A blind range-direction estimation method is proposed for suppressing the mainlobe smart jamming (MSJ). The proposed method can effectively suppress the MSJ and estimate the direction-distance parameter of the target echo. Firstly

the target and MSJ is separated by the blind source separation (BSS) algorithm with the element data

and the estimation of the mixed matrix can be obtained simultaneously. Secondly

according to the prior information that the MSJ contains multiple false target echoes in a certain direction

while the real target just contains one echo

we can determine the separated channel which contains the real target. In this way

the real target distance parameter can be estimated. Finally

the mixed matrix column vector of the real target is obtained by the above judgement

which can be adopted to estimate the direction parameter of the real target.Simulation results show that the proposed method can effectively suppress two MSJs at least

and obtain good range-direction estimation performance at the same time. In addition

we analyze the effects of signal-to-noise ratio (SNR)

interference-to-noise ratio (INR)

the angle between the target and MSJ

and the MSJ number on the performance of the proposed method. The corresponding boundary conditions are also given.