scholarly journals Risk-Aware Wireless Positioning in Maritime Environment

2019 ◽  
Vol 9 (10) ◽  
pp. 2107
Author(s):  
Keun Young Seok ◽  
Jong Yeol Ryu ◽  
Jung Hoon Lee
Keyword(s):  
Facility Management ◽  
Ocean Current ◽  
Signal Frequency ◽  
Average Risk ◽  
Power Budget ◽  
Position Information ◽  
Wireless Location ◽  
Wireless Positioning ◽  
Wireless Communications Systems ◽  
Maritime Environment

The evolution of wireless communications systems has promoted various applications that require user positions in various environments including indoor, maritime and aerial environments. This progress has also brought advanced wireless location tracking (i.e., positioning) schemes for many purposes such as military, accident prevention and facility management. In this paper, we propose a risk-aware wireless positioning scheme, where the position information is required for safety. Especially for the maritime environment, we model the risk of the user at each position as a function of location accuracy, geometry, ocean current speed and so forth. Considering the power budget of each user, we optimize the user’s wireless positioning signal frequency (i.e., the positioning signal broadcasting rate) at each position so that our positioning scheme can minimize the average risk for each user.

scholarly journals Experiences with the GPS in Unstabilized CubeSat

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Pavel Kovar
Keyword(s):  
Experimental Data ◽  
Signal Acquisition ◽  
Gps Receiver ◽  
Small Satellite ◽  
Power Budget ◽  
Successful Operation ◽  
Polar Orbit ◽  
Position Information ◽  
Space Experiments ◽  
Satellite Rotation

The paper summarizes the experiences with the operation of the piNAV GPS receiver in a 1U unstabilized CubeSat operated on LEO orbit. piNAV L1 is a GPS receiver developed by an author for small satellite missions. The receiver is equipped with the 15 GPS L1 C/A channels and acquisition accelerator that shortens the cold start of the receiver on LEO to 65 s. The typical power consumption is 120 mW. Lucky-7 is a private 1U technological CubeSat with power budget 1 W that operates on the quasisynchronous polar orbit at altitude 520 km. One of its scientific missions is to test the operation of GPS. The space experiments proved the successful operation of the GPS receiver. The position information was available for approximately 80% of the time, where the position outage was caused by a satellite rotation and relatively long navigation signal reacquisition. The experimental data proved that the position availability can be improved by a higher-performance signal acquisition engine.

Precision Wireless Positioning Scheme in Small Range Based on First-Order Difference and Correlation Inspection

2013 ◽  
Vol 6 (3) ◽  
pp. 1-15 ◽  
Author(s):  
Zhengping Li ◽  
Ziren Wang ◽  
Yongmei Zhang ◽  
Li Ma
Keyword(s):  
Matched Filter ◽  
Development Trend ◽  
Small Range ◽  
Positioning System ◽  
Signal Source ◽  
Order Difference ◽  
Wireless Location ◽  
First Order ◽  
Positioning Method ◽  
Wireless Positioning

This paper made analysis of present situation and development trend of the positioning in small range at first and then made summary about the technologies and algorithms of the positioning in small range. According to the above content, wireless location technology has broad application prospects, especially the applications related to the location in small range. This new wireless positioning scheme mainly aims at improving the positioning method based on time difference of arrival (TDOA) in small range. This paper designs an improved positioning system which uses matched filter to calculate TDOA value. Then the system estimated the position of signal source by Chan's algorithm and used the first-order difference method to optimize the positioning results. From the simulation results by Matlab, it can be seen that this improved positioning system has improved the positioning accuracy and met the demand of the high precision positioning.

Digitalisierung: In fünf Schritten zum digitalen Facility-Management

2020 ◽  
Vol 25 (07/08) ◽  
pp. 74-75
Author(s):  
Eva Neumann ◽  
Oswald Neumann
Keyword(s):  
Facility Management ◽  
Diagnostik Und Therapie

Eine Digitalisierungsstrategie ist in der Krankenhausbranche unabdingbar. Optimierungspotentiale und Kosteneinsparmöglichkeiten durch digitale Prozesse sind allerdings nicht nur auf Diagnostik und Therapie beschränkt. Auch ein sinnvoll strukturiertes digitales Facility Management birgt entscheidende Vorteile.

Branche in Zahlen: Outsourcing von Facility Management Dienstleistungen

2020 ◽  
Vol 25 (07/08) ◽  
pp. 80-80
Keyword(s):  
Facility Management

Dieser Artikel ist nur als PDF-Dokument verfügbar.

GALILEO and GPS Performances in the Maritime Environment

2020 ◽  
Author(s):  
Alexandru Pandele ◽  
Antonia Croitoru ◽  
Andrei Hulea ◽  
Costel Cherciu ◽  
Alina Radutu ◽  
...  
Keyword(s):  
Maritime Environment
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