A novel method to eliminate ionospheric phase contamination in OTHR systems

In over-the-horizon radar (OTHR), radar signals are subjected to ionosphere perturbation as they propagate through the ionosphere, and the weak echo signal from the low-speed target is almost masked by the spreading of Bragg peak. In order to acquire the spread sea clutter accurately, sliding window band-pass filters is proposed to extract the first order clutter (calibration signal), which can realize adaptive selection of the filter bandwidth. At the same time, a novel algorithm named Covariance Matrix Solving method (CMS) is presented to correct ionospheric phase contamination. Theoretical analysis and real data processing indicate that CMS method has a good performance and can obtain a better correction effect than Phase Gradient Autofocus (PGA) method.

[1]  Hou Chengyu,et al.  Adaptive Elimination of Ionospheric Contamination for HF Skywave Radars , 2007, Second International Conference on Innovative Computing, Informatio and Control (ICICIC 2007).

[2]  Benjamin T. Root.  Ionospheric distortion mitigation techniques for over-the-horizon radar , 2000, SPIE Optics + Photonics.

[3]  S. J. Anderson,et al.  A unified approach to detection, classification, and correction of ionospheric distortion in HF sky wave radar systems , 1998 .

[4]  Xingzhao Liu,et al.  A piecewise parametric method based on polynomial phase model to compensate ionospheric phase contamination , 2003, 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)..

[5]  D. C. Cooper,et al.  Use of the Wigner-Ville distribution to compensate for ionospheric layer movement in high-frequency sky-wave radar systems , 1993 .

[6]  Fan-Liang Li,et al.  The Solutions of Matrix Equations (AX = B, XC = D) with a Submatrix Constraint , 2008, 2008 Fourth International Conference on Natural Computation.

[7]  Xing Meng.  Phase perturbation correction in ionospheric electromagnetic wave propagation , 2002 .

[8]  J. Parent,et al.  On the estimation of quasi-instantaneous frequency modulation of HF signals propagated through the ionosphere , 1990 .

[9]  Xiaoguo Song,et al.  A Novel Phase Distortion Correction Method Based on Temporal Correlation Matrix , 2011 .

[10]  Wei-bo Deng,et al.  An improved PGA algorithm for ionosphere phase perturbation correction , 2010, Proceedings of the 9th International Symposium on Antennas, Propagation and EM Theory.

[11]  Eung-Gi Paek,et al.  High-resolution over-the-horizon radars using time reversal , 2009, Defense + Commercial Sensing.