CN109407130A - A kind of system and method positioned using broadcasting station - Google Patents
A kind of system and method positioned using broadcasting station Download PDFInfo
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- CN109407130A CN109407130A CN201811312233.XA CN201811312233A CN109407130A CN 109407130 A CN109407130 A CN 109407130A CN 201811312233 A CN201811312233 A CN 201811312233A CN 109407130 A CN109407130 A CN 109407130A
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- 238000000034 method Methods 0.000 title claims description 9
- 230000002708 enhancing effect Effects 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000004807 localization Effects 0.000 claims description 4
- 208000028257 Joubert syndrome with oculorenal defect Diseases 0.000 claims 1
- 230000003321 amplification Effects 0.000 abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 5
- 238000001228 spectrum Methods 0.000 abstract description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/45—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
- G01S19/46—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/18—Aspects of broadcast communication characterised by the type of broadcast system in band on channel [IBOC]
- H04H2201/183—FM digital or hybrid
Abstract
The system positioned designed by the present invention using broadcasting station, it includes broadcasting station and reception terminal, the program signal input terminal of the program signal output end connection signal combiner of broadcast singal driver, the GNSS ground of the GNSS ground enhancing data output end connection location data driver of GNSS differential data server enhances data input pin, the signal input part of the signal output end connection broadcsting transmitter of signal combiner, broadcsting transmitter is used to after broadcast program and the mixing broadcast singal of location data are carried out power amplification emit, the signal input part for receiving terminal is used to receive broadcast program and the mixing broadcast singal of location data is positioned.The present invention utilizes the infrastructure and frequency spectrum resource of existing frequency modulation broadcasting, can be while not breaking original frequency modulation broadcasting using in-band on-channel broadcast technology, and ground positioning signal and GNSS ground are broadcasted in same channel enhances signal.
Description
Technical field
The present invention relates to radio-location technology fields, in particular to a kind of system using broadcasting station positioning and side
Method.
Technical background
Beidou Navigation System is the global navigation satellite system that China develops, and has high-precision, round-the-clock, global covers
The features such as covering, is convenient, flexible, applications in various fields is unfolded rapidly.But all global position systems all suffer from one
Same problem exactly requires the positioning antenna of satellite positioning-terminal to allow for receiving 4 or more effective positioning simultaneously
Satellite-signal, however, satellite positioning antennas is difficult to meet this condition of acceptance under indoor, overpass between urban high-rise building,
It cannot achieve positioning.
The existing positioning system based on FM, CDR and digital TV broadcast signal mainly uses radio fingerprint technology,
That there are positioning accuracies is low, use cost is high, the problems such as consistent, complementary solution cannot be formed with GNSS system, difficult
With large-scale promotion application.
Summary of the invention
Present invention aim to provide a kind of system and method positioned using broadcasting station, the present invention utilizes existing
The infrastructure and frequency spectrum resource of frequency modulation broadcasting, (the broadcast program frequency band of a standard) is the same as frequency data broadcasting skill in band
Art can broadcast ground positioning signal and GNSS while not breaking original frequency modulation broadcasting program in same channel
(Global Navigation Satellite System.Global Satellite Navigation System) the ground enhancing location informations such as signal.
In order to achieve this, the system positioned designed by the present invention using broadcasting station, it includes broadcasting station and connects
Terminal is received, the broadcasting station includes broadcast singal driver, signal combiner, GNSS differential data server, location data
Driver and broadcsting transmitter, wherein the program signal output end connection signal combiner of the broadcast singal driver
Program signal input terminal, GNSS differential data server GNSS ground enhancing data output end connection location data swash
The GNSS ground enhancing data input pin of device is encouraged, the ranging code generator built in location data driver generates and broadcasting station position
Relevant ranging code is set, which forms ground location data, in location data driver
The GNSS ground enhancing data that middle ground location data and GNSS differential data server provide are combined into comprehensive positioning number
According to the location data signal that the comprehensive location data obtains after ovennodulation is passed to the location data input terminal of signal combiner
Defeated, the signal input part of the signal output end connection broadcsting transmitter of signal combiner, the signal combiner will be for that will broadcast
The program signal of Signal generator output and the location data signal of location data driver output carry out power combing, shape
At the mixing broadcast singal of broadcast program and location data, broadcsting transmitter is used for the mixing of broadcast program and location data is wide
It broadcasts after signal carries out power amplification and emits, the input terminal for receiving terminal is used to receive the mixing of broadcast program and location data
Broadcast singal, and positioned using location data.
A kind of broadcasting station localization method based on above system, it includes the following steps:
Step 1:GNSS differential data server, which sends GNSS ground to location data driver, enhances data；
Step 2: the ranging code generator built in location data driver generates ranging code relevant to broadcasting station position,
The ranging code combination broadcasting station position coordinates form ground location data, the ground location data in location data driver
The GNSS ground enhancing data provided with GNSS differential data server are combined into comprehensive location data, the comprehensive positioning
The location data signal that data obtain after ovennodulation is transmitted to the location data input terminal of signal combiner；
Step 3: the program signal that signal combiner exports broadcast singal driver and location data driver are defeated
Location data out carries out power combing, forms the mixing broadcast singal of broadcast program and location data；
Step 4: broadcsting transmitter emits after broadcast program and the mixing broadcast singal of location data are carried out power amplification；
Step 5: when receiving terminal does not have effective positioning satellite signal, frequency modulation broadcasting location data receiving module is received
The mixing broadcast singal of broadcast program and location data that the broadcasting station of 3 or more different locations issues, and by each broadcast
The location data in radio station is transferred to data processing module, and data processing module is according to the broadcasting stations of 3 or more different locations
Ground location data calculates self-position data；
When receiving terminal and receiving effective position satellite-signal, frequency modulation broadcasting location data receiving module is to data processing mould
Block exports location data, and data processing module exports GNSS ground enhancing data to satellite positioning module, satellite positioning module root
Enhance data according to ground and corresponding Positioning Satellite data calculates self-position data, and exports to data processing module.
What above-mentioned ground positioning signal referred to that the broadcasting station as known to ground (relative to aerial), position issues includes
Positioning signal including (but being not limited to) ranging code.
Location data includes but is not limited to GNSS ground enhancing data (such as CORS data) and ground location data.Ground
Base enhances data, ground location data and location data becomes radio-frequency carrier signal after handling, modulating, and is referred to as herein
Ground enhances signal, ground positioning signal and positioning signal.
The present invention utilizes the infrastructure and frequency spectrum resource of existing frequency modulation broadcasting, using in-band on-channel data broadcasting skill
Art broadcasts positioning signal while can not breaking original frequency modulation broadcasting in existing 400KHz frequency band in same channel,
I.e. ground positioning signal and satellite positioning ground enhance signal.The method is equally applicable to 500KHz frequency modulation broadcasting frequency band.
The present invention makes full use of the existing resources such as existing tuned radio frequency, transmitting equipment, transmitting station facility, not only pole
It is unrestricted greatly to reduce satellite positioning ground enhancing data distribution cost, number of users, realizes that Beidou Asia meter Ding Wei is public
Free service, it is often more important that satellite positioning (GNSS) and the positioning of broadcasting station ground are organically combined, complete skill side is formed
Case solves the problems, such as the blind spot that satellite-signal is located under the environment such as city, interior, greatly improves the available of wireless location technology
Property.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment 1；
Fig. 2 is the structural schematic diagram of embodiment 2；
Fig. 3 is the positioning schematic of scheme shown in embodiment 1.
Wherein, 1-broadcast singal driver, 2-signal combiners, 3-GNSS differential data servers, 4-positioning numbers
At driver, 5-broadcsting transmitters, 6-frequency modulation broadcasting location data receiving modules, 7-satellite positioning modules, 8-data
Manage module, 9-displays.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Embodiment 1, as shown in Figure 1, it includes broadcasting station and receives terminal, the broadcasting station includes that broadcast singal swashs
Encourage device (frequency modulation broadcasting) 1, signal combiner 2, GNSS differential data server 3, location data driver 4 and broadcsting transmitter
(frequency modulation broadcasting) 5, wherein the broadcast of the program signal output end connection signal combiner 2 of the broadcast singal driver 1
The GNSS ground enhancing data output end of programme signal input terminal, GNSS differential data server 3 connects location data driver 4
GNSS ground enhance data input pin, ranging code generator built in location data driver 4 generates and broadcasting station position
(different station channels sets different codes to relevant ranging code, these codes are mixed with specific mode with pseudo noise code
After form ranging code, principle is identical as the ranging code of satellite positioning), which (is known
Parameter), ground location data is formed, ground location data is mentioned with GNSS differential data server 3 in location data driver 4
The GNSS ground enhancing data of confession are combined into comprehensive location data, and the location data signal obtained after ovennodulation is to signal
(i.e. the signal output end connection signal combiner 2 of location data driver 4 is determined for the location data input terminal transmission of combiner 2
Position signal input part), the signal input part of the signal output end connection broadcsting transmitter 5 of signal combiner 2, the signal combining
Device 2 is used to carry out the program signal that broadcast singal driver 1 exports and the positioning signal that location data driver 4 exports
Power combing, forms the mixing broadcast singal of broadcast program and location data, and broadcsting transmitter 5 is used for broadcast program and positioning
The mixing broadcast singal of data emits after carrying out power amplification, and the input terminal for receiving terminal is for receiving broadcast program and determining
The mixing broadcast singal of position data, and positioned and (demodulated by frequency modulation broadcasting location data receiving module using location data
Comprehensive location data is isolated, passes through calculation processing in conjunction with Positioning Satellite data, realizes positioning).
In embodiment 1, the broadcasting station has 3 or more, and each broadcasting station is located at different positions, the reception
Terminal includes frequency modulation broadcasting location data receiving module 6 and data processing module 8, frequency modulation broadcasting location data receiving module 6
Location data output end connects the location data input terminal of data processing module 8, the frequency modulation broadcasting location data receiving module 6
For receiving the mixing broadcast singal of the broadcasting station broadcast program issued and location data of 3 or more different locations, and will
Each broadcast program and ranging code relevant with broadcasting station position in the mixing broadcast singal of location data to data at
Module 8 is managed, data processing module 8 calculates self-position data according to the ranging code in the broadcasting station of 3 or more different locations.
The reception terminal positioning principle of embodiment 1 are as follows:
It is known that coordinate is respectively (x1, y1), (x2, y2) and (x3, y3), setting is mobile eventually for the position of broadcasting station A, B, C
The position for holding X (i.e. reception terminal) is (xn, yn), and broadcasting station A, B, C are respectively d1, d2, d3 at a distance from mobile terminal X；
The electronic signal clock of broadcasting station A, B, C and mobile terminal X are same with Beidou (BD) or GPS high precision clock
Step；
Referring to the spectrum arrangement of CDR (Convergengt Digital Radio, Chinese Digital broadcast) standard, 2 are used
Complete half subband (such as: DA1 (L), DA4 (U)) positions relevant data information (such as: station location, radio station volume for sending
Number, pilot tone, pseudo-random binary code (ranging code), GNSS ground enhancing data etc.)；Terminal X realizes positioning using station information,
It is required to receive 3 or more radio signals, wherein at least 2 radio signals are for calculating pseudorange, at least one radio station letter
Number for correcting error.Radio station quantity is more, is conducive to improve locating speed and precision.
As shown in figure 3, the pseudorange between mobile terminal X and broadcasting station A, B, C is respectively d1, d2, d3, sat using position
Target accounting equation is (equation one):
(d1)2=(x1-xn)2+(y1-yn)2
(d2)2=(x2-xn)2+(y2-yn)2
(d3)2=(x3-xn)2+(y3-yn)2
Under clock synchronous condition, the moment radio station t0 issue distance measuring signal incoming terminal X at the time of respectively t1,
T2, t3, terminal calculate its transmission time and are respectively as follows:
△ t1=t1-t0
△ t2=t2-t0
△ t3=t3-t0
The calculation method of above-mentioned distance measuring signal transmission time is general, and the mature application in satellite positioning product, because
This is considered as can calculated data.The aerial spread speed C of electromagnetic signal is constant, it is possible thereby to pass through distance measuring signal
Transmission time calculates transmission range:
D1=△ t1*C
D2=△ t2*C
D3=△ t3*C
This expression formula is substituted into equation one, xn, yn can be calculated, error correction can be carried out using redundancy parameter.Its
In, it is open, general using the principle that redundancy parameter carries out error correction, such as measured in GNSS positioning using 4 satellites
X, y, z three-dimensional coordinate.
Above-mentioned broadcast singal driver 1, signal combiner 2, GNSS differential data server 3, location data driver 4,
Broadcsting transmitter 5, frequency modulation broadcasting location data receiving module 6, satellite positioning module 7, data processing module 8, display 9 are
Existing conventional equipment.In the present embodiment, model RVR PTX_LCD of the selection of broadcast singal driver 1, signal combiner 2 are selected
The model XRXY-S-181B of the selection of model XRXY-FMHL-100, GNSS differential data server 3, location data swash
Encourage the model XRXY-RTP-D18 of the selection of device 4, the model TF520-10KW that broadcsting transmitter 5 is selected, frequency modulation broadcasting positioning
The model XRXY-FMDR-180 of the selection of data reception module 6, the model MX-909A of the selection of satellite positioning module 7, data
The model NXP LPC1766 that processing module 8 is selected
In embodiment 1, the reception terminal further includes display 9, and the self-position data of the data processing module 8 are defeated
The self-position data input pin of outlet connection display 9.
In embodiment 1, ground location data and GNSS differential data server 3 are provided in location data driver 4
GNSS ground enhancing data are combined the (location data after combination using time division multiplexing, frequency division multiplexing or code division multiplexing mode
The data of existing secondary satellite positioning, and have when losing satellite-signal, support terminal to carry out autonomous positioning by radio station
Required data), by including orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency Division
Multiplexing the positioning signal obtained after the signal processing and modulation including).
In embodiment 1, the GNSS ground enhancing data are CORS (Continuously Operating Reference
Stations, continuous operation of the reference station system) error correction data.CORS error correction data are improved for assisted GNSS equipment
Locating speed and precision.
Embodiment 2, as shown in Fig. 2, embodiment 2 is substantially the same manner as Example 1, difference is, receiving terminal includes frequency modulation
Broadcasting location data receiving module 6, satellite positioning module 7 and data processing module 8, the frequency modulation broadcasting location data receive mould
The data input pin of the output end connection data processing module 8 of block 6, the data-interface of satellite positioning module 7 connect data processing
The data-interface of module 8, the ground that the data processing module 8 transmits frequency modulation broadcasting location data receiving module 6 enhance number
According to satellite positioning module 7 is sent to, satellite positioning module 7 calculates self-position data in conjunction with Positioning Satellite data, and will be certainly
Body position data is transferred to display 9 by data processing module 8 and is shown.Embodiment 2 is adapted to satellite positioning signal
Situation receives terminal at this time and only needs to receive the GNSS ground enhancing data that a broadcasting station issues, positioning can be realized.
A kind of broadcasting station localization method based on above system, it includes the following steps:
Step 1:GNSS differential data server 3, which sends GNSS ground to location data driver 4, enhances data；
Step 2: the ranging code generator built in location data driver 4 generates ranging relevant to broadcasting station position
Code, the ranging code combination broadcasting station position coordinates form ground location data, and ground positions in location data driver 4
The GNSS ground enhancing data that data and GNSS differential data server 3 provide are combined into comprehensive location data, through toning
The location data signal obtained after system is transmitted to the location data input terminal of signal combiner 2；
Step 3: the program signal and location data driver 4 that signal combiner 2 exports broadcast singal driver 1
The location data signal of output carries out power combing, forms the mixing broadcast singal of broadcast program and location data；
Step 4: broadcsting transmitter 5 is sent out after broadcast program and the mixing broadcast singal of location data are carried out power amplification
It penetrates；
Step 5: when receiving terminal does not have effective positioning satellite signal, frequency modulation broadcasting location data receiving module 6 is connect
The mixing broadcast singal of the broadcasting station broadcast program issued and location data of 3 or more different locations is received, and will be each wide
The location data for broadcasting radio station is transferred to data processing module 8, and data processing module 8 is electric according to the broadcast of 3 or more different locations
The ground location data of platform calculates self-position data；
When receiving terminal and receiving effective position satellite-signal, frequency modulation broadcasting location data receiving module 6 is to data processing
Module 8 exports location data, and data processing module 8 wherein effective GNSS ground enhancing data will be sent to satellite positioning module
7, satellite positioning module 7 calculates self-position in conjunction with Positioning Satellite data, and exports to data processing module 8；
Step 6: display 9 receives the self-position data that data processing module 8 is sent and is shown.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of system positioned using broadcasting station, it is characterised in that: it includes broadcasting station and reception terminal, the broadcast
Radio station includes broadcast singal driver (1), signal combiner (2), GNSS differential data server (3), location data driver
(4) and broadcsting transmitter (5), wherein the program signal output end connection signal of the broadcast singal driver (1) is combined
The GNSS ground enhancing data output end connection of the program signal input terminal of device (2), GNSS differential data server (3) is fixed
The GNSS ground of position data driver (4) enhances data input pin, and the ranging code generator built in location data driver (4) produces
Raw ranging code relevant to broadcasting station position, the ranging code combination broadcasting station position coordinates form ground location data,
The GNSS ground that ground location data and GNSS differential data server (3) provide in location data driver (4) enhances data
It is combined into comprehensive location data, the positioning signal which obtains after ovennodulation is to signal combiner
(2) location data input terminal transmission, the signal input of signal output end connection broadcsting transmitter (5) of signal combiner (2)
End, the program signal and location data driver that the signal combiner (2) is used to export broadcast singal driver (1)
(4) positioning signal exported carries out power combing, forms the mixing broadcast singal of broadcast program and location data, broadcsting transmitter
(5) for emitting the mixing broadcast singal of broadcast program and location data, the input terminal for receiving terminal is for connecing
The mixing broadcast singal of broadcast program and location data is received, and is positioned using location data.
2. the system according to claim 1 positioned using broadcasting station, it is characterised in that: the broadcasting station has 3
More than, and each broadcasting station is located at different positions, the reception terminal includes frequency modulation broadcasting location data receiving module (6)
Data processing module is connected with the location data output end of data processing module (8), frequency modulation broadcasting location data receiving module (6)
(8) location data input terminal, the frequency modulation broadcasting location data receiving module (6) is for receiving 3 or more different locations
The mixing broadcast singal of broadcast program and location data that broadcasting station issues, and by the mixed of each broadcast program and location data
It closes and is transferred to data processing module (8) in broadcast singal with broadcasting station position located in connection data, data processing module (8) root
Self-position data are calculated according to the location data in the broadcasting station of 3 or more different locations.
3. the system according to claim 1 positioned using broadcasting station, it is characterised in that: receiving terminal includes that frequency modulation is wide
Location data receiving module (6), satellite positioning module (7) and data processing module (8) are broadcast, the frequency modulation broadcasting location data connects
The data input pin of output end connection data processing module (8) of module (6) is received, the data-interface of satellite positioning module (7) connects
Connect the data-interface of data processing module (8), the data processing module (8) is by frequency modulation broadcasting location data receiving module (6)
The ground enhancing data of transmission are sent to satellite positioning module (7), and satellite positioning module (7) is calculated in conjunction with Positioning Satellite data
Self-position data, and self-position data are transferred to data processing module (8).
4. the system according to claim 2 or 3 positioned using broadcasting station, it is characterised in that: the reception terminal is also
Including display (9), the self-position of self-position data output end connection display (9) of the data processing module (8)
Data input pin.
5. the system according to claim 1 positioned using broadcasting station, it is characterised in that: in location data driver
(4) ground location data is combined with the GNSS ground enhancing data that GNSS differential data server (3) provides in, by including just
Frequency division multiplexing is handed over to be modulated at the positioning signal obtained after interior processing and modulation.
6. the system according to claim 1 positioned using broadcasting station, it is characterised in that: the GNSS ground enhances number
According to including CORS error correction data.
7. the system according to claim 1 positioned using broadcasting station, it is characterised in that: in location data driver
(4) the GNSS ground enhancing data that ground location data and GNSS differential data server (3) provide in are using time division multiplexing, frequency
Multiplexing or code division multiplexing mode is divided to be combined.
8. a kind of broadcasting station localization method based on system described in claim 1, which is characterized in that it includes the following steps:
Step 1:GNSS differential data server (3), which sends GNSS ground to location data driver (4), enhances data；
Step 2: the ranging code generator built in location data driver (4) generates ranging code relevant to broadcasting station position,
The ranging code combination broadcasting station position coordinates form ground location data, and ground positions number in location data driver (4)
It is combined into comprehensive location data according to the GNSS ground enhancing data provided with GNSS differential data server (3), through toning
The location data signal obtained after system is transmitted to the location data input terminal of signal combiner (2)；
Step 3: the program signal and location data driver that signal combiner (2) exports broadcast singal driver (1)
(4) location data signal exported carries out power combing, forms the mixing broadcast singal of broadcast program and location data；
Step 4: broadcsting transmitter (5) emits the mixing broadcast singal of broadcast program and location data；
Step 5: when receiving terminal does not have effective positioning satellite signal, frequency modulation broadcasting location data receiving module (6) receives 3
The mixing broadcast singal of broadcast program and location data that the broadcasting station of a above different location issues, and each broadcast is electric
The location data of platform position is transferred to data processing module (8), and data processing module (8) is wide according to 3 or more different locations
The ground location data for broadcasting radio station calculates self-position data；
When receiving terminal and receiving effective position satellite-signal, frequency modulation broadcasting location data receiving module (6) is to data processing mould
Block (8) exports location data, and data processing module (8) wherein effective GNSS ground enhancing data will be sent to satellite positioning mould
Block (7), satellite positioning module (7) combines Positioning Satellite data to calculate self-position, and exports and give data processing module (8)；
Step 6: display (9) receives the self-position data that data processing module (8) are sent and is shown.
9. broadcasting station localization method according to claim 8, it is characterised in that: further include step 6 after step 5: display
Device (9) receives terminal self-position data and is shown.
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| CN201811312233.XA CN109407130A (en) | 2018-11-06 | 2018-11-06 | A kind of system and method positioned using broadcasting station |
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| CN201811312233.XA CN109407130A (en) | 2018-11-06 | 2018-11-06 | A kind of system and method positioned using broadcasting station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110072187A (en) * | 2019-04-19 | 2019-07-30 | 深圳思凯微电子有限公司 | Distribution, method of reseptance and the device of differential data |
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