CN101726729A - High-precision receiver of geological radar - Google Patents
High-precision receiver of geological radar Download PDFInfo
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- CN101726729A CN101726729A CN200810224097A CN200810224097A CN101726729A CN 101726729 A CN101726729 A CN 101726729A CN 200810224097 A CN200810224097 A CN 200810224097A CN 200810224097 A CN200810224097 A CN 200810224097A CN 101726729 A CN101726729 A CN 101726729A
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Abstract
The invention relates to a high-precision receiver of a geological radar, comprising a trigger circuit, a low-voltage avalanche circuit, a double-pulse generator, a sampling head, a high amplifier, an integrator and a feedback circuit control unit. The response triggering impulse frequency of the receiver is 800KHz, and the high-frequency input analog signal bandwidth is 4GHz; and the receiver adopts 12V low-voltage avalanche signals to avoid the ripple wave noise of 100V high-voltage avalanche signals. The invention provides a receiving system special for a high-speed high-precision geological radar antenna, thereby meeting the high-speed detection demands of highways, municipal roads and railways.
Description
[technical field]
The present invention relates to a kind of geological radar antenna high-precision receiver, especially design a kind of high-precision receiver of geological radar that is used for latent disease fast detecting of roadbeds such as railway, highway and town road pipeline quick detection.
The geological radar receiving antenna is converted to high frequency analog signals with the high frequency electromagnetic wave signal of 100MHz～2GHz, high-precision receiver of geological radar is converted to low-frequency analog signal with high frequency analog signals exactly, for the subsequent acquisition card provides low frequency signal source to the analog to digital conversion of simulating signal.Therefore, high-precision receiver of geological radar directly influences the sensitivity and the signal to noise ratio (S/N ratio) of geological radar acquired signal, is one of critical component of geological radar equipment.
The geological radar technology is the shallow-layer high efficiency earth physical detecting new technology that had developed rice in recent years, it utilizes dominant frequency is the electromagnetic waves of tens of megahertzes to thousands of megahertz wave bands, form with the broadband short pulse, be sent to underground by antenna emitter by ground, behind the boundary reflection on underground purpose body or stratum, return ground, by the radar antenna receptacle is received,, reach the purpose of surveying the place ahead purpose body by the radar signal of being accepted is handled and image interpretation.Have rapid and convenient, precision height, and characteristics such as nondestructive detecting are used widely in fields such as engineering hydrogeologic survey, tunnel quality testing, airfield runway quality testing.By continuous technological improvement, the latent disaster source of highway, railway and town road roadbed that is applied to is gradually surveyed and the investigation of municipal underground utilities.
The present invention relates to ambits such as high-frequency electronic and geophysics is the new and high technology of one.
The present invention utilizes High-Frenquency Electronic Technology design and exploitation to have high precision broadband receiver system, and the high frequency analog signals that antenna is changed is converted to low frequency signal, and then reaches the analog-to-digital purpose of signal.
[background technology]
Geological radar is that the GEOPHYSICS FOR SHALLOW LAYER efficiently that grew up is in recent years surveyed new technology, and geological radar equipment and method can be divided into conventional sense radar and fast detecting radar.Normal radar pulse transmission frequency is often less than 200KHz, and fast detecting radar pulse frequency is greater than 200KHz.
At present, geological radar is mainly used in engineering exploration and tunnel context of detection both at home and abroad, all belongs to conventional sense radar application scope.The fast detecting radar is mainly used in latent fast detecting of roadbeds such as highway, railway and urban road pipeline detection.
The fast detecting radar is started in phase early 1980s, and states such as the Denmark on the European Scandinavian Peninsula, Sweden just begin ground penetrating radar is applied to the work of road fast detecting, but this at that time method do not begin widespread use as yet.1985, U.S. GSSI company was under Bureau of Public Road supports, the Vehicular radar system that uses at highway begins developed.The fast detecting Radar Technology is mainly used in the detection of road pasta layer at present, and roadbed hidden danger is surveyed the purpose that does not reach fast detecting, and main host computer control passage, antenna emission efficiency and unsettled design do not reach requirement.
Enter after 21 century, Italy has carried out the fast detecting research at roadbed hidden danger, has developed the 400MHz antenna, the acquisition system of 3 channel control units.At the beginning of 2007, U.S. GSSI company takes up at the research and development of roadbed hidden danger fast detecting radar instruments, and in May, 2007, U.S. GSSI company developed the 400MHz antenna that detects at roadbed.
The fast detecting radar receiver has the following disadvantages at present:
1, noise is bigger, is difficult to reach the purpose that detects little disease.The geological radar receiver all adopts the above high pressure snowslide of 100V circuit to produce sampling pulse at present, for example the SIR of GSSI series receiver.The high-voltage pulse of moment brings bigger induced signal to ground wire and signal wire, thereby the ripple that causes ground wire is bigger, and then reduces the precision of whole receiving system.
2, the limitation of receiver response trigger pip bandwidth.The geologic radar detection trigger pulse was all less than 200KHz in the past, and the high-speed sampling trigger pulse need reach 400KHz, at present the geological radar receiver under the effect of 400KHz trigger pulse, equal cisco unity malfunctions.
[summary of the invention]
The present invention compared with prior art has following advantage:
The present invention's development has the geological radar receiver of high precision, the response of broadband trigger pulse, and the present invention can be to 800KHz with interior start pulse signal operate as normal, the highest trigger pulse frequency response that can reach 800KHz; The present invention adopts low-voltage (24V) as avalanche voltage, and the requirement of railway, highway and municipal administration high speed, detected with high accuracy buried target body is satisfied in the interference of avoiding high pressure (being higher than 100V) to produce Ripple Noise.
The present invention mainly comprises following content:
● trigger circuit
● low pressure snowslide circuit
● dipulse generator circuit
● the sampling head circuit
● High Amplifier Circuit
● integrator circuit
● feedback circuit
(1) trigger circuit:
One that sends here from time base circuit receives trigger pip, be used for triggering the snowslide circuit and produce the snowslide pulse, but the amplitude of the reception trigger pip of sending here and negative edge (or rising edge) does not meet the demands, and need carry out shaping to receiving trigger pip.
Implement: be formed by connecting by devices such as integrated of LM7171 and diode 2N3906.
(2) low pressure snowslide circuit
Through the reception trigger pip that shaping is handled, trigger triode produces the snowslide pulse, and the negative edge of snowslide pulse can reach ± 10V/ns, and the dipulse generator is delivered in snowslide pulse output.
Implement: be formed by connecting by devices such as low pressure high-frequency tube BFP450.
(3) dipulse generator circuit
The high frequency sampling head needs the sampling dipulse signal of a strict symmetry, and 0.2 nanosecond of pulsewidth of this sampling dipulse signal, amplitude is greater than 2v, positive and negative strict symmetry.Sampling head dipulse generator is exactly to be adapted to the sampling dipulse signal that sampling head needs in order to produce such one.
Implement: be formed by connecting by devices such as step pipe MA44768.
(4) sampling head circuit
Sampling head comprise the biasing of sampling gate, sampling gate and before put etc., in order to gather high-frequency signal.
Implement: be formed by connecting by devices such as HMHS-2828 and 2N5486.
(5) High Amplifier Circuit
The high-frequency signal that sampling head is picked up amplifies.Gain amplifier is about 100, and the bandwidth of amplifier is at 200KHz～10MHz.
Implement: wait device to be formed by connecting by integrated of AD844.
(6) integrator circuit
Signal after the high frequency amplification is postponed and secondary sample, behind the integrating circuit integration, export, high-frequency signal is converted to low frequency signal.
Implement: wait device to be formed by connecting by integrated of IVC102.
(7) feedback circuit
Integral output signal is fed back to the sampling head biasing circuit, thus with sampling head, height put, integrator and feedback circuit etc. constitute the closed-loop path, thereby constitute a differential sample receiver.
Implement: wait device to be formed by connecting by integrated of AD845.
The present invention is achieved in that it comprises trigger circuit, low pressure snowslide circuit, dipulse generator circuit, sampling head circuit, High Amplifier Circuit, integrator circuit and feedback circuit composition.Wherein trigger circuit connect low pressure snowslide circuit, low pressure snowslide circuit connects trigger circuit and dipulse generator, the dipulse generator connects low pressure snowslide circuit and sampling head, sampling head connects dipulse generator, feedback circuit and height respectively and puts, height is put and is connected sampling head and integrator, integrator connects feedback circuit and height is put, and feedback circuit connects sampling head and integrator.
The present invention reaches following key technical index:
● receiver input high-frequency signal bandwidth: 4GHz
● pulse transmission frequency: 800KHz
● receiver sensitivity: 50 microvolts
● height is put: 10db fixes
● avalanche voltage: ± 10 volts
[description of drawings]
Fig. 1 is the block flow diagram of technical solution of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
[embodiment]
Referring to illustrated in figures 1 and 2, mode of the invention process is as follows:
The first step: trigger circuit are given low pressure snowslide circuit to the trigger pip shaping of input with the trigger pip after the shaping.
Second step: low pressure snowslide circuit produces the avalanche signal of burst pulse.
The 3rd step: avalanche signal produces sampling dipulse signal by the dipulse generator again and gives sampling head, the offset signal of sampling head signal utilization sampling dipulse signal and feedback circuit, the high frequency analog input signal is sampled, and sampled signal is delivered to height put the row amplification into.
Ground four step: CPLD receive input end of analog signal mouth data, and with digitizing, digitized result are kept in the storage unit of USB controller.
The 5th step: height is put the high-frequency signal after amplifying is delivered to integrator.
The 6th step: integrator is finished the integration and the double sampling of signal, and high-frequency signal is become low-frequency analog signal output, simultaneously the result is delivered to feedback circuit.
The 7th step: feedback circuit is regulated bias voltage automatically according to the signal of integrator, and gives sampling head with the result, continues to finish next difference sampling process.
Claims (6)
1. high-precision receiver of geological radar system, it comprises that trigger circuit, low pressure snowslide circuit, dipulse generator, sampling head, height are put, integrator and feedback circuit, it is characterized in that: trigger circuit, low pressure snowslide circuit and dipulse generator are the unidirectional control that is connected, and produce the needed sampling dipulse of sampling head by the trigger pip excitation; Sampling head, height are put, integrator is that closed circuit is connected control with feedback circuit, constitute the differential sample of high-frequency signal.
2. receiver system according to claim 1 is characterized in that: described unidirectional connection control is to connect control low pressure snowslide circuit by trigger circuit, and low pressure snowslide circuit connects control dipulse generator.
3. receiver system according to claim 1 is characterized in that: it is to connect height by sampling head to put that described closed circuit connects control, and height is put the connection integrator, and integrator connects feedback circuit, and feedback circuit connects the control sampling head
4. receiver system according to claim 1 is characterized in that: the high frequency analog signals that receiver system receives is imported at sampling head.
5. receiver system according to claim 1 is characterized in that: the low-frequency analog signal that receiver system receives is exported at integrator.
6. receiver system according to claim 1 is characterized in that: the negative edge of snowslide pulse can reach ± 10V/ns; In the receiver response trigger pulse frequency 800KHz; Receiver is 4GHz to high frequency analog signals input bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102240979A CN101726729B (en) | 2008-10-16 | 2008-10-16 | High-precision receiver of geological radar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102240979A CN101726729B (en) | 2008-10-16 | 2008-10-16 | High-precision receiver of geological radar |
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| Publication Number | Publication Date |
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| CN101726729A true CN101726729A (en) | 2010-06-09 |
| CN101726729B CN101726729B (en) | 2012-06-20 |
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| CN2008102240979A Expired - Fee Related CN101726729B (en) | 2008-10-16 | 2008-10-16 | High-precision receiver of geological radar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937586A (en) * | 2012-11-01 | 2013-02-20 | 南京信息工程大学 | Laser radar based water-in-cloud raman scattering full-spectrum measurement system and method thereof |
| CN103197288A (en) * | 2013-04-12 | 2013-07-10 | 中国石油集团钻井工程技术研究院 | Misering range radar in drilling and signal generator thereof |
| CN106772363A (en) * | 2016-12-27 | 2017-05-31 | 张映辰 | A kind of underground criminal case material evidence detection system and method based on geological radar |
| CN111413694A (en) * | 2020-04-27 | 2020-07-14 | 江苏协和电子股份有限公司 | Double-pulse radar |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2289250Y (en) * | 1996-12-10 | 1998-08-26 | 中国科学院长春地理研究所 | Underground detecting radar transmitter |
| CN1170171C (en) * | 2001-02-28 | 2004-10-06 | 彭苏萍 | Explosion-proof geologic radar collection system |
| JP2006064644A (en) * | 2004-08-30 | 2006-03-09 | Tdk Corp | Pulse wave radar device |
| JP2007170819A (en) * | 2005-12-19 | 2007-07-05 | Tdk Corp | Pulse-wave radar apparatus |
-
2008
- 2008-10-16 CN CN2008102240979A patent/CN101726729B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937586A (en) * | 2012-11-01 | 2013-02-20 | 南京信息工程大学 | Laser radar based water-in-cloud raman scattering full-spectrum measurement system and method thereof |
| CN103197288A (en) * | 2013-04-12 | 2013-07-10 | 中国石油集团钻井工程技术研究院 | Misering range radar in drilling and signal generator thereof |
| CN106772363A (en) * | 2016-12-27 | 2017-05-31 | 张映辰 | A kind of underground criminal case material evidence detection system and method based on geological radar |
| CN111413694A (en) * | 2020-04-27 | 2020-07-14 | 江苏协和电子股份有限公司 | Double-pulse radar |
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| Publication number | Publication date |
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| CN101726729B (en) | 2012-06-20 |
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Free format text: FORMER OWNER: PENG SUPING YANG FENG Effective date: 20120828 Owner name: ZHONGKUANG HUA AN ENERGY TECHNOLOGY (BEIJING) CO., Free format text: FORMER OWNER: CHINA UNIVERSITY OF MINING + TECHNOLOGY, BEIJING Effective date: 20120828 |
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Effective date of registration: 20120828 Address after: 100083, building 3, building 16, Qinghua Dong Road, Beijing, Haidian District 0302 Patentee after: Middling Huaan energy technology (Beijing) Co., Ltd. Address before: 100083 Beijing City, Haidian District Institute of Rutosids No. 11 Patentee before: China University of Mining & Technology, Beijing Patentee before: Peng Suping Patentee before: Yang Feng |
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Granted publication date: 20120620 Termination date: 20121016 |