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Generating ultra-wideband pulse is a key technique for subsurface ground penetrating radar. By sharpening the transition time of pulse, the high frequency component can be improved, which contributes to the increase of bandwidth. In this paper, a compact pulse generator based on avalanche transistor and step recovery diode (SRD) is studied. Load resistor in the Gaussian pulse circuit is optimized...
The ability to penetrate medium and provide high-resolution image makes holographic radar popular among researchers in recent years. However, the strong clutter caused by the non-flat surface, which is unavoidable in practice, may obscure the image of target. This paper presents a Principal Component Analysis (PCA) based method to remove the surface clutter and enhance the imaging result. The symmetric...
A circular survey using GPR is employed for tree roots detection in field measurement. A new 3D imaging algorithm is also proposed for implementing the 3D reconstruction of the subsurface targets in cylindrical coordinate system. The proposed algorithm can avoid the spatial interpolation of the acquired data between coordinate systems and employs the wave equation extrapolation technique to implement...
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...
In order to meet the requirement of high measurement precision for ground penetrating radar (GPR), the geometrical calibration processing methods of the antenna are proposed to solve the measuring deflection problem and the antenna vibration problem for the bistatic impulse system. The calibration measurement method for the layer thickness is also presented to reduce the thickness measurement error...
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