CN-121995375-A - Large-burial-depth ground penetrating radar system supporting multipath data acquisition

Abstract

The invention discloses a large buried depth ground penetrating radar system supporting multipath data acquisition, which comprises a real-time sampling main control system, a plurality of back plate systems, an array antenna system, an accurate positioning unit and an upper computer. The multi-receiving focusing mode is used for actively enhancing the signal energy of a deep target area, the multi-dimensional scattering information of a target body is obtained by utilizing the multi-path mode, and the multi-path data is cooperatively processed by the system data superposition, so that the problems of rapid signal attenuation, low signal to noise ratio, contradiction between resolution and penetration depth and strong polynomials of inversion results when the traditional ground penetrating radar detects a large buried target are effectively solved, and the penetration capacity, imaging resolution and reliability of geological interpretation of the deep detection are remarkably improved.

Inventors

• CUI FAN
• ZHANG GUIXIN
• Zhao Yingxiao

Assignees

• 中国矿业大学(北京)

Dates

Publication Date

20260508

Application Date

20260317

Claims (6)

1. 1. A large buried depth ground penetrating radar system supporting multipath data acquisition is characterized in that deep signal energy is effectively enhanced through superposition processing of an innovative hardware architecture and cooperative data, multidimensional information is comprehensively utilized, and detection and imaging of a large buried depth target body with high signal to noise ratio, high resolution and high reliability are achieved.
2. 2. The hardware architecture of claim 1 comprises a real-time sampling master control system, a multi-back plate system, an array antenna system, a precise positioning unit and an upper computer.
3. 3. The real-time sampling master control system according to claim 2, comprising an FPGA, a high-speed AD, a transmit pulse generation circuit, an echo signal receiving multiplexing circuit, a clock management circuit, and a ranging wheel interface circuit.
4. 4. The multiple back plane system echo signal input and switching of claim 2, the transmit pulse trimming, high voltage power supply module. Echo signal input, switching and transmitting pulse are arranged from an antenna to an AD, and a multiplexer is integrated on a back plate to realize multi-path receiving signal acquisition.
5. 5. The array antenna system of claim 2, in a modular design, comprising a transmitting antenna and a plurality of receiving antennas. The modular design is that each antenna module is connected to a main control subsystem and a data acquisition subsystem through cables, and power and signals are switched through a wiring extension in the antenna subsystem. The array antenna system comprises a transmitting front end, a pulse source, a transmitting antenna, a receiving antenna and a low-noise amplifier.
6. 6. The data superposition processing according to claim 1 comprises performing data preprocessing such as gain recovery, background denoising, frequency domain filtering and the like on each path data, performing time difference correction and in-phase addition on multipath data by using electromagnetic wave speed information, and improving the detection depth.

Description

Large-burial-depth ground penetrating radar system supporting multipath data acquisition Technical Field The invention relates to the technical field of ground penetrating radar detection, in particular to a large buried depth ground penetrating radar system supporting multipath data acquisition. The acquisition of multipath propagation information of electromagnetic waves in an underground medium is realized by acquiring and processing echo signals with multiphase information, and the detection depth of the ground penetrating radar is obviously improved by combining the data superposition of multipath. Background The ground penetrating radar is a geophysical method for acquiring underground scene information by utilizing the characteristic that electromagnetic waves generate reflection and scattering phenomena at the electromagnetic characteristic change position of an underground medium, and can realize efficient and nondestructive detection of an underground target body. With the deep development of the research of the ground penetrating radar method, the detection task is improved from simply acquiring the position, form, size and other information of the target body to accurately inverting the structural characteristics of the target body with large burial depth. For the detection of a large buried depth target body, the traditional ground penetrating radar system faces serious challenges (1) the signal attenuation is serious, the electromagnetic wave decays exponentially along with the propagation distance, the deep signal is extremely weak, and the signal to noise ratio is low. (2) The resolution contradicts the detection depth, and a high-frequency antenna is needed to improve the resolution, but the high-frequency signal decays faster, and a low-frequency antenna is needed to increase the detection depth, but the resolution is reduced. (3) The single acquisition path information is limited, and a traditional system usually adopts a single transmitting-receiving path, so that the inversion interpretation of a single data set has multiple solutions and insufficient precision and reliability for complex deep construction. (4) The anti-interference capability is weak, and deep weak signals are extremely easy to be submerged by environmental noise and system noise. In the prior art, although array antennas or multichannel systems are adopted to increase the spatial sampling density, the system architecture, signal excitation and processing modes are not suitable for enhancing and extracting extremely weak signals in large-burial depth detection. How to cooperatively improve the penetration capability, resolution and interpretation reliability of large-burial-depth detection is a problem to be solved in the art. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a large buried depth ground penetrating radar system supporting multipath data acquisition. The system effectively enhances deep signal energy through the superposition processing of an innovative hardware architecture and cooperative data, comprehensively utilizes multidimensional information, and realizes the detection and imaging of a large buried depth target body with high signal-to-noise ratio, high resolution and high reliability. The technical scheme of the invention is that the large-buried-depth ground penetrating radar system supporting multipath data acquisition comprises a real-time sampling main control system, a multi-back plate system, an array antenna system, an accurate positioning unit and an upper computer. Further, the real-time sampling master control system comprises an FPGA, a high-speed AD and a circuit. And directly sampling echo signals, obtaining N sampling points by each echo, controlling the stepping relation between transmission and sampling through a plurality of transmission periods, and splicing obtained data to obtain a complete echo waveform. Further, the circuit comprises a transmitting pulse generating circuit, an echo signal receiving multiplexing circuit, a clock management circuit and a range wheel interface circuit. Furthermore, the multi-back plate system adopts a multi-transmission multi-reception working mode, and reliably interfaces with the real-time sampling master control system through the SMB interface, so that multi-path echo signal access is realized. Further, the functions of the multi-back-plate system comprise echo signal input and switching, and a transmitting pulse arrangement and high-voltage power supply module. Furthermore, the echo signal input, switching and transmitting pulse are arranged from the antenna to the AD, and a multiplexer is integrated on the backboard to realize multi-path receiving signal acquisition. Further, the high-voltage power supply module is 1 high-voltage power supply. Furthermore, the array antenna system adopts a modularized design and consists of a transmitting antenna and a plurality of receiving antennas. Furth