Health 2008
Jane S Hocking Rhian M Parker Natasha Pavlin Christopher K Fairley Jane M Gunn

BACKGROUND Australia is considering implementing a chlamydia screening program in general practice. The views of general practitioners (GPs) are necessary to inform the design of the program. This paper aimed to investigate Australian GPs' views on how chlamydia screening could work in the Australian context. METHODS This project used both qualitative interviews and a quantitative questionnai...

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...

خسرو خواجه (مترجم)

کاربرد وسیع GPS با موفقیت زیادى توأم بوده و هم اکنون نیز به یک ابزار3D حقیقى تکامل یافته است. بنابراین، عمده تلاشى که تکمیل یک طرح یا پروژه GPS به آن نیاز دارد و غالبا صرف مسائل ارتفاع ‏یابى مى‏گردد. این مقاله محدودیت‏ هاى ارتفاع یابى GPS از جمله اندازه‏ گیرى GPS، مسائل ژئوئید و سطح مبنا (datum) را مورد بررسى قرار مى­ دهد. سپس امکانات ارتفاع‏ یابى GPS با نظرى به سه کاربرد کنترل تغییر شکل، نقشه ...

Journal: :international journal of electrical and electronics engineering 0
narjes davari department of electrical and computer engineering isfahan university of technology asghar gholami department of electrical and computer engineering isfahan university of technology mohammad shabani department of eelectrical and computer engineering isfahan university of technology

accuracy of inertial navigation system (ins) is limited by inertial sensors imperfections. before using inertial sensors signals in the data fusion algorithm, noise removal method should be performed, in which, wavelet decomposition method is used. in this method the raw data is decomposed into high and low frequency data sets. in this study, wavelet multi-level resolution analysis (wmra) techn...

2006
Shuanggen Jin J. U. Park J. L. Wang B. K. Choi P. H. Park

Nowadays GPS is widely used to monitor the ionosphere. However, the current results from ground-based GPS observations only provide some information on the horizontal structure of the ionosphere, and are extremely restricted in mapping its vertical structure. In this paper, tomography reconstruction technique was used to image 3D ionospheric structure with ground-based GPS. The first result of ...

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