CN104242835B - A kind of ultrashort wave radio set ALC control systems and method based on FPGA - Google Patents
A kind of ultrashort wave radio set ALC control systems and method based on FPGA Download PDFInfo
- Publication number
- CN104242835B CN104242835B CN201410477439.3A CN201410477439A CN104242835B CN 104242835 B CN104242835 B CN 104242835B CN 201410477439 A CN201410477439 A CN 201410477439A CN 104242835 B CN104242835 B CN 104242835B
- Authority
- CN
- China
- Prior art keywords
- fpga
- numerical
- alc
- voltage
- control attenuator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Transmitters (AREA)
Abstract
The present invention relates to a kind of ultrashort wave radio set ALC control systems and method based on FPGA, hair pumping signal is first fed into numerical-control attenuator, power amplification is carried out by power amplifier module, the pumping signal amplitude of oriented coupler and wave detector detection power amplifier output, this analog signal is converted into data signal by A/D converter, FPGA is sent into.FPGA is handled data using sliding window filtering algorithm, obtains pumping signal amplitude average value, i.e., positive detection magnitude of voltage.FPGA reads the corresponding ALC voltage reference values of current operating state according to current working frequency from memory, forward direction detection magnitude of voltage and ALC voltage reference values are compared, and then the attenuation of numerical-control attenuator is adjusted, pass through the attenuation of concurrent physical line traffic control numerical-control attenuator.The present invention can effectively make hair pumping signal amplitude maintain one compared with stability range, realize the steady output of hair power signal.
Description
Technical field
The present invention relates to a kind of auto level control system, more particularly to a kind of ultrashort wave radio set ALC controls based on FPGA
System and method processed.
Background technology
In the design of the power amplifier modules such as shortwave, ultrashort wave, if input range is excessive, by power amplifier
After amplification, it is possible to produce very big output signal and damage equipment.In order to solve problem above, one kind simulation ALC is realized
The automatic level control circuit of power amplifier module（Authorization Notice No.：CN202978829U）With the utility model patent of mandate, use
Analogy method realizes that power amplifier ALC controls circuit, and input is fed back to analog attenuation network by coupler circuit coupled signal
Circuit is controlled, and realizes ALC auto level controls.But the ALC underactions of this analogy method control, and change is slow
Slowly, it is not appropriate in ultrashort wave radio set in TDMA quickly networkings application environment.
Auto level control, abbreviation ALC：Automatic Level Control, its effect is, when the width of input signal
When degree is fluctuated in very large range, by controlling the attenuation of attenuator or the gain of amplifier, protect the amplitude of output signal
Hold as constant or stably in a constant scope.I.e. when output signal value is more than the reference level value of current setting,
Even if input signal increases again, output signal also remains at output corresponding with current ALC controlling values, and this makes it possible to protect
The signal that card is output to power amplifier module keeps stable, in case power is excessive and damages equipment.
Thus, design a kind of control system for the regulation power amplifier power for being capable of fast and flexible so that work as input signal power
Change very big or when changing very big on a certain frequency in certain frequency bandwidth range, output signal power is in the frequency band
Stable digital ALC control systems are still kept to seem particularly necessary in width.
The content of the invention
In view of the deficiency that prior art is present, system is controlled the invention provides a kind of ultrashort wave radio set ALC based on FPGA
System and method, carry out auto level control it is an object of the invention to the transmission power to radio station, make to be input to power amplifier module
Hair pumping signal amplitude can guarantee that output signal power keeps constant within the specific limits when changing.
To achieve the above object, the technical scheme used is the present invention：A kind of ultrashort wave radio set ALC controls based on FPGA
System processed, it is characterised in that：Including numerical-control attenuator, power amplifier module, directional coupler, wave detector, A/D converter, FPGA, deposit
Reservoir, ARM, hair pumping signal be first fed into numerical-control attenuator, by power amplifier module carry out power amplification, oriented coupler and
The pumping signal amplitude of wave detector detection power amplifier output, this pumping signal amplitude is analog signal, is simulated this by A/D converter
Signal is converted into data signal, and sends into FPGA；In order to ensure that signal acquisition is accurate, FPGA is using sliding window filtering algorithm to A/
Data after D conversions are handled, and obtain pumping signal amplitude average value, and the average value is positive detection magnitude of voltage；FPGA
The corresponding ALC voltage reference values of current operating state are read according to current working frequency, by forward direction detection magnitude of voltage and ALC electricity
Pressure a reference value is compared, and then adjusts the attenuation of numerical-control attenuator, passes through declining for concurrent physical line traffic control numerical-control attenuator
Decrement；ARM issues setting query statement to FPGA, sets the ALC magnitudes of voltage under inquiry current operating state and numerical control to decline in real time
Subtract the decay code value of device.
A kind of ultrashort wave radio set ALC control methods based on FPGA, it is characterised in that：Concretely comprise the following steps：
（1）Before system worked well, system is carried out putting power operation, i.e., by the decay code preset value of numerical-control attenuator
And ALC voltage reference values are stored in the corresponding address of memory, concrete operations are：Sent not to numerical-control attenuator by FPGA
With value change signal attenuation, FPGA calculates the corresponding magnitude of voltage of performance number, i.e. ALC voltage reference values under each frequency
AFWDini, when stable output power is in steady state value, ARM issues control instruction to FPGA, and FPGA is according to current working frequency
ALC voltage reference values AFWDini and decay code preset value ATT are stored in the corresponding address of memory；
（2）System is in normal work, and hair pumping signal is first fed to numerical-control attenuator, then enters by power amplifier module
Row power amplification is handled so that transmission power intensity increases in order to expand transmitting boundary, and directional coupler goes out to power amplifier module
The hair pumping signal come is detected, and the forward power detected detection signal is carried out after A/D conversion to FPGA；
（3）In order to ensure that signal acquisition is accurate, FPGA does the filtering algorithm of a sliding window to the data after A/D conversions
Processing, calculates average value, obtains current positive detection magnitude of voltage AFWD；
（4）FPGA reads the corresponding ALC voltage reference values of current operating state according to current working frequency from memory
AFWDini, forward direction detection magnitude of voltage and ALC voltage reference values is compared, and then adjust the attenuation of numerical-control attenuator；
（5）First determine whether working frequency, and by the positive detection magnitude of voltage and the ALC voltage references of current frequency after sampling
Value compares, and wherein voltage difference V0 is a historical experience value, and generally 0.05V, AFWD is positive detection magnitude of voltage,
AFWDini is ALC voltage reference values, is adjusted as follows according to comparative result：
If AFWD-AFWDini>=+V0, then should reduce power, the decay code preset value ATT of numerical-control attenuator plus 1,
If AFWD-AFWDini<=-V0, then should increase power, the decay code preset value ATT of numerical-control attenuator is subtracted 1,
If-V0<AFWD-AFWDini<+ V0, then do not change power, the decay code preset value of numerical-control attenuator is kept not
Become；
（6）During real-time adjustment, it can be issued by ARM to FPGA under query statement real-time query current operating state
ALC magnitudes of voltage and numerical-control attenuator decay code value, beneficial to designer to radio station putting maintenance into practice adjust；
Adjusted by above-mentioned steps, can guarantee that input hair pumping signal in wide variation, the radiofrequency signal of output is still
So maintain in constant range, so as to reach the stable purpose of radio station transmission power output.
The present invention has positive effect：（1）The present invention controls ALC systems using digital form, can accurately adjust
Pumping signal level value is sent out, with fast response time, control is flexible, control circuit simple, is easy to software real-time upgrading and online
The advantages of modification.（2）The pumping signal amplitude of power amplifier module is input to by controlling the attenuation of numerical-control attenuator to change, so that
Reach the purpose of stable output signal power.
Brief description of the drawings
Fig. 1 realizes block diagram for the system of the present invention；
Fig. 2 is ALC control method flow charts of the present invention.
Embodiment
As shown in figure 1, a kind of ultrashort wave radio set ALC control systems based on FPGA, including numerical-control attenuator, power amplifier mould
Block, directional coupler, wave detector, A/D converter, FPGA, memory and ARM.
Hair pumping signal be first fed into numerical-control attenuator, by power amplifier module carry out power amplification, oriented coupler and
The pumping signal amplitude of wave detector detection power amplifier output, this pumping signal amplitude is analog signal, is simulated this by A/D converter
Signal is converted into data signal, and sends into FPGA；In order to ensure that signal acquisition is accurate, FPGA is using sliding window filtering algorithm to A/
Data after D conversions are handled, and obtain pumping signal amplitude average value, and the average value is positive detection magnitude of voltage；FPGA
The corresponding ALC voltage reference values of current operating state are read from memory according to current working frequency, forward direction is detected into voltage
Value and ALC voltage reference values are compared, and then adjust the attenuation of numerical-control attenuator, are declined by concurrent physical line traffic control numerical control
Subtract the attenuation of device；ARM issues setting query statement to FPGA, and the ALC magnitudes of voltage under inquiry current operating state are set in real time
With the decay code value of numerical-control attenuator.
After hair pumping signal is amplified by power amplifier module, output drive signal amplitude is detected by directional coupler, turned through A/D
FPGA is sent into after parallel operation and carries out data processing, FPGA reads current operating state pair according to current working frequency from memory
The ALC voltage reference values answered, forward direction detection magnitude of voltage and ALC voltage reference values are compared, pass through concurrent physical line traffic control
The attenuation of numerical-control attenuator, it is ensured that output signal power keeps constant within the specific limits.
A/D converter is connected with FPGA by SPI interface；Memory passes through I with FPGA2C interface is connected；ARM and FPGA
Connected by asynchronous serial port；Numerical-control attenuator is connected with FPGA by concurrent physical line.
Numerical-control attenuator has 32 grades, decay stepping 0.5dB.
Numerical-control attenuator is HE751 devices, the decay for controlling hair pumping signal；Power amplifier module is PA030512120
Device, for power amplification；Directional coupler is DBTC-18-4-75LX devices, for flowing to the monitoring of radiofrequency signal and taking
Sample；Wave detector is AD8307 devices, for detecting pumping signal amplitude；A/D converter is TLV1572 devices, for by forward direction
Detection voltage analog signal is converted to data signal；FPGA is Spartan-6 XC6SLX45 devices, for controlling ALC systems；
Memory is M95512 devices, for storing ALC voltage reference values and decay code preset value；ARM is DM3730CUSUA100 devices
Part, the decay for issuing ALC magnitudes of voltage and numerical-control attenuator under query statement real-time query current operating state to FPGA
Code value.
As shown in Fig. 2 a kind of ultrashort wave radio set ALC control methods based on FPGA, are concretely comprised the following steps：
（1）Before system worked well, system is carried out putting power operation, i.e., by the decay code preset value of numerical-control attenuator
And ALC voltage reference values are stored in the corresponding address of memory, concrete operations are：Sent not to numerical-control attenuator by FPGA
With value change signal attenuation, FPGA calculates the corresponding magnitude of voltage of performance number, i.e. ALC voltage reference values under each frequency
AFWDini, when stable output power is in steady state value, ARM issues control instruction to FPGA, and FPGA is according to current working frequency
ALC voltage reference values AFWDini and decay code preset value ATT are stored in the corresponding address of memory；
（2）System is in normal work, and hair pumping signal is first fed to numerical-control attenuator, then enters by power amplifier module
Row power amplification is handled so that transmission power intensity increases in order to expand transmitting boundary, and directional coupler goes out to power amplifier module
The hair pumping signal come is detected, and the forward power detected detection signal is carried out after A/D conversion to FPGA；
（3）In order to ensure that signal acquisition is accurate, FPGA does the filtering algorithm of a sliding window to the data after A/D conversions
Processing, calculates average value, obtains current positive detection magnitude of voltage AFWD；
（4）FPGA reads the corresponding ALC voltage reference values of current operating state according to current working frequency from memory
AFWDini, forward direction detection magnitude of voltage and ALC voltage reference values is compared, and then adjust the attenuation of numerical-control attenuator；
（5）First determine whether working frequency, and by the positive detection magnitude of voltage and the ALC voltage references of current frequency after sampling
Value compares, and wherein voltage difference V0 is a historical experience value, and generally 0.05V, AFWD is positive detection magnitude of voltage,
AFWDini is ALC voltage reference values, is adjusted as follows according to comparative result：
If AFWD-AFWDini>=+V0, then should reduce power, the decay code preset value ATT of numerical-control attenuator plus 1,
If AFWD-AFWDini<=-V0, then should increase power, the decay code preset value ATT of numerical-control attenuator is subtracted 1,
If-V0<AFWD-AFWDini<+ V0, then do not change power, the decay code preset value of numerical-control attenuator is kept not
Become；
（6）During real-time adjustment, it can be issued by ARM to FPGA under query statement real-time query current operating state
ALC magnitudes of voltage and numerical-control attenuator decay code value, beneficial to designer to radio station putting maintenance into practice adjust；
Adjusted by above-mentioned steps, can guarantee that input hair pumping signal in wide variation, the radiofrequency signal of output is still
So tie up
Hold in constant range, so as to reach the stable purpose of radio station transmission power output.
The present invention can be implemented function such as：（1）It is corresponding that FPGA reads current operating state according to present operating frequency
ALC voltage reference values, forward direction detection voltage and ALC voltage reference values are compared, and then adjust the decay of numerical-control attenuator
Amount, that is, change the pumping signal amplitude for being input to power amplifier, so as to reach the purpose of stable radio station transmission power；（2）This
Invention can by ARM to FPGA issue set query statement in real time change or inquiry current operating state under ALC magnitudes of voltage and
The decay code value of numerical-control attenuator, beneficial to designer's on-line maintenance.（3）ALC systems are controlled using digital form, can be accurate
Ground regulation hair pumping signal level value, with fast response time, control is flexible, control circuit simple, is easy to software real-time upgrading
The advantages of being safeguarded with online modification.
In summary, the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；It is all based on above-mentioned
Basic ideas, do not depart from the various changes and modification done in this creation spirit and scope, should all belong to disclosed in this invention
Scope.
Claims (1)
1. a kind of ultrashort wave radio set ALC control methods based on FPGA, it is characterised in that：Including numerical-control attenuator, power amplifier module,
Directional coupler, wave detector, A/D converter, FPGA, memory, ARM, hair pumping signal are first fed into numerical-control attenuator, pass through
Power amplifier module carries out power amplification, the pumping signal amplitude of oriented coupler and wave detector detection power amplifier output, this excitation letter
Number amplitude is analog signal, this analog signal is converted into data signal by A/D converter, and send into FPGA；In order to ensure letter
Number collection is accurate, and the data after FPGA is changed using sliding window filtering algorithm to A/D are handled, and are obtained pumping signal amplitude and are put down
Average, the average value is positive detection magnitude of voltage；FPGA reads the corresponding ALC of current operating state according to current working frequency
Voltage reference value, forward direction detection magnitude of voltage and ALC voltage reference values is compared, and then adjust the decay of numerical-control attenuator
Amount, passes through the attenuation of concurrent physical line traffic control numerical-control attenuator；ARM issues setting query statement to FPGA, sets look into real time
Ask the decay code value of the ALC magnitudes of voltage and numerical-control attenuator under current operating state；Numerical-control attenuator has 32 grades, and decay stepping
0.5dB；
Implementation method is concretely comprised the following steps：
（1）Before system worked well, system is carried out putting power operation, by the decay of numerical-control attenuator code preset value and
ALC voltage reference values are stored in the corresponding address of memory, and concrete operations are：Sent by FPGA to numerical-control attenuator different
Value changes signal attenuation, and FPGA calculates the corresponding magnitude of voltage of performance number, i.e. ALC voltage reference values under each frequency
AFWDini, when stable output power is in steady state value, ARM issues control instruction to FPGA, and FPGA is according to current working frequency
ALC voltage reference values AFWDini and decay code preset value ATT are stored in the corresponding address of memory；
（2）System is in normal work, and hair pumping signal is first fed to numerical-control attenuator, is then carried out by power amplifier module
Power amplification is handled so that transmission power intensity increases in order to expand transmitting boundary, and directional coupler comes out to power amplifier module
Hair pumping signal detected, and by the forward power detected detection signal carry out A/D conversion after give FPGA；
（3）In order to ensure that signal acquisition is accurate, the data after FPGA is changed to A/D are done at the filtering algorithm of a sliding window
Reason, calculates average value, obtains current positive detection magnitude of voltage AFWD；
（4）FPGA reads the corresponding ALC voltage reference values of current operating state according to current working frequency from memory
AFWDini, forward direction detection magnitude of voltage and ALC voltage reference values is compared, and then adjust the attenuation of numerical-control attenuator；
（5）First determine whether working frequency, and by the positive detection magnitude of voltage and the ALC voltage reference values of current frequency after sampling
Compare, wherein voltage difference V0 is a historical experience value, be 0.05V, AFWD is positive detection magnitude of voltage, and AFWDini is
ALC voltage reference values, are adjusted as follows according to comparative result：
If AFWD-AFWDini>=+V0, then should reduce power, the decay code preset value ATT of numerical-control attenuator plus 1,
If AFWD-AFWDini<=-V0, then should increase power, the decay code preset value ATT of numerical-control attenuator is subtracted 1,
If-V0<AFWD-AFWDini<+ V0, then do not change power, the decay code preset value of numerical-control attenuator is kept constant；
（6）During real-time adjustment, it can be issued by ARM to FPGA under query statement real-time query current operating state
The decay code value of ALC magnitudes of voltage and numerical-control attenuator, is adjusted beneficial to designer to radio station putting maintenance into practice；
Adjusted by above-mentioned steps, can guarantee that input hair pumping signal in wide variation, the radiofrequency signal of output is still tieed up
Hold in constant range, so as to reach the stable purpose of radio station transmission power output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410477439.3A CN104242835B (en) | 2014-09-18 | 2014-09-18 | A kind of ultrashort wave radio set ALC control systems and method based on FPGA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410477439.3A CN104242835B (en) | 2014-09-18 | 2014-09-18 | A kind of ultrashort wave radio set ALC control systems and method based on FPGA |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104242835A CN104242835A (en) | 2014-12-24 |
| CN104242835B true CN104242835B (en) | 2017-08-18 |
Family
ID=52230332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410477439.3A Active CN104242835B (en) | 2014-09-18 | 2014-09-18 | A kind of ultrashort wave radio set ALC control systems and method based on FPGA |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104242835B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603168B (en) * | 2016-11-14 | 2020-09-22 | 南京熊猫电子股份有限公司 | Transmitter ALC design universal test platform and test method |
| CN106842003A (en) * | 2017-01-06 | 2017-06-13 | 郑州云海信息技术有限公司 | Hardware adjustment method and device based on level regulation and control chip |
| CN107623941A (en) * | 2017-09-29 | 2018-01-23 | 陕西烽火实业有限公司 | The output control device and method in a kind of radio station |
| CN109450400A (en) * | 2018-11-01 | 2019-03-08 | 四川九洲空管科技有限责任公司 | The wideband transmitter excitation source device and pumping signal production method of self adaptive control |
| CN110380743B (en) * | 2019-07-19 | 2021-04-06 | 同方电子科技有限公司 | High-precision short wave transmitter power ALC control method |
| CN110336624A (en) * | 2019-08-19 | 2019-10-15 | 中兵通信科技股份有限公司 | A kind of configurable digital power correction device in wide frequency communication radio station |
| CN110505174B (en) * | 2019-08-22 | 2024-07-19 | 北京聚利科技有限公司 | Modulation depth adjusting device and road side unit |
| CN111464243A (en) * | 2020-04-02 | 2020-07-28 | 上海航天测控通信研究所 | Down converter for communication simulator |
| CN112039519B (en) * | 2020-08-12 | 2022-09-20 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range high-precision power control method for ultra-wideband millimeter wave signals |
| CN114269010B (en) * | 2021-12-24 | 2024-09-03 | 南京熊猫汉达科技有限公司 | Automatic power control correction circuit and method for short-wave radio station |
| CN114415778B (en) * | 2022-01-14 | 2023-06-27 | 中国电子科技集团公司第十研究所 | ALC loop parameter automatic debugging method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202231677U (en) * | 2011-08-19 | 2012-05-23 | 中国科学院上海天文台 | Automatic gain control circuit |
| CN103401516A (en) * | 2013-07-25 | 2013-11-20 | 京信通信系统（中国）有限公司 | Radio frequency protector |
| CN204190742U (en) * | 2014-09-18 | 2015-03-04 | 天津七一二通信广播有限公司 | A kind of military ultrashort wave radio set automatic level control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110256857A1 (en) * | 2010-04-20 | 2011-10-20 | Intersil Americas Inc. | Systems and Methods for Improving Antenna Isolation Using Signal Cancellation |
-
2014
- 2014-09-18 CN CN201410477439.3A patent/CN104242835B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202231677U (en) * | 2011-08-19 | 2012-05-23 | 中国科学院上海天文台 | Automatic gain control circuit |
| CN103401516A (en) * | 2013-07-25 | 2013-11-20 | 京信通信系统（中国）有限公司 | Radio frequency protector |
| CN204190742U (en) * | 2014-09-18 | 2015-03-04 | 天津七一二通信广播有限公司 | A kind of military ultrashort wave radio set automatic level control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104242835A (en) | 2014-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104242835B (en) | A kind of ultrashort wave radio set ALC control systems and method based on FPGA | |
| CN111769819B (en) | Sampling frequency self-adaptive adjustable data acquisition method and system | |
| EP4064501A1 (en) | Improvements relating to voltage control in renewable power plants | |
| CN105611620A (en) | Method and device for adjusting power amplifier voltage | |
| CN110474691A (en) | Gain control method and device | |
| CN103414418B (en) | Current PI control system and method of direct current motor | |
| CN104836430A (en) | Voltage and current double-loop control optimization method for bidirectional converter | |
| CN103428157A (en) | Radio-frequency signal control method and device | |
| CN204190742U (en) | A kind of military ultrashort wave radio set automatic level control circuit | |
| CN107547128A (en) | The method and device of optical module light power calibration | |
| CN103248251B (en) | Automatic variable coefficient control method for inverter | |
| CN105159390A (en) | Method for maximum power point tracing of dynamic variable-step-size photovoltaic system with anti-jamming capacity | |
| CN103634890B (en) | DPD power amplifier product power calibration method and apparatus | |
| CN205265925U (en) | Digital real -time power controlling means | |
| CN103546110A (en) | Attenuation control voltage determining method, attenuation control voltage determining device and ALC (automatic level control) circuit | |
| CN1155165C (en) | Closed-loop RF powder control device and method | |
| CN206020966U (en) | A kind of dynamic adjustment sampling, the device of control accuracy | |
| CN105402087A (en) | Variable pitch switching control method for wind generator unit | |
| CN213399267U (en) | Safety monitoring device for high-voltage power distribution cabinet | |
| CN103595445A (en) | Gain control method and gain control device for demodulation signals and microcontroller | |
| CN106160762A (en) | Automatic gain control system and method for broadband receiver and broadband receiver | |
| CN205374594U (en) | Developments reactive power collection system | |
| CN205883177U (en) | Digifax combines AGC circuit | |
| CN109818366B (en) | New energy generation power hardware-in-loop simulation method and system | |
| CN106557095A (en) | A kind of base station backstage and temperature-controlled process, and temperature control system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 300462 Binhai New Area, Tianjin economic and Technological Development Zone, North Street, No. 141 Applicant after: Tianjin 712 Communications Broadcasting Limited by Share Ltd Address before: 300462 Binhai New Area, Tianjin economic and Technological Development Zone, North Street, No. 141 Applicant before: Tianjin 712 Communication Broadcast Co., Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |