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In the signal processing for metrewave radar, the reffection paths of target echoes can cause severe error in the elevation estimation for the low-angle target tracking. The exact angles of the reffection paths are unknown beforehand, and therefore, the reffection paths can not be suppressed easily. Therefore, in this article, an improved reffection paths suppression approach is presented. A block matrix aggregate is constructed based on the possible angles of the reffection paths. Combined with the beamforming-like processing, a generalized maximum likelihood estimation is derived to optimize the estimation. Moreover, the noise reduction method based on the Toeplitz covariance matrix is used for better performance. This approach is applied to the real data collected by the low-angle tracking radar with 8-channel vertical array. The experiment results show that the reffection effects are reduced and the accuracy of the elevation estimate is improved.
The exact angles of the reffection paths are unknown beforehand, and therefore, the reffection paths can not be suppressed easily. Therefore, in this article, an improved reffection paths suppression approach is presented. A block matrix aggregate is constructed based on the possible angles of the reffection paths. optimize the estimation. Moreover, the noise reduction method based on the Toeplitz covariance matrix is used for better performance. This experiment is applied to the real data collected by the low-angle tracking radar with 8-channel vertical array. the reffection effects are reduced and the accuracy of the elevation estimate is improved.