This paper deals with the target-detection issue that a high-resolution synthetic aperture radar (SAR)-ground moving target indication (GMTI) system under remote surveillance mode faces many challenges

i.e.

target-diffusing and low signal-to-noise ratio

and based on the fact that extended targets with conventional target detection methods based on the poin target cause decrease in detection performance

a Shape-Shadow-Aided Moving Target Detector(S

2

A-MTD) is proposed for extended target detection of airborne multichannel SAR-GMTI.First

the shaped information of a target is obtained when the residual image with adaptive clutter suppression clustered.Then

shadow-template matched with shaped information of a target is evaluated

which is based on the model

of the geometric relationship on a moving extended target and its shadow.Meanwhile

according to estimative radial velocity

position-matched condition with shadow is generated.Finally

taking all the information in shape

position and amplitude of shadow into consideration is to eliminate false targets that not satisfy with matching conditions

so as to reduce false alarms.the simulation results show the validity that this method improves the detection performance of the extended target under low signal-to-noise ratio.