When carrier frequency agility is applied to SAR system

there could be some problems

such as Doppler chirp rate agility

focus-out in azimuth

etc.After we analyzed the phase characteristic of radar echo

correlation algorithm was applied to pulse compression in azimuth firstly.Considering the connatural problems of low efficiency and high side lobe level that correlation algorithm had

pulse compression algorithm based on compressed sensing was presented

which made use of the sparsity of echo signals.Then

a strategy about frequency agility SAR imaging was proposed which involves pulse compression in range based on matching filter and pulse compression in azimuth based on compressed sensing.The results indicate that imaging strategy can both conquer Doppler chirp rate agility and achieve frequency agility SAR imaging

which has the merit of lower side lobe level and higher resolution.