[[Image:PROP MAN8.png|thumb|left|640px|A transmitter (red) and a grid of receivers (yellow) adjusted above a plateau terrain surface. The underlying base point sets (blue and orange dots) associated with the adjusted transmitters and receivers on the terrain are also visible in the figure.]]
</td>
</tr>
</table>
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== Using EM.Terrano as an Asymptotic Field Solver ==
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Like every other electromagnetic solver, [[EM.Terrano]]'s SBR ray tracer requires an excitation source and one or more observables for the generation of simulation data. [[EM.Terrano]] offers several types of sources and observables for a SBR simulation. You already learned about the transmitter set as a source and the receiver set as an observable. You can mix and match different source types and observable types depending on the requirements of your modeling problem.
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The available source types in [[EM.Terrano]] are:
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{| class="wikitable"
|-
! scope="col"| Icon
! scope="col"| Source Type
! scope="col"| Applications
! scope="col"| Restrictions
|-
| style="width:30px;" | [[File:transmitter_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Transmitter Set | Transmitter Set]]
| style="width:250px;" | Modeling realsitic antennas & link budget calculations
| style="width:250px;" | Requires to be associated with a base location point set
|-
| style="width:30px;" | [[File:hertz_src_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Hertzian Short Dipole Source | Hertzian Short Dipole]]
| style="width:250px;" | Almost omni-directional physical radiator
| style="width:250px;" | None, stand-alone source
|}
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Click on each type to learn more about it in the [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types]].
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The available observables types in [[EM.Terrano]] are:
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{| class="wikitable"
|-
! scope="col"| Icon
! scope="col"| Source Type
! scope="col"| Applications
! scope="col"| Restrictions
|-
| style="width:30px;" | [[File:receiver_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Receiver Set | Receiver Set]]
| style="width:250px;" | Generating received power coverage maps & link budget calculations
| style="width:250px;" | Requires to be associated with a base location point set
|-
| style="width:30px;" | [[File:fieldsensor_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Near-Field Sensor | Near-Field Sensor]]
| style="width:250px;" | Generating electric and magnetic field distribution maps
| style="width:250px;" | None, stand-alone observable
|-
| style="width:30px;" | [[File:farfield_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Far-Field Radiation Pattern | Far-Field Radiation Pattern]]
| style="width:250px;" | Computing the effective radiation pattern of a radiator in the presence of a large scattering scene
| style="width:250px;" | None, stand-alone observable
|-
| style="width:30px;" | [[File:huyg_surf_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Huygens Surface | Huygens Surface]]
| style="width:250px;" | Collecting tangential field data on a box to be used later as a Huygens source in other [[EM.Cube]] modules
| style="width:250px;" | None, stand-alone observable
|}
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Click on each type to learn more about it in the [[Glossary of EM.Cube's Simulation Observables & Graph Types]].
When you define a far-field observable in [[EM.Terrano]], a collection of invisible, isotropic receivers are placed on the surface of a large sphere that encircles your propagation scene and all of its geometric objects. These receivers are placed uniformly on the spherical surface at a spacing that is determined by your specified angular resolutions. In most cases, you need to define angular resolutions of at least 1° or smaller. Note that this is different than the transmitter rays' angular resolution. You may have a large number of transmitted rays but not enough receivers to compute the effective radiation pattern at all azimuth and elevation angles. Also keep in mind that with 1° Theta and Phi angle increments, you will have a total of 181 × 361 = 65,341 spherically placed receivers in your scene.
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{{Note| Computing radiation patterns using [[EM.Terrano]]'s SBR solver typically takes much longer computation times than using [[EM.Cube]]'s other computational modules.}}
<table>
<tr>
<td> [[Image:PROP18P.png|thumb|450px|Computed 3D radiation pattern of two vertical short dipole radiators placed 1m apart in the free space at 1GHz.]] </td>
</tr>
</table>
<td> [[Image:PROP20G.png|thumb|350px|Polar stem graph of Phi angle of arrival.]] </td>
<td> [[Image:PROP20H.png|thumb|350px|Polar stem graph of Theta angle of arrival.]] </td>
</tr>
</table>
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== Using EM.Terrano as an Asymptotic Field Solver ==
Â
Like every other electromagnetic solver, [[EM.Terrano]]'s SBR ray tracer requires an excitation source and one or more observables for the generation of simulation data. [[EM.Terrano]] offers several types of sources and observables for a SBR simulation. You already learned about the transmitter set as a source and the receiver set as an observable. You can mix and match different source types and observable types depending on the requirements of your modeling problem.
Â
The available source types in [[EM.Terrano]] are:
Â
{| class="wikitable"
|-
! scope="col"| Icon
! scope="col"| Source Type
! scope="col"| Applications
! scope="col"| Restrictions
|-
| style="width:30px;" | [[File:transmitter_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Transmitter Set | Transmitter Set]]
| style="width:250px;" | Modeling realsitic antennas & link budget calculations
| style="width:250px;" | Requires to be associated with a base location point set
|-
| style="width:30px;" | [[File:hertz_src_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Hertzian Short Dipole Source | Hertzian Short Dipole]]
| style="width:250px;" | Almost omni-directional physical radiator
| style="width:250px;" | None, stand-alone source
|}
Â
Click on each type to learn more about it in the [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types]].
Â
The available observables types in [[EM.Terrano]] are:
Â
{| class="wikitable"
|-
! scope="col"| Icon
! scope="col"| Source Type
! scope="col"| Applications
! scope="col"| Restrictions
|-
| style="width:30px;" | [[File:receiver_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Receiver Set | Receiver Set]]
| style="width:250px;" | Generating received power coverage maps & link budget calculations
| style="width:250px;" | Requires to be associated with a base location point set
|-
| style="width:30px;" | [[File:fieldsensor_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Near-Field Sensor | Near-Field Sensor]]
| style="width:250px;" | Generating electric and magnetic field distribution maps
| style="width:250px;" | None, stand-alone observable
|-
| style="width:30px;" | [[File:farfield_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Far-Field Radiation Pattern | Far-Field Radiation Pattern]]
| style="width:250px;" | Computing the effective radiation pattern of a radiator in the presence of a large scattering scene
| style="width:250px;" | None, stand-alone observable
|-
| style="width:30px;" | [[File:huyg_surf_icon.png]]
| style="width:150px;" | [[Glossary of EM.Cube's Simulation Observables & Graph Types#Huygens Surface | Huygens Surface]]
| style="width:250px;" | Collecting tangential field data on a box to be used later as a Huygens source in other [[EM.Cube]] modules
| style="width:250px;" | None, stand-alone observable
|}
Â
Click on each type to learn more about it in the [[Glossary of EM.Cube's Simulation Observables & Graph Types]].
When you define a far-field observable in [[EM.Terrano]], a collection of invisible, isotropic receivers are placed on the surface of a large sphere that encircles your propagation scene and all of its geometric objects. These receivers are placed uniformly on the spherical surface at a spacing that is determined by your specified angular resolutions. In most cases, you need to define angular resolutions of at least 1° or smaller. Note that this is different than the transmitter rays' angular resolution. You may have a large number of transmitted rays but not enough receivers to compute the effective radiation pattern at all azimuth and elevation angles. Also keep in mind that with 1° Theta and Phi angle increments, you will have a total of 181 × 361 = 65,341 spherically placed receivers in your scene.
Â
{{Note| Computing radiation patterns using [[EM.Terrano]]'s SBR solver typically takes much longer computation times than using [[EM.Cube]]'s other computational modules.}}
<table>
<tr>
<td> [[Image:PROP18P.png|thumb|450px|Computed 3D radiation pattern of two vertical short dipole radiators placed 1m apart in the free space at 1GHz.]] </td>
</tr>
</table>