CN207867037U - Satellite signal receiver and global position system - Google Patents
Satellite signal receiver and global position system Download PDFInfo
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- CN207867037U CN207867037U CN201721864677.5U CN201721864677U CN207867037U CN 207867037 U CN207867037 U CN 207867037U CN 201721864677 U CN201721864677 U CN 201721864677U CN 207867037 U CN207867037 U CN 207867037U
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Abstract
This application involves technical field of satellite more particularly to a kind of satellite signal receiver and global position systems.A kind of satellite signal receiver, it may include：Double-fed network antenna, for receiving satellite RF signal；It is mixed coupler, is connect with double-fed network antenna, for carrying out phase offset to the satellite RF signal；And radio frequency circuit board；Wherein, double-fed network antenna and the mixing coupler are integrated on the radio frequency circuit board.By the way that double-fed network antenna and mixing coupler to be integrated on radio frequency circuit board, to reduce the complexity of equipment cost and system；It is wide by the impedance bandwidth, increase antenna gain, the improvement antenna half-power wave beam that promote antenna, to provide high-precision location information；Simultaneously by reducing antenna axial ratio so that phase center is more accurate, can also keep preferable reception in mobile environment so that satellite signal receiver has stronger anti-multipath jamming performance.
Description
Technical field
This application involves technical field of satellite, more particularly to a kind of satellite signal receiver and satellite positioning system
System.
Background technology
Currently, satellite receiver generally comprises board receiver and antenna integrated board receiver without antenna.
Wherein, although the board receiver without antenna can realize decimeter grade, even Centimeter Level by external antenna
High accuracy positioning, but its antenna need to be separated from each other with board main body, so will increase system complexity and integral device at
This；And antenna integrated board receiver then generally uses single feed-in type antenna, although can become one, it cannot achieve
The high-precisions location requirement such as decimeter grade, Centimeter Level.
In addition, in mobile environment, vibration, displacement etc. can also reduce connecing for the antenna of antenna integrated board receiver
It produces effects fruit, and is vulnerable to the adverse effect of multipath interference.
Utility model content
Based on this, it is necessary to provide a kind of satellite signal receiver and global position system, energy in view of the above technical problems
It is enough that antenna is integrated in the complexity that cost and system are reduced in board main body, while high-precision positioning can be provided again, and
Preferable reception can also be kept in mobile environment, and there is stronger anti-multipath jamming performance.
A kind of satellite signal receiver, it may include：
Double-fed network antenna, for receiving satellite RF signal；
It is mixed coupler (Hybrid coupler), is connect with double-fed network antenna, for the satellite RF
Signal carries out phase offset；And
Radio frequency circuit board；
Wherein, double-fed network antenna and the mixing coupler are integrated on the radio frequency circuit board.
In an alternative embodiment, above-mentioned satellite signal receiver may also include：
GNSS (Global Navigation Satellite System, Global Navigation Satellite System) master chip, with institute
Mixing coupler connection is stated, for being handled the satellite RF signal after phase offset to obtain location information；
Wherein, the GNSS master chips are integrated on the radio frequency circuit board.
In an alternative embodiment, above-mentioned satellite signal receiver may also include：
Radio circuit is integrated on the radio frequency circuit board；
Wherein, the GNSS master chips are connect by the radio circuit with the mixing coupler, and the GNSS master
Chip and the communication leg that the communication leg that the radio circuit is constituted is after impedance matching is debugged.
In an alternative embodiment, double-fed network antenna is fixedly installed on the upper table of the radio frequency circuit board
Face, the mixing coupler, the GNSS master chips and the radio circuit are fixedly installed on the following table of the radio frequency circuit board
Face.
In an alternative embodiment, double-fed network antenna includes can generate side frequency resonance mode two
Present needle；
Wherein, two feedbacks needle closes on the center position for the physical size for being set to double-fed network antenna, and
It is connect with the mixing coupler through the radio frequency circuit board.
In an alternative embodiment, the mixing coupler has zero phase angle and minus 90 degree of phase pins；
Wherein, the zero phase angle and minus 90 degree of phase pins connect one to one with described two feedback needles respectively,
Phase difference for generate between two-way satellite RF signal that double-fed network antenna received 90 degree.
In an alternative embodiment, the radio frequency circuit board is additionally provided with radio circuit；The mixing coupler is also
With input pin and isolation pin；
Wherein, the input pin is connect by the radio circuit with the rf inputs of the GNSS master chips；Institute
It states isolation pin and passes through protective grounding.
In an alternative embodiment, above-mentioned satellite signal receiver may also include：
Outer casing upper cover has lower ending opening；
Shell lower cover has upper end opening, and the upper end opening is connect with the lower ending opening opposing seal, is used for shape
At the outer cover body with chamber resettling；
Wherein, double-fed network antenna, the mixing coupler, the GNSS master chips and the radio frequency electrical are integrated with
The radio frequency circuit board on road is fixedly installed in the chamber resettling.
In an alternative embodiment, the radio frequency circuit board is fixed on the shell lower cover by metal fixed structure
On, the outer casing upper cover covers double-fed network antenna；
Wherein, the outer casing upper cover is plastic shell, and the shell lower cover is metal shell.
In an alternative embodiment, above-mentioned satellite signal receiver may also include：
Magnet in the chamber resettling and is fixedly installed under the shell on lid.
In an alternative embodiment, double-fed network antenna includes：
Substrate；
Antenna stepped construction is set on the substrate；And
Conductive film covers the upper surface and the lower surface of the substrate.
In an alternative embodiment, the radio frequency circuit board is ceramic substrate, and the material of the conductive film is silver.
A kind of global position system, it may include：
Satellite signal receiver as described in above-mentioned any one：
Position location satellite, for emitting the satellite RF signal；
Ground control equipment, the real-time status for monitoring the position location satellite；And
Ground enhances equipment, for promoting the satellite signal receiver positioning accuracy.
Above-mentioned satellite signal receiver and global position system, can by by double-fed network antenna and mixing coupler collection
At on radio frequency circuit board, to reduce the complexity of equipment cost and system；By promoting the impedance bandwidth of antenna, increasing antenna
Gain, improvement antenna half-power wave beam are wide, to provide high-precision location information；Simultaneously by reducing antenna axial ratio so that phase
Position center is more accurate, can also keep preferable reception in mobile environment so that satellite signal receiver has
Stronger anti-multipath jamming performance.
Description of the drawings
Fig. 1 is the configuration schematic diagram of one embodiment Satellite signal receiver；
Fig. 2 is the structural schematic diagram of radio circuit back shown in Fig. 1；
Fig. 3 is the connection relationship diagram between component in satellite signal receiver；
Fig. 4 is the positive structural schematic diagram of radio frequency circuit board shown in Fig. 1；
Fig. 5 is the structural schematic diagram of shell lower cover shown in Fig. 1；
Fig. 6 is the schematic diagram of one embodiment Satellite positioning system.
Specific implementation mode
It is with reference to the accompanying drawings and embodiments, right in order to make the object, technical solution and advantage of the application be more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, and
It is not used in restriction the application.
Fig. 1 is the configuration schematic diagram of one embodiment Satellite signal receiver；Fig. 2 is radio frequency electrical shown in Fig. 1
The structural schematic diagram of road back.As shown in Fig. 1~2, a kind of satellite signal receiver, including radio frequency circuit board 2, and it is integrated
In double frequency network antenna 4 and mixing coupler 5 on the radio frequency circuit board 2.Double frequency network antenna 4, which can be used for receiving, such as to be positioned
The satellite RF signal that the equipment such as satellite are emitted increases day to improve antenna impedance bandwidth and antenna half-power beamwidth
Line gain；Mixing coupler 5 is connect with double frequency network antenna 4, the satellite RF letter that can be used for receiving double frequency network antenna 4
Number carry out phase offset processing so that double frequency network antenna 4 has specific antenna polarization characteristic, and can effectively reduce antenna axial ratio
(Axial ratio), and then promote the stability that satellite signal receiver receives signal in dynamic.
In an alternative embodiment, as shown in Figure 1, double frequency network antenna 4 may include substrate (not shown) and
The antenna stepped construction (not shown) being set on the substrate, and be printed on base lower surface and antenna stacking knot
Conductive film (not shown) in the topsheet surface of structure；The material of the conductive film can be the preferable material of electrical conductivity,
Such as the metal materials such as silver or copper, further to increase the radiation gain (Gain) of antenna.Wherein, above-mentioned substrate can be compared with
Substrate prepared by the material of low-k (as dielectric constant is less than 9), such as ceramic substrate etc., in order to compatible double frequency
The size and impedance bandwidth of network antenna 4.
In an alternative embodiment, as shown in Fig. 1~2, satellite signal receiver, which may also include, is integrated in above-mentioned penetrate
GNSS master chips 6 (such as HDBD9XX family chips) on frequency circuit plate 2, the GNSS master chips 6 connect with coupler 5 is mixed
It connects, can be used for handling the satellite RF signal after progress phase offset, to obtain satellite positioning signal.Wherein, GNSS
Master chip 6 can have such as high-precision difference enhancing positioning, support single station RTK positioning and be based on CORS (Continuously
Operating Reference Stations) functions such as continuous operation reference base station network RTK positioning, to realize small ruler
While the characteristics such as very little and low-power consumption so that satellite signal receiver has higher Interference Detection, dynamically filters out interference, in turn
It can carry out high-precision (such as Centimeter Level) navigator fix.For example, GNSS master chips 6 can be by GNSS that Allystar is developed series
Chip, and its RTK positioning accuracy, in the horizontal direction up to 2cm+1ppm, elevation is up to 5cm+1ppm.Due to double frequency network day
Line 4, mixing coupler 5 and GNSS master chips 6 are integrated on radio frequency circuit board 2, therefore can be so that satellite signal receiver has
While with high-precision (such as Centimeter Level) positioning performance, high integration integration is realized to reduce answering for equipment cost and system
Polygamy.
Fig. 3 is the connection relationship diagram between component in satellite signal receiver.As shown in Figures 1 to 3, optional at one
Embodiment in, as shown in Figures 1 to 3, radio circuit 8 can be also integrated on radio frequency circuit board 2, GNSS master chips 6 can be by this
Radio circuit 8 is connect with mixing coupler 5, i.e. double frequency network antenna 4, mixing coupler 5, radio circuit 8 and GNSS master chips 6
It is sequentially connected, satellite RF signal received by double frequency network antenna 4, after mixing coupler 5 carries out phase-shifted, through radio frequency
Circuit 8 is sent to GNSS master chips 6 and is handled, to obtain the location information of the satellite signal receiver, and the GNSS main cores
Piece 6 can also respectively with double frequency network antenna 4, be mixed in the satellite signal receivers such as coupler 5, radio circuit 8 all parts into
Row communication connection；Wherein, the communication leg that GNSS master chips 6 are constituted with radio circuit can be after impedance matching is debugged
Communication leg.For example, to carrying out impedance matching debugging, energy from GNSS master chips 6 to the branch between the output end of radio circuit
Enough effectively reduce low-noise amplifier (Low Noise Amplifier, abbreviation LNA) noise figure (Noise Figure,
Abbreviation NF) and filter (filter) Out-of-band rejection (out-band rejection) index, to promote integrated satellite letter
The signal receiving sensitivity of number receiver and block out-of-band interference performance.It in actual application, is debugged by impedance matching, energy
The noise figure for enough reducing low-noise amplifier is all smaller than 1.5dB in satellite reception frequency band so that the outer suppression of band of filter
Index processed is more than -40dB.
Fig. 4 is the positive structural schematic diagram of radio frequency circuit board shown in Fig. 1.As shown in figures 1-4, optional at another
In embodiment, radio frequency circuit board 2 has upper surface and the lower surface opposite with the upper surface, in order to by above-mentioned all parts collection
Be integrally formed, above-mentioned double frequency network antenna 4 can be attached to the upper surface of radio frequency circuit board 2, and will mixing coupler 5,
GNSS master chips 6 and radio circuit 8 etc. are fixed on the lower surface of radio frequency circuit board 2.Wherein, double frequency network antenna 4
It may include the two feedback needles (Feed in pin) 41 that can generate side frequency resonance mode (resonance mode), two feedbacks
Needle 41 can close on the center position for the physical size for being set to double-fed network antenna 4；For example, can be in the process assembled
In, then while double-fed network antenna 4 is attached to the upper surface of radio frequency circuit board 2 so that two above-mentioned feedback needles 41 run through
Radio frequency circuit board 2 is attached with coupler 5 is mixed, and after commissioning, may make pair being assemblied on radio frequency circuit board 2
Frequency network antenna 4 can promote half work(of radiation while effectively increasing antenna impedance bandwidth (Impedance Bandwidth)
Rate wave beam wide (Half power beamwidth) and antenna gain (Gain), and can be so that phase center (Phase center)
More precisely.
In addition, the data-interface 7 being connect with GNSS master chips 6 is also integrated on radio frequency circuit board 2, the data-interface 7
It may be provided at the marginal position on 2 lower surface of radio frequency circuit board, the satellite RF that double-fed network antenna 4 is received can be believed
Number fundamental frequency signal (Base band signal) is converted into after 6 calculation process of GNSS master chips, and can be by the data-interface 7
It is sent to by the connection pin such as power pins (VCC), transmitting foot position (TX), reception foot position (RX), grounding leg (GND) outer
In portion's equipment.
As shown in figures 2-3, in another optional embodiment, mixing coupler 5 can be that there are four the devices of pin for tool
Part specifically may include zero phase angle (Phase 0degree), minus 90 degree of (- 90 °) phase pins (Phase -90degree), defeated
Enter pin (Input) and isolation pin (Isolation) (being not shown in figure)；Wherein, zero phase angle and minus 90 degree of phases
Foot connects one to one with two feedback needles 41 respectively, the two-way satellite RF signal for making double-fed network antenna 4 be received
Between generate the phase difference of 90 degree (90 °), and input pin then can be defeated by the radio frequency of radio circuit 8 and GNSS master chips 6
Enter end connection, pin then protective grounding is isolated, ground resistance can be 50ohm.Two above-mentioned feedback needles 41 are so that double-fed network day
The phase difference that 90 ° are generated between the two-way satellite RF signal that line 4 is received effectively is reduced double with forming right-hand polarization characteristic
The axis ratio of network antenna 4 is presented, so that under dynamic situation, electric wave signal all has relatively steady in vertical surface or horizontal surface
Fixed signal receiving performance.
As shown in figures 1-4, in another optional embodiment, above-mentioned satellite signal receiver, which may also include, to be had
The outer casing upper cover 1 of lower ending opening and the shell lower cover 3 with upper end opening, and the outer casing upper cover 1 and shell lower cover 3 by will under
End opening corresponds to upper end opening and carries out opposing seal connection, for forming such as circular shell sheet with chamber resettling
Body；Such as can be by being threaded concaveconvex structure so that the upper end opening of the lower ending opening opposite shell lower cover 3 of outer casing upper cover 1 into
Row hook is closed, and is handled come the further leakproofness for promoting chamber resettling by internal dispensing so that satellite signal receiving
Machine can have the water-proof function of IP67 (Ingress Protection Rating) rank.
In addition, being integrated with the components such as double-fed network antenna 4, mixing coupler 5, GNSS master chips 6 and radio circuit 8
Radio frequency circuit board 2 is fixedly installed in the chamber resettling, and outer casing upper cover 1 covers double-fed network antenna 4.Wherein, outer casing upper cover 1
Plastic shell, in order to which double-fed network antenna 4 receives satellite RF signal, and shell lower cover 3 is then metal shell, and radio frequency
Circuit board 2 is fixed on by metal fixed structure on the shell lower cover 3, is such as opened through the screw on bolt radio frequency circuit board 2
Hole 21 is fixed in the hole 31 on shell lower cover 3, to enhance the ground connection performance of satellite signal receiver, is further increased
The reception for adding antenna gain, promoting receiver sensitivity, antenna axial ratio is greatly lowered, enhancing satellite RF signal, and
So that satellite signal receiver has stronger anti-multipath (multi path) jamming performance.
Fig. 5 is the structural schematic diagram of shell lower cover shown in Fig. 1.As described in figures 1 and 5, in another optional embodiment
In, above-mentioned satellite signal receiver may also include magnet, which, which can be located in chamber resettling, is fixed at shell lower cover 3
On, it can be used for satellite signal receiver being fixed on iron-containing carrying platform by way of magnetic, to move in carrying platform
When dynamic satellite signal receiver can strength be fixed on the carrying platform.For example, magnet includes being uniformly arranged on shell lower cover 3
On four blocks of magnet 9, the material of the magnet 9 may include neodymium, iron, boron etc..
Fig. 6 is the schematic diagram of one embodiment Satellite positioning system.As shown in fig. 6, a kind of global position system, can wrap
Include position location satellite 11, satellite signal receiver 12, ground control equipment 13 and ground enhancing equipment 14；Position location satellite 11 is for sending out
Penetrate satellite RF signal；Satellite signal receiver 12 can be the satellite signal receiver described in above-mentioned any embodiment, with
The satellite RF signal emitted for receiving position location satellite 11, and positioning letter can be generated according to the satellite RF signal received
Breath；Ground control equipment 13 can be used for monitoring the real-time status of position location satellite；Ground enhancing equipment 14 can be used for controlling from ground
Equipment 13 obtains located in connection data to promote the positioning accuracy of satellite signal receiver 12.
Recorded satellite signal receiver and global position system in the application, can be by by 1 He of double-fed network antenna
Mixing coupler 5 is integrated on radio frequency circuit board 2, to reduce the complexity of equipment cost and system；By the way that adjacent frequency can be generated
Two feedback needles 41 of rate resonance mode are wide come impedance bandwidth, increase antenna gain, the improvement antenna half-power wave beam for promoting antenna,
To provide high-precision location information；Simultaneously by reducing antenna axial ratio so that phase center is more accurate, in mobile ring
Preferable reception can also be kept in border so that satellite signal receiver has stronger anti-multipath jamming performance.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to claim therefore be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, under the premise of not departing from the application design, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the protection domain of the application patent should be determined by the appended claims.
Claims (13)
1. a kind of satellite signal receiver, which is characterized in that including：
Double-fed network antenna, for receiving satellite RF signal；
It is mixed coupler, is connect with double-fed network antenna, for carrying out phase offset to the satellite RF signal；And
Radio frequency circuit board；
Wherein, double-fed network antenna and the mixing coupler are integrated on the radio frequency circuit board.
2. satellite signal receiver according to claim 1, which is characterized in that further include：
GNSS master chips are connect with the mixing coupler, for the satellite RF signal after phase offset handled with
Obtain location information；
Wherein, the GNSS master chips are integrated on the radio frequency circuit board.
3. satellite signal receiver according to claim 2, which is characterized in that further include：
Radio circuit is integrated on the radio frequency circuit board；
Wherein, the GNSS master chips are connect by the radio circuit with the mixing coupler, and the GNSS master chips
It is the communication leg after impedance matching is debugged with the communication leg that the radio circuit is constituted.
4. satellite signal receiver according to claim 3, which is characterized in that double-fed network antenna is fixedly installed on
The upper surface of the radio frequency circuit board, the mixing coupler, the GNSS master chips and the radio circuit are fixedly installed on
The lower surface of the radio frequency circuit board.
5. satellite signal receiver according to claim 4, which is characterized in that double-fed network antenna includes that can generate
Two feedback needles of side frequency resonance mode；
Wherein, two feedbacks needle closes on the center position for the physical size for being set to double-fed network antenna, and runs through
The radio frequency circuit board is connect with the mixing coupler.
6. satellite signal receiver according to claim 5, which is characterized in that the mixing coupler has zero phase angle
With minus 90 degree of phase pins；
Wherein, the zero phase angle and minus 90 degree of phase pins connect one to one with described two feedback needles respectively, are used for
So that generating 90 degree of phase difference between the two-way satellite RF signal that double-fed network antenna is received.
7. satellite signal receiver according to claim 6, which is characterized in that the radio frequency circuit board is additionally provided with radio frequency
Circuit；The mixing coupler also has input pin and isolation pin；
Wherein, the input pin is connect by the radio circuit with the rf inputs of the GNSS master chips；It is described every
From pin protective grounding.
8. satellite signal receiver according to claim 3, which is characterized in that further include：
Outer casing upper cover has lower ending opening；
Shell lower cover has upper end opening, and the upper end opening is connect with the lower ending opening opposing seal, is used to form tool
There is the outer cover body of chamber resettling；
Wherein, double-fed network antenna, the mixing coupler, the GNSS master chips and the radio circuit are integrated with
The radio frequency circuit board is fixedly installed in the chamber resettling.
9. satellite signal receiver according to claim 8, which is characterized in that the radio frequency circuit board is fixed by metal
Structure is fixed under the shell on lid, and the outer casing upper cover covers double-fed network antenna；
Wherein, the outer casing upper cover is plastic shell, and the shell lower cover is metal shell.
10. satellite signal receiver according to claim 8, which is characterized in that further include：
Magnet in the chamber resettling and is fixedly installed under the shell on lid.
11. satellite signal receiver according to claim 1, which is characterized in that double-fed network antenna includes：
Substrate；
Antenna stepped construction is set on the substrate；And
Conductive film covers the upper surface and the lower surface of the substrate.
12. satellite signal receiver according to claim 11, which is characterized in that the substrate is ceramic substrate, described
The material of conductive film is silver.
13. a kind of global position system, which is characterized in that including：
Satellite signal receiver as described in any one of claim 1-12：
Position location satellite, for emitting the satellite RF signal；
Ground control equipment, the real-time status for monitoring the position location satellite；And
Ground enhances equipment, for promoting the satellite signal receiver positioning accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721864677.5U CN207867037U (en) | 2017-12-27 | 2017-12-27 | Satellite signal receiver and global position system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721864677.5U CN207867037U (en) | 2017-12-27 | 2017-12-27 | Satellite signal receiver and global position system |
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| Publication Number | Publication Date |
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| CN207867037U true CN207867037U (en) | 2018-09-14 |
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ID=63466941
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721864677.5U Active CN207867037U (en) | 2017-12-27 | 2017-12-27 | Satellite signal receiver and global position system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113678623A (en) * | 2020-05-18 | 2021-11-23 | 株式会社久保田 | Combine harvester |
| CN115015973A (en) * | 2022-08-09 | 2022-09-06 | 龙旗电子(惠州)有限公司 | GPS interference detection method, device, equipment and storage medium |
-
2017
- 2017-12-27 CN CN201721864677.5U patent/CN207867037U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113678623A (en) * | 2020-05-18 | 2021-11-23 | 株式会社久保田 | Combine harvester |
| CN115015973A (en) * | 2022-08-09 | 2022-09-06 | 龙旗电子(惠州)有限公司 | GPS interference detection method, device, equipment and storage medium |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Satellite signal receiver and satellite positioning system Effective date of registration: 20190626 Granted publication date: 20180914 Pledgee: China Minsheng Banking Corp Shenzhen branch Pledgor: Shenzhen Huada Beidou Technology Co., Ltd. Registration number: 2019440020055 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210210 Granted publication date: 20180914 Pledgee: China Minsheng Banking Corp Shenzhen branch Pledgor: ALLYSTAR TECHNOLOGY (SHENZHEN) Co.,Ltd. Registration number: 2019440020055 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| CP03 | Change of name, title or address |
Address after: 518000 room 201-2, Xinghe worldf building, No. 1 Yabao Road, Nankeng community, Bantian street, Longgang District, Shenzhen, Guangdong Patentee after: Shenzhen Huada Beidou Technology Co.,Ltd. Address before: 518172 5th floor, building 4, Yunli intelligent park, No.3, FAFA Road, Bantian street, Longgang District, Shenzhen City, Guangdong Province Patentee before: ALLYSTAR TECHNOLOGY (SHENZHEN) Co.,Ltd. |
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