Beyond Visual and Radio Line of Sight UAVs Monitoring System Through Open Software in a Simulated Environment

2021 ◽  
pp. 629-642
Author(s):  
Miguel A. Murillo ◽  
Julio E. Alvia ◽  
Miguel Realpe
Keyword(s):  
Monitoring System ◽  
Line Of Sight ◽  
Radio Line ◽  
Simulated Environment

scholarly journals Precise Positioning of Autonomous Vehicles Combining UWB Ranging Estimations with On-Board Sensors

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1238
Author(s):  
Javier San Martín ◽  
Ainhoa Cortés ◽  
Leticia Zamora-Cadenas ◽  
Bo Joel Svensson
Keyword(s):  
Autonomous Vehicles ◽  
Research Work ◽  
Ultra Wideband ◽  
Line Of Sight ◽  
Use Case ◽  
Positioning System ◽  
Precise Positioning ◽  
Research Institutes ◽  
Simulated Environment ◽  
Non Line Of Sight

In this paper, we analyze the performance of a positioning system based on the fusion of Ultra-Wideband (UWB) ranging estimates together with odometry and inertial data from the vehicle. For carrying out this data fusion, an Extended Kalman Filter (EKF) has been used. Furthermore, a post-processing algorithm has been designed to remove the Non Line-Of-Sight (NLOS) UWB ranging estimates to further improve the accuracy of the proposed solution. This solution has been tested using both a simulated environment and a real environment. This research work is in the scope of the PRoPART European Project. The different real tests have been performed on the AstaZero proving ground using a Radio Control car (RC car) developed by RISE (Research Institutes of Sweden) as testing platform. Thus, a real time positioning solution has been achieved complying with the accuracy requirements for the PRoPART use case.

scholarly journals Radio Line and Continuum Observations of Quasar-Galaxy Pairs and the Origin of Low Redshift Quasar Absorption Line Systems

1990 ◽  
Vol 124 ◽  
pp. 473-477
Author(s):  
C.L. Carilli ◽  
J.H. van Gorkom ◽  
E.M. Hauxthausen ◽  
J.T. Stocke ◽  
J. Salzer
Keyword(s):  
Absorption Line ◽  
Alternative Hypothesis ◽  
High Redshift ◽  
Gravitational Interaction ◽  
Optical Disk ◽  
Line Of Sight ◽  
Radio Line ◽  
Redshift Galaxy ◽  
Interacting Systems ◽  
Companion Galaxy

There are a number of known quasars for which our line of sight to the high redshift quasar passes within a few Holmberg radii of a low redshift galaxy. In a few of these cases, spectra of the quasar reveal absorption by gas associated with the low redshift galaxy. A number of these pairs imply absorption by gas which lies well outside the optical disk of the associated galaxy, leading to models of galaxies with ‘halos’ or ‘disks’ of gas extending to large radii. We present observations of 4 such pairs. In three of the four cases, we find that the associated galaxy is highly disturbed, typically due to a gravitational interaction with a companion galaxy, while in the fourth case the absorption can be explained by clouds in the optical disk of the associated galaxy. We are led to an alternative hypothesis concerning the origin of the low redshift absorption line systems: the absorption is by gas clouds which have been gravitationally stripped from the associated galaxy. These galaxies are rapidly evolving, and should not be used as examples of absorption by clouds in halos of field spirals. We conclude by considering the role extended gas in interacting systems plays in the origin of higher redshift quasar absorption line systems.

scholarly journals RPAS COMMUNICATION CHANNELS BASED ON WCDMA 3GPP STANDARD

Aviation ◽  
2020 ◽  
Vol 24 (1) ◽  
pp. 42-49 ◽  
Author(s):  
Andrii Grekhov ◽  
Vasyl Kondratiuk ◽  
Svitlana Ilnytska
Keyword(s):  
Communication Channels ◽  
Base Station ◽  
Critical Conditions ◽  
Line Of Sight ◽  
Signal Noise ◽  
Radio Line ◽  
Channel Characteristics ◽  
Noise Ratio ◽  
Code Division Multiple ◽  
Different Levels

First built models of Remotely Piloted Air System (RPAS) communication channels based on Wideband Code Division Multiple Access (WCDMA) 3GPP Standard were designed. Base Station (BS) transmission within the Radio Line of Sight (RLoS) and through the satellite using Beyond Radio Line of Sight (BRLoS) was considered. The dependencies of the Bit Error Rate (BER) on the signal-noise ratio for different RPAS velocities and WCDMA сhannel models were obtained. The dependences of the BER on the signal-noise ratio for different levels of satellite transponder nonlinearity were studied. The dependence of the BER on the BS antenna diameter in case of the transponder nonlinearity was analysed. The dependencies for satellite channel characteristics, first obtained taking into account the motion of the RPAS, make it possible to predict the behavior of the communication system in critical conditions.

scholarly journals Design optimization method of line-of-sight with JACK for bulldozer operator

2018 ◽  
Vol 176 ◽  
pp. 01003
Author(s):  
GUO Mei-ni
Keyword(s):  
Virtual Environment ◽  
Monitoring System ◽  
Lower Risk ◽  
Optimization Method ◽  
Line Of Sight ◽  
Original Design ◽  
Visual Monitoring ◽  
Visual Areas ◽  
Visual Monitoring System ◽  
Coverage Zone

The objective of this article is to investigate the line-of-sight (LOS) and visual areas in order to provide a lower risk of accident and a best available view for the operator of industry machine. This paper presented a method of simulating an bulldozer operation in a virtual environment for the sake of analyzing LOS of the operator during conditions of load and unload respectively. Coverage zone tool in the JACK software was utilized to calculate the percentage of visible zones from the virtual operator’s position. At the same time, the modification of design with additional cameras was proposed based on the results of LOS analysis, which significantly improved compared with original design. The results of this study proved that the modifications (with visual monitoring system) could improve visibility of bulldozer operators to some extent according to the optimization method.

scholarly journals Sistem Pemantau Kelembapan Tanah Akurat dengan Protokol Zigbee IEEE 802.15.4 pada Platform M2M OpenMTC

2018 ◽  
Vol 6 (4) ◽  
pp. 139-145
Author(s):  
Putu Agus Fredy ◽  
Maman Abdurohman
Keyword(s):  
Soil Moisture ◽  
Wireless Sensor Network ◽  
Water Content ◽  
Monitoring System ◽  
Ieee 802.15.4 ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Line Of Sight ◽  
Zigbee Protocol ◽  
Content Status

This paper presents a study on an accurate soil moisture monitoring system based on its humidity from 9 sensor nodes using wireless sensor network (WSN) and M2M platform. The system used IEEE 802.15.4 (Zigbee) protocol. The system was connected to the application via the OpenMTC M2M platform. This monitoring system can measure soil moisture accurately and provide soil water content status on the application. The system was effective in measuring soil moisture at a distance of 0-25 meters where there was a barrier between gateway and sensor, and at a distance of 0-50 meter in line of sight. The position of the sensors that are within 3 meters of each other and the depth of each sensor 3 cm can measure soil moisture properly.

Wireless Sensor Node with Passive RFID for Indoor Monitoring System

2017 ◽  
Vol 7 (3) ◽  
pp. 1459 ◽  
Author(s):  
Norsaidah Muhamad Nadzir ◽  
M.K.A. Rahim ◽  
F. Zubir ◽  
A. Zabri ◽  
H.A. Majid
Keyword(s):  
Monitoring System ◽  
Radio Frequency Identification ◽  
Monopole Antenna ◽  
Line Of Sight ◽  
Raspberry Pi ◽  
Wireless Sensor Node ◽  
Frequency Identification ◽  
Passive Rfid ◽  
Indoor Monitoring ◽  
Non Line Of Sight

This paper discusses the development of an indoor monitoring system based on passive radio frequency identification (RFID) system and Raspberry Pi 3. There are two algorithms designed for this project where the first is to link the RFID module to the Raspberry Pi 3, and the other one is to send the data obtained to a database over wireless network via UDOO Quad as a secondary router. The result is then displayed on a localhost generated using XAMPP. The objective of this project is to realize a monitoring system that incorporates different systems such as Raspberry Pi 3, UDOO Quad, and also RFID module by designing algorithms using Python and C programming language. Plus, the performance of the system is also analyzed using different type of antennas such as the Raspberry Pi 3 Antenna, monopole antenna, and a Yagi Uda antenna in terms of power received versus distance in both line of sight position and non-line of sight position. Finally, antenna that produces the best performance for line-of-sight (LOS) propagation is Yagi Uda antenna while monopole antenna is better when it comes to non-line-of-sight (NLOS) propagation.

scholarly journals RFID Based Efficient Wireless Monitoring System

2015 ◽  
Vol 15 (3) ◽  
pp. 6585-6595
Author(s):  
Manar Khalid Ibraheem ◽  
Salih M. Al-Qaraawi ◽  
Muayad Sadik Croock
Keyword(s):  
Radio Frequency ◽  
Monitoring System ◽  
Storage Capacity ◽  
Monitoring Systems ◽  
Wireless Monitoring ◽  
Simulated Environment ◽  
Public Area ◽  
And Storage

Nowadays, surveillance has become a need in any private or public area due to the increase in the number of threats such as robberies, terrorists, and abusers. In this paper, an efficient wireless monitoring system using Radio Frequency Identity (RFID) is proposed. The aim of this system is to detect a specified target during his movement in the covered region. The efficiency of the proposed system is clearly noticed through both storage capacity and power consuming reduction. This is done by dominating the work of cameras operation when receiving a signal from the distributed detectors. The obtained results show the saving in power and storage capacity is more efficient in comparison with the traditional monitoring systems. This work has two implemented sides; hardware and simulated environment that using Microsoft visual studio (C# framework).

First results after the deployment of a subsea geodetic monitoring system

2021 ◽  
Author(s):  
Pierre-François Adam ◽  
Nathalie Olivier ◽  
David Jaouen
Keyword(s):  
Velocity Profile ◽  
Monitoring System ◽  
Active Faults ◽  
Monitoring Program ◽  
Line Of Sight ◽  
Tectonic Plates ◽  
Sound Velocity Profile ◽  
The North ◽  
First Results

<p>Geodetic networks at sea are necessary to monitor active faults and the long term displacement of tectonic plates. iXblue has developed a new integrated subsea monitoring system: Canopus</p><p>The Canopus transponders are enable to regularly measure precisely the distance between the transponders that are in acoustic line of sight. The measurement are stored in a memory inside each beacon and can be collected from surface using acoustic modem. In collaboration with the IUEM, and in the framework of ERC Focus project, 8 Canopus beacons were deployed at each side of the North Alfeo Fault in Sicilia for a  4 years monitoring program. To prepare the deployment, a first experiment took place in Brest Bay in July 2019, and a second one in La Ciotat Bay in September 2020. Thanks to Delph subsea positioning software, simulations enable to confirm acoustic line of sight between beacons considering the local bathymetry, the sound velocity profile and the height of the transponders above the seabed. The final deployment took place in October 2020.  We present here the series of test and  simulations conducted before the final deployment and the first results after deployment.</p>

scholarly journals RPAS Satellite Communication Channel Based on IEEE 802.11b Standard

2019 ◽  
Vol 7 (1) ◽  
pp. 32-40 ◽  
Author(s):  
Andrii Grekhov ◽  
Vasil Kondratiuk ◽  
Svitlana Ilnitska
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Communication Channel ◽  
Satellite Communication ◽  
Communication Channels ◽  
Base Station ◽  
Line Of Sight ◽  
Ieee 802.11B ◽  
Radio Line ◽  
Data Rates

Abstract Original models of RPAS communication channels based on IEEE 802.11b Standard, including both Base Station transmission within the Radio Line of Sight, and through the satellite using Beyond Radio Line of Sight, were built. Dependencies of the Bit Error Rate on the Signal-Noise Ratio for different payload data rates were obtained. Transponder nonlinearity and Base Station antenna diameter impact were analysed.

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