CN111580094A - Anti-interference radar antenna and anti-interference low-frequency ground penetrating radar system - Google Patents
Anti-interference radar antenna and anti-interference low-frequency ground penetrating radar system Download PDFInfo
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- CN111580094A CN111580094A CN202010553404.9A CN202010553404A CN111580094A CN 111580094 A CN111580094 A CN 111580094A CN 202010553404 A CN202010553404 A CN 202010553404A CN 111580094 A CN111580094 A CN 111580094A
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- 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
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
- G01S7/2928—Random or non-synchronous interference pulse cancellers
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/34—Gain of receiver varied automatically during pulse-recurrence period, e.g. anti-clutter gain control
Abstract
The invention provides an anti-interference radar antenna and an anti-interference low-frequency ground penetrating radar system. The radar antenna includes: the metal back cavity is provided with a V-shaped cavity structure, and the anti-interference radar antenna is arranged under the metal back cavity. The anti-interference radar antenna and the anti-interference low-frequency ground penetrating radar system provided by the invention overcome the problems of low anti-interference capability, shallow detection depth, inconvenience in exploration and the like when the existing low-frequency ground penetrating radar is applied in cities.
Description
Technical Field
The invention relates to the technical field of ground penetrating radars, in particular to an anti-interference radar antenna and an anti-interference low-frequency ground penetrating radar system.
Background
Since sixty years, the urbanization of China develops rapidly, with the rapid advance of the urbanization process, the development demand of urban underground space is continuously increased, and the development of underground space becomes an important strategy for the next stage of national development of China. Advanced detection and monitoring technical equipment is the key for leading the development of urban underground space, and the conventional urban underground space detection technology comprises geophysical methods such as ground penetrating radar, shallow earthquake, high-density electrical method, shallow transient electromagnetic method, interwell CT, micromotion and the like besides drilling. However, for the high-resolution detection of shallow geology of an urban underground space, particularly for the detection of shallow geological stratification, underground shelters, underground cavities, karst caves and the like within 30-50 meters, the ground penetrating radar technology has the advantages of being unique, high in resolution, high in detection efficiency and good in detection effect.
The existing conventional ground penetrating radar products, particularly low-frequency section ground penetrating radars, adopt non-shielding plate-shaped or rope-shaped structures, and do not shield the antenna backwards; the receiving and transmitting separation working mode is generally adopted, in order to quickly and effectively collect data, the transmitting signal and the receiving signal need to be synchronized between a receiving antenna and a transmitting antenna, at present, a cable or an optical fiber connection is mostly adopted to synchronize the signals, and then the cable is connected with a host computer to send commands and transmit data.
The existing conventional ground penetrating radar products, particularly low-frequency band non-shielding ground penetrating radars, are not special products developed aiming at the detection requirement of urban underground space, and have some defects when being applied to the detection of the urban underground space. First, the conventional low-frequency ground penetrating radar adopts a non-shielding plate-shaped or rope-shaped structure, an antenna is not shielded backwards, the radar emits electromagnetic waves to the ground and also to the air, when the electromagnetic waves radiated to the air meet the targets such as buildings, electric wires, telegraph poles, bridges and the like on the ground in a city, electromagnetic wave reflection/scattering is generated, and the reflected/scattered electromagnetic waves and the reflected/scattered waves generated by the underground geological targets are interwoven together to form interference and generate false information. Secondly, what conventional ground penetrating radar generally adopted is the mode of operation of receiving and dispatching separation, in order to carry out data acquisition fast effectual, need carry out the synchronization of transmitting signal and received signal between receiving antenna and transmitting antenna, adopt cable or optical fiber connection to carry out the synchronization of signal at present more, be connected through cable and host computer and carry out the sending of order and the transmission of data again, the connection of cable has increased the complexity and the degree of difficulty of system operation between ground penetrating radar each part, greatly restricted ground penetrating radar's convenience and flexibility.
Disclosure of Invention
The invention aims to solve the technical problems of providing an anti-interference radar antenna and an anti-interference low-frequency ground penetrating radar system, and solving the problems of low anti-interference capability, shallow detection depth, inconvenience in exploration and the like when the existing low-frequency ground penetrating radar is applied in cities.
In order to solve the above technical problem, the present invention provides an anti-interference radar antenna, including: the metal back cavity is provided with a V-shaped cavity structure, and the anti-interference radar antenna is arranged under the metal back cavity.
In some embodiments, the anti-jamming radar antenna has an antenna arm in a bowtie antenna structure, and a semi-elliptical slot structure is provided at an end of the antenna arm.
In some embodiments, at the sharpened portion of the semi-elliptical slotted structure, there is further provided: four resistors.
In some embodiments, the top surface of the V-shaped cavity has a rectangular metal surface in the middle.
In some embodiments, the rectangular metal plane is at a distance from the antenna surface.
In some embodiments, the two sides of the V-shaped cavity are two symmetrically arranged inclined planes, two symmetrical inclined planes, and side arms connecting the rectangular metal surface and the back cavity.
In addition, the invention also provides an anti-interference low-frequency ground penetrating radar system, which comprises: the anti-interference radar antenna comprises a transmitting antenna and a receiving antenna, wherein the transmitting antenna is used for transmitting ultra-wideband radar pulse signals, the receiving antenna is used for receiving ultra-wideband radar echo signals, and the transmitting antenna and the receiving antenna are the anti-interference radar antennas according to the above; the large-amplitude pulse transmitter is connected to the transmitting antenna and used for generating a periodic ultra-wideband radar pulse signal, and the ultra-wideband radar pulse signal has a large-amplitude characteristic; and the wireless synchronous receiver is connected to the receiving antenna and used for carrying out data sampling on the ultra-wideband radar echo signals received by the receiving antenna to obtain high-fidelity echo signals.
In some embodiments, the ultra-wideband radar pulse signal has an amplitude greater than 3000V.
In some embodiments, a wireless synchronization receiver comprises: the amplitude limiting protection circuit is used for carrying out amplitude limiting on the echo signal; the time gain circuit is connected to the amplitude limiting protection circuit and is used for carrying out variable gain amplification on the amplitude limiting signal; the first analog-to-digital conversion circuit is connected to the time gain circuit and used for performing analog-to-digital conversion on the gained signal; the signal buffer module is connected to the first analog-to-digital conversion circuit and used for buffering the signal processed by the first analog-to-digital conversion circuit; the fixed gain circuit is connected to the amplitude limiting protection circuit and is used for carrying out fixed gain on the amplitude limiting signal; the second analog-to-digital conversion circuit is connected to the fixed gain circuit and is used for performing analog-to-digital conversion on the signal after the fixed gain; and the synchronization module is connected to the second analog-to-digital conversion circuit and used for sending the internal data according to the internally set triggering condition.
In some embodiments, further comprising: and the PC upper computer is connected with the wireless synchronous receiver through a network interface and is used for communicating with the wireless synchronous receiver to obtain echo signals uploaded by the wireless synchronous receiver, processing and analyzing the echo signals and displaying processing and analyzing results, and the PC upper computer is communicated with the wireless synchronous receiver through LAN (local area network) or WiFi (wireless fidelity).
After adopting such design, the invention has at least the following advantages:
1. the transmitting antenna and the receiving antenna are respectively provided with a V-shaped backward shielding shell, so that various interference signals from the ground can be effectively shielded when the antenna works in an urban environment;
2. the pulse output amplitude of the transmitter is larger than 3000V, so that the detection depth is increased;
3. wireless synchronization between the transmitting unit and the receiving unit is realized through a high-speed real-time sampling mode, the flexibility of equipment operation is improved, and a synchronous cable between transmitting and receiving is eliminated;
4. the receiver and the upper PC can communicate in a LAN wired mode or a WIFI mode to issue commands and upload data, and convenience of equipment operation is improved.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic structural diagram of an anti-interference low-frequency ground penetrating radar system provided in an embodiment of the present invention;
FIG. 2 is a perspective view of an anti-jamming radar antenna and a shielding housing;
fig. 3 is a flow chart of a process for antenna synchronization of a ground penetrating radar system.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In one exemplary embodiment of the invention, an anti-jamming radar antenna and an anti-jamming low-frequency ground penetrating radar system are provided. Fig. 1 is a schematic structural diagram of an anti-interference low-frequency ground penetrating radar system suitable for urban underground space detection according to an embodiment of the present invention. Fig. 2 shows an anti-interference radar antenna and a shielding housing. Fig. 3 is a diagram of a wireless synchronization process of the ground penetrating radar system.
Referring to fig. 1, fig. 2 and fig. 3, an anti-interference low-frequency ground penetrating radar system suitable for detecting an urban underground space in the present embodiment includes: anti-interference radar antenna and shielding casing: the electromagnetic pulse shielding device is mainly used for completing the transmission and the reception of electromagnetic pulse signals and shielding backward interference signals; large amplitude pulse transmitter: the function of generating periodic pulse signals is mainly completed; the wireless synchronous receiver: the high-fidelity radar echo signal sampling is mainly realized, and is cached and sent to a PC upper computer; PC host computer: the radar data acquisition and storage device is mainly used for completing radar control and radar data acquisition, storage and display functions.
The following respectively describes each component of the anti-interference low-frequency ground penetrating radar system suitable for urban underground space detection in the embodiment in detail.
(1) Anti-interference radar antenna and shielding shell
The antenna arm used in this embodiment is a deformed dish antenna structure 101, as shown in fig. 2, both the transmitting antenna and the receiving antenna adopt such a form of antenna structure, the end slotted structure is as shown in fig. 2, a semi-elliptical slotted structure is adopted, and four resistors are respectively loaded on the sharpened part formed in the slotted structure to absorb the reflected current and suppress the trailing oscillation. In particular, the sharpened portion is a tip portion formed to between different slotted structures.
Because the planar butterfly antenna has the omnidirectional radiation characteristic similar to a dipole, a metal back cavity is required to be introduced to inhibit backward radiation and shield backward interference signals, the metal back cavity adopted in the embodiment is a V-shaped cavity structure 102, as shown in fig. 2, wherein the ultra-wideband butterfly transmitting antenna and the receiving antenna are installed right below the back cavity, a rectangular metal surface is arranged in the middle of the top surface of the V-shaped cavity 102 and has a certain distance from the surface of the antenna, and two symmetrical inclined surfaces are arranged on the side surfaces of the top surface to connect the rectangular metal surface and the side arms of the back cavity. The V-shaped cavity 102 will significantly reduce the voltage standing wave coefficient at low frequency, improving the time domain waveform fidelity. The adoption of the design of the V-shaped cavity 102 can reduce the overall size of the antenna, improve the radiation effect of the antenna, and has the advantages of difficult deformation and stronger rigidity.
Through the optimization of the antenna arm form, the tail end slotted structure, the form size of the metal back cavity, the loading resistance value, the feed interval and the like, the backward shielding, the efficient transmission of pulse signals and the high-sensitivity receiving of the low-frequency ground penetrating radar antenna are realized, and therefore the effective detection of deep geological target bodies in urban environments is realized.
(2) Large amplitude pulse transmitter
The large-amplitude pulse generating circuit is an external trigger exciting circuit and is triggered by the transmitting trigger control module to generate a pair of symmetrical positive-polarity pulse signals and negative-polarity pulse signals with the amplitude of +/-1500V, the pulse bottom width of 15-200 ns and the repetition frequency of 10 kHz.
Referring to the transmit channel 200 of fig. 1, the large-amplitude pulse transmitter includes: the device comprises a transmission trigger control module 201, a trigger driving circuit 202, a pulse generating circuit 203 and a high-voltage circuit 204. The transmission trigger control module 201 is connected with the receiver through Bluetooth, receives a starting command from the receiver and starts generation work of a pulse signal; the emission trigger control module 201 is connected to the trigger driving circuit 202, the trigger driving circuit 202 is connected to the pulse generating circuit 203, the high voltage circuit 204 is connected to the pulse generating circuit 203, and the pulse generating circuit 203 is finally connected to the emission antenna to radiate the generated pulse signal.
The present invention can also be realized by directly providing a pulse transmitter satisfying the above conditions from the outside without including the large-amplitude pulse transmitter circuit.
(3) Wireless synchronous receiver
In the anti-interference low-frequency ground penetrating radar system suitable for urban underground space detection, a wireless synchronous receiver carries out front-end processing on a radar echo signal recovered by a receiving antenna, then sends the radar echo signal into a radio frequency analog-to-digital converter for real-time sampling, and determines when to upload acquired data according to trigger voltage. The wireless synchronous receiver has 16-bit resolution, the highest sampling rate of 1GSPS, the input bandwidth of 1.2GHz and high signal-to-noise ratio, and the local noise of the wireless synchronous receiver can reach-159 dBFS/Hz. The detection sensitivity of the system is improved through the time-varying gain circuit at the front end, so that the dynamic range of the system is improved.
Referring to the receiving channel 300 in fig. 1, the wireless synchronization receiver includes: the digital signal processing circuit comprises a clipping protection circuit 301, a time gain circuit 302, a first analog-to-digital conversion circuit 303, a signal buffering module 304, a fixed gain circuit 305, a second analog-to-digital conversion circuit 306 and a synchronization module 307. The receiving antenna is connected to an amplitude limiting protection circuit 301, the amplitude limiting protection circuit 301 is connected to a time-varying gain circuit 302 and a fixed gain circuit 305, the time-varying gain circuit 302 is connected to a first analog-to-digital conversion circuit 303, the fixed gain circuit 305 is connected to a second analog-to-digital conversion circuit 306, the first analog-to-digital conversion circuit 303 is connected to a signal buffer module 304 inside an FPGA, the second analog-to-digital conversion circuit 306 is connected to a synchronization module 307 inside the FPGA, and data in the signal buffer module 304 is sent to a PC upper computer through a communication module 401 to be stored, displayed and processed by setting corresponding trigger conditions in the synchronization module 307.
(4) PC upper computer
In the anti-interference low-frequency ground penetrating radar system suitable for urban underground space detection, the PC upper computer stores and displays radar echo signals received by the wireless receiver from the receiving channel 300 and data sent by the sending channel 400, and issues various control commands so as to control the operation of the ground penetrating radar.
Please refer to the data transmission channel 400 in fig. 1, which includes a communication module 401 and a PC upper computer 402, wherein the communication module 401 and the PC upper computer 402 perform TCP/IP protocol communication in a wired/wireless manner through LAN/WIFI, the PC upper computer 402 serves as a host of TCP/IP, and the ground penetrating radar serves as a client of TCP/IP. The ground penetrating radar is communicated with the PC upper computer, a wired (LAN) mode can be selected, a Wireless (WIFI) mode can also be selected, the two modes are switched randomly, high-speed reliability of communication can be guaranteed, flexibility of equipment operation can be improved, and the equipment can adapt to a more severe working environment.
The working process of the anti-interference low-frequency ground penetrating radar system suitable for urban underground space detection is as follows:
the method comprises the following steps: after parameters are set in data acquisition software in the PC upper computer 402, the parameters and the starting command are sent to a receiver through a communication channel 400, the receiver communicates with the transmitter through Bluetooth, sends the starting command to the transmission triggering control module 201, sets corresponding transmission repetition frequency, and configures different transmission frequencies according to different configured antennas; the trigger driving circuit 202 receives a TTL trigger signal of the emission trigger control module, the TTL trigger signal is a square wave signal with the amplitude of 3.3V, the pulse width of 200ns and the repetition frequency of 10 kHz-100 kHz, and the trigger driving circuit 202 drives the trigger signal to obtain a pulse trigger signal with a smaller leading edge and sends the pulse trigger signal to the pulse generating circuit 203; the core of the pulse generating circuit 203 is a trigger type spark switch, positive and negative high voltages (+ -2500V) are generated through a high-voltage circuit 204, and when the trigger driving circuit 202 sends a shaped trigger signal, the trigger spark switch is instantaneously broken down to generate a pair of balanced Gaussian positive pulse signals and negative pulse signals; the signal is directly sent to the dipole transmitting antenna 101 as a feed signal, and the electromagnetic pulse signal is radiated out through the antenna; the V-shaped shielding cavity 102 shields the electromagnetic pulse signal radiated backward from the dipole transmitting antenna 101 while radiating the electromagnetic pulse signal outward, thereby avoiding introducing some interference information of the ground.
Step two: referring to fig. 3, the transmitted electromagnetic pulse signal is transmitted and reflected underground and then received by the receiving antenna 101, and the receiving antenna 101 sends the received echo signal to the amplitude limiting protection circuit 301 for amplitude limitation, so as to prevent the subsequent circuit from being burned out due to too strong direct wave, thereby playing a role of input protection; the signal after passing through the amplitude limiting protection circuit 301 is sampled in two paths, one path is used as a synchronous signal, and the other path is used as a data signal; signals sampled as data signals are firstly sent into a time-varying gain circuit 302 for amplification, the time-varying gain circuit 302 consists of a 6-bit numerical control attenuator, a low-pass filter and an amplifier, wherein the numerical control attenuator and the amplifier are cascaded to equivalently realize the function of the variable gain amplifier, the circuit can improve the signal-to-noise ratio of a receiver and can also increase the dynamic range of the receiver, the total gain of a front-end signal link of the whole receiver is-8-42 DB, and the working frequency range is DC-1.5 GHz; the signal after time-varying gain is sent to a first analog-to-digital conversion circuit 303 for conversion from analog quantity to digital quantity, the core of the analog-to-digital conversion circuit is a high-speed radio frequency signal analog-to-digital conversion chip, the analog-to-digital conversion chip has 16-bit resolution, the input bandwidth is 1.2GHz, the sampling rate can reach 1GSPS at most, and the data sampling requirement of a low-frequency ground penetrating radar (5 MHz-50 MHz) is completely met; the converted digital data is sent to a signal buffer module in the FPGA, the module is used for buffering data, a 16bits multiplied by 8192 dual-port RAM space is opened up for the module by utilizing rich on-chip resources of the FPGA, and the sent data is circularly stored from top to bottom, so that the continuity of the data is ensured; the signal as the synchronous signal for sampling is firstly sent to a fixed gain circuit 305 for fixed gain to ensure the consistency of the trigger condition, and then sent to a second analog-to-digital conversion circuit 306 for signal sampling, the core of the analog-to-digital conversion circuit is the same as that of the first analog-to-digital conversion circuit 303, the analog-to-digital conversion circuit is a high-speed radio frequency signal analog-to-digital conversion chip, the analog-to-digital conversion chip has 16-bit resolution, the input bandwidth is 1.2GHz, and the sampling rate can reach 1GSPS at most, so that the sampling consistency can be fully ensured, and the converted digital data is sent to a synchronous module 307; the data buffered by the synchronization module 307 is not stored in the RAM, but is stored as a temporary variable, the acquired data is continuously compared with a set threshold Sref, once the acquired data Sn is greater than Sref, a record enable signal RecEn mark of the signal buffer module in the sampling channel is enabled immediately, the data is recorded and stored in a middle position n of the RAM at the moment, and in order to ensure that the signal can be triggered stably in a repetition frequency period, namely only radar direct wave energy is triggered, the Sref is set to be as small as possible; recording an enabling position n from the RAM and addressing t bits forward, wherein the value of t can be set by data acquisition software through parameter issuing, and the purpose of the operation is to send complete direct wave information together as an initial position reference signal of a radar echo; and then continuing to store data into the RAM until the stored data amount reaches the set sampling point number N (N is less than or equal to 8192), stopping writing data into the RAM, latching the data recorded in the RAM, simultaneously starting a data transmission enabling signal SendEn, and starting transmission of the data.
Step three: after the data transmission is started, a data transmission pointer of the communication module 401 is set to the nth-t bit, and N data from the N-t bit in the RAM are transmitted to the PC upper computer 402 for storage and display through a network chip according to the number of sampling points transmitted by the PC upper computer 402; after N data transmission is finished, restarting data storage enabling, and sequentially storing data into the RAM from the next bit of the last record stopping position of the radar echo signal; when data communication is carried out through a network, wired network cables can be selected for communication, and wireless communication can also be carried out through WIFI, so that the convenience of equipment use is improved; the wired mode and the wireless mode are switched through the power on-off of the wireless communication module, when the power supply of the wireless communication module is switched on through an external switch, the FPGA judges and selects a communication link to the wireless communication module, otherwise, if the wireless communication module is not powered on, the FPGA judges through a mark and selects the communication link to the wired communication module; after the receiver and the PC upper computer 402 are successfully communicated, data acquisition software in the PC upper computer 402 issues a radar control command through a network and sets parameters, such as a dielectric constant, a sampling point number, a sampling frequency, a gain mode, a gain value, a trigger level, a time delay, an accumulation number, a measurement accuracy, a trigger mode, and the like.
Step four: after the parameters are sent and set, the equipment is started to collect data, and the data is received and recorded in the PC upper computer 402 in a wired or wireless mode, so that the whole process is completed, namely, the working process of the anti-interference low-frequency ground penetrating radar system suitable for urban underground space detection is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (10)
1. An anti-jamming radar antenna, comprising: the metal back cavity is provided with a V-shaped cavity structure, and the anti-interference radar antenna is arranged under the metal back cavity.
2. The anti-jamming radar antenna according to claim 1, wherein the anti-jamming radar antenna has an antenna arm in a bowtie antenna structure, and a semi-elliptical slot structure is provided at a distal end of the antenna arm.
3. The anti-jamming radar antenna according to claim 2, further configured with, in the sharpened portion of the semi-elliptical slotted structure: four resistors.
4. The tamper-resistant radar antenna of claim 1, wherein the top surface of the V-shaped cavity has a rectangular metal surface in the middle.
5. The anti-jamming radar antenna according to claim 4, characterized in that the rectangular metal face is at a distance from the antenna surface.
6. The anti-jamming radar antenna according to claim 4, characterized in that the two sides of the V-shaped cavity are symmetrically arranged two inclined planes, two symmetrical inclined planes, connecting the rectangular metal plane and the side wall of the back cavity.
7. An anti-jamming low frequency ground penetrating radar system, comprising:
an anti-interference radar antenna comprising a transmitting antenna for transmitting an ultra-wideband radar pulse signal and a receiving antenna for receiving an ultra-wideband radar echo signal, wherein the transmitting antenna and the receiving antenna are the anti-interference radar antenna according to any one of claims 1 to 6;
the large-amplitude pulse transmitter is connected to the transmitting antenna and used for generating a periodic ultra-wideband radar pulse signal, and the ultra-wideband radar pulse signal has a large-amplitude characteristic;
and the wireless synchronous receiver is connected to the receiving antenna and used for carrying out data sampling on the ultra-wideband radar echo signals received by the receiving antenna to obtain high-fidelity echo signals.
8. The tamper-resistant low frequency ground penetrating radar system of claim 7, wherein the amplitude of the ultra-wideband radar pulse signal is greater than 3000V.
9. The anti-jamming low-frequency ground penetrating radar system suitable for urban underground space exploration according to claim 7, wherein said wireless synchronization receiver comprises:
the amplitude limiting protection circuit is used for carrying out amplitude limiting on the echo signal;
the time gain circuit is connected to the amplitude limiting protection circuit and is used for carrying out variable gain amplification on the amplitude limiting signal;
the first analog-to-digital conversion circuit is connected to the time gain circuit and used for performing analog-to-digital conversion on the gained signal;
the signal buffer module is connected to the first analog-to-digital conversion circuit and used for buffering the signal processed by the first analog-to-digital conversion circuit;
the fixed gain circuit is connected to the amplitude limiting protection circuit and is used for carrying out fixed gain on the amplitude limiting signal;
the second analog-to-digital conversion circuit is connected to the fixed gain circuit and is used for performing analog-to-digital conversion on the signal after the fixed gain;
and the synchronization module is connected to the second analog-to-digital conversion circuit and used for sending the internal data according to the internally set triggering condition.
10. The system of claim 7, further comprising:
and the PC upper computer is connected with the wireless synchronous receiver through a network interface and is used for communicating with the wireless synchronous receiver to obtain echo signals uploaded by the wireless synchronous receiver, processing and analyzing the echo signals and displaying processing and analyzing results, and the PC upper computer is communicated with the wireless synchronous receiver through LAN or WiFi.
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| CN202010553404.9A CN111580094A (en) | 2020-06-17 | 2020-06-17 | Anti-interference radar antenna and anti-interference low-frequency ground penetrating radar system |
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| CN202010553404.9A CN111580094A (en) | 2020-06-17 | 2020-06-17 | Anti-interference radar antenna and anti-interference low-frequency ground penetrating radar system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670697A (en) * | 2020-12-31 | 2021-04-16 | 吉林大学 | Ground penetrating radar ultra wide band folded antenna |
| CN113328847A (en) * | 2021-06-22 | 2021-08-31 | 中国科学院地质与地球物理研究所 | Method and device for synchronizing transmitter and receiver by artificial source electromagnetic method |
-
2020
- 2020-06-17 CN CN202010553404.9A patent/CN111580094A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670697A (en) * | 2020-12-31 | 2021-04-16 | 吉林大学 | Ground penetrating radar ultra wide band folded antenna |
| CN113328847A (en) * | 2021-06-22 | 2021-08-31 | 中国科学院地质与地球物理研究所 | Method and device for synchronizing transmitter and receiver by artificial source electromagnetic method |
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