CEM Workshop Lectures (7/11): PO/PTD Solver for RCS Computation

1Build-to-Specifications | Product Approval | Engineering Services | Software Development
PO/PTD solver for RCS
Computation
Simulation methodology and results
V3
Prof GR Shevare

2
©ZeusNumerixPvtLtd:ConfidentialDocument
Contents
18-Jul-2020 PO/PTD solver for RCS Computation: Zeus Numerix
 Introduction
 GUI-Overview
 Solver Inputs
 Solver Execution
 Solver Outputs
 Conclusions
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Introduction
 PO-PTD solver is designed and developed by Zeus Numerix Pvt Ltd.
 The solver is used for far field RCS calculations
 It can simulate various complex targets
 The simulation can be done for monostatic computation only
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Input Files
 A simulation requires the following input files
 Unstructured Geometry File : ‘.zeus’ format (surface triangulation)
 Edge information file (if needed)
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GUI Overview
 To begin, click on ‘PTD-GUI’ option from the setup folder
 The PTD user interface window will open which has a direct access link to the solver
along with various input fields to be entered
 The User Interface window is shown in the next slide
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GUI Overview

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Solver Inputs
 Solver requires specification of following items:
 Input mesh file
 Input edge file (if needed)
 Azimuth and Elevation (range of values)
 Frequency (GHz)
 Mesh dimensions
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User Interface Inputs Description
 The user must select a ‘project folder’. This is the folder where all result files are
generated
 The user must select the Input mesh file available in Zeus format
 If edge diffraction result is desired, the user must tick the ‘Include edge diffraction’
box and provide the edge diffraction file
 The user must then provide the range of Azimuth and Elevation for which monostatic
RCS is desired
 The user must select the meshing dimension for the Input mesh
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UI window (Inputs Entered)

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Solver Execution
 Once all the input parameters have been entered, the solver can be executed by
clicking on the ‘Run Solver’ button at the bottom left corner of the window
 The RCS results start getting generated for the selected source positions, which can
be seen on the bottom right hand side, as the solver is being executed
 Finally, once the solver execution is completed, the RCS results are generated in a file
‘rcs-final’ which is present in the folder ‘project folder’ chosen by the user
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Solver Execution

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Output Results
 After the successful completion of the simulation we will have following output files
 Monostatic RCS result file: ‘rcs-final’
 Surface currents file: ‘currents.vtk’
 Note : color plots in .vtk format can be visualized in ParaView
 The output file ‘rcs-final’ contains the monostatic RCS values for all source positions
for which the simulation was executed
 The output file ‘currents.vtk’ contains the surface current values corresponding to
the first source orientation for each node
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RCS Plot
 A polar plot for the RCS result file can be generated by clicking on ‘Plot RCS’ from the
User Interface window
 This pops up as ‘RCS plotter’ window
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RCS Plot
 Select the RCS plane depending on varying elevation or azimuth.
 Select the RCS polarization that needs to be plotted.
 Click on ‘Update Plot’ to generate the RCS plot.
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Surface Current Visualization
 Surface currents generated from the solver can be visualized in ParaView, which gives
an idea about the hotspot visualization
 Presently the current visualization has not been integrated with the software
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PTD Solver Details
 The solver uses Physical Optics (PO) and Physical Theory of diffraction (PTD) for
computation
 The simulation can be undertaken for monostatic RCS computation
 Self shadowing effects are included which is used for surface current computation
 Computations are only done for perfect electric conductors
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Conclusions
 The PTD solver has been validated with different geometries and produces good
results with in the limits
 Post processing development is underway to help visualize surface currents etc.
 Generated output data can be used in easily accessible formats
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www.zeusnumerix.com
+91 72760 31511
Abhishek Jain
contact@zeusnumerix.com
Thank You !

CEM Workshop Lectures (7/11): PO/PTD Solver for RCS Computation

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