The application of GSM(Global System for Mobile communication) signal as opportunity source of passive bistatic radar has been demonstrated in many references.However

in the early research

only the suppression of direct signal and multipath from the host station is considered.In practice

GSM based passive bistatic radar receives interference not only from the host station but also from other station with the same frequency.In order to suppress the interference from the host station as well as the one from other stations

this paper proposes that the host station's interference is firstly cancelled using ECA(Extensive Cancellation Algorithm) algorithm

and then the other stations' interference is suppressed by a robust adaptive beamformer based worst-case optimization.In the end

simulations verify the availability of the proposed method.