Abstract
A directional borehole radar consists of one transmitting antenna in the borehole and four receiving antennas distributed at equal angles in a ring. The receiving antennas can determine the depth and orientation of targets beside the borehole. However, the problem of target orientation determination and 3D imaging algorithms remains a technological challenge. The MUSIC (multiple signal classification) algorithm requires a peak search, so the accuracy of the operation is limited by the angle interval. Based on the MUSIC algorithm, the Root-MUSIC algorithm is proposed and implemented. By replacing the spectral peak search with calculating the roots of the polynomials greatly improves the orientation recognition accuracy. Finally, the results obtained using the above algorithm are verified with synthetic data and compared with the results of the MUSIC algorithm. The results show that both the MUSIC algorithm and the Root-MUSIC algorithm can achieve very good orientation determination and 3D imaging results. In terms of accuracy, the Root-MUSIC algorithm has an obvious improvement compared with the MUSIC algorithm.
Highlights
IntroductionThe results show that both the MUSIC algorithm and the Root-MUSIC algorithm can achieve very good orientation determination and 3D imaging results
When the incident wave azimuth of the model is 196 degrees, the azimuth calculated by the Root-MUSIC algorithm is 196.1932 degrees, and the azimuth calculated by the MU10 of 17
Calculating the roots of polynomials is used to replace the spectral peak search of the MUSIC algorithm so that the accuracy of azimuth recognition is no longer limited by the angle interval of the spectral peak search, which greatly improves the accuracy of azimuth recognition
Summary
The results show that both the MUSIC algorithm and the Root-MUSIC algorithm can achieve very good orientation determination and 3D imaging results. The Root-MUSIC algorithm has an obvious improvement compared with the MUSIC algorithm. GPR (Ground penetrating radar) is an effective spherical physical method to detect targets by using the electrical properties of underground media [1]. It mainly detects the underground electrical targets by transmitting and receiving high frequency electromagnetic waves [1]. After the returned electromagnetic wave is received, a radar time profile is formed by processing the signal.
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