CN-120491053-B - Drilling geological radar device and directional detection method

CN120491053BCN 120491053 BCN120491053 BCN 120491053BCN-120491053-B

Abstract

The invention relates to a drilling geological radar device and a directional detection method, wherein the drilling geological radar device comprises a shielding layer and an internal structure, the internal structure comprises a main control module, a gyroscope, a high-frequency antenna and a low-frequency antenna, the shielding layer comprises a directional receiving antenna, the main control module is used for controlling the high-frequency antenna and the low-frequency antenna to emit multi-frequency multi-resolution multi-scale electromagnetic wave signals, the shielding layer is used for controlling the radiation directions of the electromagnetic wave signals emitted by the high-frequency antenna and the low-frequency antenna, receiving the reflected electromagnetic wave signals through the directional receiving antenna, emitting different electromagnetic wave signals according to different requirements and receiving electromagnetic wave signals of different angles, the detection requirements are met, the high-frequency antenna, the low-frequency antenna and the directional receiving antenna are arranged on the drilling geological radar device, the electromagnetic wave signals are directionally emitted and received through the requirements, the advancing distance and the angle information of the electromagnetic wave signals are recorded through the gyroscope, and an additional rotating device is not needed.

Inventors

YAN HAITAO
YANG ZHONGSHENG
WU KAIFENG
GAO YUNFENG
YANG YONGLONG
YUE ZHAO
YE HUI

Assignees

中交第二公路勘察设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20250512

Claims (8)

1. A drilling geological radar device is characterized by comprising a shielding layer and an internal structure, wherein the internal structure comprises a main control module, a gyroscope, a high-frequency antenna and a low-frequency antenna; the main control module is used for controlling the high-frequency antenna and the low-frequency antenna to emit multi-frequency, multi-resolution and multi-scale electromagnetic wave signals; the shielding layer is used for controlling the radiation directions of electromagnetic wave signals emitted by the high-frequency antenna and the low-frequency antenna and receiving the reflected electromagnetic wave signals through the directional receiving antenna; the gyroscope is used for recording the advancing distance and angle information of the electromagnetic wave signals; the shielding layer comprises a PIN diode; The shielding layer is also used for controlling the radiation directions of the high-frequency antenna and the low-frequency antenna through the on-off of the PIN diode; The directional receiving antenna is formed by combining a dipole antenna and a plurality of cross-shaped metal structures, and when the PIN diode is not conducted, the dipole antenna and the plurality of cross-shaped metal structures reflect electromagnetic wave signals.
2. A method of directional detection adapted for use with the borehole geological radar device of claim 1, said method comprising: The radar profile data comprises a high-frequency antenna and a low-frequency antenna in the borehole geological radar, a first electromagnetic wave signal with different frequencies and different directions and a second electromagnetic wave signal received by a directional receiving antenna are transmitted to the periphery of the borehole; Performing angle domain filtering on the radar profile data according to an angle weight corresponding to the transmitting angle or the receiving angle to obtain a time space domain wave field; determining the space energy density and the counter-transmission energy density of a preset direction according to the first electromagnetic wave signal and the second electromagnetic wave signal in the time space domain wave field; and obtaining an imaging section according to the space energy density and the back-propagation energy density, and detecting the drilling hole according to the imaging section.
3. The directional detection method according to claim 2, wherein the performing angular domain filtering on the radar profile data according to the angle weight corresponding to the transmitting angle or the receiving angle to obtain a time-space domain wave field includes: performing two-dimensional Fourier transform on the radar profile data to obtain a frequency-wave number domain wave field; determining a corresponding angle weight according to the transmitting angle or the receiving angle; performing angle domain interpolation calculation on the frequency-wave number domain wave field according to a preset first angle domain interpolation algorithm and the angle weight to obtain a plane wave field; Calculating the plane wave field and the frequency-wave number domain wave field according to a preset second angle domain interpolation algorithm and the angle weight to obtain a space wave field; and performing two-dimensional Fourier inverse transformation on the space wave field to obtain a space-time wave field.
4. A method of directional detection according to claim 3, wherein said calculating said planar wavefield and said frequency-wavenumber domain wavefield according to a predetermined second angular domain interpolation algorithm and said angular weights to obtain a spatial wavefield comprises: Performing two-dimensional Fourier inverse transformation on the frequency-wave number domain wave field to obtain a time-space wave field; performing offset filtering on the time-space wave field to obtain an offset section after the angle domain filtering; performing two-dimensional Fourier inverse transformation on the offset profile to obtain a time-wave number wave field; and calculating the time-wave number wave field and the plane wave field according to a second angle domain interpolation algorithm and the angle weight value to obtain a space wave field.
5. The directional detection method according to claim 2, wherein determining the spatial energy density and the counter-transmission energy density of the preset direction from the first electromagnetic wave signal and the second electromagnetic wave signal in the time-space domain wave field comprises: transmitting first electromagnetic wave signals with different frequencies to the preset direction of the drilling hole according to the high-frequency antenna and the low-frequency antenna in the time space domain wave field to obtain space energy density; and obtaining the counter-transmission energy density according to the second electromagnetic wave signal in the preset direction received by the directional receiving antenna in the time space domain wave field.
6. The method of directional detection according to claim 2, wherein said deriving an imaging profile from said spatial energy density and said back-propagation energy density comprises: Respectively calculating the space energy density and the back transmission energy density according to an energy density calculation formula to obtain a target space energy density and a target back transmission energy density; and calculating the target space energy density and the target back-transfer energy density according to a preset imaging formula to obtain an imaging profile.
7. The directional sounding method of claim 6, wherein said energy density calculation formula is: In the formula, 、 The electric fields in the x and y directions respectively, In the form of a magnetic field, In order to achieve an energy density of the material, 、 Representing the unit vectors in the x and y directions, respectively.
8. The orientation detection method according to claim 6, wherein the preset imaging formula is: In the formula, For energy density intensity, T is the calculated total time, As a function of the direction of the energy flow, Azimuth for directional transmission and directional reception of a given antenna, Is that An energy density threshold function of the direction, Is the final imaging profile.

Description

Drilling geological radar device and directional detection method Technical Field The invention relates to the technical field of geophysical exploration, in particular to a drilling geological radar device and a directional exploration method. Background The drilling geological radar is used as an important geophysical detection technology, plays an important role in the fields of deep geological exploration, engineering geological investigation, mineral resource detection and the like, but the prior art still has a plurality of defects, and limits the wider application and further development of the drilling geological radar. In the prior art, a drilling radar antenna generally adopts a fixed-frequency antenna for detection, the detection requirements of shallow high resolution and deep large range cannot be considered in the same detection process, and a traditional drilling geological radar system generally adopts a separated structural design, namely a host computer is connected with the antenna through a cable, and the antenna mainly depends on the gravity to realize the mobile detection in the vertical direction. This structural design works well in vertical borehole detection, but faces many challenges in long distance horizontal borehole detection. In horizontal drilling, the antenna cannot be moved effectively by gravity, requiring an additional rotating device. Therefore, there is an urgent need to provide a borehole geological radar device and a directional detection method, which solve the technical problems that in the prior art, borehole geological radar is usually detected by adopting an antenna with fixed frequency, and a separated structure is adopted, so that the shallow high resolution and deep large-scale detection requirements cannot be considered in long-distance horizontal hole detection. Disclosure of Invention In view of the foregoing, it is necessary to provide a borehole geological radar device and a directional detection method, so as to solve the technical problems that in the prior art, borehole geological radar is usually detected by adopting an antenna with a fixed frequency, and a separated structure is adopted, so that cable transmission signals are seriously attenuated in long-distance horizontal hole detection, and detection accuracy and reliability are affected. In order to solve the above-mentioned problems, the present invention also provides, in a first aspect, a borehole geological radar apparatus, comprising: The device comprises a shielding layer and an internal structure, wherein the internal structure comprises a main control module, a gyroscope, a high-frequency antenna and a low-frequency antenna; the main control module is used for controlling the high-frequency antenna and the low-frequency antenna to emit multi-frequency, multi-resolution and multi-scale electromagnetic wave signals; the shielding layer is used for controlling the radiation directions of electromagnetic wave signals emitted by the high-frequency antenna and the low-frequency antenna and receiving the reflected electromagnetic wave signals through the directional receiving antenna; the gyroscope is used for recording the advancing distance and angle information of the electromagnetic wave signals. In one possible implementation, the shielding layer includes a PIN diode; The shielding layer is also used for controlling the radiation directions of the high-frequency antenna and the low-frequency antenna through the on-off of the PIN diode. In one possible implementation, the directional receiving antenna is formed by combining a dipole antenna and a plurality of cross-shaped metal structures, and when the PIN diode is not conducted, the dipole antenna and the plurality of cross-shaped metal structures are equivalent to a reflecting plate, and electromagnetic wave signals are reflected through the reflecting plate. In a second aspect, the present invention provides a method for directional detection, comprising: The radar profile data comprises a high-frequency antenna and a low-frequency antenna in the borehole geological radar, a first electromagnetic wave signal with different frequencies and different directions and a second electromagnetic wave signal received by a directional receiving antenna are transmitted to the periphery of the borehole; Performing angle domain filtering on the radar profile data according to an angle weight corresponding to the transmitting angle or the receiving angle to obtain a time space domain wave field; determining the space energy density and the counter-transmission energy density of a preset direction according to the first electromagnetic wave signal and the second electromagnetic wave signal in the time space domain wave field; and obtaining an imaging section according to the space energy density and the back-propagation energy density, and detecting the drilling hole according to the imaging section. In one possible implementation manner, the performin