A kind of MIMO ground penetrating radar plane antenna array and corresponding imaging method

Antenna array is widely used in real time imaging of ground penetrating radar (GPR). With circumstance restricting, the number and interval of antenna elements are difficult to fit the need of high imaging resolution. In this paper, a kind of 4-transmitter and N-receiver MIMO GPR plane antenna array is proposed. Based on phase center approximation (PCA) theory, its equivalent antenna array is a uniform square antenna array with 4N T/R antenna elements, and the interval of equivalent elements is half of that of the real receiving elements. The equivalent uniform square antenna array has two synthetic apertures and can obtain the 2D information of target. So, the 2D image of the target can be derived by using narrowband transmitting signals and the 3D image can be derived by using wideband transmitting signals. Corresponding imaging method and procedure are also given in this paper.

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