A Low Cost Spectral Power Extraction Technique for RF Transceiver Testing

2007 ◽  
Author(s):  
T.-L. Hung ◽  
J.-L. Huang
Keyword(s):  
Spectral Power ◽  
Low Cost ◽  
Extraction Technique ◽  
Rf Transceiver ◽  
Power Extraction

GPS Tracking System for Low Maintenance Application

2011 ◽  
Vol 403-408 ◽  
pp. 3988-3993
Author(s):  
H. Abdulaziz ◽  
N.M.K. Nik Yusoff ◽  
M.H Abu Talip
Keyword(s):  
Embedded System ◽  
Tracking System ◽  
Low Cost ◽  
Gps Tracking ◽  
Mobile Object ◽  
Gps Receiver ◽  
Rf Transceiver ◽  
Rf Communication ◽  
Gsm Network ◽  
Main Components

A GPS tracking system utilizing the license-free RF communication is proposed as viable alternative to using the available GSM network for low-cost maintenance. The proposed system is designed based on the popular 8-bit embedded system. It consists of a monitoring unit and a remote unit. Each unit is equipped with, among others, a GPS receiver and an RF transceiver as main components. While there is a need for the remote unit to be small and compact, the monitoring unit is also designed as a portable device. Prototypes are built for design verification. Initial functionality test shows that the system is capable of tracking mobile object not only in outdoor but also in indoor environment.

An implementation of low cost MIMO RF transceiver on LTE femto base station

2015 ◽  
Author(s):  
Yang Hong-tao Yang Hong-tao ◽  
Liu Ye-hui Liu Ye-hui ◽  
Yu.-E. Song ◽  
Sun She-wen Sun She-wen ◽  
Zhu He-xin Zhu He-xin
Keyword(s):  
Low Cost ◽  
Base Station ◽  
Rf Transceiver

scholarly journals GaInP/GaAs three-terminal heterojunction bipolar transistor solar cell

2021 ◽  
Author(s):  
Marius Zehender ◽  
Simon Svatek ◽  
Myles Steiner ◽  
Ivan Garcia ◽  
Pablo Garcia-Linares ◽  
...  
Keyword(s):  
Solar Cell ◽  
Low Cost ◽  
Open Circuit ◽  
Bipolar Transistor ◽  
Heterojunction Bipolar Transistor ◽  
Power Extraction ◽  
Current Voltage ◽  
Double Junction ◽  
New Perspective ◽  
Interconnecting Layers

Abstract We demonstrate a heterojunction bipolar transistor solar cell (HBTSC), a device that exhibits the performance of a double-junction solar cell in a more compact npn (or pnp) semiconductor structure. The HBTSC concept has the advantages of being a three-terminal device, such as low spectral sensitivity and high tolerance to non-optimal band-gap energies, while it has a lower fabrication and operation complexity than other multi-terminal architectures: it can produce independent power extraction from the two junctions without the need for extra isolating or interconnecting layers between them. The two junctions in our proof-of-concept HBTSC prototype, which is made of epitaxial GaInP/GaAs, exhibit independent current-voltage characteristics under AM1.5G illumination, with respective open-circuit voltages of 1.33 and 0.95 V. The HBTSC opens a new perspective in the understanding of multi-junction devices, and it is an excellent candidate for the application of low-cost fabrication techniques, and for the implementation of III-V-on-silicon tandems.

Vision Based Localization for Multiple Mobile Robots Using Low-cost Vision Sensor

2016 ◽  
Vol 7 (1) ◽  
pp. 12-25
Author(s):  
Seokju Lee ◽  
Girma Tewolde ◽  
Jongil Lim ◽  
Jaerock Kwon
Keyword(s):  
Mobile Robots ◽  
Vision System ◽  
Low Cost ◽  
Vision Sensor ◽  
Rf Transceiver ◽  
Multiple Mobile Robots ◽  
Multiple Devices ◽  
Localization Performance ◽  
Vision Based Localization ◽  
High Flexibility

This paper presents an efficient approach for a vision based localization of multiple mobile robots in an indoor environment by using a low cost vision sensor. The proposed vision sensor system that uses a single camera mounted over the mobile robots field takes advantages of small size, low energy consumption, and high flexibility to play an important role in the field of robotics. The nRF24L01 RF transceiver is connected to the vision system to enable wireless communication with multiple devices through 6 different data pipes. The downward-facing camera provides excellent performance that has the ability to identify a number of objects based on color codes, which form colored landmarks that provide mobile robots with useful image information for localization in the image view, which is then transformed to real world coordinates. Experimental results are given to show that the proposed method can obtain good localization performance in multi-mobile robots setting.

Development of low-cost image mosaics of hard-bottom sessile communities using SCUBA: comparisons of optical media and of proxy measures of community structure

2011 ◽  
Vol 92 (1) ◽  
pp. 49-62 ◽  
Author(s):  
H. van Rein ◽  
D.S. Schoeman ◽  
C.J. Brown ◽  
R. Quinn ◽  
J. Breen
Keyword(s):  
Data Collection ◽  
Low Cost ◽  
Cost Effective ◽  
Image Resolution ◽  
Extraction Technique ◽  
Hard Substratum ◽  
Image Mosaicing ◽  
Reef Community ◽  
Community Monitoring ◽  
Sampling Procedures

Underwater image-based sampling procedures, using SCUBA, are compared using imagery collected from a temperate hard-substratum community. The effectiveness of a low-budget, high-resolution image mosaicing technique is assessed by comparing the relative efficiency of data collection, extraction and analysis among sampling procedures. In addition, a manipulative experiment tested whether the sampling procedures could detect the physical removal of 10% of the reef community. Overall, four factors were explored within the data: data collection media (stills and video), cover and community composition estimation techniques (visual cover estimation, frequency of occurrence and point extraction), change detection (pre- and post-impact) and depth (8, 14, 18 and 22 m). Stills imagery sampled the reef community at a higher image resolution than the video imagery, which enabled identification of more species and less-conspicuous benthic categories. Using the visual cover estimation technique, the stills imagery also had the greatest benefit in terms of efficiency and species identification. However, the experimental impact was detected using only the point extraction technique. The recommendations are that: (1) the image mosaicing technique is applied to fixed-station monitoring; (2) the point extraction technique be used for efficient and cost-effective monitoring at coarse taxonomic resolutions; and (3) survey depths remain constant over the duration of hard-substratum community monitoring.

scholarly journals Development of a Low-Cost Arduino-Based Weather Station

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Temilola M Adepoju ◽  
Matthias O Oladele ◽  
Abdulwakil A Kasali ◽  
Gbenga J Fabiyi
Keyword(s):  
Data Collection ◽  
Data Storage ◽  
Low Cost ◽  
Data Communication ◽  
Weather Data ◽  
Weather Station ◽  
Atmospheric Conditions ◽  
Rf Transceiver ◽  
Temperature And Humidity ◽  
Arduino Uno

A weather station is a facility located either on land or sea consisting of instruments and equipment which can be used to measure atmospheric conditions so as to provide weather forecasts information and to study the weather. The existing instruments used for measuring the weather elements are expensive which led to the development of a low-cost Arduino-based weather station. The developed low-cost weather station consists of three separate modules which are data collection, data storage, and data communication. These modules communicate serially with each other and are controlled by three separate microcontrollers (Arduino Uno). The data collection module is interfaced with a set of sensors that collects temperature and humidity. The weather data were viewed in real-time through a graphical user interface (GUI) located at the central station. The developed weather station was able to measure the temperature and humidity of a controlled environment, giving the reading at interval of five minutes. It was observed that the average temperature from results obtained (27.360C) with the developed low-cost Arduino based weather station falls within the range of the Accuweather readings (24.00-28.000C). Also, the average humidity of the developed low-cost Arduino based weather station (80.41%) falls within the range of the Weatherspark humidity (78-82%) on 20th August 2019. Therefore, this system can be adopted as a weather station facility. The design can be extended to be web-based in the future to make it available worldwide.Keywords— Arduino Uno, Humidity, RF Transceiver, Temperature, Weather Station

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