scholarly journals RADIO-WAVES REFLECTION AT REMOTE SENSING OF UNDERLYING COVERS

2019 ◽  
Vol 22 (3) ◽  
pp. 57-66
Author(s):  
L. P. Ligthart ◽  
A. I. Kozlov ◽  
A. I. Logvin ◽  
I. V. Avtin
Keyword(s):  
Remote Sensing ◽  
Complex Permittivity ◽  
Complex Dielectric Constant ◽  
Radio Waves ◽  
Soil Composition ◽  
Main Method ◽  
Monitoring Task ◽  
Matching Layer ◽  
Monitoring Technologies ◽  
Parabolic Layer

Monitoring technologies are rapidly developing at present and allow to extract and use non-coordinate information about objects. Noncoordinate information is the information about the type and properties of an object under study. Remote sensing is the main method of solving monitoring problems where special positioning belongs to the radar methods, based on space-time processing of signals and, in particular, on methods of radio polarimetry. It is necessary to have information about the surface in order to solve the monitoring task. The slightest changes in the electrical and physical properties of such areas as salinity, humidity, soil composition, etc. will lead to a change in the basic electrodynamics of the surface, notably its complex dielectric permittivity. The article demonstrates the precise solutions to the problems of radio-waves reflection from a layered surface with various laws of changes of the complex permittivity  in depth. Media with exponential and quadratic laws of variation  for arbitrary angles of incidence of the radio wave on the surface are considered. Precise decision is obtained for layered media with the law of change in the complex permittivity the polynomial and linear characteristics. A similar problem for the parabolic layer is considered separately. The detailed analysis of radio waves reflection from the medium with a matching layer is carried out. The nature of the electromagnetic field inside the transition layer is studied in detail. The article is illustrated by the graphs showing the dependences of an electromagnetic wave reflection coefficient on the layered medium with linear and exponential laws of variation of the complex dielectric constant over depth.

Pursuing Forecasts of the Behavior and Arrival of Coronal Mass Ejections through Modeling and Observations

2017 ◽  
Vol 13 (S335) ◽  
pp. 58-64 ◽  
Author(s):  
Hebe Cremades
Keyword(s):  
Remote Sensing ◽  
Coronal Mass Ejections ◽  
Empirical Models ◽  
Time Of Arrival ◽  
Data Sets ◽  
Radio Waves ◽  
Weather Forecasts ◽  
The Past ◽  
Increasing Demand ◽  
Solar Disturbances

AbstractSophisticated instrumentation dedicated to studying and monitoring our Sun’s activity has proliferated in the past few decades, together with the increasing demand of specialized space weather forecasts that address the needs of commercial and government systems. As a result, theoretical and empirical models and techniques of increasing complexity have been developed, aimed at forecasting the occurrence of solar disturbances, their evolution, and time of arrival to Earth. Here we will review groundbreaking and recent methods to predict the propagation and evolution of coronal mass ejections and their driven shocks. The methods rely on a wealth of data sets provided by ground- and space-based observatories, involving remote-sensing observations of the corona and the heliosphere, as well as detections of radio waves.

Remote Monitoring Technologies of Performances of Battery Charger in Digitalized Transformer Substation

2013 ◽  
Vol 662 ◽  
pp. 731-735
Author(s):  
Pei Ying Li ◽  
Yu Tian Pan ◽  
Yan Qiang Ma
Keyword(s):  
Remote Sensing ◽  
Power System ◽  
Remote Monitoring ◽  
Constant Current ◽  
Battery Charger ◽  
Monitoring Technology ◽  
Dc Power ◽  
Transformer Substation ◽  
The Stability ◽  
Monitoring Technologies

In the DC power system of the unwatched transformer substation, the battery charger is one of the key devices. The stability of its performances directly affect the stability of DC power system. In the paper, using the computer technologies and the real-time Ethernet technology to communicate with the battery charger monitor to achieve remote monitoring technology of the performances of the battery charger. It can not only remote monitor the operations and fault states of the battery charger on line, but also remote sensing the ripple factor and the stabilized voltage precision when the battery charger is under the states of the floating charge and the constant voltage equalizing charge, at the same time remote sensing the stabilized current precisions when the battery charger is under the stage of constant current equalizing charge, and the characteristics of equalizing current when the battery charger is in operation. So the remote monitoring technology of the performances of the battery charger is very important in the transformer substation.

MONITORING OF COASTAL ECOSYSTEMS BY METHOD OF REMOTE SENSING IN THE SHORT-WAVE RANGE OF RADIO WAVES

2017 ◽  
Author(s):  
Sergej Belov ◽  
Sergej Belov ◽  
Ija Belova ◽  
Ija Belova ◽  
Stepan Falomeev ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Comparative Analysis ◽  
Short Wave ◽  
Coastal Ecosystems ◽  
Relative Accuracy ◽  
New Method ◽  
Radio Waves ◽  
Signal Noise ◽  
Order Of Magnitude ◽  
Wave Range

A new method for estimating the parameter noncoherent signal/noise K of ionospheric signal is offered. A comparative analysis is carrying out. This new method exceeds an order of magnitude widely used standard one by analytical (relative) accuracy of determining a parameter K. It has the same order as the well-known coherent methodology.

scholarly journals Research on Monitoring the Wetland Landcover Change Based on the Moderate Resolution Remote Sensing Image

2015 ◽  
Vol XL-7/W3 ◽  
pp. 563-567
Author(s):  
M Zhou ◽  
X. Yuan ◽  
L. Sun
Keyword(s):  
Remote Sensing ◽  
Satellite Image ◽  
Remote Sensing Image ◽  
Main Method ◽  
Landcover Change ◽  
Natural Reserve ◽  
Multi Temporal ◽  
Moderate Resolution ◽  
Landsat Satellite

Wetland is important natural resource. The main method to monitor the landcover change in wetland natural reserve is to extract and analyze information from remote sensing image. In this paper, the landcover information is extracted, summarized and analyzed by using multi-temporal HJ and Landsat satellite image in Zhalong natural reserve, Heilongjiang, China. The method can monitor the wetland landcover change accurately in real time and long term. This paper expounds the natural factors and human factors influence on wetland land use type, for scientific and effective support for the development of the rational use of wetlands in Zhalong natural wetland reserve.

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