GTD 6.2.10

8.2. Observation points

If the user selects the Observation Points option (only available when the Near Field or Doppler simulation types is selected), the following panel will appear:

 

Observation points panel

 

The user can select near field observation points in different ways. The next options are available:

  • Geometry Types: observation points may be inserted as a group that defines different shapes. Select the desired type entity and click on Add button to set its parameters. The available Geometry Types are detailed in next subsections. Before adding new elements, check that the Name of the new entity to be added is different from the already existing ones; otherwise, an error will be shown.
  • Observation points: this section contains several options to work with observation points.
    • The left list contains all the observation shapes that have been added as observation points. 
    • The Edit button allows editing an observation points shape selected on the left list.
    • The Delete button allows removing the observation entities selected on the left list.
    • Use the Delete All button to remove all the observation points shapes on the left list.
    • The Export as Text button allows saving all the generated observation points. Every point is defined in a different line by its X, Y and Z coordinates.
    • The Import File allows the user to add a previously saved observation points file. Only .obs files are supported, which are the internal format generated by the application.
    • The Export File allows the user to save the current observation points configuration in a new file. It must be saved as .obs file, which is the internal format generated by the application.
    • Check the Hide observation points option to hide the observation points from the main geometry window but without deleting them. Disable this option to show the observation points.
  • Hide observation points: this option hide the observation points.

 

 

8.2.1. Cylinder

The observation cylinder may be defined as a closed cylinder (circular section) or only a cylindrical sector (arc section). The following parameters are required:

  • Name: to define the name of this type of observation points. The name must be different of the already defined ones.
  • Base Center: coordinates where the base of the cylinder will be placed (in the XY plane).
  • Radius: radius of the cylinder
  • Height Coordinates: to define the hight sampling rate of the cylinder.
    • Number of points: define the number of samples to be generated along the height of the cylinder (in the Z axis).
    • Height: defines the total height of the cylinder.
  • Angle Coordinates: to define the circular sampling rate of the cylinder. 
    • Number of points: define the number of samples to be generated along the transversal section of the cylinder (in the XY plane).
    • Initial angle: angle where the first circular sample is generated in the transversal section, in degrees.
    • Final angle:  angle where the last circular sample is generated in the transversal section, in degrees.

cylinder observation points

New Cylinder parameters 

Click on OK button to insert the observation points from the cylinder, or abort the insertion by clicking on Cancel button.

8.2.2. External File

The user can also import the near field points from a text file. This file can then be imported by selecting External File into the Geometry Types combo-box. Note that this option imports a file of points, but does not preserve the near field type (i.e. every point is imported as a separate type). In order to preserve the near field type, the Export file and Import file must be used instead. 

Open External File dialog

The external file must contain a list of points given by its X, Y and Z coordinates, with every point specified in separated lines.

Click on OK button to insert the observation points from the file, or abort the insertion by clicking on Cancel button.

8.2.3. From Curve

This option lets you select a line or curve of the main panel and sampling it as observation points. Before clicking on Add button having select the From Curve type, the curve has to be selected in the Geometry panel. As shown in the below figure, the following parametrs are required:

  • Name: to define the name of this type of observation points. The name must be different of the already defined ones.
  • Number of points: to specify the number of samples generated along the curve.

Click on OK button to insert the observation points from the curve, or abort the insertion by clicking on Cancel button.

observation points from a curve
Adding a curve of observation points

The next figure shows that the grid points are added to the Observation points list, and represented together the geometry as a dotted grid.

observation points generated from curve

 

Observation points generated on the curve

8.2.4. From Surface

This option lets you select a surface of the main panel and sample it as observation points. Before clicking on Add button having select the From Surface type, the surface has to be selected in the Geometry panel. As shown in the below figure, the following parametrs are required:

  • Name: to define the name of this type of observation points. The name must be different of the already defined ones.
  • Parameters: the generated observation entity will be a matrix of U x V points obtained by sampling the surface. 
    • U-Dimension: to specify the number of samples generated along the the U-Dimension of the surface.
    • V-Dimension: to specify the number of samples generated along the the V-Dimension of the surface.

Click on OK button to insert the observation points from the surface, or abort the insertion by clicking on Cancel button.

observation points from surface

Adding a surface of observation points

The next figure shows that the grid points are added to the Observation points list, and represented together the geometry as a dotted grid.

observation points on the surface

 

Observation points generated on the surface

8.2.5. Line

Observation points also may be generated along a virtual straight line sampled between its extremes.  As shown in the below figure, the following parametrs are required:

  • Name: to define the name of this type of observation points. The name must be different of the already defined ones.
  • Coordinates: the line is defined by its side points. 
    • Initial Point: first extreme of the straigth line.
    • Final Point: opposite extreme of the straigth line.

Click on OK button to insert the observation points from the line, or abort the insertion by clicking on Cancel button.

line observation points

New Line parameters

8.2.6. Parallelogram

Use this option to generate a parallelogram of coplanar observation points. The parameters required to its shape are:

  • Name: to define the name of this type of observation points. The name must be different of the already defined ones.
  • Coordinates: the parallalelogram is defined by three points that form its two main axis, so the generated observation entity will be a matrix of Side x Botton points obtained by sampling the parallelogram.
    • Side left axis is defined from Point 1 to Point 2.
    • Bottom axis is defined from Point 2 to Point 3.

Click on OK button to insert the observation points from the parallelogram, or abort the insertion by clicking on Cancel button.

observation points parallelogram

New Parallelogram parameters

8.2.7. Plane

In this window, the user can create a set of observation points laid out in a grid pattern. To do so, the user needs to specify several parameters:

  • Name: A short name that will be used by the user to identify the created set of observation points.
  • Constant axis: The normal axis of the plane that will contain the grid of observation points.
  • Coordinate value: Value of the coordinate of the axis specified in the previous option.

For each of the axes different than the one selected in the Constant axis drop-down list, the user needs to specify the following parameters:

  • Initial value: Initial value of the coordinate along each axis.
  • Total size: The total length of the grid of observation points along the axis.
  • Number of points: The number of observation points along the axis.

Note: The spacing between each pair of consecutive observation points along an axis will be given by the formula spacing = (total size) / (number of points - 1). This value will be shown next to the label "Distance btw. points".

Adding a plane of observation points

New Plane parameters

8.2.8. Point

Isolated observation points may be generated by using this option. The parameters to specify are:

  • Name: to define the name of the observation point. The name must be different of the already defined ones.
  • Coordinates: position of the observation point, specified by its X, Y and Z coordinates.

Observation point

New Point parameters

Click on OK button to insert the observation point, or abort the insertion by clicking on Cancel button.

8.2.9. Sphere

The observation sphere may be defined as a full closed sphere or only an spherical sector specified. Multiple concentric spheres (or spherical sectors) may be defined within the same entity. The following parameters are required:

  • Name: to define the name of this type of observation points. The name must be different of the already defined ones.
  • Parameters:
    • Center Point: X, Y and Z coordinates where the sphere will be centered on.
    • Radius: radius of the sphere. A radius sweep may be defined to generate multiple concentrical spheres.
      • Initial Radius: radius of the first generated sphere, which is the only one if the sweep is not configured.
      • Increment Radius: step between two adjacent spheres. It is only considered when the sweep is configured.
      • Radius Samples: number of concentric spheres to be generated, it must be an integer number. The radius sweep is enabled when this parameter is higher than 1.
    • Theta Coordinates: to set the spherical range where te observation points are generated, in theta dimension.
      • Number of points: defines the number of samples to be taken in theta dimension along the specified angular range.
      • Initial angle: defines the angular angle (in degrees)  of the first theta point to be generated.
      • Final angle: defines the angular angle (in degrees)  of the last theta point to be generated.
    • Phi Coordinates:  to set the spherical range where te observation points are generated, in phi dimension.
      • Number of points: defines the number of samples to be taken in phi dimension along the specified angular range.
      • Initial angle: defines the angular angle (in degrees)  of the first phi point to be generated.
      • Final angle: defines the angular angle (in degrees)  of the last phi point to be generated.

The total number of observation points to be generated in the sphere is: (Radius Samples) x (Number of Points)Theta x (Number of Points)Phi.

Observation points sphere

 Spherical observation points.

Click on OK button to insert the observation points from the sphere, or abort the insertion by clicking on Cancel button.

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