Joint filtering scheme of multistation GSM interference for UHF-band radar

UHF-band radar, which is widely used in early warning, has the unique advantage on target detection. However it can be seriously interfered by the GSM base station with the same frequency channel in practical application. Nowadays the solution is just avoiding the frequency which GSM used. However, with the increasing number of GSM clients, the spectrum which can be used by UHF-radar will be compressed inevitable. It not only leads to the frequency resource wasted, but also impacts the detection ability of UHF-band radar. A polarization-space joint filtering scheme is proposed in this paper, which is based on the antenna configuration with orthogonal dual-polarization array elements and main, auxiliary arrays. By employing this filtering scheme, the radar can detect targets effectively, even there is much interference in the main lobe and side lobe simultaneously. The detection ability of UHF-band radar will be effectively improved in complex electromagnetic environment by using this method. In this paper, the model of signal received by array is established, and the recursive filtering algorithm is designed. The simulation is finally done to validate.