Corresponding to the problem of being unable to remove terrain scattered jamming from the domains of time

space and frequency

this paper proposes an anti-jamming method based on jittering slope polarity of Linear Frequency Modulated（LFM） signal and limiting processing.This method first jitters chirp rate polarity of LFM signal transmitted by the radar in slow-time domain

then does match-filters for the jamming signals hidden in the radar echoes

since jamming is more powerful than radar echo

the next process of limiting will lower the amplitude of jamming greatly

after limiting process

limited echoes are inversely match-filtered

so jamming and real radar echo are all back to the original time domain

then the next normal imaging process can be implemented which will also provide the real radar echo more gain than jamming

so SJR（Signal-to-Jamming Ratio） is further enhanced.Simulation results testify the anti-jamming performance of the method.