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@n0m4official n0m4official released this 01 Apr 20:17
V1.1.1
4153a8e

SpecterCS v1.1.1

Release type: Patch
Breaking changes: None (behavioral corrections only)

Fixed

Physical Optics (PO) Normalization

  • Corrected PO amplitude scaling to remove unphysical frequency-squared amplification.
  • Ensured RCS scales correctly with physical area, frequency, and aspect angle.
  • Eliminated runaway RCS values on large smooth surfaces.

UTD Edge Diffraction Stability

  • Switched edge diffraction accumulation from coherent amplitude summation to incoherent power summation.
  • Removed erroneous edge-length scaling from the diffraction kernel.
  • Added illumination and observer-visibility gating to suppress invalid edge contributions.
  • Suppressed grazing-incidence singularities where UTD asymptotics are not valid.

Aspect Angle and Orientation Handling

  • Aligned radar azimuth/elevation convention with aircraft body axes.
  • Corrected default load orientation so Azimuth = 0°, Elevation = 0° corresponds to nose-on illumination.
  • Restored physically correct large RCS variation with aspect angle (nose-on vs side-on vs broadside).

Mesh Import and Geometry Robustness

  • Validated STL import path for consistent metric interpretation.
  • Confirmed clean STL geometry produces stable and repeatable RCS results.
  • Identified malformed or non-manifold OBJ meshes as a major source of prior instability and overestimation.

Behavior Changes (Expected)

  • Large changes in RCS with orientation are now normal and physically correct.
  • PO dominates large, smooth surfaces; edge diffraction is secondary and bounded.
  • Perfectly conducting aircraft models represent theoretical upper-bound RCS values.
  • Clean STL meshes are strongly recommended for electromagnetic analysis.

Notes

This release completes the transition from unstable or misleading RCS output to a physically consistent high-frequency PO+UTD solver. Remaining discrepancies with real-world measurements are attributable to idealized materials and geometry, not solver errors.

Future work will focus on realism enhancements such as material losses, intake masking, and cavity attenuation.

Full Changelog: V1.1.0...V1.1.1

Use:

  1. Unzip archive
  2. Enter produced folder
  3. Navigate to Echo1.Wpf.exe (DO NOT REMOVE FROM FOLDER)
  4. Run
Assets 3
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