CN108599805B - Forward communication circuit based on baseband and radio frequency integrated design - Google Patents
Forward communication circuit based on baseband and radio frequency integrated design Download PDFInfo
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- CN108599805B CN108599805B CN201810738868.XA CN201810738868A CN108599805B CN 108599805 B CN108599805 B CN 108599805B CN 201810738868 A CN201810738868 A CN 201810738868A CN 108599805 B CN108599805 B CN 108599805B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
Abstract
A forward communication circuit based on baseband and radio frequency integrated design mainly comprises: the device comprises an L frequency band input module, a forward demodulation module and a 10MHz reference clock module; the L-band input module is used for filtering L-band signal stray; the forward demodulation module can directly demodulate the L-frequency band signal and convert the L-frequency band signal into a digital signal to be processed by the main processor; the 10MHz reference clock module is used for providing a reference clock for the forward demodulation module. The invention mainly solves the problems that the forward communication circuit of the existing satellite communication terminal is complex, high in failure rate and cost and the like because an L frequency band signal needs to be converted into a zero intermediate frequency signal through a down-conversion circuit and then an analog signal is converted into a digital signal through a demodulation circuit and then the digital signal is transmitted to a CPU for processing. The invention saves a down-conversion circuit, can directly demodulate and process the L-frequency band signal and convert the L-frequency band signal into a digital signal, simplifies a forward communication circuit, reduces the failure rate and the use cost, and can be used in a microwave communication system.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a forward communication circuit based on baseband and radio frequency integrated design, which can be used in a microwave communication system.
Background
In recent years, with the development of satellite communication technology, satellite communication systems have become more and more popular for people to work and live, and meanwhile, higher requirements are made on the miniaturization and cost reduction of satellite communication systems.
At present, a forward communication circuit of a satellite communication system terminal has the problems that the forward communication circuit is complex, the cost is high and the like due to the fact that after an L frequency band signal is converted into a zero intermediate frequency signal through a down-conversion circuit, an analog signal is converted into a digital signal through a demodulation circuit and the digital signal is sent to a main controller for processing. The forward communication circuit based on the baseband radio frequency integrated design can directly demodulate and process the L frequency band signal and convert the L frequency band signal into a digital signal, so that the forward communication circuit is simplified, and the failure rate and the use cost are reduced.
Disclosure of Invention
The invention aims to: aiming at the problems of complexity and high cost of a forward communication circuit of a current satellite communication system terminal, the forward communication circuit based on the baseband and radio frequency integrated design is provided, so that the forward communication circuit is simplified, and the failure rate and the use cost are reduced.
In order to achieve the above object, the present invention comprises:
a forward communication circuit based on baseband and radio frequency integrated design comprises: the device comprises an interface module, an L frequency band input module, a forward demodulation module, a reference clock module and a main controller;
the L-band signal is sent to an L-band filtering module through an interface module, the L-band filtering module filters L-band stray by adopting an L-band filtering circuit, and then the L-band signal is demodulated and converted into a digital signal through a forward demodulation module; the main controller is used for processing the demodulated digital signal so as to complete forward reception; the reference clock circuit provides a reference clock for the forward demodulation module.
And an L-band filter circuit in the L-band filter module is realized by an L-band-pass filter to filter stray outside an L band.
The forward demodulation module comprises a low-noise variable gain amplifier, an L frequency band signal converter, an anti-aliasing filter and a high-speed ADC;
the low-noise variable gain amplifier is used for amplifying the power of the L-band input signal according to the data demodulation processing requirement; the L-band signal converter is used for demodulating the L-band signal into an IQ differential signal; the anti-aliasing filter filters out clutter and amplifies the power of the IQ differential signal according to the sampling requirement of the high-speed ADC; the high-speed ADC completes sampling processing on the IQ differential signal and converts the IQ differential signal into a digital signal to be transmitted to the main controller.
The L-band signal converter supports the DVB-S2/S2X communication protocol.
The anti-aliasing filter has gain control to prevent frequency overlap during sampling.
The anti-aliasing filter filters out frequency components above the 1/2 sampling frequency.
The reference clock module provides a 10MHz reference clock for the forward demodulation module.
And the reference clock module comprises a clock circuit and a filter circuit, and the clock signal generated by the clock circuit is filtered by the filter circuit and then outputs a reference clock signal.
The clock signal generated by the clock circuit is generated by controlling the voltage-controlled crystal oscillator through the driving circuit and is sent to the filter circuit for filtering.
A satellite communication terminal comprises a forward communication circuit and a return communication circuit, wherein the forward communication circuit is realized by adopting the forward communication circuit based on the baseband and radio frequency integrated design.
The invention has the following advantages:
1) the forward communication circuit integrally designed in the baseband and the radio frequency adopts a baseband and radio frequency integrated design structure, so that the forward communication circuit is simplified. The L-band signal can be directly demodulated, processed and converted into a digital signal, and a down-conversion circuit of the forward communication circuit is simplified.
2) Compared with the prior art, the circuit structure of the invention is simple, thereby reducing the failure rate of the circuit and improving the reliability of the forward communication circuit.
3) Compared with the prior art, the circuit structure of the invention is simple, thereby reducing the use cost of users.
Drawings
FIG. 1 is a block circuit diagram of the present invention;
FIG. 2 is a circuit diagram of an L-band input module according to the present invention;
FIG. 3 is a circuit block diagram of a forward demodulation module according to the present invention;
FIG. 4 is a circuit block diagram of a 10MHz reference clock module according to the present invention.
Detailed Description
The invention discloses a forward communication circuit based on baseband and radio frequency integrated design, which mainly solves the problems that an existing forward communication circuit of a satellite communication terminal needs to convert an L frequency band signal into a zero intermediate frequency signal through a down-conversion circuit, then converts an analog signal into a digital signal through a demodulation circuit, and then transmits the digital signal to a CPU for processing, so that the forward communication circuit is complex, the failure rate is high, the cost is high, and the like. It mainly comprises: the device comprises an L frequency band input module, a forward demodulation module and a 10MHz reference clock module; the L-band input module is used for filtering L-band signal stray; the forward demodulation module can directly demodulate the L-frequency band signal and convert the L-frequency band signal into a digital signal to be processed by the main processor; the 10MHz reference clock module is used for providing a reference clock for the forward demodulation module. The invention saves a down-conversion circuit, can directly demodulate and process the L-frequency band signal and convert the L-frequency band signal into a digital signal, simplifies a forward communication circuit, reduces the failure rate and the use cost, and can be used in a microwave communication system.
The structure of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the forward communication circuit based on the baseband-radio frequency integrated design provided by the present invention mainly includes an L-band input module, a forward demodulation module, and a 10MHz reference clock module; the system also comprises an interface module and a main controller.
The L-band signal is sent to an L-band filtering module through an interface module, the L-band filtering module filters L-band stray by adopting an L-band filtering circuit, and then the L-band signal is demodulated and converted into a digital signal through a forward demodulation module; the main controller is used for processing the demodulated digital signal so as to complete forward reception; the reference clock circuit provides a reference clock for the forward demodulation module.
As shown in fig. 2, the L-band filter circuit in the L-band filter module is implemented by an L-band-pass filter to filter out the stray outside the L-band. L-band signals are input from the interface, are filtered by an L-band-pass filter to remove stray and are then processed by a forward demodulation module.
As shown in fig. 3, the forward demodulation module includes a low-noise variable gain amplifier, an L-band signal converter, an anti-aliasing filter with gain control, and a high-speed ADC. The L-band signal is amplified by a low-noise variable gain amplifier, demodulated and processed into an IQ differential signal by an L-band signal converter, frequency components higher than 1/2 sampling frequency are filtered by an anti-aliasing filter with gain control to prevent frequency overlapping during sampling, the power of the IQ differential signal is amplified according to the sampling requirement of a high-speed ADC, and finally the IQ differential signal is converted into a digital signal by the high-speed ADC to be processed by a main controller. The L-band signal converter supports the DVB-S2/S2X communication protocol.
As shown in fig. 4, the reference clock module includes a clock circuit and a filter circuit. The 10MHz clock is generated by a voltage controlled crystal oscillator controlled by a driving circuit, and provides a clock reference for the forward demodulation module after being filtered by a filter circuit.
Example (b):
the forward communication circuit based on the baseband and radio frequency integrated design can support the demodulation of the symbol rate of 500Msps, and compared with the demodulation of the 60Msps symbol rate of the conventional satellite communication terminal, the demodulation rate is improved by 800%, so that the bandwidth utilization rate and the data throughput of satellite internet service are greatly improved; meanwhile, a down-conversion circuit is omitted, so that a forward communication circuit is simplified, the fault rate is reduced, the reliability of the circuit is improved, the use cost of the forward communication circuit can be reduced by about 50% compared with that of the conventional forward communication circuit of the satellite communication terminal, and a new solution is provided for large-scale popularization and use of the satellite communication terminal.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (3)
1. A forward communication circuit based on baseband radio frequency integrated design is characterized by comprising: the device comprises an interface module, an L frequency band input module, a forward demodulation module, a reference clock module and a main controller;
the L-band signal is sent to an L-band filtering module through an interface module, the L-band filtering module filters L-band stray by adopting an L-band filtering circuit, and then the L-band signal is demodulated and converted into a digital signal through a forward demodulation module; the main controller is used for processing the demodulated digital signal so as to complete forward reception; the reference clock circuit provides a reference clock for the forward demodulation module;
the forward demodulation module comprises a low-noise variable gain amplifier, an L frequency band signal converter, an anti-aliasing filter and a high-speed ADC;
the low-noise variable gain amplifier is used for amplifying the power of the L-band input signal according to the data demodulation processing requirement; the L-band signal converter is used for demodulating the L-band signal into an IQ differential signal; the anti-aliasing filter filters out clutter and amplifies the power of the IQ differential signal according to the sampling requirement of the high-speed ADC; the high-speed ADC completes sampling processing on the IQ differential signal and converts the IQ differential signal into a digital signal to be transmitted to the main controller;
the L-band signal converter supports DVB-S2/S2X communication protocol;
anti-aliasing filter band gain control for preventing frequency overlap during sampling;
the anti-aliasing filter filters out frequency components higher than the 1/2 sampling frequency;
an L-band filter circuit in the L-band filter module is realized by an L-band-pass filter and filters stray outside an L band; the reference clock module comprises a clock circuit and a filter circuit, wherein a clock signal generated by the clock circuit is filtered by the filter circuit and then outputs a reference clock signal; the clock signal generated by the clock circuit is generated by controlling the voltage-controlled crystal oscillator by the driving circuit and is filtered by the filter circuit.
2. The forward communication circuit based on the baseband radio frequency integrated design as claimed in claim 1, wherein: the reference clock module provides a 10MHz reference clock for the forward demodulation module.
3. A satellite communication terminal, comprising a forward communication circuit and a return communication circuit, wherein the forward communication circuit is a forward communication circuit based on a baseband-radio frequency integrated design as claimed in claim 1 or 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810738868.XA CN108599805B (en) | 2018-07-06 | 2018-07-06 | Forward communication circuit based on baseband and radio frequency integrated design |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810738868.XA CN108599805B (en) | 2018-07-06 | 2018-07-06 | Forward communication circuit based on baseband and radio frequency integrated design |
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| CN108599805A CN108599805A (en) | 2018-09-28 |
| CN108599805B true CN108599805B (en) | 2020-09-18 |
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| CN113612551A (en) * | 2021-07-06 | 2021-11-05 | 河南初恒电子科技有限公司 | Automatic signal monitoring method based on L-band radio frequency direct acquisition |
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| CN101467357A (en) * | 2006-06-14 | 2009-06-24 | 英特尔公司 | Radio receiver and a method thereof |
| CN101833100A (en) * | 2010-03-29 | 2010-09-15 | 北京航空航天大学 | Method for constructing fully-digital GNSS compatible navigation receiver |
| CN101931765A (en) * | 2010-08-11 | 2010-12-29 | 无锡辐导微电子有限公司 | Broadband tuner based on band pass sigma-delta and method thereof |
| KR20160100790A (en) * | 2015-02-16 | 2016-08-24 | 삼성전자주식회사 | Method and system for automatic gain control in wireless receiver |
| CN106411425A (en) * | 2016-05-30 | 2017-02-15 | 天津中兴智联科技有限公司 | Microwave dedicated short range communication test system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1472903A (en) * | 2003-03-27 | 2004-02-04 | 东方通信科技发展有限公司 | CDMA receiver system (II) with digital AGC |
| US8305246B2 (en) * | 2009-11-05 | 2012-11-06 | Taiwan Semiconductor Manufacturing Company, Ltd. | Amplifier with digital input and digital PWM control loop |
| CN102156289B (en) * | 2011-03-09 | 2013-05-15 | 陕西诺维信息技术有限公司 | Dual-mode positioning time-service type receiver for compass satellite and global positioning system (GPS) satellite |
| CN203340076U (en) * | 2013-07-29 | 2013-12-11 | 河北神舟卫星通信股份有限公司 | High-speed satellite communication earth station |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101467357A (en) * | 2006-06-14 | 2009-06-24 | 英特尔公司 | Radio receiver and a method thereof |
| CN101833100A (en) * | 2010-03-29 | 2010-09-15 | 北京航空航天大学 | Method for constructing fully-digital GNSS compatible navigation receiver |
| CN101931765A (en) * | 2010-08-11 | 2010-12-29 | 无锡辐导微电子有限公司 | Broadband tuner based on band pass sigma-delta and method thereof |
| KR20160100790A (en) * | 2015-02-16 | 2016-08-24 | 삼성전자주식회사 | Method and system for automatic gain control in wireless receiver |
| CN106411425A (en) * | 2016-05-30 | 2017-02-15 | 天津中兴智联科技有限公司 | Microwave dedicated short range communication test system |
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