Abstract: 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.