CN111613881A - Direction finding receiving device and direction finding system - Google Patents
Direction finding receiving device and direction finding system Download PDFInfo
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- CN111613881A CN111613881A CN202010567754.0A CN202010567754A CN111613881A CN 111613881 A CN111613881 A CN 111613881A CN 202010567754 A CN202010567754 A CN 202010567754A CN 111613881 A CN111613881 A CN 111613881A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/04—Details
- G01S3/043—Receivers
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
- G01S3/48—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0037—Particular feeding systems linear waveguide fed arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
- H01Q21/205—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path providing an omnidirectional coverage
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a direction-finding system and a direction-finding receiving device thereof, wherein the direction-finding receiving device comprises an antenna array and an active receiver, the antenna array comprises a plurality of biconical omnidirectional antennas, the biconical omnidirectional antennas are uniformly distributed along the circumference and define direction-finding baselines with at least two lengths, and one antenna provides a reference signal when receiving an incoming wave signal, and the other antennas provide interference signals; the active receiver is connected with the antenna array and used for sequentially gating interference signals and combining the interference signals and reference signals to output the interference signals and the reference signals to the signal processing device so that the signal processing device can calculate and determine the incoming wave direction. The invention can reduce the size of the receiving device and the weight of the receiving device to a great extent by adopting the biconical omnidirectional antenna as the array element of the antenna array, and has larger bandwidth.
Description
Technical Field
The invention relates to the technical field of radio direction finding, in particular to a direction finding receiving device and a direction finding system.
Background
The radio direction finding is that the direction of arrival of radio electromagnetic waves is received and calculated by the direction finding device according to the propagation property of the radio electromagnetic waves. Because the radio direction finding belongs to passive work and has good concealment, the radio direction finding occupies an important position in the communication field. The radio direction finder has different methods such as amplitude method direction finding, phase method direction finding, watt principle direction finding, Doppler direction finding, time difference method direction finding and correlation interferometer based on the direction finding principle.
In the direction finding of the interferometer, the incident direction of a signal is calculated by calculating the phase difference of received signals among antennas, the principle is simple and clear, the calculation amount is small, and the direction finding precision is high. When the technology is used for direction finding, the direction of one signal can be measured in all directions. The interferometer direction-finding system comprises two types of phase interferometer direction-finding and correlation interferometer direction-finding. In order to determine the incoming wave direction, the phase interferometer direction finding is required to have consistent amplitude-phase characteristics, particularly good phase consistency, so that the requirement on hardware is high, and meanwhile, direction finding blurring is easily generated in the signal direction finding at a high frequency. And the correlation interferometer direction-finding system carries out the operation of correlation algorithm on the signals in an omnibearing range, and measures the direction of the signals by obtaining the maximum value of the correlation coefficient. The direction finding of the correlation interferometer has the advantages of small operation amount, high direction finding processing speed and high precision, and the problem of the phase interferometer is solved by performing correlation operation on the phase data of the signal and the data of the sample base, so that the direction finding accuracy is greatly improved, the minimum aperture of the antenna is not required to be limited, certain wavefront distortion can be resisted, and the polarization error is not sensitive.
The direction-finding antenna system comprises an antenna array element and an active receiver: the antenna array element comprises a plurality of omnidirectional radiation units, each radiation unit is generally composed of a dipole antenna, and a circular array composed of five or eight array elements forms an interferometer antenna array; the active receiver integrates an electronic compass, a GPS positioning module and a radio frequency attenuation and phase shift switch network. The electronic compass provides a magnetic north direction, the GPS module provides a coordinate of the current antenna, and the radio frequency receiving module can perform array operation and signal processing on the received array antenna signal. The related interferometer direction finding technology is widely applied to military communication positioning, radio frequency spectrum monitoring, electronic countermeasure, national security and the like.
In the existing related interferometer direction finding technology, a dipole antenna is adopted as a direction finding antenna, and the dipole antenna has narrow bandwidth and large size; the broadband matching of the dipole antenna is poor, the standing wave is close to total reflection when the deviation from the central frequency is far, and the technology is complex in order to ensure that the signal receiving needs to adopt the integrated design of the antenna and the active amplifying circuit; the internal structure of the direction-finding antenna is large in size, and the antenna and the active circuit part use a large amount of metal materials, so that the weight is large.
Disclosure of Invention
The primary object of the present invention is to provide a direction-finding receiving device that is small in size and light in weight.
Another object of the present invention is to provide a direction-finding system using the above direction-finding receiving device.
In a first aspect, the present invention provides a direction-finding receiving apparatus, including an antenna array and an active receiver, where the antenna array includes a plurality of biconical omnidirectional antennas, the biconical omnidirectional antennas are uniformly arranged along a circumference and define direction-finding baselines with at least two lengths, and are used to provide a reference signal for one of the antennas when receiving a radar signal, and provide interference signals for the other antennas; and the active receiver is connected with the antenna array and used for receiving the reference signals and the interference signals of the antenna array and obtaining the incidence direction of the radar signals based on a correlation algorithm.
Preferably, the active receiver includes a radio frequency switch, a phase shifter and a combiner, which are connected in sequence, the biconical omnidirectional antenna for providing the reference signal is connected to one input port of the combiner, the remaining biconical omnidirectional antennas for providing the interference signal are respectively connected to the input ports of the radio frequency switch, an output port of the radio frequency switch is connected to an input port of the phase shifter, an output port of the phase shifter is connected to another input port of the combiner, and an output port of the combiner is electrically connected to the signal processing device.
Preferably, the active receiver further comprises a digitally controlled attenuator connected between the phase shifter and the combiner.
Preferably, the active receiver is provided with a plurality of mixers corresponding to the plurality of biconic omnidirectional antennas one by one, and configured to down-convert signals received by each antenna into intermediate frequency signals and output the intermediate frequency signals.
Preferably, the number of the biconical omnidirectional antennas is five, the radio frequency switch is a single-pole four-throw switch, and the phase shifter is internally provided with a phase shift switch for sequentially providing four phases of phase shift of 0 °, 90 °, 180 ° and 270 ° for the four interference signals.
Preferably, the active receiver is provided with a metal disc, a cavity is arranged in the metal disc, the radio frequency switch, the phase shifter and the combiner are all arranged in the cavity, and the five biconical omnidirectional antennas are uniformly distributed at the top end of the metal disc.
Preferably, the biconic omnidirectional antenna is fixed to the metal disc through a metal waveguide and electrically connected with a corresponding device in the metal disc.
Preferably, the output end of the combiner is connected to a power amplifier, and the power amplifier is configured to amplify the combined signal output by the combiner and provide the amplified signal to the signal processing device.
Preferably, the biconic omnidirectional antenna comprises two conical radiators arranged in an up-down opposite manner, and the two conical radiators are fed by the waveguide assembly.
As a second aspect, the present invention provides a direction-finding system, including a plurality of the above direction-finding receiving devices, which are arranged along a lane line at a preset interval.
The technical scheme provided by the invention has the beneficial effects that:
1. in the direction-finding receiving device, the biconical omnidirectional antenna is used as an array element of the antenna array, so that the volume of the direction-finding receiving device can be reduced to a great extent, the use of metal materials is reduced, and the weight of the direction-finding receiving device can be reduced. In addition, compared with the scheme that the existing direction-finding receiving device adopts a dipole antenna, the biconical antenna has larger bandwidth and can meet the requirement of the direction-finding detection of electromagnetic waves (namely radar signals) in a larger frequency range.
2. In the direction-finding receiving device, the metal disc is arranged to accommodate devices such as the radio frequency switch, the phase shifter, the combiner and the like, the antenna array mounting structure is arranged at the top end of the disc, and the waveguide is adopted to realize the communication connection and the mechanical fixation of the active receiver and the antenna array, so that the assembly of the antenna array and the active receiver is facilitated, the integral installation can be realized in the application process of the direction-finding receiving device, the installation and calibration procedures can be reduced, and the time can be saved. In addition, signal transmission is carried out through the metal waveguide, so that insertion loss can be reduced, and the accuracy of a detection result is improved.
3. The direction-finding receiving device is applied to a road network to form a direction-finding system, and can receive and find the radar signals of the vehicle through the two direction-finding receiving devices arranged at different positions on a lane line, so that the spatial position of the vehicle is obtained, and the positioning of the vehicle in the road network is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below.
Fig. 1 is a schematic structural diagram of a direction-finding receiving apparatus according to an embodiment of the present invention, illustrating an assembly relationship between an antenna array and an active receiver;
fig. 2 is a block diagram of a direction-finding receiving apparatus according to an embodiment of the present invention;
fig. 3 is a schematic usage diagram of a direction finding receiving device applied to a road network to form a direction finding system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
It will be understood that, as used herein, the term "includes" and variations thereof are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
Referring to fig. 1 and 2, as a first aspect, the present invention relates to a direction-finding receiving apparatus 1000, which is applied to a road network, and is used for receiving radar signals (e.g., electromagnetic wave signals of vehicle-mounted electronic devices) from vehicles, preprocessing the radar signals, and providing the preprocessed signals to a signal processing apparatus (not shown, the same applies below) for calculating and determining an incoming wave direction, i.e., an incident direction of the radar signals. The invention is based on the phase comparison angle measurement principle, and the incident direction of the signal is calculated by calculating the phase difference of the received signals among the antennas. Specifically, the system performs the operation of a correlation algorithm on the signal in an all-around range, and measures the incidence direction of the signal by obtaining the maximum value of the correlation coefficient.
The direction-finding receiving device 1000 includes an active receiver 200 and an antenna array 100 fixed to and electrically connected to the active receiver 200.
The active receiver 200 includes a metal disc (not shown, the same below), which has a cavity therein, and a radio frequency switch 22, a phase shifter 23, a digital attenuator 24, a combiner 25 and a power amplifier 26 which are electrically connected in sequence are disposed in the cavity (not shown, the same below).
The antenna array 100 is composed of a plurality of biconical omnidirectional antennas 11, for example, five or nine biconical omnidirectional antennas 11, which are uniformly arranged along the circumference, wherein the plurality of biconical omnidirectional antennas 11 define at least two direction-finding baselines with different lengths, one of the antennas is configured in the positive-north direction when in use, and is used as a reference antenna for providing a reference signal for a signal processing device when receiving a radar signal; and the other antennas are used as interference antennas and used for providing interference signals for the signal processing device when receiving incoming wave signals so that the signal processing device can calculate the incidence direction of the radar signals based on a correlation algorithm. Wherein the direction-finding baseline is the distance between the two antennas.
In one embodiment, the diameter of the metal disc is 60mm, five bi-conical omnidirectional antennas 11 are uniformly distributed on the top end of the metal disc, the included angle between adjacent antennas (i.e. the included angle between one antenna and two adjacent antennas) is 72 °, the five antennas define two lengths of direction-finding base lines, wherein the short base line is the distance between the two antennas which are closest to each other, and the long base line is the distance between the two antenna elements which are farthest from each other. In the present embodiment, the short base line is 30mm, and the long base line is 58 mm.
The reference antenna is electrically connected with one input port of the combiner 25, the four interference antennas are respectively connected with an input end of a single-pole four-throw radio frequency switch 22, an output end of the radio frequency switch 22 is connected with the phase shifter 23, and the phase shifter 23 is connected with the other input port of the combiner 25 through a numerical control attenuator 24, so that interference signals of the four interference antennas can be sequentially selected and combined with the reference signal, and then output to the signal processing device for calculation, analysis and determination of the incidence direction of the radar signal. Wherein the digital attenuator 24 is used to adjust the dynamic range of the direction finding receiving apparatus 1000.
The phase shifter 23 has a phase shift switch and can controllably provide phase shift amounts of four phases, namely 0 °, 90 °, 180 ° and 270 °, so that four time slots can be received for each interference signal, and the synthesis of the reference signal and the interference signal is performed in four time slots, that is, in the first time slot, the interference signal is directly (i.e., phase-shifted by 0 °) synthesized with the reference signal; in the second time slot, the phase of the interference signal is shifted by 90 degrees and is synthesized with the reference signal; in the third time slot, the phase of the interference signal is shifted by 180 degrees and is synthesized with the reference signal; in the fourth time slot, the interference signal is phase shifted 270 ° to be combined with the reference signal.
In addition, the output end of the combiner 25 is further connected to a power amplifier 26 to amplify the signal obtained by combining the reference signal and the interference signal, so as to meet the receiving requirement of the signal processing device and ensure the accuracy of the detection result.
Therefore, radar signals can be received through one antenna and serve as reference signals, signals of the other antennas serve as interference signals, the interference signals are output to a signal processing device in a gating mode and are combined with the reference signals according to four time slots respectively for processing, complex value phase vectors obtained in the measuring process are compared with a pre-stored database, the maximum relevant data are found, and the incident direction of the radar signals can be obtained.
In the above embodiment of the present invention, the biconical omnidirectional antenna 11 is used as an array element of the antenna array 100, so that the size of the antenna array 100 is reduced, the weight is reduced, and the bandwidth is expanded; in addition, by arranging the antenna array 100 on the top end of the active receiver 200, the antenna array 100 and the active receiver 200 are spatially distributed up and down, thereby reducing the horizontal size of the direction-finding receiving device 1000.
Preferably, the biconic omnidirectional antenna 11 includes two conical radiators 111 and 112 opposite to each other, and the two conical radiators 111 and 112 are fed by a waveguide assembly. By feeding with the waveguide assembly, signal loss can be reduced and, in addition, cost can be saved, as compared to coaxial cable feeding.
Further, the antenna array 100 and the active receiver 200 are connected through the metal waveguide 300, so that the assembly of the antenna array 100 and the active receiver 200 is facilitated. Specifically, the biconic omnidirectional antenna 11 of the antenna array 100 is fixed on the metal disc through the metal waveguide 300, and the biconic omnidirectional antenna 11 is electrically connected with a corresponding device in the metal disc through the metal waveguide 300, that is, the reference antenna is electrically connected with the combiner 25, and the interference antenna is electrically connected with the radio frequency switch 22. The connection between the antenna array 100 and the active receiver 200 is realized through the metal waveguide 300, so that the antenna can be supported through the metal waveguide 300, and the communication connection between the antenna and corresponding devices inside the active receiver 200 can also be completed, thereby saving the assembly steps, reducing the use of coaxial cables, saving the cost and reducing the weight.
Preferably, the active receiver 200 further includes mixers 21 corresponding to the biconic omnidirectional antennas 11 of the antenna array 100 one by one, where the mixers 21 are mixers 21 with frequency multiplication times of six, and a local oscillator signal frequency range of the mixers 21 is about 12.6GHz to 13.5GHz, and is configured to mix and down-convert five received signals to 140MHz, and then send the signals to the combiner 25 for combining. The mixer 21 connected to the reference antenna is directly connected to the combiner 25, and the mixer 21 connected to the interference antenna is connected to the rf switch 22.
As a second aspect, the present invention provides a direction-finding system including a plurality of direction-finding receiving devices 1000 and signal processing devices, which can be applied to a road network to locate a vehicle on the road network, as shown in fig. 3. Specifically, the direction finding receiving apparatus 1000 is provided at a lane line 2001 at a preset pitch, such as buried under the lane line 2001, and is configured to receive a radar signal of an on-vehicle electronic device on a vehicle traveling on the road 2000 and determine a spatial position of the vehicle. In the present embodiment, the position of the vehicle can be calculated by combining the detection results of the direction finding reception devices 1000 at two different positions. The two direction-finding receivers 1000 at different positions are two direction-finding receivers 1000 on the same lane 2001 or two direction-finding receivers 1000 on different lanes 2001.
By adopting the direction-finding receiving device 1000, the direction-finding system has the characteristics that the direction-finding receiving device 1000 is integrally installed on the lane line 2001, the installation is convenient, and the time is saved. In addition, because the biconical omnidirectional antenna 11 is used as an antenna array element of the direction-finding receiving device 1000, the bandwidth is wide, radar signals of different frequency bands can be received, and direction-finding requirements of various electronic equipment radars can be met, namely, the direction-finding system is not limited to positioning of vehicle positions in a road network.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents is encompassed without departing from the spirit of the disclosure. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (10)
1. A direction-finding receiving device is characterized by comprising an antenna array and an active receiver, wherein the antenna array comprises a plurality of biconical omnidirectional antennas, the biconical omnidirectional antennas are uniformly distributed along the circumference and define direction-finding baselines with at least two lengths, and one antenna provides a reference signal when receiving a radar signal, and the other antennas provide interference signals; the active receiver is connected with the antenna array and used for sequentially gating interference signals and combining the interference signals with reference signals to output the interference signals and the reference signals to the signal processing device so that the signal processing device can calculate and determine the incidence direction of radar signals.
2. The direction-finding receiving device of claim 1, wherein the active receiver comprises a radio frequency switch, a phase shifter and a combiner, which are connected in sequence, the biconical omnidirectional antenna for providing the reference signal is connected to one input port of the combiner, the remaining biconical omnidirectional antennas for providing the interference signal are respectively connected to the input ports of the radio frequency switch, an output port of the radio frequency switch is connected to an input port of the phase shifter, an output port of the phase shifter is connected to another input port of the combiner, and an output port of the combiner is electrically connected to the signal processing device.
3. The direction-finding receiving device of claim 2, wherein the active receiver further comprises a digitally controlled attenuator connected between the phase shifter and the combiner.
4. The direction-finding receiving device of claim 2, wherein the active receiver is provided with a plurality of mixers corresponding to the plurality of biconic omnidirectional antennas in a one-to-one manner, for down-converting signals received by the respective antennas to intermediate frequency signals for output.
5. The direction-finding receiving device of claim 2, wherein there are five biconical omnidirectional antennas, the rf switches are single-pole four-throw switches, and the phase shifter is provided with a phase shift switch for sequentially providing four phases of phase shift of 0 °, 90 °, 180 °, and 270 ° for four interference signals.
6. The direction-finding receiving device of claim 5, wherein the active receiver has a metal disc, a cavity is disposed in the metal disc, the radio frequency switch, the phase shifter and the combiner are disposed in the cavity, and the five omnidirectional biconical antennas are uniformly distributed at the top end of the metal disc.
7. The direction-finding receiving device of claim 6, wherein the biconic omnidirectional antenna is fixed to the metal disk through a metal waveguide and electrically connected to a corresponding device in the metal disk.
8. The direction-finding receiving device of claim 2, wherein a power amplifier is connected to the output end of the combiner, and the power amplifier is configured to amplify the combined signal output by the combiner and provide the amplified signal to the signal processing device.
9. The direction-finding receiving device of claim 1, wherein the biconic omnidirectional antenna comprises two conical radiators arranged in opposite directions, and the two conical radiators are fed with power through the waveguide assembly.
10. A direction-finding system comprising a plurality of direction-finding receiving devices according to any one of claims 1 to 9, the direction-finding receiving devices being arranged at predetermined intervals along a lane line.
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| CN202010567754.0A CN111613881A (en) | 2020-06-19 | 2020-06-19 | Direction finding receiving device and direction finding system |
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| CN202010567754.0A CN111613881A (en) | 2020-06-19 | 2020-06-19 | Direction finding receiving device and direction finding system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114663990A (en) * | 2020-12-22 | 2022-06-24 | 天津科畅慧通信息技术有限公司 | Intermediate frequency combining method suitable for sensitivity improvement of ETC antenna |
| CN116759786A (en) * | 2023-08-11 | 2023-09-15 | 成都华兴大地科技有限公司 | W-band omnidirectional antenna |
-
2020
- 2020-06-19 CN CN202010567754.0A patent/CN111613881A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114663990A (en) * | 2020-12-22 | 2022-06-24 | 天津科畅慧通信息技术有限公司 | Intermediate frequency combining method suitable for sensitivity improvement of ETC antenna |
| CN114663990B (en) * | 2020-12-22 | 2024-01-30 | 天津科畅慧通信息技术有限公司 | Intermediate frequency combining method suitable for improving sensitivity of ETC antenna |
| CN116759786A (en) * | 2023-08-11 | 2023-09-15 | 成都华兴大地科技有限公司 | W-band omnidirectional antenna |
| CN116759786B (en) * | 2023-08-11 | 2023-11-07 | 成都华兴大地科技有限公司 | W-band omnidirectional antenna |
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