نتایج جستجو برای: gdop

تعداد نتایج: 56  

2015
Chien-Sheng Chen

To enhance the performance of location estimation in wireless positioning systems, the geometric dilution of precision (GDOP) is widely used as a criterion for selecting measurement units. Since GDOP represents the geometric effect on the relationship between measurement error and positioning determination error, the smallest GDOP of the measurement unit subset is usually chosen for positioning...

Journal: :J. Geographic Information System 2011
S. Tafazoli M. R. Mosavi

One of the most important factors affecting the precision of the performance of a GPS receiver is the relative positioning of satellites to each other. Therefore, it is essential to choose appropriate accessible satellites utilized in the calculation of GPS positions. Optimal subsets of satellites are determined using the least value of their Geometric Dilution of Precision (GDOP). The most cor...

Journal: :Navigation: journal of the Institute of Navigation 2022

Abstract The success of future lunar missions depends on quality positioning, navigation, and timing (PNT) information. Earthbound GNSS signals can be received at distances but suffer from poor geometric dilution precision (GDOP) provide no coverage the far side. This article explores design space a dedicated system in orbit by using multi-objective evolutionary algorithm framework to ...

2014
Nadali Zarei H. Azami S. Sanei M. R. Mosavi M. Malekzadeh

Geometrical dilution of precision (GDOP) concept is a powerful and widespread quantify for determining the errors resulting from satellite configuration geometry. GDOP computation is based on the complicated transformation and inversion of measurement matrices that has a time and power burden. Also, basic back propagation neural network (BPNN) is easy to fall into local minima. To overcome this...

Geometric Dilution of Precision (GDOP) is a coefficient for constellations of Global Positioning System (GPS) satellites. These satellites are organized geometrically. Traditionally, GPS GDOP computation is based on the inversion matrix with complicated measurement equations. A new strategy for calculation of GPS GDOP is construction of time series problem; it employs machine learning and artif...

هندسه ماهواره‌ها، نشان‌دهنده مکان‌های هندسی ماهواره‌های GPS است، فاکتوری که ارتباط هندسی صورت فلکی ماهواره‌های GPS را با همدیگر نشان می‌دهد، GDOP است. همه گیرنده‌ها از الگوریتم‌هایی برای انتخاب ماهواره‌ها استفاده می‌کنند، در این مقاله هدف استفاده از راهکار دسته‌بندی و تخمین فاکتور GDOP برای انتخاب زیر مجموعه بهینه ماهواره‌ها است. برای این منظور از مدل ترکیبی SVMPSO استفاده شده است. این مدل بر خ...

Journal: :EURASIP J. Wireless Comm. and Networking 2017
Weiguang Shi Xiaoli Qi Jianxiong Li Shuxia Yan Liying Chen Yang Yu Xin Feng

Cellular-based cooperative communication is a promising technique that allows cooperation among mobile devices not only to increase data throughput but also to improve localization services. For a certain number of cooperative nodes, the geometry plays a significant role in enhancing the accuracy of target. In this paper, a simple solution to the deployment of cooperative nodes aiming at the lo...

2015
Zixi Jia Chengdong Wu Zhao Li Yunzhou Zhang Bo Guan

Indoor localization is a significant research area in wireless sensor networks (WSNs). Generally, the nodes of WSNs are deployed in the same plane, i.e., the floor, as the target to be positioned, which causes the sensing signal to be influenced or even blocked by unpredictable obstacles, like furniture. However, a 3D system, like Cricket, can reduce the negative impact of obstacles to the maxi...

ژورنال: :هوش محاسباتی در مهندسی برق 0
محمد حسین رفان دانشگاه تربیت دبیر شهید رجائی عادل دمشقی دانشگاه تربیت دبیر شهید رجائی مهرنوش کمر زرین دانشگاه شهید بهشتی

هندسه ماهواره ها، نشان دهنده مکان های هندسی ماهواره های gps است، فاکتوری که ارتباط هندسی صورت فلکی ماهواره های gps را با همدیگر نشان می دهد، gdop است. همه گیرنده ها از الگوریتم هایی برای انتخاب ماهواره ها استفاده می کنند، در این مقاله هدف استفاده از راهکار دسته بندی و تخمین فاکتور gdop برای انتخاب زیر مجموعه بهینه ماهواره ها است. برای این منظور از مدل ترکیبی svmpso استفاده شده است. این مدل بر خ...

Journal: :Wireless Personal Communications 2014
Amir Tabatabaei Mohammad Reza Mosavi

Russian global navigation satellite system (GLONASS) provides civilian and military users three-dimensional position determination and navigation services as same as US global positioning system. Geometric dilution of precision (GDOP) provides a simple interpretation of positioning precision. Usual method for GLONASS GDOP calculation is matrix inversion. However this process imposes a huge calc...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید