Joint space-time interpolation for bistatic STAP

We present a novel interpolation technique to improve the small sample support performance of airborne radar space-time adaptive processing (STAP) using bistatic configurations. Bistatic airborne radar operation increases the clutter rank and causes it to be inhomogeneous with range, resulting in the degradation of the output signal to interference plus noise ratio (SINR). Brennan's rule for the space-time clutter covariance matrix rank for monostatic STAP is extended to the bistatic case, which motivates the development of a space-time interpolation (STINT) technique for bistatic clutter compensation. More specifically, we design a linear transformation which maps the bistatic clutter to that which would be received under "virtual" monostatic conditions. Simulation results indicate up to 10 dB SINR improvement can be obtained using STINT with limited sample support.

[1]  Jacques Verly,et al.  Registration-Based Solutions to the Range-Dependence Problem in Stap Radars , 2003 .

[2]  Gene H. Golub,et al.  Matrix computations , 1983 .

[3]  James Ward,et al.  Space-time adaptive processing for airborne radar , 1998 .

[4]  I. Reed,et al.  Rapid Convergence Rate in Adaptive Arrays , 1974, IEEE Transactions on Aerospace and Electronic Systems.

[5]  H. Pollak,et al.  Prolate spheroidal wave functions, fourier analysis and uncertainty — III: The dimension of the space of essentially time- and band-limited signals , 1962 .

[6]  G. K. Borsari,et al.  Mitigating effects on STAP processing caused by an inclined array , 1998, Proceedings of the 1998 IEEE Radar Conference, RADARCON'98. Challenges in Radar Systems and Solutions (Cat. No.98CH36197).

[7]  B. Friedlander.  The MVDR beamformer for circular arrays , 2000, Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154).

[8]  Wasfy B. Mikhael,et al.  Estimation of the clutter rank in the case of subarraying for space-time adaptive processing , 1997 .

[9]  Jeffrey L. Krolik,et al.  Space-time interpolation for adaptive arrays with limited training data , 2003, 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)..

[10]  Richard Klemm,et al.  Comparison between monostatic and bistatic antenna configurations for STAP , 2000, IEEE Trans. Aerosp. Electron. Syst..

[11]  Richard Klemm,et al.  Space-time adaptive processing : principles and applications , 1998 .