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feat: non-parametric frquency domain identification algorithm#2

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jamestjsp wants to merge 2 commits intofeat/sippy-factory-patternfrom
feat/frequency-domain-impl
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feat: non-parametric frquency domain identification algorithm#2
jamestjsp wants to merge 2 commits intofeat/sippy-factory-patternfrom
feat/frequency-domain-impl

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Add spectral analysis utilities and corresponding tests

  • Introduced a new module spectral_utils.py containing functions for power spectrum and cross-spectrum computation, frequency response estimation, coherence computation, and spectral smoothing.
  • Implemented Welch's method for power spectrum and cross-spectrum calculations.
  • Added utility functions for window creation and frequency denormalization.
  • Developed comprehensive test cases for the spectral utilities to ensure functionality and correctness.
  • Updated simulation_utils.py to utilize the new spectral utilities for model uncertainty estimation.

Add spectral analysis utilities and corresponding tests

- Introduced a new module `spectral_utils.py` containing functions for power spectrum and cross-spectrum computation, frequency response estimation, coherence computation, and spectral smoothing.
- Implemented Welch's method for power spectrum and cross-spectrum calculations.
- Added utility functions for window creation and frequency denormalization.
- Developed comprehensive test cases for the spectral utilities to ensure functionality and correctness.
- Updated `simulation_utils.py` to utilize the new spectral utilities for model uncertainty estimation.
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