CN1310041C - Emission scanning phased array ground detecting radar - Google Patents
Emission scanning phased array ground detecting radar Download PDFInfo
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- CN1310041C CN1310041C CNB2004100573160A CN200410057316A CN1310041C CN 1310041 C CN1310041 C CN 1310041C CN B2004100573160 A CNB2004100573160 A CN B2004100573160A CN 200410057316 A CN200410057316 A CN 200410057316A CN 1310041 C CN1310041 C CN 1310041C
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Abstract
The present invention relates to an emission scanning phased array ground detecting radar which is composed of a radar host, an emission antenna array, a multichannel emitter, a receiving antenna array, a multichannel receiver, a front-end integrated controller and a portable internal industrial control computer, wherein the emission antenna array and the receiving antenna array respectively form a 16 unit plane square matrix in a 4*4 mode, and are respectively and correspondingly connected with a 16 channel emitter and a 16 channel receiver; each of the emission antenna units and the receiving antenna units adopts a circular ring fan-type radiation line design with a low section, and broadband circular polarization radiation and receiving are formed. The present invention has the advantages that because of a phase control scanning design of transmitted beams, when the 16 unit emission phased array works, effective ground penetrating coupling electromagnetic wave energy is enhanced more than 30 times of that of single antenna emission. The present invention has the characteristics of frequency bandwidth, deep penetration distance, high resolution, strong anti-interference capability, strong target detection and recognition capability, etc., and can well meet the requirements of quick non-destructive detection of geophysical prospecting engineering.
Description
Technical field
The present invention relates to a kind of emission scan Method in Phased-array Ground-penetrating Radar, belong to radar and (descend) the observation technology field over the ground, its effect is to utilize the near-field thermal radiation interference pattern of phased array antenna and fast beam scan characteristic, at the very strong wave beam of underground interference compound direction, and utilize the electromagnetic wave energy of each antenna element radiation " phase differential " (the realizing) give each antenna element that synthetic wave beam is scanned fast by delay circuit.Then utilize array signal process technique during reception, each channel signal of receiving array is carried out amplitude and phase compensation, receiving array is had and emission array points to identical directivity.By said process, realize underground quick scanning probe.
Background technology
Existing ground penetrating radar is designed to the form of single-antenna transmission, single antenna reception mostly, the array ground penetrating radar design that also has a spot of single-antenna transmission, many antennas to receive.Two kinds are adopted the ground penetrating radar of single-antenna transmission that several common shortcomings are arranged: 1. the electromagnetic wave to eradiation is omnidirectional basically, a little less than the excitation to the detection of a target, causes investigation depth shallow; When 2. reducing frequency in order to increase investigation depth, can not fine solution investigation depth and the contradiction of longitudinal frame.3. laterally resolution characteristic is poor.4. quantity of information is less.
Summary of the invention
The object of the present invention is to provide a kind of can be at the very strong launching beam of underground formation directivity, and make the emission scan Method in Phased-array Ground-penetrating Radar of launching beam in underground quick scanning.This Method in Phased-array Ground-penetrating Radar penetrates dark to the energy utilization efficiency height of underground radiated electromagnetic wave over the ground; In underground quick scanning, underground detected target can be realized the irradiation of different directions by launching beam, helps detection and identification to underground target; Receiving antenna array forms sensing and the beam angle received beam identical with launching beam, has avoided various Active Jamming and the passive interference outside the received beam.It has and penetrates dark, characteristics such as horizontal resolution is high, contain much information, strong anti-interference performance over the ground, can better solve the contradiction of ground penetrating radar penetration depth and longitudinal frame, can satisfy the requirement of physical prospecting engineering to the quick nondestructive detection preferably.
The objective of the invention is to realize by following technical scheme, it is by radar host computer (1), launching antenna array (2), hyperchannel emission machine (3), receiving antenna array (4), multichannel receiver (5), front end general controller (6) and portable integrated industrial computer (7) are formed, RS232 control line (8) two ends connect portable integrated industrial computer (7) and front end general controller (6) respectively, radar return cable (9) two ends connect radar host computer (1) and front end general controller (6) respectively, front end general controller (6) links to each other with multichannel receiver (5) with hyperchannel emission machine (3) respectively by cable, hyperchannel emission machine (3) is corresponding with launching antenna array (2) to link to each other, multichannel receiver (5) is corresponding with receiving antenna array (4) to link to each other, and portable integrated industrial computer (7) links to each other with radar host computer (1).Wherein the data collecting card that is made of DSP is built in the data acquisition that realizes 16 passages in the industrial computer (7), pre-service etc.
The emission hardware system mainly is made up of launching antenna array (2) and corresponding hyperchannel emission machine (3), launching antenna array (2) forms plane, Unit 16 square formation in 4 * 4 modes, hyperchannel emission machine (3) is 16 passages, and each channel transmitter (31) links to each other with each transmission antenna unit (21) is corresponding one by one.Each channel transmitter (31) mainly forms by two avalanche transistors are in parallel.
Receiving hardware system is made up of receiving antenna array (4) and corresponding multichannel receiver (5), receiving antenna array (4) forms plane, Unit 16 square formation in 4 * 4 modes, multichannel receiver (5) is 16 passages, and each passage receiver (51) links to each other with each receiving antenna unit (41) is corresponding one by one.Each passage receiver (51) is mainly formed by four pipe bridge formula balance gates.
The circle ring sector radiant rays design of low section is all adopted in each transmission antenna unit (21) and receiving antenna unit (41), forms broadband circle polarized radiation and reception.
Each channel transmitter (31) triggers by the time delay combinations pattern of setting, in underground formation beam scanning under the control of front end general controller (6).
Constitute principal and subordinate's control system by computing machine, TMS320C31, TMS320F206 and TMS320F240.Computing machine is by the control of interface realization to system, and the storage and the flow field of finishing data simultaneously show; Finish the A/D conversion by TMS320C31 as the data collecting card of processor, recording channel is put in order and by serial ports radar host computer is controlled; TMS320F206 is as the controller of radar host computer, and the order that receives host computer realizes the setting of duty such as the non-linear amplification, filtering to the radar received signal.TMS320F240 is the core of front controller, finishes the control of launching beam scanning and the control of received signal equivalence sampling.
Whole hardware system is divided into front-end and back-end two parts, and the rear end is carried out State Control by RS232 (8) interface to front end, and front end is delivered to radar host computer (1) with radar echo signal by cable (9).In the course of work, front end moves, the back-end location relative fixed.
Each transmission antenna unit (21) is all by separately transmitter feed-in.In order to obtain needed pulse width and amplitude, two avalanche transistor parallel connections have been taked, on matched load, obtain rise time and all satisfactory fast pulse of amplitude size, improve the snowslide pulse back edge, finally obtain needed emission burst pulse with step-recovery diode (SRD).Pulse source circuit adopts the external trigger mode.
Each receiving antenna unit (41) respectively connects the receiver of a passage.The sampling receiver is taked four pipe bridge formula balance gate circuit design.The balance gate circuit is all littler than the sampling leakage and the bypassing effect of non-equilibrium gate circuit; Also reduce sampling gate and opened back sampling pulse and the inner influence that mixes noise to sampling output.Four pipe bridge formula balance gate circuit are compared with two-tube balance gate circuit, and the isolation of back level is wanted high, have reduced bypassing effect; In addition, each arm of four pipe bridge formula doors is composed in series by two diodes, makes total junction capacity less, has improved the frequency characteristic and the transient characteristic of gate circuit.
For realizing the launching electromagnetic wave bundle, control each road impulse source delay volume on demand by scan control circuit and trigger in underground scanning.
Be the phase mutual interference between the reduction system, taked following interference protection measure: 1. the control signal between digital circuit and mimic channel is isolated by photoelectrical coupler; 2. adopt between the difference in functionality modular circuit as far as possible separate power supply; 3. take shielding measure between each function module circuit, reduce radiation interference.
Launching antenna array (2) and receiving antenna array (4) all take to paste ground coupling scheme work.
Emission scan Method in Phased-array Ground-penetrating Radar equipment provided by the present invention can form the launching beam of high directivity in the subsurface investigation near field region, and mode is on demand carried out the launching beam scanning of different angles direction.Effective formation and the scanning that underground near field narrow beam has all been verified in experiment is surveyed in laboratory principle experiment and outfield that the present invention did, and this ability is that existing ground penetrating radar is not available.Ground penetrating radar with the phased scan capability of launching beam provided by the present invention is a Method in Phased-array Ground-penetrating Radar truly.
Show by update search, do not see the bibliographical information of Method in Phased-array Ground-penetrating Radar at home and abroad.Therefore, the emission scan Method in Phased-array Ground-penetrating Radar of the present invention's development is that a kind of brand-new geophysical project is reconnoitred equipment, will have broad application prospects at archaeology, Urban Buried Pipeline Network detection, airport and aspects such as highway detection, tunnel forward probe.
Advantage of the present invention is: owing to adopted the phased Scan Design of launching beam, when 16 unit transmit phased arrays were worked, effectively the coupled electromagnetic wave energy had improved more than 30 times than single-antenna transmission thoroughly; By the scanning of launching beam, shine underground detected target from different perspectives on the direction.Owing to adopted distributed multichannel array to receive design (16 receiving element), can form the received beam and the received beam scanning of highly directive; Because adopted the travelling-wave aerial design of circle ring sector radiant rays, antenna has very wide frequency band range, make to transmit and better conformal of received signal.Adopt the emission scan Method in Phased-array Ground-penetrating Radar of above design, characteristics such as have bandwidth, penetration range is dark, resolution is high, antijamming capability is strong, target detection and recognition capability are strong can satisfy the requirement of physical prospecting engineering quick nondestructive detection preferably.
Description of drawings
Fig. 1 is an emission scan Method in Phased-array Ground-penetrating Radar three-dimensional synoptic diagram
Fig. 2 is an emission scan Method in Phased-array Ground-penetrating Radar launching antenna array inner structure synoptic diagram
Fig. 3 is an emission scan Method in Phased-array Ground-penetrating Radar receiving antenna array inner structure synoptic diagram
Fig. 4 is the circle ring sector radiant rays antenna element planar structure synoptic diagram of bowing
Fig. 5 is the positive side structure synoptic diagram of circle ring sector radiant rays antenna element
Embodiment
The described emission scan Method in Phased-array Ground-penetrating Radar of present embodiment, it is by radar host computer (1), launching antenna array (2), hyperchannel emission machine (3), receiving antenna array (4), multichannel receiver (5), front end general controller (6) and portable integrated industrial computer (7) are formed, RS232 control line (8) two ends connect portable integrated industrial computer (7) and front end general controller (6) respectively, radar return cable (9) two ends connect radar host computer (1) and front end general controller (6) respectively, front end general controller (6) links to each other with multichannel receiver (5) with hyperchannel emission machine (3) respectively by cable, hyperchannel emission machine (3) is corresponding with launching antenna array (2) to link to each other, multichannel receiver (5) is corresponding with receiving antenna array (4) to link to each other, and portable integrated industrial computer (7) links to each other with radar host computer (1).Wherein the data collecting card that is made of DSP is built in the data acquisition that realizes 16 passages in the industrial computer (7), pre-service etc.
The emission hardware system mainly is made up of launching antenna array (2) and corresponding hyperchannel emission machine (3), launching antenna array (2) forms plane, Unit 16 square formation in 4 * 4 modes, hyperchannel emission machine (3) is 16 passages, and each channel transmitter (31) links to each other with each transmission antenna unit (21) is corresponding one by one.Each channel transmitter (31) mainly forms by two avalanche transistors are in parallel.
Receiving hardware system is made up of receiving antenna array (4) and corresponding multichannel receiver (5), receiving antenna array (4) forms plane, Unit 16 square formation in 4 * 4 modes, multichannel receiver (5) is 16 passages, and each passage receiver (51) links to each other with each receiving antenna unit (41) is corresponding one by one.Each passage receiver (51) is mainly formed by four pipe bridge formula balance gates.
The circle ring sector radiant rays design of low section is all adopted in each transmission antenna unit (21) and receiving antenna unit (41), forms broadband circle polarized radiation and reception.
Each channel transmitter (31) triggers by the time delay combinations pattern of setting under the control of front end general controller (6), forms the launching electromagnetic wave bundle in underground scanning.
Constitute principal and subordinate's control system by computing machine, TMS320C31, TMS320F206 and TMS320F240.Computing machine is by the control of interface realization to system, and the storage and the flow field of finishing data simultaneously show; Finish the A/D conversion by TMS320C31 as the data collecting card of processor, recording channel is put in order and by serial ports radar host computer is controlled; TMS320F206 is as the controller of radar host computer, and the order that receives host computer realizes the setting of duty such as the non-linear amplification, filtering to the radar received signal.TMS320F240 is the core of front controller, finishes the control of launching beam scanning and the control of received signal equivalence sampling.
Whole hardware system is divided into front-end and back-end two parts, and the rear end is carried out State Control by RS232 (8) interface to front end, and front end is delivered to radar host computer (1) with radar echo signal by cable (9).In the course of work, front end moves, the back-end location relative fixed.
Use principle is as follows:
The impulse source of each transmission channel is under the control of delay control circuit, and amount of delay on request triggers respectively, through emitting antenna to underground radiated electromagnetic wave.(this direction requires corresponding with certain time-delay combination) makes each the unit radiated electromagnetic wave that has relative time delay originally on desired direction in space, arrives simultaneously near field range, interferes enhancing because of homophase, forms the near field narrow beam on this direction.Set in advance a plurality of different direction in spaces (corresponding to a plurality of different delayed time settings), repeat said process and realize the scanning of launching electromagnetic wave bundle.
Reception gust each passage does not have relative time delay on circuit, adopt software mode that the reception echo of each antenna element is carried out relative time delay, realizes the respective phase compensation and formation reception narrow beam and scanning thereof.
Claims (1)
1, a kind of emission scan Method in Phased-array Ground-penetrating Radar, it is characterized in that by radar host computer (1), launching antenna array (2), hyperchannel emission machine (3), receiving antenna array (4), multichannel receiver (5), front end general controller (6) and portable integrated industrial computer (7) are formed, RS232 control line (8) two ends connect portable integrated industrial computer (7) and front end general controller (6) respectively, radar return cable (9) two ends connect radar host computer (1) and front end general controller (6) respectively, front end general controller (6) links to each other with multichannel receiver (5) with hyperchannel emission machine (3) respectively by cable, hyperchannel emission machine (3) is corresponding with launching antenna array (2) to link to each other, multichannel receiver (5) is corresponding with receiving antenna array (4) to link to each other, and portable integrated industrial computer (7) links to each other with radar host computer (1);
The emission hardware system mainly is made up of launching antenna array (2) and corresponding hyperchannel emission machine (3), launching antenna array (2) forms plane, Unit 16 square formation in 4 * 4 modes, hyperchannel emission machine (3) is 16 passages, and each channel transmitter (31) links to each other with each transmission antenna unit (21) is corresponding one by one; Each channel transmitter (31) mainly forms by two avalanche transistors are in parallel;
Receiving hardware system is made up of receiving antenna array (4) and corresponding multichannel receiver (5), receiving antenna array (4) forms plane, Unit 16 square formation in 4 * 4 modes, multichannel receiver (5) is 16 passages, and each passage receiver (51) links to each other with each receiving antenna unit (41) is corresponding one by one; Each passage receiver (51) is mainly formed by four pipe bridge formula balance gates;
The circle ring sector radiant rays design of low section is all adopted in each transmission antenna unit (21) and receiving antenna unit (41), forms broadband circle polarized radiation and reception;
Under the control of front end general controller (6), each channel transmitter (31) triggers by the time delay combinations pattern of setting, in underground formation beam scanning.
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| CNB2004100573160A CN1310041C (en) | 2004-08-27 | 2004-08-27 | Emission scanning phased array ground detecting radar |
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| CNB2004100573160A CN1310041C (en) | 2004-08-27 | 2004-08-27 | Emission scanning phased array ground detecting radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101872018A (en) * | 2010-06-04 | 2010-10-27 | 武汉天毅达电子科技有限公司 | Wireless ground penetrating radar system |
| CN102012221B (en) * | 2010-10-27 | 2012-07-04 | 中公高科养护科技股份有限公司 | Ground penetrating radar-based pavement crack depth nondestructive test method |
| CN102466812B (en) * | 2010-11-10 | 2013-09-18 | 中国科学院地质与地球物理研究所 | Phased array spark subsource for seismic exploration |
| CN104569947B (en) * | 2015-01-04 | 2017-07-04 | 信息产业部电子第二十二研究所青岛分所 | A kind of multi-channel data real time integrating method of GPR |
| CN109187643A (en) * | 2018-06-25 | 2019-01-11 | 国网福建省电力有限公司宁德供电公司 | A kind of transmission tower column foot gap measurement device based on wide-angle mensuration |
| CN109683159B (en) * | 2018-12-25 | 2023-06-09 | 上海匀羿电磁科技有限公司 | Vehicle-mounted section scanning ultra-wideband radar orientation method |
| CN109856683B (en) * | 2019-01-07 | 2020-06-16 | 吉林大学 | Towed phased array electromagnetic detection device and method |
| CN111141764A (en) * | 2020-01-06 | 2020-05-12 | 上海市建筑科学研究院有限公司 | Ground penetrating radar detection device and method for external thermal insulation system |
| 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 |
| CN113589279A (en) * | 2021-07-16 | 2021-11-02 | 山东大学 | Phased array geological radar and method for detecting tunnel lining structure diseases |
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| CN2441229Y (en) * | 2000-09-14 | 2001-08-01 | 武汉大学 | Phase array antennas for transmitting/receiving of HF earth-wave radar |
| US6621448B1 (en) * | 2002-04-05 | 2003-09-16 | The Regents Of The University Of California | Non-contact radar system for reconstruction of scenes obscured under snow and similar material |
| CN2746405Y (en) * | 2004-08-27 | 2005-12-14 | 长江水利委员会长江工程地球物理勘测研究院(武汉) | Launching scanning phased array detection ground laser |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2441229Y (en) * | 2000-09-14 | 2001-08-01 | 武汉大学 | Phase array antennas for transmitting/receiving of HF earth-wave radar |
| US6621448B1 (en) * | 2002-04-05 | 2003-09-16 | The Regents Of The University Of California | Non-contact radar system for reconstruction of scenes obscured under snow and similar material |
| CN2746405Y (en) * | 2004-08-27 | 2005-12-14 | 长江水利委员会长江工程地球物理勘测研究院(武汉) | Launching scanning phased array detection ground laser |
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