文中首先阐述了对星载合成孔径雷达进行电子侦察的必要性,建立了星载合成孔径雷达的电子侦察信号模型;其次,梳理了现有的工作参数估计方法,并就线性调频信号参数估计方法,选取短时傅里叶变换、Wigner-Ville分布、小波变换和分数阶傅里叶变换方法,在估计精度和交叉项抑制能力等方面进行了仿真分析对比,并对其优缺点进行了整理;然后,在工作模式判别方面介绍了基于侦收功率的判别方法和智能化判别方法;最后,合理分析了合成孔径雷达电子侦察技术的未来发展方向。

Considering the necessity of electronic reconnaissance for spaceborne synthetic aperture radar, the electronic reconnaissance signal model has been established firstly. Secondly, existing parameter estimation methods are sorted out. Typical chirp signal parameter estimation methods, including short-time Fourier transform, Wigner-Ville distribution, wavelet transform and fractional Fourier transform are selected for simulation analysis, and comparison are carried out in terms of estimation accuracy and cross-term suppression ability, the advantages and disadvantages are also illustrated. Thirdly, in the aspect of working mode discrimination,the methods based on detection power and intelligent discrimination methods are introduced. Finally, future development of synthetic aperture radar electronic reconnaissance method is analyzed reasonably.

TN971

国家自然科学基金资助项目;湖南省杰出青年基金资助项目