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SEAMCAT Manual Table of contents
- About this Wiki
- About the STG (SEAMCAT Technical Group)
- About the source code
- Frequently Asked Questions
- How to register on TracTool?
- Tutorial videos
- Known Issues
- Disclaimer
Introduction
Main structural elements of SEAMCAT
Data elements
- SEAMCAT Data types
- Function entry dialog window
- Emissions mask dialog window
- Random distribution dialog window
- Antenna pattern dialog window
- Signal display window
- How to generate a truncated distribution?
Simulation workspace
Creating SEAMCAT scenario
- Simulation scenario and its programming
- Victim link dialog window
- Interfering link dialog window
- CDMA system dialog window
- Sharing and importing scenarios
CDMA module
- CDMA Module Overview
- CDMA Simulation Engine (CDMAE)
- CDMA system dialog window
- CDMA Link level data
- CDMA simulation algorithm
- CDMA input parameters
- CDMA output results
OFDMA module
Cognitive Radio System module
Performing a simulation
- Simulation control settings
- Running a simulation (event generation)
- Calculating probability of interference
Simulation results...
- Producing simulation report
- Logging options and Remote server
- Saving results in .csv format
Library of scenario elements
- SEAMCAT Library
- Antenna elements
- Receiver elements
- Transmitter elements
- CDMA Link level data
- Propagation model plugins
- Post processing plugins
- Setting up environment for programming plugins
- Exporting and importing a library
Special functions
Detailed algorithms
- Calculation of wanted signal (dRSS)
- Calculation of unwanted and blocking signals (iRSS)
- Calculation of overloading (iRSS)
- Calculation of intermodulation signal (iRSS)
- Interference calculation (non-CDMA/non-OFDMA)
- CDMA simulation algorithm
- OFDMA simulation algorithm
Elementary calculations
- Relative location of VR and IT (Simulation Radius)
- Relative location of transceivers within a link
- Calculation of azimuths and elevations (within a link)
- Calculation of azimuths and elevations (IT-VR path)
- Calculation of antenna gains
- Calculation of VR blocking attenuation
- Calculation of the coverage radius of a transmitter
- Calculation of IT power control gain
- Calculation of IT (unwanted) emissions
Propagation models
- Guide to propagation models in SEAMCAT
- How to test propagation model?
- ITU-R P.1546 model
- Extended Hata and Hata-SRD models
- Spherical diffraction model
- Free Space Loss model
- User-defined model (Propagation plug-in)
- JTG5-6 propagation plug-in
- SE42 propagation plug-in
- Longley Rice propagation plug-in
- Winner propagation plug-in
- IEEE 802.11 Model C (modified) plug-in
Reference annexes
- Setting antenna height, pointing azimuth and elevation
- Setting path azimuths in links
- Setting blocking attenuation of victim receiver
- Scenario consistency check
- Error and warning messages
Example Scenarios
Release to be tested by STG
How to set antenna height, pointing azimuth and elevation
The General scenario tab sheets for all participating transmitters and receivers in both victim and interfering links have the Antenna pointing selection fields, allowing user to set:
- antenna height,
- antenna pointing azimuth, and
- antenna pointing elevation.
The 'height of the antenna should correspond to its definition in the selected propagation model for that link (e.g. it might be the height above ground, effective height or height above local clutter).
The antenna pointing azimuth effectively means antenna de-pointing, i.e. angle between the direction of main beam and the direction towards the calculated position of corresponding pair transceiver of the victim or interfering link. For instance, for Vr antenna the pointing azimuth value should describe the angle between direction of Vr's antenna main beam and the path to Wt. This parameter may be used either to add certain variable parameter to the final link budget due to random de-pointing of antennas (e.g. in mobile environment), or to show deliberate de-pointing of antenna (e.g. choosing a particular gain point on the antenna directivity pattern).
The antenna pointing elevation means the same de-pointing as the above described azimuth parameter, but applied in vertical plane. In real life this parameter would correspond to the impact of antenna down-tilt. The meaning of these parameters is illustrated in the figure below:
Note 1: The plane of the figure is horizontal for the azimuth angle and vertical for the elevation angle.
Note 2: These antenna pointing azimuth and elevation angles have impact only on the ultimate antenna gain applied in calculation of the link budget, but not on the mutual physical positioning of transceivers. The latter is impacted by the Path azimuth angle parameter.
Note 3: Unless some intentional meaning of antenna de-pointing is foreseen in simulation scenario, it is recommended to always set the antenna pointing and elevation angle parameters to const=0, meaning that the main beam of the antenna is directed towards the corresponding pair transceiver in a link.
Attachments
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antennaParameter.PNG
(120.0 KB) -
added by jean-philippe 4 years ago.
