CN110534922B - Unmanned aerial vehicle ground station directional antenna array and scanning method thereof - Google Patents
Unmanned aerial vehicle ground station directional antenna array and scanning method thereof Download PDFInfo
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- CN110534922B CN110534922B CN201910622355.7A CN201910622355A CN110534922B CN 110534922 B CN110534922 B CN 110534922B CN 201910622355 A CN201910622355 A CN 201910622355A CN 110534922 B CN110534922 B CN 110534922B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000010287 polarization Effects 0.000 claims description 22
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000006854 communication Effects 0.000 description 15
- 238000004891 communication Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
- H01Q3/247—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching by switching different parts of a primary active element
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses an unmanned aerial vehicle ground station directional antenna array and a scanning method thereof, wherein a plurality of first inclined planes and second inclined planes with different elevation angles are arranged on an antenna bracket, corresponding circularly polarized antennas and four-arm coaxial linearly polarized antennas are fixed on the inclined planes, and unified control is carried out through an intervening power division network and a switching network by configuring a feed network of a vibrator. When the device is used for scanning the unmanned aerial vehicle, the high-elevation angle circumferential airspace is searched by the low gain, and then the low-elevation angle airspace of the vertical vibrator and the low-elevation angle airspace of the horizontal vibrator are searched by the high gain. The antenna array adopts an electric scanning mode, so that the scanning speed is high, and the abrasion of the equipment structure is small; the full airspace coverage is realized, and various flight attitudes of the unmanned aerial vehicle can be tolerated.
Description
Technical Field
The invention relates to the field of unmanned aerial vehicle aviation communication equipment and wireless communication, in particular to an unmanned aerial vehicle ground station directional antenna array and a scanning method thereof.
Background
With the rapid development of unmanned aerial vehicles, rapid, accurate and long-distance communication between the unmanned aerial vehicle and the ground has become a key problem of an unmanned aerial vehicle measurement and control system, which puts forward high requirements on antenna technology.
In the existing antenna technology, antennas are divided into directional antennas and omnidirectional antennas, the directivity of the directional antennas is better than that of the omnidirectional antennas, and the directional antennas are generally selected in the long-distance application of a ground tracking unmanned aerial vehicle. The directional antenna tracking scanning is conventionally performed by using a mechanical scanning mode, the scanning speed is limited by mechanical inertia, rapid scanning cannot be realized, and the directional antenna tracking scanning has a huge mechanical structure and is worn. With the development of unmanned aerial vehicle technology, unmanned aerial vehicle's flight gesture becomes more and more changeable, and what is needed is an electronically controlled scanning, multi-polarization full airspace coverage directional antenna.
Disclosure of Invention
The invention aims to: the invention aims to provide a multi-polarization unmanned aerial vehicle ground station directional antenna array based on an electric control scanning mode and a scanning method thereof, which have high scanning speed, can tolerate various flight attitudes of an unmanned aerial vehicle and realize full-airspace coverage scanning.
The technical scheme is as follows: in order to achieve the above purpose, the unmanned aerial vehicle ground station directional antenna array comprises a bracket and a plurality of antennas fixed on the bracket, wherein the cross section of the bracket is in an N-sided shape, the bracket comprises N first inclined planes and N second inclined planes, each first inclined plane is fixed with a circularly polarized antenna, and each second inclined plane is fixed with two four-arm coaxial linearly polarized antennas to form two pairs of horizontal vibrators and two pairs of vertical vibrators;
the N first radio frequency cables of the circularly polarized antenna radio frequency, the N second radio frequency cables formed by 2 XN pairs of horizontal vibrators and the N third radio frequency cables formed by 2 XN pairs of vertical vibrators are commonly connected to a control line board at the bottom of the bracket and are packaged in a1 minute 3 XN switch network; wherein n=4 to 6.
The antenna array of the present invention has a regular polygon shape, including but not limited to a regular quadrangle, a regular pentagon, and a regular hexagon. The smaller the number of N, the higher the requirement on the antenna scanning coverage area, the hexagonal frame design is the preferred scheme of the invention, and the hexagonal frame has the advantages of simple structure, low requirement on the coverage airspace of the antenna unit and capability of effectively improving the overall coverage area.
In order to realize omnibearing full circumferential scanning, for a circularly polarized antenna, the coverage elevation angle is 50-60 degrees at most, and the circularly polarized antenna is arranged on a first inclined plane, and the elevation angle of the first inclined plane is 20-45 degrees, so that the elevation angle coverage of 20-80 degrees can be realized; preferably, the elevation angle of the first inclined plane is 35 degrees, so that elevation angle coverage of 30-80 degrees is realized, and coverage of a four-arm coaxial linear polarization antenna is realized under 30 degrees. For this purpose, the four-arm coaxial linearly polarized antenna is mounted on a second inclined plane having an elevation angle of 75-90 °, preferably 80 °.
The circularly polarized antenna of the present invention includes, but is not limited to, four-arm coaxial antennas, microstrip antennas, horn antennas, and the like. The antenna element is made of metal material with oxidation-resistant surface treatment.
The four-arm coaxial linear polarization antenna provided by the invention consists of four vibrators, wherein the vibrators are connected with a base circular ring at an angle of 50 degrees, and silver-plated aluminum metal materials are used. The middle part of each vibrator is a signal port, two arms of the port are respectively connected with the inner conductor and the outer conductor of the cable, and the cable runs downwards along the bracket of the antenna unit and is connected to the power division network.
The power dividing network is a functional set for dividing one path of input signal energy into two paths or outputting equal or unequal energy in multiple paths, and can also reversely synthesize multiple paths of signal energy into one path of output. Which is arranged on the back of the bottom plate of the antenna array bracket. A pair of horizontal vibrators and a pair of vertical vibrators of each circularly polarized antenna are respectively connected with a power divider, and are connected to a switch network after being combined by a phase shifter. Two pairs of horizontal vibrators of each four-arm coaxial linear polarization antenna are connected to the same power divider and then connected to a switch network, and two pairs of vertical vibrators are connected to the other power divider and then connected to the switch network.
The switch network comprises 5 control lines, a primary switch group, a secondary switch group and a tertiary switch group; the control line of the upper two bits is connected with the first-stage switch group, the control line of the middle two bits is connected with the second-stage switch group, and the control line of the lower one bit is connected with the third-stage switch group.
For the method for scanning the aerial vehicle based on the unmanned aerial vehicle ground station directional antenna array according to claim 1, the high-elevation full-circumferential airspace scanned by N circularly polarized antennas is searched by low gain, the low-elevation airspace scanned by the four-arm coaxial linearly polarized antenna vertical oscillator is searched by high gain, and finally the low-elevation airspace scanned by the four-arm coaxial linearly polarized antenna horizontal oscillator is searched by high gain, so that all-dimensional coverage is realized.
The method for searching the aircraft has the advantages that: the 6 circularly polarized antenna units are searched for 6 times, namely, the airspace with the elevation angle of 30-80 degrees and the azimuth angle of 0-360 degrees can be scanned, and the high-low altitude flight of the aircraft can be rapidly judged. If the aircraft flies at high altitude, the search is completed; if the aircraft flies in low altitude, the horizontal polarized antenna and the vertical polarized antenna are used for searching again, so that the searching time can be saved.
The feed network adopts a 1-division 18 power division network and adopts an integrated construction mode, and the 1-division 18 power division network is manufactured in one package, so that unnecessary loss caused by an adapter can be avoided. The same CPLD chip or FPGA is used for on-off control. Each stage of the power division network adopts PIN chips which meet the power requirement and have smaller insertion loss and are suitable for being used in series, and the insertion loss of each port of the power division network is not more than 3dB.
The invention uses an electric scanning mode, the scanning speed of the antenna array is high, and the abrasion of the equipment structure is small; the multi-polarized antennas such as circular polarization, horizontal polarization, vertical polarization and the like are used, the full airspace coverage is realized, and various flight attitudes of the unmanned aerial vehicle can be tolerated. The invention relates to a low-frequency band high-gain antenna, wherein the standing wave ratio of the antenna is less than 1.3 at 750-800 Mhz, the vertical polarization horizontal polarization gain is more than 12dBi, and the circular polarization gain is more than 9dBi.
Drawings
Fig. 1 is a schematic diagram of the structure of an antenna array of the present invention;
FIG. 2 is a schematic diagram of a circularly polarized antenna power splitting network;
FIG. 3 is a schematic diagram of a linearly polarized antenna power splitting network;
FIG. 4 is a schematic diagram of a power division network connection;
Fig. 5 is a schematic diagram of the structure of a four-arm coaxial linearly polarized antenna.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the present embodiment provides an unmanned aerial vehicle ground station directional antenna array, which includes a polyhedral bracket 1, an N circularly polarized antenna 2 and 2×n four-arm coaxial linearly polarized antennas 3 mounted on the bracket. The polygonal support is made of an aluminum plate with the thickness of 4mm, and the bottom surface of the support is hollowed out so as to facilitate installation of a switch network and a connecting cable. The cross section is a positive N-sided polygon (n=4 to 6).
N first inclined planes 4 are symmetrically distributed in the center of the upper space of the polyhedral bracket 1, and each first inclined plane 4 is fixedly welded with a circularly polarized antenna 2. N second inclined planes 5 are symmetrically distributed in the center of the lower space of the polyhedral bracket 1, and each second inclined plane 5 is longitudinally welded and fixed with two four-arm coaxial linear polarization antennas 3 to form two pairs of horizontal vibrators and two pairs of vertical vibrators.
Wherein, the circularly polarized antenna can be any one of a four-arm coaxial antenna, a microstrip antenna and a horn antenna, and the antenna with circularly polarized characteristics can be used as the circularly polarized antenna
Referring to fig. 5, the four-arm coaxial linear polarized antenna is composed of four oscillators with the same shape, each oscillator is connected with a circular ring 330 of the base part at an angle of 50 degrees, a signal port 340 is arranged at the center line of each oscillator, and the root parts of the left arm and the right arm of the signal port are respectively connected with the inner conductor and the outer conductor of the radio frequency cable. The quadrifilar co-axial linearly polarized antenna is preferably silver plated aluminum metal material. The pair of vertical elements 311, 312 shown in fig. 5 are interconnected with a pair of vertical elements of another four-arm coaxial linearly polarized antenna in the same plane; the horizontal vibrators 321, 322 are also two pairs of interconnects in the same plane.
The radio frequency cable of the circularly polarized antenna and the four-arm coaxial linearly polarized antenna is connected with the power division network, the power divider and the phase shifter are connected necessarily, the same CPLD chip or FPGA is used for on-off control, and the insertion loss of each port is not more than 3dB; and then extends downwards from the inside of the bracket to the bracket bottom plate, and is packaged in a1 minute 3 XN switch network on the bracket bottom plate.
The unmanned aerial vehicle ground station directional antenna array scans the high altitude aircraft in the following modes: searching high elevation full circumferential airspace scanned by N circularly polarized antennas with low gain; and searching a low elevation space domain scanned by the vertical oscillator of the four-arm coaxial linear polarization antenna by using high gain, and searching a low elevation space domain scanned by the horizontal oscillator of the four-arm coaxial linear polarization antenna by using high gain.
Example 2
In order to control the cost, the embodiment provides an implementation mode of using the four-arm coaxial linear polarized antenna as a circular polarized antenna, but the feed network connection mode is different, so that the same antenna can meet the requirement of multiple polarizations. The maximum value of the coverage elevation angle of the four-arm coaxial linear polarization antenna is not more than 30 degrees, and a polyhedral bracket with a regular hexagon cross section is adopted for realizing 360-degree full circumferential coverage and 0-80-degree pitch angle coverage.
On the basis of the embodiment 1, the elevation angle of the first inclined plane is 35 degrees, the elevation angle of the second inclined plane is 80 degrees, and the four-arm coaxial linear polarization antenna is vertically welded on the first inclined plane and the second inclined plane.
As shown in fig. 2, when the six four-arm coaxial linear polarized antennas fixed on the first inclined plane, i.e. the circular polarized antennas 2, are connected to the power division network, a pair of horizontal vibrators and a pair of vertical vibrators of each circular polarized antenna are respectively connected to a power divider, and then are connected to the 1-division 18 switch network after being combined by a phase shifter.
As shown in fig. 3, twelve four-arm coaxial linear polarized antennas fixed on the second inclined plane, two pairs of horizontal vibrators of each four-arm coaxial linear polarized antenna are connected to the same power divider and then connected to the switching network, and two pairs of vertical vibrators are connected to the other power divider and then connected to the switching network.
Fig. 4 shows a schematic diagram of the connection of a 1-division 18 switching network comprising 5 control lines 7, a primary switching group 61, a secondary switching group 62 and a tertiary switching group 63; the control line of the upper two positions is connected with the first-stage switch group 61, the control line of the middle two positions is connected with the second-stage switch group 62, the control line of the lower one position is connected with the third-stage switch group 63, the third-stage switch group 63 is respectively connected with the radio frequency cable of the circularly polarized antenna and the power division network 20 thereof, the radio frequency cable of the four-arm coaxial linear polarized antenna (vertical vibrator) and the power division network 32 thereof, and the radio frequency cable of the four-arm coaxial linear polarized antenna (horizontal vibrator) and the power division network 34 thereof.
Scanning by using the unmanned aerial vehicle ground station directional antenna array disclosed in the above embodiment 2, and executing according to the following procedures:
S100: after the system is powered on, the antenna array receives an instruction for starting searching by the system, and the high-elevation full-circumferential airspace scanned by the 6 circularly polarized antennas is searched by low gain. If communication is established with the unmanned aerial vehicle, the process goes to S400; if communication is not established with the drone, flow S200 is entered.
S200: and searching a low elevation airspace scanned by the vertical oscillator of the four-arm coaxial linear polarization antenna with high gain. If communication is established with the unmanned aerial vehicle, the flow goes to the flow S400, and if communication is not established with the unmanned aerial vehicle, the flow goes to the flow S300.
S300: and searching a low elevation airspace scanned by the horizontal oscillator of the four-arm coaxial linear polarization antenna with high gain. If communication is established with the unmanned aerial vehicle, the flow goes to S400, if communication is not established with the unmanned aerial vehicle, the flow goes back to S100; when the 10 th step S300 scans that communication is not established with the unmanned aerial vehicle, the flow goes to S500.
S400: in the scanning process, if the ground and the unmanned aerial vehicle establish communication, the scanning is stopped immediately, and the antenna is switched to the appointed antenna immediately according to the calculation result of the relative azimuth of the ground and the airplane.
S500: stopping searching, reporting that communication information cannot be established, and waiting for the system to issue a re-searching instruction.
The steps S100, S200 and S300 are sequentially scanned according to the angles of 0-60 degrees, 60-120 degrees, 120-180 degrees, 180-240 degrees, 240-300 degrees and 300-360 degrees along the clockwise direction every 60 degrees, and the stay time of each antenna is 2 seconds.
In the above steps S100, S200, S300, if the communication terminal responds for more than 10 seconds during the communication, the search sequence is restarted from S100.
In the communication process, through the calculation result, the coverage antenna is switched in real time, so that the unmanned aerial vehicle is always covered in the range of the maximum gain antenna, and a cross coverage space of more than 1 degree is reserved in the adjacent antenna area.
As shown in table 1, table 2 and table 3, in order to realize impedance matching of the radio frequency system and meet the requirements of the ground station of the unmanned aerial vehicle on the coverage range and strength of the antenna transmitting signal, the standing wave ratio of the circularly polarized antenna is smaller than 1.3 at 750-800 Mhz, and the gain is higher than 9dBi. The standing wave ratio of the four-arm coaxial linear polarization antenna is less than 1.3 at 750-800 Mhz, and the gain is higher than 12dBi.
Table 1 list of simulation properties for circularly polarized antennas
Table 2 list of simulation performance of vertically polarized antennas
| 750MHz | 760MHz | 770MHz | 780MHz | 790MHz | 800MHz | |
| Standing wave ratio | 1.12 | 1.13 | 1.14 | 1.16 | 1.20 | 1.25 |
| Vertical polarization gain (dBi) | 12.55 | 12.58 | 12.58 | 12.55 | 12.49 | 12.40 |
| 3DB lobe width E (delay) | 35.6 | 34.9 | 34.5 | 34.0 | 33.6 | 33.1 |
| 3DB lobe width H (delay) | 50.2 | 50.4 | 50.7 | 51.0 | 51.3 | 51.6 |
Table 3 list of simulation performance of horizontally polarized antennas
Claims (9)
1. The utility model provides an unmanned aerial vehicle ground station directional antenna array, includes the support and is fixed in a plurality of antennas on the support, its characterized in that: the cross section of the bracket is in an N-sided shape, the bracket comprises N first inclined planes and N second inclined planes, a circularly polarized antenna is fixed on each first inclined plane, and two four-arm coaxial linearly polarized antennas are fixed on each second inclined plane to form two pairs of horizontal vibrators and two pairs of vertical vibrators;
N first radio frequency cables of the circularly polarized antenna, N second radio frequency cables formed by 2 XN pairs of horizontal vibrators and N third radio frequency cables formed by 2 XN pairs of vertical vibrators are commonly connected to a control line board at the bottom of the bracket and are packaged in a 1 minute 3 XN switch network; wherein n=4 to 6.
2. A unmanned aerial vehicle ground station directional antenna array according to claim 1, wherein: the elevation angle of the first inclined plane is 20-45 degrees; the elevation angle of the second inclined plane is 75-90 degrees.
3. A unmanned aerial vehicle ground station directional antenna array according to claim 2, wherein: the maximum value of coverage elevation angles of the circularly polarized antenna and the four-arm coaxial linearly polarized antenna is not more than 30 degrees, and the elevation angle of the first inclined plane is 35 degrees; the elevation angle of the second inclined plane is 80 degrees.
4. A unmanned aerial vehicle ground station directional antenna array according to claim 1, wherein: a pair of horizontal vibrators and a pair of vertical vibrators of each circularly polarized antenna are respectively connected with a power divider, and are connected to a switch network after being combined by a phase shifter.
5. A unmanned aerial vehicle ground station directional antenna array according to claim 1, wherein: two pairs of horizontal vibrators of each four-arm coaxial linear polarization antenna are connected to the same power divider and then connected to a switching network, and two pairs of vertical vibrators of each four-arm coaxial linear polarization antenna are connected to the other power divider and then connected to the switching network.
6. A drone ground station directional antenna array according to claim 3, wherein: the switch network comprises 5 control lines, a primary switch group, a secondary switch group and a tertiary switch group; the control line of the upper two bits is connected with the first-stage switch group, the control line of the middle two bits is connected with the second-stage switch group, and the control line of the lower one bit is connected with the tripolar switch group.
7. A method of searching for high altitude aircraft based on the unmanned aerial vehicle ground station directional antenna array of claim 1, characterized by: searching high elevation full circumferential airspace scanned by N circularly polarized antennas with low gain, searching low elevation airspace scanned by four-arm coaxial linearly polarized antenna vertical vibrators with high gain, and searching low elevation airspace scanned by four-arm coaxial linearly polarized antenna horizontal vibrators with high gain.
8. The method according to claim 7, wherein: the standing wave ratio of the circularly polarized antenna is smaller than 1.3 when 750-800 Mhz, and the gain is higher than 9dBi.
9. The method according to claim 7, wherein: the standing wave ratio of the four-arm coaxial linear polarization antenna is smaller than 1.3 when 750-800 Mhz, and the gain is higher than 9dBi.
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| CN201910622355.7A CN110534922B (en) | 2019-07-10 | 2019-07-10 | Unmanned aerial vehicle ground station directional antenna array and scanning method thereof |
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| CN112864602A (en) * | 2021-02-02 | 2021-05-28 | 罗森伯格技术有限公司 | Antenna for forming dual beam and hybrid antenna including the same |
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|---|---|---|---|---|
| CN1141543A (en) * | 1995-06-06 | 1997-01-29 | 环球星有限合伙人公司 | Multiple satellite repeater capacity loading with multiple spread spectrum gateway antennas |
| CN104868255A (en) * | 2015-05-05 | 2015-08-26 | 中国人民解放军总参谋部第六十研究所 | Ground multibeam electric controlled scanning measuring and controlling antenna for unmanned aerial vehicle |
| CN106464342A (en) * | 2014-02-17 | 2017-02-22 | 优必奇奥姆有限责任公司 | Broadband access system via drone/uav platforms |
| WO2018058722A1 (en) * | 2016-09-27 | 2018-04-05 | 南京肯微弗通信技术有限公司 | Dual-polarized waveguide array antenna shared by transmitting and receiving |
| CN210430124U (en) * | 2019-07-10 | 2020-04-28 | 南京迈一勤电子科技有限公司 | Directional antenna array of unmanned aerial vehicle ground station |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9853712B2 (en) * | 2014-02-17 | 2017-12-26 | Ubiqomm Llc | Broadband access system via drone/UAV platforms |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141543A (en) * | 1995-06-06 | 1997-01-29 | 环球星有限合伙人公司 | Multiple satellite repeater capacity loading with multiple spread spectrum gateway antennas |
| CN106464342A (en) * | 2014-02-17 | 2017-02-22 | 优必奇奥姆有限责任公司 | Broadband access system via drone/uav platforms |
| CN104868255A (en) * | 2015-05-05 | 2015-08-26 | 中国人民解放军总参谋部第六十研究所 | Ground multibeam electric controlled scanning measuring and controlling antenna for unmanned aerial vehicle |
| WO2018058722A1 (en) * | 2016-09-27 | 2018-04-05 | 南京肯微弗通信技术有限公司 | Dual-polarized waveguide array antenna shared by transmitting and receiving |
| CN210430124U (en) * | 2019-07-10 | 2020-04-28 | 南京迈一勤电子科技有限公司 | Directional antenna array of unmanned aerial vehicle ground station |
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