NL2006587C2 - Ground penetrating radar with control unit in antenna dead zone. - Google Patents

Ground penetrating radar with control unit in antenna dead zone. Download PDF

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Publication number
NL2006587C2
NL2006587C2 NL2006587A NL2006587A NL2006587C2 NL 2006587 C2 NL2006587 C2 NL 2006587C2 NL 2006587 A NL2006587 A NL 2006587A NL 2006587 A NL2006587 A NL 2006587A NL 2006587 C2 NL2006587 C2 NL 2006587C2
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NL
Netherlands
Prior art keywords
antenna
control unit
receiving antenna
bottom radar
transmitting
Prior art date
Application number
NL2006587A
Other languages
Dutch (nl)
Inventor
Paulus Benedictus Roest
Original Assignee
Groundtracer B V
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Publication date
Application filed by Groundtracer B V filed Critical Groundtracer B V
Priority to NL2006587A priority Critical patent/NL2006587C2/en
Application granted granted Critical
Publication of NL2006587C2 publication Critical patent/NL2006587C2/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/0209—Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/14—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electron or nuclear magnetic resonance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H01Q1/525—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between emitting and receiving antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/15—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat

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  • Remote Sensing (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Description

No. NLP188880A
Ground penetrating radar with control unit in antenna dead zone
BACKGROUND
The invention relates to an improved ground penetrating radar (GPR). Ground penetrating radars have been 5 used successfully in the past for finding underground discontinuities. Using GPR, archeological sites have been investigated without excavating the site or otherwise damaging underground structures, construction sites have been checked for underground anomalies that might interfere 10 with construction, and utility companies have pinpointed underground pipes and cables for which the locations were inaccurate or unknown. US patent 3,831,173 discloses a ground radar system for locating underground objects, such as pipes, utility lines, culverts, ledges and like kinds of 15 underground discontinuities, including voids to depths in excess of 10 feet (ca. 3.05 m), the system including a basic radar having a special antenna design which launches radiation that penetrates the earth and receives reflections from underground discontinuities for recordation in a moving 20 vehicle.
To reduce the influence of external radiation on GPR readings, i.e. radiation not generated by a transmit 2 antenna and transmitted thereby into the ground, GPR transmit and receive antennas are typically conductively connected via resistors to a respective electromagnetic shieldings, said shieldings usually comprising a conductive 5 material. In practice however, some external radiation still reaches the transmit and/or receive antennas and influences the readings, in particular when the electromagnetic shielding, which is conductively coupled to the transmit and receive antennas, acts as an antenna as well.
10 The accuracy of the readings provided by the ground penetrating radar is further negatively affected by internal electromagnetic radiation originating from electrical components of the ground penetrating radar itself, in particular by a control unit adapted for 15 producing a signal to be transmitted into the ground by the transmit antenna.
It is an object of the present invention to provide a ground penetrating radar capable of providing readings which are substantially less affected by internal 20 electromagnetic radiation.
SUMMARY OF THE INVENTION
25 To this end, according to a first aspect, the present invention provides a ground penetrating radar (GPR) having a base plane for facing the ground when in use, said GPR comprising a transmit antenna for transmitting a signal into the ground, a receive antenna for receiving a reflected 30 signal from the ground, a control unit for supplying the transmit antenna with power, and an electromagnetic shielding, the transmit and/or receive antenna being located substantially between the base plane and the electromagnetic shielding, wherein the control unit is arranged within an 35 antenna dead zone of the receive antenna. An antenna dead zone comprises an area or volume within close range of the antenna in which its transmit and/or receive capabilities 3 are strongly reduced. During a scan, the control unit produces a pulse of radar energy, which is amplified and transmitted into the ground at a specific frequency by the transmit antenna. As, according to the present invention, 5 the control unit is located within a dead zone of the receive antenna, any electromagnetic radiation emitted by the control unit will be strongest inside the dead zone, where reception capability of the receive antenna is low. Thus, the signals received by the receive antenna will be 10 relatively free from distortion caused by internal electromagnetic radiation.
In a preferred embodiment the ground penetrating radar is a unit adapted to be moveable across the ground for providing measurements of subsurface structures.
15 In an embodiment the transmit antenna comprises a dead zone which substantially coincides with the dead zone of the receive antenna, such that pickup of electromagnetic radiation emitted by the control unit by the transmit antenna is substantially reduced. In other words, the 20 control unit is arranged within an antenna dead zone of the receive as well as within an antenna dead zone of the transmit antenna. Thus distortion of the transmitted signal by electromagnetic radiation of the control unit is substantially reduced as well, in turn resulting in more 25 accurate readouts.
In an embodiment said control unit is an active electronic component, and said GPR further comprises further active electronic components, which are substantially all arranged within said dead zone of the receive antenna. Any 30 electromagnetic radiation emitted by these further active electronic components will thus be strongest in an area where reception by the receive and/or transmit antenna is low. Herein, active electronic components typically comprise components which consume or emit relatively large amounts of 35 power in order to work, such as the control unit, a power supply, and/or a communication unit, and/or components which emit relatively high power electromagnetic radiation at one 4 or more frequencies which interfere with signals transmitted and/or received by the transmit and/or receive antenna respectively.
In an embodiment the electromagnetic shielding 5 comprises a first electromagnetic shielding substantially enveloping the receive antenna in all directions except the direction facing the base plane, and a second electromagnetic shielding separate from said first electromagnetic shielding and substantially enveloping the 10 transmit antenna in all directions except the direction facing the base plane. The shieldings themselves may act as antennas. The present invention substantially prevents signals transmitted by the first and second shielding in a direction other than into the ground, from reaching the 15 transmit and receive antenna respectively. Preferably the first and second electromagnetic shielding are connected to each other via a coaxial cable, i.e. via a coaxially shielded cable.
In an embodiment the electromagnetic shielding 20 further comprises a third electromagnetic shielding substantially enveloping the control unit and/or further active electronic components, and conductively connected to the first and/or second electromagnetic shielding. The third electromagnetic shielding substantially prevents radiation 25 emitted by the control unit and/or further active electronic components from reaching the transmit and/or receive antenna, and, likewise substantially prevents radiation originating from the transmit and/or receive antenna from reaching the control unit and/or further electronic 30 components, thus improving accuracy of readouts by the ground penetrating radar. The third electromagnetic shielding is preferably connected to the first and/or second electromagnetic shielding via a coaxial cable. These coaxial cables are preferably connected to the outward facing sides 35 of the shieldings, i.e. the sides of the first, second and third facing away from the receive antenna, the transmit antenna and the control unit first and/or further active 5 electronic components respectively.
In an embodiment the further active electronic components are arranged on a side of the electromagnetic shielding opposite to said base plane. The shielding thus 5 reduces the amount of electromagnetic radiation emitted by the further active electronic components that may reach the transmit and/or receive antenna.
In an embodiment the further active electronic components comprise a power supply, for supplying power to 10 the control unit and said further active electronic components. The power supply preferably comprises a rechargeable battery arranged within the antenna dead zone of the receive antenna, preferably arranged within an antenna dead zone of the transmit antenna as well.
15 In an embodiment the further active electronic components comprise a communication unit, for transmitting data representative of signals received by the receive antenna to a remote device. Thus the communication unit is arranged within the antenna dead zone of the receive 20 antenna, and preferably arranged within an antenna dead zone of the transmit antenna as well, such that electromagnetic radiation emitted by the communication unit originates from within a dead zone thereof. Preferably the remote device is adapted for processing said data and for displaying said 25 processed data to provide a visual indication of structures beneath the GPR. In an embodiment the remote device is connected to the GPR by means of an optical fiber, or by means of a conductive cable.
In an embodiment said communication unit comprises 30 a wireless communication unit, such as a WiFi transmitter. A conductive connection, which itself may act as an antenna, between the GPR and the remote device may thus be omitted, further reducing the influence of external radiation on the measurements. The data transmitted by the communication unit 35 may be transmitted to either a single remove device or to multiple remote devices, wherein said remote device or devices may process all or a part of said data. Preferably 6 the remote devices are handheld devices comprising a display for displaying the processed data in real time during use of the GPR.
In an embodiment the control unit is further 5 connected to the receive antenna and adapted for digitizing signals received by the receive antenna. The digitized signals, which comprises data representative signals received by the receive antenna, may then be transmitted to a remote device by the wireless communication unit which is 10 connected to the control unit.
In an embodiment the GPR further comprises a housing in which the control unit, the transmit antenna and receive antenna are comprised, wherein portions of said housing outside of the antenna dead zone are substantially 15 completely comprised of a non-conductive material. Thus, the housing substantially does not act as an antenna. Preferably the entire housing is comprised of a non-conductive material.
In an embodiment the transmit and/or receive 20 antenna is conductively coupled to the electromagnetic shielding, preferably via resistors.
In an embodiment the GPR further comprises a displacement and/or position detector for detecting a displacement and/or position of the GPR, and wherein said 25 communication unit is further adapted for transmitting said detected displacement and/or position to said remote device. A subsurface map of an area surveyed using the GPR may thus be constructed.
In an embodiment the receive antenna has a 30 longitudinal axis, and the antenna dead zone is defined as a volume bounded by two planes normal to said longitudinal axis. In a preferred embodiment a distance between said two planes is approximately one sixth of the length of the antenna along its longitudinal axis. Preferably the two 35 planes are positioned substantially equidistant to a centerpoint of said antenna.
In an embodiment the control unit and/or further 7 active electronic components, when projected on the base plane, are arranged within said base plane within a volume bounded by two further planes perpendicular to the base plane, wherein a first plane of the two further planes 5 contains the longitudinal axis of the receive antenna, and wherein a second plane of the two further planes contains a longitudinal axis of the transmit antenna. Preferably the control unit is arranged close to the transmit and/or receive antenna, e.g. at a distance of 40 cm or less 10 thereof.
In an embodiment the control unit is arranged with its longitudinal axis substantially coinciding with a line connecting a midpoint of the longitudinal axis of the receive antenna and a midpoint of a longitudinal axis of the 15 transmit antenna.
According to a second aspect the present invention provides a ground penetrating radar (GPR) assembly comprising a ground penetrating radar having a base plane for facing the ground when in use, said GPR comprising a 20 transmit antenna for transmitting a signal into the ground, a receive antenna for receiving a reflected signal from the ground, a control unit for supplying the transmit antenna with power, a communication unit for transmitting data representative of signals received by the receive antenna to 25 a remote device, and an electromagnetic shielding, the transmit and/or receive antenna being located substantially between the base plane and the electromagnetic shielding, wherein the control unit is arranged within an antenna dead zone of the receive antenna, said assembly further 30 comprising a remote device adapted for receiving and processing said data transmitted by the communication unit, wherein said remote device is further adapted for displaying said processed data.
The various aspects and features described and 35 shown in the specification can be applied, individually, wherever possible. These individual aspects, in particular the aspects and features described in the attached 8 dependent claims, can be made subject of divisional patent applications .
5 BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be elucidated on the basis of an exemplary embodiment shown in the attached drawings, in which: 10 Figure 1 shows a schematic bottom view of a prior art ground penetrating radar, wherein the control unit extends outside of a dead zone of the receive antenna, figure 2 shows a schematic bottom view of a ground penetrating radar according to the present invention, 15 figure 3 shows an isometric view of a receive antenna and its dead zone, figure 4 shows an isometric view of a ground penetrating radar according to the present invention.
20
DETAILED DESCRIPTION OF THE INVENTION
25 A bottom view of a prior art ground penetrating radar 100 is shown in figure 1, having a base plate 101 which is show partially cut away which defines a base plane for facing the ground when the GPR is in use. The GPR 100 comprises a bow-tie transmit antenna 110 for transmitting an 30 electrical signal into the ground. The transmit antenna is conductively connected via resistors 112 to a shielding 111 comprising a conductive material and substantially enveloping the transmit antenna in all directions except the direction facing the base plane. The transmit antenna has a 35 longitudinal axis 113 which is substantially perpendicular to a preferred direction of movement D for the GPR. A control unit 150, which produces and regulates a pulse or 9 frequency of radar energy , is connected via supply wire 116, printed circuit board 114 and wires 115 to the transmit antenna, which amplifies and transmits the signal into the ground.
5 The GPR further comprises a bow-tie receive antenna 130 for receiving reflections of the transmitted signal. The receive antenna comprises a conductive shielding 131 distinct from shielding 111, which substantially envelops the receive antenna in all directions except the 10 direction facing the base plane. The shielding 131 is conductively connected to the receive electrode via resistors 132. The signal received by the receive antenna is transmitted through wires 135 to printed circuit board 134, which in turn is connected to processing unit for processing 15 the received reflections of the transmitted signal. The receive antenna has a longitudinal axis 133 substantially parallel to the longitudinal axis 113 of the transmit antenna, such that the two antennas are substantially aligned.
2 0 The signal that is produced by the control unit 150 and is transmitted into the ground by the transmit antenna 110 typically has a frequency between 150 to 750 MHz, such that the control unit typically emits a wide range of high frequency electromagnetic radiation which can be 25 picked up by the transmit and/or receive antenna, reducing the accuracy of the readouts.
Figure 2 shows a bottom view of a ground penetrating radar 200 according to the present invention with its base plate removed and in which a control unit 250 30 is arranged within an antenna dead zone Dz of receive antenna 230. Note that the control unit 250 has a length which is substantially larger than a width of a dead zone Dz of the receive antenna. The control unit comprises an electromagnetic shielding 251, which is conductively 35 connected to first electromagnetic shielding 211 and to second electromagnetic shielding 231 via coaxial cables 216,236 respectively. In figure 2 the elements referred to 10 with numbers 210,211,212,213,214,215 and 230,231,232,233,234,235, correspond to reference numbers 110,111,112,113,114,115 and 130,131,132,133,134,135 respectively of figure 1. Both the transmit antenna and the 5 receive antenna have their antenna dead zones within the region Dz, i.e. within a volume bounded by parallel planes A and B. Thus, the transmit antenna 210 and receive antenna 230 are substantially shielded from undesired electromagnetic radiation by first and second 10 electromagnetic shieldings 211, 231 respectively.
Additionally, due to the placement of the control unit 250 relative to the antennas, both antennas are relatively insensitive to electromagnetic radiation emitted by the control unit.
15 Figure 3 shows an isometric view of section of figure 2 comprising the receive antenna 230. The electromagnetic shielding 231 substantially envelopes the receive antenna 230, except for a side of the antenna facing the ground or base plane XY. A signal wire 238 runs from the 20 printed circuit board 234 through a hole 237 in the shielding 231, towards a communication unit 160, here depicted schematically. A coaxial cable 236 is attached to the outside of the electromagnetic shielding 231, and conductively connects said shielding to a shielding 251 of 25 the control unit, here also depicted schematically. The antenna dead zone Dz for the receive antenna is bounded by two planes parallel to the XZ plane and has a width of approximately one sixth of the length L of the receive antenna along its longitudinal axis. Though in the 30 embodiment shown the receive antenna is of the bow-tie type, any kind of receive and/or transmit antenna may be used having a dead zone sufficiently large to place a control unit there within.
Figure 4 shows an ground penetrating radar 35 assembly according to the invention, comprising a ground penetrating radar 200 as described herein, and a remote device 300 adapted for receiving, processing and displaying 11 data representative of signals received by the receive antenna. The ground penetrating radar comprises a housing 180 with a handle 181, both the housing and handle being made of a substantially non-conductive material, such as 5 plastic. The control unit 250 is arranged on top of the housing 180 and provided with power by a power supply 160 which is a battery arranged on top of the control unit. Alternatively the power supply and other active electronic components may be arranged next to or below the control unit 10 250, as long as they are arranged within the antenna dead zone. The GPR further comprises a communication unit 170, in this case a WiFi transmitter, connected to the receive antenna and adapted for transmitting data representative of the signals received thereby to the remote device 300. 15 During use of the GPR a person would typically pull the GPR across the ground in the X direction while watching a graph representative of the received signals vs. location of the GPR on the display 301 of the remote device.
The GPR further comprises three wheels 183, one of 20 which is provided with a displacement detector 184 which passes on a measured displacement to the communication unit for transmitting the measured displacement along with the data representative of the received signal to the remote device 300. In the embodiment shown, the displacement 25 detector is a rotation counter arranged outside of the dead zone of the receive antenna. Preferably any conductive cable leading from the displacement detector to the control unit 250 or to the communication unit 170, is surrounded by small magnets to minimize the effect that this cable starts 30 transmitting data itself. As the displacement detector is a low-power component it does not substantially influence readings by the ground penetrating radar. Alternatively, the displacement detector may be arranged within the antenna dead zone Dz as well.
35 In summary, the present invention relates to a ground penetrating radar comprising a receive antenna and a transmit antenna, further comprising a control unit for 12 producing and regulating a signal or pulse to be transmitted by the transmit antenna, wherein said control unit is arranged within a dead zone of the receive antenna, preferably within a dead zone of the transmit antenna as 5 well. Readings of a reflections of the transmit signal are substantially less distorted by electromagnetic radiation emitted by the control unit. In a preferred embodiment substantially all further active electronic components of the ground penetrating radar are arranged within the antenna 10 dead zone.
It is to be understood that the above description is included to illustrate the operation of the preferred embodiments and is not meant to limit the scope of the invention. In particular it will be appreciated that 15 throughout the application the phrase "ground" may be interpreted as "subsurface". From the above discussion, many variations will be apparent to one skilled in the art that would yet be encompassed by the spirit and scope of the present invention.

Claims (16)

1. Bodemradar met een tijdens gebruik naar de grond toe te keren basisvlak, waarbij de bodemradar een uitzendantenne omvat voor het uitzenden van een signaal naar in de grond, een ontvangstantenne voor het ontvangen van een 5 gereflecteerd signaal vanaf de grond, een aanstuureenheid voor het van vermogen voorzien van de uitzendantenne, en een elektromagnetische afscherming, waarbij de uitzend- en/of ontvangstantenne in hoofdzaak tussen het basisvlak en de elektromagnetische afscherming zijn geplaatst, 10 waarbij de aanstuureenheid is geplaatst binnenin een antenne dode zone van de ontvangstantenne.1. Bottom radar with a base surface to be turned towards the ground during use, the bottom radar comprising a transmitting antenna for transmitting a signal to the ground, a receiving antenna for receiving a reflected signal from the ground, a control unit for powered with the transmitting antenna, and an electromagnetic shield, wherein the transmitting and / or receiving antenna is positioned substantially between the base surface and the electromagnetic shield, the control unit being located within an antenna dead zone of the receiving antenna. 2. Bodemradar volgens conclusie 1, waarin de uitzendantenne een dode zone omvat die in hoofdzaak samenvalt met de dode zone van de ontvangstantenne.A bottom radar according to claim 1, wherein the broadcast antenna comprises a dead zone that substantially coincides with the dead zone of the receiving antenna. 3. Bodemradar volgens één der voorgaande conclusies, waarin de aanstuureenheid een actieve elektronische component is, en waarin de bodemradar verder omvat verdere actieve elektronische componenten, die in hoofdzaak allen binnenin de dode zone van de 20 ontvangstantenne zijn geplaatst.3. Bottom radar as claimed in any of the foregoing claims, wherein the control unit is an active electronic component, and wherein the bottom radar further comprises further active electronic components, which are substantially all located within the dead zone of the receiving antenna. 4. Bodemradar volgens één der voorgaande conclusies, waarin elektromagnetische afscherming een eerste elektromagnetische afscherming omvat die de ontvangstantenne in hoofdzaak in alle richtingen behalve de naar het 25 basisvlak gekeerde richting omhult, en een tweede elektromagnetische afscherming afzonderlijk van de eerste elektromagnetische afscherming en die de uitzendantenne in hoofdzaak in alle richtingen behalve de naar het basisvlak gekeerde richting omhult.4. Bottom radar as claimed in any of the foregoing claims, wherein electromagnetic shielding comprises a first electromagnetic shielding which substantially envelopes the receiving antenna in all directions except the direction towards the base surface, and a second electromagnetic shielding separate from the first electromagnetic shielding and which comprises the transmitting antenna substantially in all directions except the direction facing the base plane. 5. Bodemradar volgens conclusie 4, waarin de elektromagnetische afscherming verder een derde elektromagnetische afscherming omvat die de aanstuureenheid en/of verdere actieve elektronische componenten in hoofdzaak omhult, en geleidend verbonden is met de eerste en/of tweede elektromagnetische afscherming.The bottom radar according to claim 4, wherein the electromagnetic shield further comprises a third electromagnetic shield that substantially encloses the control unit and / or further active electronic components, and is conductively connected to the first and / or second electromagnetic shield. 6. Bodemradar volgens één der voorgaande 5 conclusies, waarin de verdere actieve elektronische componenten een voeding omvatten, voor het verschaffen van voeding aan de aanstuureenheid en de verdere actieve elektronische componenten.A bottom radar according to any one of the preceding claims, wherein the further active electronic components comprise a power supply, for supplying power to the control unit and the further active electronic components. 7. Bodemradar volgens één der voorgaande 10 conclusies, waarin de verdere actieve elektronische componenten een communicatie-eenheid omvatten, voor het verzenden van gegevens die representatief zijn voor signalen die zijn ontvangen door de ontvangstantenne, naar een inrichting op afstand.7. Bottom radar as claimed in any of the foregoing claims, wherein the further active electronic components comprise a communication unit, for transmitting data representative of signals received by the receiving antenna, to a remote device. 8. Bodemradar volgens conclusie 7, waarin de communicatie-eenheid een draadloze communicatie-eenheid omvat.The bottom radar of claim 7, wherein the communication unit comprises a wireless communication unit. 9. Bodemradar volgens conclusie 7 of 8, verder omvattend een verplaatsings- en/of positiedetector, voor het 20 detecteren van een verplaatsing en/of positie van de bodemradar, en waarin de communicatie-eenheid verder is ingericht voor het verzenden van de gedetecteerde verplaatsing en/of positie naar de inrichting op afstand.9. Bottom radar according to claim 7 or 8, further comprising a displacement and / or position detector, for detecting a displacement and / or position of the bottom radar, and wherein the communication unit is further adapted to transmit the detected displacement and / or position to the remote device. 10. Bodemradar volgens één der voorgaande 25 conclusies, verder omvattend een behuizing waarin de aanstuureenheid, de uitzendantenne en ontvangstantenne zijn omvat, waarbij gedeelten van de behuizing buiten de dode antenne zone in hoofdzaak volledig zijn gemaakt van een niet-geleidend materiaal.10. Bottom radar according to any one of the preceding claims, further comprising a housing in which the control unit, the transmitting antenna and receiving antenna are included, wherein parts of the housing outside the dead antenna zone are substantially completely made of a non-conductive material. 11. Bodemradar volgens één der voorgaande conclusies, waarin de uitzend- en/of ontvangstantenne geleidend gekoppeld is aan de elektromagnetische afscherming, bij voorkeur via weerstanden.A bottom radar according to any one of the preceding claims, wherein the transmitting and / or receiving antenna is conductively coupled to the electromagnetic shield, preferably via resistors. 12. Bodemradar volgens één der voorgaande 35 conclusies, waarin de ontvangstantenne een longitudinale as heeft, en waarin de dode zone van de antenne gedefinieerd is als een volume begrensd door twee vlakken normaal ten opzichte van de longitudinale as.12. Bottom radar according to any one of the preceding claims, wherein the receiving antenna has a longitudinal axis, and wherein the dead zone of the antenna is defined as a volume bounded by two planes normal to the longitudinal axis. 13. Bodemradar volgens conclusie 12, waarin de aanstuureenheid en/of verder actieve elektronische componenten, wanneer geprojecteerd op het basisvlak, zijn 5 gerangschikt binnenin het basisvlak binnenin een volume dat is begrensd door twee verdere vlakken loodrecht op het basisvlak, waarin een eerste vlak van de twee verdere vlakken de longitudinale as van de ontvangstantenne omvat, en waarin een tweede vlak van de twee verdere vlakken een 10 longitudinale as van de uitzendantenne omvat.13. Bottom radar as claimed in claim 12, wherein the control unit and / or further active electronic components, when projected on the base plane, are arranged within the base plane within a volume bounded by two further planes perpendicular to the base plane, wherein a first plane of the two further planes comprise the longitudinal axis of the receiving antenna, and wherein a second plane of the two further planes comprises a longitudinal axis of the transmitting antenna. 14. Bodemradar volgens conclusie 12 of 13, waarin de aanstuureenheid is geplaatst met zijn longitudinale as in hoofdzaak samenvallend met een lijn die een middelpunt van de longitudinale as van de ontvangstantenne en een 15 middelpunt van een longitudinale as van de uitzendantenne verbindt.14. Bottom radar according to claim 12 or 13, wherein the control unit is placed with its longitudinal axis substantially coincident with a line connecting a center point of the longitudinal axis of the receiving antenna and a center point of a longitudinal axis of the broadcasting antenna. 15. Bodemradar volgens één der voorgaande conclusies, waarin de aanstuureenheid is verbonden met de ontvangstantenne en verder is ingericht voor het 20 digitaliseren van signalen die zijn ontvangen door de ontvangstantenne.15. A bottom radar according to any one of the preceding claims, wherein the control unit is connected to the receiving antenna and is further adapted to digitize signals received by the receiving antenna. 16. Bodemradarsamenstel omvattend een bodemradar met een tijdens gebruik naar de grond toe te keren basisvlak, waarbij de bodemradar een 25 uitzendantenne omvat voor het uitzenden van een signaal naar in de grond, een ontvangstantenne voor het ontvangen een gereflecteerd signaal vanaf de grond, een aanstuureenheid voor het van vermogen voorzien van de uitzendantenne, een communicatie-eenheid voor het verzenden van gegevens 30 representatief van signalen die zijn ontvangen door de ontvangstantenne naar een inrichting op afstand, en een elektromagnetische afscherming, waarbij de uitzend- en/of ontvangstantenne in hoofdzaak tussen het basisvlak en de elektromagnetische afscherming zijn geplaatst, 35 waarbij de aanstuureenheid is gerangschikt binnenin een antenne dode zone van de ontvangstantenne, waarbij het samenstel verder omvat: een inrichting op afstand ingericht voor het ontvangen en verwerken van de gegevens uitgezonden door de communicatie-eenheid, waarbij de inrichting op afstand verder is ingericht voor het weergeven van de verwerkte 5 gegevens. -o-o-o-o-o-o-o-o-16. Bottom radar assembly comprising a bottom radar with a base surface to be turned towards the ground during use, the bottom radar comprising a transmitting antenna for transmitting a signal to the ground, a receiving antenna for receiving a reflected signal from the ground, a control unit for powering the broadcasting antenna, a communication unit for transmitting data representative of signals received by the receiving antenna to a remote device, and an electromagnetic shielding, the transmitting and / or receiving antenna being substantially between the base surface and the electromagnetic shield are positioned, the control unit being arranged within an antenna dead zone of the receiving antenna, the assembly further comprising: a remote device adapted to receive and process the data transmitted by the communication unit, the device at dist and further adapted to display the processed data. -o-o-o-o-o-o-o-
NL2006587A 2011-04-12 2011-04-12 Ground penetrating radar with control unit in antenna dead zone. NL2006587C2 (en)

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NL2034441B1 (en) 2023-03-27 2024-10-02 Vws Verbindingen & Netwerken B V Utility depth and size determination using ground penetrating radar

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WO2004042427A1 (en) * 2002-11-05 2004-05-21 3D-Radar As Antenna system for georadar
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