The accurate estimation of target scattering characteristics is deemed crucial in modern remote sensing technology, wherein valuable prior information is provided for radar applications, such as target recognition and auxiliary imaging. Ultra-wideband signals with high signal-to-noise ratios can be generated by microwave photonic radar (MWP), allowing for the precise estimation of target scattering characteristics. Due to the requirements of MWP radar in completing tasks, such as antiinterference and resource management, it usually emits radar signals in discrete subbands. However, discrete spectra lead to a significant reduction in the accuracy of target scattering parameter estimates. An algorithm that combines low-rank and sparse priors for the estimation of target attribute scattering parameters, along with the simultaneous recovery of the missing spectrum through a joint solution model, is introduced in this article. First, the impact of the missing spectrum on parameter estimation is analyzed by employing the MWP echo model with discrete subbands. Subsequently, a joint model for spectrum restoration and target parameter estimation, featuring low-rank and sparse priors, is constructed. An improved alternating direction method of multipliers algorithm is proposed for the joint solution of the problems related to missing spectrum recovery and scattering characteristics estimation. In contrast to traditional algorithms, the robustness of the optimization algorithm's solution is enhanced in this article through the introduction of an equilibrium threshold factor, thus preventing the global optimization problem from being trapped in local optima. Finally, the structural enhancement of imaging results by the estimated target scattering centers is demonstrated, thereby improving the interpretability of remote sensing images. The effectiveness of the algorithm proposed in this article is validated using measured MWP radar data.


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    Title :

    Joint Optimization of Spectrum Recovery and Target Scattering Parameter Estimation in Microwave Photonic Radar


    Contributors:
    Hai, Yu (author) / Wu, Junjie (author) / Pu, Wei (author) / Shao, Zhaoyi (author) / Huang, Peng (author) / Li, Zhongyu (author) / Wang, Anle (author) / Wang, Dangwei (author) / Huang, Yulin (author) / Yang, Jianyu (author)


    Publication date :

    2024-12-01


    Size :

    10628452 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English