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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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A Novel Multiband Fusion Method Considering Scattering Characteristic Fluctuation Between Sub-Bands.

Peng Li¹, Ling Luo², Denghui Huang³

¹National Key Laboratory of Complex Aviation System Simulation, Chengdu 610036, China.

Sensors (Basel, Switzerland)

|November 27, 2025

Summary

This study introduces a new multiband fusion (MF) method that accounts for scattering center fluctuations. The novel approach significantly improves radar ultra-wideband echo generation and target recognition accuracy.

Keywords:

GTD model frequency-dependent factor multiband fusion scattering characteristics fluctuation ultra-wideband

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Area of Science:

Radar technology
Electromagnetic scattering

Background:

Multiband fusion (MF) enhances radar resolution and target recognition by generating ultra-wideband echoes (UWBEs) from sub-band echoes (SBEs).
Existing MF techniques often neglect scattering center (SC) incoherence across frequency bands, degrading performance.

Purpose of the Study:

To propose a novel MF method addressing SC characteristic fluctuations between sub-bands.
To improve fusion accuracy and radar target recognition capabilities.

Main Methods:

Theoretical analysis of incoherent phase terms due to SC fluctuations.
Extraction and categorization of scattering centers (SCs) into intrinsic (ISCs) and unique (USCs) using the geometrical theory of diffraction (GTD) model.
Development of a new incoherent phase estimation and compensation method based on SC categorization.

Main Results:

The proposed method effectively mitigates inter-sub-band incoherence.
Individual UWBEs are generated via fusion or super-resolution for different SC types.
Validated using simulated and measured electromagnetic scattering data.

Conclusions:

The novel MF method demonstrates significantly greater fusion accuracy than traditional approaches.
Explicitly modeling SC fluctuations enhances radar performance and target recognition.