Synthetic Aperture Radar（SAR） is an all-day

all-weather high-resolution senor that has been widely used in civilian mapping

military investigation

and strategic reconnaissance.Ground Moving Target Indication（GMTI） can detect and track moving targets

and obtain their moving information

which has been an important application of SAR for ground moving target detection and imagery.SAR

which has GMTI capability

can obtain focused stationary target images and moving target information at the same time

and form a more detailed battlefield map.Thus

it has increasingly become an important part of battlefield surveillance and strategic reconnaissance systems.Jamming technology research against SAR-GMTI has been an issue in the area of electronic countermeasures because of the growing threat of SAR-GMTI systems to important military moving targets.SAR-GMTI systems typically use multiple channels to suppress cluttering and jamming.Thus

traditional jamming methods for SAR are usually invalid for SAR-GMTI systems.In this paper

a new jamming method for multi-channel SAR-GMTI is proposed;this method is cosinusoidal phase-modulated repeater jamming based on a moving jamming station.First

the imaging feature of repeater jamming of a moving jamming station is analyzed by the principle of stationary phase and is used to realize azimuth jamming extension.At the same time

the cosinusoidal phase-modulated signal model is proposed and used to realize range jamming extension

thereby enabling their combination to realize two dimension jamming extension in range and azimuth.Second

the jamming performance of the proposed method for SAR is analyzed thoroughly

and the relationship between jamming parameters and performance is obtained.Then

the countering performance against SAR-GMTI is analyzed by using the cancelling technique of tri-channel interference

and the cancelling output expression of the final interference is derived.Finally

the simulation experiment and application example are presented.Computer simulation and theoretical analysis show that the method can produce flexible and controlled two dimension banded or planar-covering jamming performance for SAR and SAR-GMTI.Moreover

because of interference suppression and cancellation of multichannel GMTI

the amplitude of false targets is affected by sinusoidal modulation coefficient

thereby revealing enhanced and weakened areas.The proposed method is simple

flexible

and controllable.Compared with the deceptive jamming method

its dependence on reconnaissance is lower;and compared with the traditional barrage jamming method

its jamming signal power requirement is lower because of the high two dimension coherent processing gain.The method can protect stationary and moving ground targets at the same time

thereby effectively strengthening the countering performance for multi-channel SAR-GMTI systems.Moreover

the method has important military application value.