Robust short-range clutter suppression algorithm for forward looking airborne radar

The short-range clutter has serious range dependence for forward looking airborne radar (FLAR). As a result, when a radar detects moving targets on far range gates, the ambiguous short-range clutter degrades the performance of ground moving target indication (GMTI) obtained by spacetime adaptive processing (STAP). The elevation three dimensional adaptive processing can well mitigate the problem, but, the computational load of the method is too heavy to be applied in real scenarios. A robust elevation pre-filtering algorithm is proposed. This method does not need adaptive processing on the elevation elements in a planar-array antenna. Therefore, the computational load can be reduced greatly. This method suppresses the ambiguous short-range clutter by multi-elevation angles restriction and the cancellation weight on the clutter has a deep and wide notch. Moreover, the method is robust to the elevation angle errors. Simulation results show the validity of the method.

[1]  F.D. Lapierre,et al.  New solutions to the problem of range dependence in bistatic STAP radars , 2003, Proceedings of the 2003 IEEE Radar Conference (Cat. No. 03CH37474).

[2]  M. Zatman,et al.  The properties of adaptive algorithms with time varying weights , 2000, Proceedings of the 2000 IEEE Sensor Array and Multichannel Signal Processing Workshop. SAM 2000 (Cat. No.00EX410).

[3]  W.L. Melvin,et al.  A STAP overview , 2004, IEEE Aerospace and Electronic Systems Magazine.

[4]  Braham Himed,et al.  STAP with angle-Doppler compensation for bistatic airborne radars , 2002, Proceedings of the 2002 IEEE Radar Conference (IEEE Cat. No.02CH37322).

[5]  Zheng Bao,et al.  Short-Range Clutter Suppression for Airborne Radar by Utilizing Prefiltering in Elevation , 2009, IEEE Geoscience and Remote Sensing Letters.

[6]  L.E. Brennan,et al.  Theory of Adaptive Radar , 1973, IEEE Transactions on Aerospace and Electronic Systems.

[7]  P.M. Corbell,et al.  3-dimensional STAP performance analysis using the cross-spectral metric , 2004, Proceedings of the 2004 IEEE Radar Conference (IEEE Cat. No.04CH37509).

[8]  W.L. Melvin,et al.  Adaptive cancellation method for geometry-induced nonstationary bistatic clutter environments , 2007, IEEE Transactions on Aerospace and Electronic Systems.