CAJ | 학술논문

针对太赫兹逆合成孔径雷达（ISAR）近场成像的问题，本文提出了采用格林函数分解的ISAR成像算法。文中结合太赫兹雷达超外差接收模式，构建和分析了近场条件下的目标回波模型。通过对回波模型中格林函数的分解，将表征球面波前的格林函数分解为二维平面波的叠加；并在频域完成对回波信号的滤波补偿和二维逆变换后，获得了太赫兹ISAR近场目标的图像。文中通过与二维FFT算法和本文算法进行的数值仿真结果对比，验证了该算法的可行性。最后利用太赫兹雷达转台实测数据对本文算法进行了验证和对比分析，结果表明该算法具有良好的成像性能。
침대태혁자역합성공경뢰체（ISAR）근장성상적문제，본문제출료채용격림함수분해적ISAR성상산법。문중결합태혁자뢰체초외차접수모식，구건화분석료근장조건하적목표회파모형。통과대회파모형중격림함수적분해，장표정구면파전적격림함수분해위이유평면파적첩가；병재빈역완성대회파신호적려파보상화이유역변환후，획득료태혁자ISAR근장목표적도상。문중통과여이유FFT산법화본문산법진행적수치방진결과대비，험증료해산법적가행성。최후이용태혁자뢰체전태실측수거대본문산법진행료험증화대비분석，결과표명해산법구유량호적성상성능。
In this paper,an imaging algorithm for terahertz inverse synthetic aperture radar using the Green’s function decomposition is proposed to implement near-filed imaging.Combined with the Superheterodyne receiver mode of terahertz radar,the model of terahertz target echo in the near-field is builded and analyzed.The spherical wave which is represented by Green’s function is decomposed to the superposition of plane wave components in two dimensions.After completing the operators of the filtering compensation and two dimension inverse fast Fourier transform,the target image of terahertz inverse synthetic aperture radar in the near-field condition.To demonstrate the imaging performances of our method,numerical simulations and experiments are conducted.Comparing the simulation results based on the two dimensional fast Fourier transform method and the proposed algorithm respectively,the feasibility of the proposed algorithm is verified.Finally,the real experimental data are used to validate the performance of the proposed algorithm and the experimental results demon-strate that our method can obtain a good imaging performance.