CN103018723B - Frequency interference suppression device for pulse system ground penetrating radar - Google Patents
Frequency interference suppression device for pulse system ground penetrating radar Download PDFInfo
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- CN103018723B CN103018723B CN201210530241.8A CN201210530241A CN103018723B CN 103018723 B CN103018723 B CN 103018723B CN 201210530241 A CN201210530241 A CN 201210530241A CN 103018723 B CN103018723 B CN 103018723B
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Abstract
The invention discloses and provides a frequency interference suppression device for a pulse system ground penetrating radar. The frequency interference suppression device for the pulse system ground penetrating radar comprises a supporting rod which is connected with a support plate which is connected with an absorber plate and the supporting rod is provided with a radar antenna. The frequency interference suppression device for the pulse system ground penetrating radar has the advantages of being capable of timely adjusting the shielding scope and direction by utilizing the groove design and being capable of not only effectively absorbing the electromagnetic clutter but also converting the electromagnetic clutter into the heat energy by absorbing coatings and shielding absorption coatings of the absorber plate to effectively avoid the high frequency oscillation between a shielding cavity and a receiving antenna.
Description
Technical field
The present invention relates to a kind of RF-interference suppression equipment for pulse system ground penetrating radar.
Background technology
Ground penetrating radar is to utilize ultrahigh frequency pulse electromagnetic wave to penetrate a kind of ipping coil primary means with reflection characteristic Underground medium or target, it can be in the situation that not destroying surface infrastructure fast, easily buried target and structure are carried out to lossless detection, one of tool application prospect and method of development prospect in current various buried target non-destructive Detection Techniques, be widely used in the departments such as urban construction, traffic, geology, archaeology, national defence, being mainly used at present (1) underground metal or nonmetal embedded object (for example pipeline, cable etc.) surveys; (2) in buildings (as bridge, building), reinforcing bar, cable louding are surveyed; (3) road quality detects and comprises pavement quality, road surface thickness and hidden danger etc.; (4) geologic prospecting, as rock stratum, cavity, tomography, geologic structure, underground water, underground mine etc.; (5) ancient tomb and ancient site are surveyed; (6) river, river, bed surface mapping and the Underwater Target Detection in lake; (7) ice sheet, frozen soil layer thickness measure; (8) criminal investigation, as surveyed the lethal weapon of burying, the wiretap of burying underground in corpse and wall etc.; (9) military surveillance, as ordnance, the detection of land mine and underground military installations etc.
In the work of ground penetrating radar transmitter by transmission antennas transmit high-frequency impulse electromagnetic wave to being detected ground surface, electromagnetic wave is in passing through underground medium process, while running into discontinuous medium (as metal pipe line), can there is electromagnetic reflection, and received antenna is accepted, by analysis and processing to the echoed signal of receiver catcher, determine the information such as position, trend and physical dimension of discontinuous medium.But in the practical application of ground penetrating radar, the signal that radar receives is the coupling of very complicated multi-signal, mainly comprise three parts: (1) comes from the direct-coupling ripple between dual-mode antenna and comes from the reflection wave of ground surface, and the two is collectively referred to as direct wave; (2) echoed signal that underground measured target produces; (3) from the Radio frequency interference (RFI) (RFI) of electromagnetic signals such as frequency modulation broadcasting, TV and communication system.Direct wave and Radio Frequency Interfere have stronger non-stationary and randomness in time with in frequency, they and ground penetrating radar echo signals are overlapping, the echoed signal of " having flooded " buried target in time domain on the one hand, on the other hand at frequency domain " abnormalization " spectrum structure of target echo, these impacts bring difficulty to detection, identification and imagings of target.The inhibition of direct wave and RFI is the important ring in the application of ground penetrating radar engineering.
Through the literature search of prior art is found to have many documents all propose this problem and be studied, if Chinese name of document is " identification of interference wave in ground penetrating radar record ", " signature analysis of ground penetrating radar interference waveform ", " research of GPR Echo Signal Preprocess Method and application " and academic dissertation " ground penetrating radar is disturbed the research of inhibition and velocity of wave estimation problem ", " ground penetrating radar suppresses Radio frequency interference (RFI) technical research " etc., but make a general survey of these technical literatures, the research proposing and solution are all to take corresponding way on signal is processed, and comprise that adaptive beam forms and offsets, time domain parameter is estimated and modeling, frequency domain interference identification and trap etc., mainly take adaptive window medium filtering on algorithm, frequency domain trap, wave-average filtering, catastrophe point detects, small echo gating, random phase encoding, random equivalent samplings etc., have enough signal to noise ratio (S/N ratio)s but the proposition of these methods is all the signal receiving based on GPR Receiver, if but on-the-spotly in practical application exist very strong Radio frequency interference (RFI) can directly cause the saturation of receiver and cannot normally work.These methods and algorithm have certain directive significance to the development of novel ground penetrating radar, but cannot solve the difficulty that the ground penetrating radar of having shaped and having used in practice runs into.
Through the literature search of prior art is found, China's name of document is " FDTD with the ground exploring radar antenna of shielding cavity and absorbing material analyzes ", the document is from the angle of Antenna Design, adopted Three-dimensional Time Domain method of finite difference (FDTD) methods analyst shielding cavity and the impact of absorbing material on its radiation characteristic, design and improvement that its result can be antenna provide physical basis intuitively, but cannot solve equally the difficulty that the ground penetrating radar of having shaped and having used in practice runs into.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a kind of RF-interference suppression equipment for pulse system ground penetrating radar, the groove design that it adopts, can adjust scope and the direction of shielding in good time, the antiradar coatings of baffle and shielding absorbing coating not only can effectively absorb electromagnetism clutter, and electromagnetism clutter can be converted into heat energy, effectively avoid the higher-order of oscillation between shielding cavity and receiving antenna.
The present invention is the object that reaches above-mentioned, and the present invention adopts following technical scheme:
A RF-interference suppression equipment for pulse system ground penetrating radar, comprises pole, and described pole is connected with back up pad, and described back up pad is connected with baffle; On described pole, radar antenna is installed.
Described pole is upper is installed with snap ring by tight locking button; Described pole is connected with back up pad by snap ring.
Described snap ring is by being connected by the first fixed pin between two the first semicircular ring; Described tight locking button is by being connected by the second fixed pin between two the second semicircular ring; Described 2 the first semicircular ring are connected with 2 the second semicircular ring respectively.
On described snap ring, offer 10 grooves, and every adjacent two notch end of 10 groove ecto-entads to divide the formed angle in the center of circle that is clipped to snap ring be 30o.
10 back up pads are installed on described pole, and 10 back up pads are connected with 10 baffles respectively; Between described every two baffles, all by folding hinge, be connected.
Described baffle adopts aluminium flake to make, and aluminium flake internal layer is coated with antiradar coatings, and aluminium flake skin is coated with shielding absorbing coating.
In described baffle, the thickness of aluminium flake is 1mm.
In described baffle, antiradar coatings, shielding absorbing coating all adopt complex ferrite antiradar coatings; It is the complex ferrite antiradar coatings that its model of Taizhou Tuogu Super-fine Materials Co., Ltd. is TGS-L190 that described complex ferrite antiradar coatings adopts manufacturer.
Described baffle adopts the cylindrical structural that the center of circle is 30o.
Distance between described baffle inwall and radar antenna is 20-30cm.
Beneficial effect of the present invention is: the invention provides a kind of RF-interference suppression equipment for pulse system ground penetrating radar, the groove design that it adopts, can adjust scope and the direction of shielding in good time, the antiradar coatings of baffle and shielding absorbing coating not only can effectively absorb electromagnetism clutter, and electromagnetism clutter can be converted into heat energy, effectively avoid the higher-order of oscillation between shielding cavity and receiving antenna, and it has good physics and environmental resistance, reach following technical indicator: (1) is high to electromagnetism clutter absorptivity, can reach 15-20dB, Absorber Bandwidth 10MHZ～10GHZ, (2) in wider temperature range stable chemical performance, (3) corrosion of ageing-resistant and various media, (4) fire prevention, electrostatic prevention.
Accompanying drawing explanation
Fig. 1 is the structural representation of invention;
Fig. 2 is the structure for amplifying schematic diagram of snap ring and tight locking button in Fig. 1.
Embodiment
Embodiment 1
As shown in Figure 1 and Figure 2, the present embodiment provides a kind of RF-interference suppression equipment for pulse system ground penetrating radar, comprises pole 2, and described pole 2 is connected with back up pad 4, and described back up pad 4 is connected with baffle 1; On described pole 2, radar antenna 3 is installed.On described pole 2, by tight locking button 6, be installed with snap ring 5; Described pole 2 is connected with back up pad 4 by snap ring 5.Described snap ring 5 is by being connected by the first fixed pin 7 between two the first semicircular ring 51; Described tight locking button 6 is by being connected by the second fixed pin 9 between two the second semicircular ring 61; Described 2 the first semicircular ring 51 are connected or integrally manufactured forming with 2 the second semicircular ring 61 respectively.On described snap ring 5, offer 10 grooves 8, and every adjacent two groove 8 ends of 10 groove 8 ecto-entads to divide the formed angle in the center of circle that is clipped to snap ring 5 be 30o.Described baffle 1 adopts the cylindrical structural that the center of circle is 30o.Described groove 8 in the shape of a spiral.10 back up pads 4 are installed on described pole 2, and 10 back up pads 4 are connected with 10 baffles 1 respectively; Between described every two baffles 1, all by folding hinge, be connected, thereby form an electromagnetic screen chamber.Baffle 1 adopts identical material to make with back up pad 4.The arc radius of baffle 1 and height, determine according to the physical dimension of the ground penetrating radar of institute's adapted, its principle is to shield ground penetrating radar receiving antenna, the distance 25cm between radar antenna and shielding cavity inwall.By controlling the expansion radian size of radio shielding-baffle 1, adjust shield ranges; By adjusting radio shielding-baffle 1 orientation, select shield direction.Shielding cavity in height leaves total needs that enough space promotes to meet receiving antenna simultaneously.
Described baffle 1 adopts aluminium flake to make, and aluminium flake internal layer is coated with antiradar coatings, and aluminium flake skin is coated with shielding absorbing coating.In described baffle 1, the thickness of aluminium flake is 1mm.In described baffle 1, antiradar coatings, shielding absorbing coating all adopt complex ferrite antiradar coatings.It is the complex ferrite antiradar coatings that its model of Taizhou Tuogu Super-fine Materials Co., Ltd. is TGS-L190 that described complex ferrite antiradar coatings adopts manufacturer.Metallic aluminium is good for electromagnetic shielding effect, and shielding absorbing coating can be the most by force for shielding electromagnetic waves effect.Antiradar coatings can prevent from producing the higher-order of oscillation between shielding cavity and receiving antenna, and makes shielding cavity internal action be absorbed and be converted to heat energy and consume to the electromagnetic wave on shielding cavity.The requirement of coating is that Absorber Bandwidth, absorptivity are high, quality is light, environmental protection, adhesion are good, stable performance etc., generally need to select or customize according to the radiation bandwidth that will absorb.The present invention is directed to the radio-frequency region of 10MHz-10GHz, adopted cheap complex ferrite antiradar coatings, energy attenuation reaches 15～20DdB.
The ground penetrating radar of this device of adapted in the course of the work, if disturbing, near the stronger radio-frequency electromagnetic of existence cause radar " to be become deaf ", can open baffle 1, to receiving dwi hastasana, become an optionally shielding cavity, adjust baffle 1 expanded angle and orientation, select to have expanded angle and the orientation of optimal inhibition effect, then with tight locking button 6 lockings, make radar antenna 3 relative with baffle 1 fixing, and then survey.
A kind of RF-interference suppression equipment for pulse system ground penetrating radar of the present embodiment manufacturing, the groove design that it adopts, can adjust scope and the direction of shielding in good time, the antiradar coatings of baffle and shielding absorbing coating not only can effectively absorb electromagnetism clutter, and electromagnetism clutter can be converted into heat energy, effectively avoid the higher-order of oscillation between shielding cavity and receiving antenna, and it has good physics and environmental resistance, reach following technical indicator: (1) is high to electromagnetism clutter absorptivity, can reach 15-20dB, Absorber Bandwidth 10MHZ～10GHZ; (2) in wider temperature range stable chemical performance; (3) corrosion of ageing-resistant and various media; (4) fire prevention, electrostatic prevention.
Claims (7)
1. for a RF-interference suppression equipment for pulse system ground penetrating radar, it is characterized in that: comprise pole (2), described pole (2) is connected with back up pad (4), and described back up pad (4) is connected with baffle (1); Radar antenna (3) is installed on described pole (2), and described pole (2) is upper is installed with snap ring (5) by tight locking button (6); Described pole (2) is connected with back up pad (4) by snap ring (5), on described snap ring (5), offer 10 grooves (8), and 10 to divide the formed angle in the center of circle that is clipped to snap ring (5) be 30o to every adjacent two grooves (8) end of groove (8) ecto-entad, 10 back up pads (4) are installed on described pole (2), and 10 back up pads (4) are connected with 10 baffles (1) respectively; Between every two baffles (1), all by folding hinge, be connected.
2. a kind of RF-interference suppression equipment for pulse system ground penetrating radar according to claim 1, is characterized in that: described snap ring (5) is by being connected by the first fixed pin (7) between two the first semicircular ring (51); Described tight locking button (6) is by being connected by the second fixed pin (9) between two the second semicircular ring (61); Described 2 the first semicircular ring (51) are connected with 2 the second semicircular ring (61) respectively.
3. a kind of RF-interference suppression equipment for pulse system ground penetrating radar according to claim 2, is characterized in that: described baffle (1) adopts aluminium flake to make, and aluminium flake internal layer is coated with antiradar coatings, and aluminium flake skin is coated with shielding absorbing coating.
4. a kind of RF-interference suppression equipment for pulse system ground penetrating radar according to claim 3, is characterized in that: in described baffle (1), the thickness of aluminium flake is 1mm.
5. a kind of RF-interference suppression equipment for pulse system ground penetrating radar according to claim 4, is characterized in that: in described baffle (1), antiradar coatings, shielding absorbing coating all adopt complex ferrite antiradar coatings; Described complex ferrite antiradar coatings adopts the complex ferrite antiradar coatings that model is TGS-L190.
6. a kind of RF-interference suppression equipment for pulse system ground penetrating radar according to claim 5, is characterized in that: described baffle (1) adopts the cylinder ring structure that angle is 30o.
7. a kind of RF-interference suppression equipment for pulse system ground penetrating radar according to claim 6, is characterized in that: the distance between described baffle (1) inwall and radar antenna (3) is 20-30cm.
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| CN201210530241.8A CN103018723B (en) | 2012-12-06 | 2012-12-06 | Frequency interference suppression device for pulse system ground penetrating radar |
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| CN107436435A (en) * | 2017-08-07 | 2017-12-05 | 广州地铁设计研究院有限公司 | A kind of the GPR device and its detection method of single hole detection boulder |
| CN107883430A (en) * | 2017-12-21 | 2018-04-06 | 四川亿阳华泰科技有限公司 | A kind of electromagnet heater |
| CN109031210B (en) * | 2018-08-29 | 2023-12-26 | 中国电力工程顾问集团西北电力设计院有限公司 | Shielding device of geological radar low-frequency unshielded antenna |
| CN111929646A (en) * | 2020-08-14 | 2020-11-13 | 中国地质大学（北京） | Beam scanning ground penetrating radar system and intelligent beam scanning detection method |
| CN112271461B (en) * | 2020-10-27 | 2021-07-02 | 华中科技大学 | Hybrid-loading dual-polarization ground penetrating radar array antenna |
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Inventor after: Yu Yueshen Inventor after: Fu Rong Inventor after: Song Yuanbin Inventor after: Tong Guofeng Inventor after: Liang Kan Inventor after: Dong Linfeng Inventor after: Zhang Yanqing Inventor after: Huang Chunguang Inventor after: Fan Ligen Inventor after: Ji Xiaojun Inventor before: Yu Yueshen Inventor before: Song Yuanbin Inventor before: Tong Guofeng Inventor before: Liang Kan Inventor before: Dong Linfeng Inventor before: Zhang Yanqing Inventor before: Huang Chunguang Inventor before: Fan Ligen Inventor before: Ji Xiaojun |
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Free format text: CORRECT: INVENTOR; FROM: YU YUESHEN SONG YUANBIN TONG GUOFENG LIANG KAN DONG LINFENG ZHANG YANQING HUANG CHUNGUANG FAN LIGEN JI XIAOJUN TO: YU YUESHEN SONG YUANBIN TONG GUOFENG LIANG KAN DONG LINFENG ZHANG YANQING HUANG CHUNGUANG FAN LIGEN JI XIAOJUN FU RONG |