CN103675765A - High-frequency software radio receiving system - Google Patents
High-frequency software radio receiving system Download PDFInfo
- Publication number
- CN103675765A CN103675765A CN201310639341.9A CN201310639341A CN103675765A CN 103675765 A CN103675765 A CN 103675765A CN 201310639341 A CN201310639341 A CN 201310639341A CN 103675765 A CN103675765 A CN 103675765A
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- circuit
- receiving system
- software radio
- high frequency
- frequency
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
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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
- H04B1/06—Receivers
- H04B1/16—Circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The invention relates to a high-frequency software radio receiving system which comprises a receiving antenna, a filter circuit, a low-noise amplification circuit, an automatic gain control circuit, an A/D (analog to digital) conversion unit, an A/D sampling unit and two SMA connectors. The high-frequency software radio receiving system is characterized in that the receiving antenna used for receiving short waves in DC-30MHz frequency band is connected with the A/D conversion unit, one SMA connector is connected with the A/D conversion unit, the receiving antenna and the filter circuit, the other SMA connector is also connected with the filter circuit and externally connected with a clock source, the filter circuit, the low-noise amplification circuit, the automatic gain control circuit and the A/D sampling unit are connected serially and sequentially, and the high-frequency software radio receiving system is further inserted with an EEPROM (electrically erasable programmable read-only memory) circuit. The receiving system can directly receive broadband radio frequency signals and convert the same into intermediate frequency signals, and further can directly enter an analog to digital conversion module to perform a series of processing such as sampling. The receiving system has the advantages of compact circuit structure and low cost, and is extremely suitable for setting up small radar systems.
Description
Technical field
The present invention relates to a kind of high frequency common software technical field of radio, relate in particular to a kind of high frequency software radio receiving system.
Background technology
High frequency software radio receiving system is the radio-frequency receiving system of a kind of 6MHz-30MHz of working in.It relates to the theoretical application with technology, low noise amplifier circuit design, low-pass filter circuit of ultra-wideband antenna, also has the multiple technologies means such as access of eeprom chip.The modal application form of high frequency software radio receiving system is to build software radio system, it generally uses as the radio-frequency front-end of high frequency common software radio system, its effect is that the signal receiving is down-converted to base band to realize the conversion between analog radio-frequency signal and analog if signal, thereby speed, precision of having solved A/D and D/A etc. cannot reach the problem that radio frequency analog signal is directly sampled, and it can receive the electromagnetic wave signal (wavelength 50-10m) of 6-30MHz.The circuit of current this design generally comprises mixing unit etc., this makes circuit totally comparatively huge and complicated, has limited the frequency that receives signal, and the processing speed of its signal and efficiency are also very low, maintenance application cost is also higher, cannot be applied to the miniradar construction of maneuverability.
Summary of the invention
The object of the present invention is to provide a kind of high frequency software radio receiving system, it has circuit structure compactness, conversion speed is fast and the feature of applied range.
The present invention is achieved like this, it comprises receiving antenna, filtering circuit, low-noise amplification circuit, automatic gain control circuit, A/D converting unit, A/D sampling unit and 2 SMA connectors, it is characterized in that, for receiving the receiving antenna of the shortwave of DC-30MHz frequency range, connect A/D converting unit, a SMA connector connects respectively A/D converting unit, receiving antenna and filtering circuit, another SMA connector also connects filtering circuit, and external clock source, filtering circuit, low-noise amplification circuit, automatic gain control circuit and A/D sampling unit are contacted successively, high frequency software radio system has also inserted an eeprom circuit,
Described low-noise amplification circuit comprises that 2 video algorithms amplifiers form difference channel;
2 described SMA connectors are external up/down tuner or signal generator also;
In described eeprom circuit, store the data with the daughter board of high frequency software radio receiving system with correlativity.
Technique effect of the present invention is: software radio system 30MHz of the present invention receives daughter board and uses as software radio radio-frequency (RF) front-end circuit, can receive the radiofrequency signal of 0-30MHz, and the signal receiving is down-converted to base band to realize the conversion between analog radio-frequency signal and analog if signal, thereby the speed, precision etc. that solve A/D and D/A cannot reach the problem that radio frequency analog signal is directly sampled.Receiving system of the present invention has and can directly receive broadband radiofrequency signal and be translated into intermediate-freuqncy signal, and then can directly enter analog-to-digital conversion module a series of processing such as sample.Receiving system of the present invention has circuit structure compactness, feature that cost is low, is applicable to very much building miniradar system.
Accompanying drawing explanation
Fig. 1 is: radio frequency reception daughter board theory diagram.
Fig. 2 is: low-pass filter circuit schematic diagram.
Fig. 3 is: low-noise amplification circuit schematic diagram.
Fig. 4 is: eeprom circuit.
Embodiment
The present invention is achieved like this, and as shown in Figure 1, it comprises that it comprises receiving antenna, filtering circuit, low-noise amplification circuit, automatic gain control circuit, A/D converting unit, A/D sampling unit and 2 SMA connectors; Receiving antenna connects A/D converting unit, a SMA connector connects respectively A/D converting unit, receiving antenna and filtering circuit, another SMA connector also connects filtering circuit, and external clock source, filtering circuit, low-noise amplification circuit, automatic gain control circuit and A/D sampling unit are contacted successively, and high frequency software radio system has also inserted an eeprom circuit;
Receiving antenna: the design of this system receiving antenna can receive the shortwave of DC-30MHz frequency range;
Filtering circuit: this main circuit will adopt low-pass filter circuit, not only can be used for our unwanted clutter of filtering, also can be used for anti-sawtooth simultaneously;
Low-noise amplification circuit: be positioned at and amplify link input end, for given gain requirement, introduces as far as possible little internal noise, and the amplifier designing in the signal to noise ratio (S/N ratio) of output terminal acquisition maximum possible.The present invention adopts 2 video algorithms amplifiers to form difference channel, to realize the low noise enlarging function of circuit;
Automatic gain control circuit: in radio communication,, the damping capacity of the variation of communication distance, Electromagnetic Wave Propagation channel changes and receiver environmental change etc., the signal intensity that receiver receives all very large fluctuation can occur because receiving the difference in radio station.It is contemplated that, if the gain of receiver is constant, when input signal amplitude in very large range changes, also will there is the variation of same ratio in the amplitude of output signal, when strong signal, with regard to likely making receiver overload, cause blocking, when weak signal, likely cause again the loss of signal.In order to overcome this shortcoming, can adopt automatic gain control circuit, the gain of receiver is changed along with the power of input signal, when input signal is weak, receiver gain raises; When input signal is strong, receiver gain reduces, and with the impact of compensated input signal power, reaches and reduces the object that output level changes;
Eeprom circuit: each daughter board has a plate to carry the EEPROM of I2C (24LC024 or 24LC025) to make system can identify daughter board.This makes the host software can be according to the suitable system of installed daughter board Lookup protocol.EEPROM also can preserve some calibration values such as direct current biasing or IQ imbalance.If this EEPROM is not programmed, during running software on each pc, can print an alert message;
High frequency software radio receiving system has 2 SMA connectors, can be used for connecting outside up/down tuner or signal generator.We can regard it as entrance or the outlet of signal, and can not affect signal;
High frequency software radio receiving system of the present invention, mainly to receive based on high-frequency signal, be applicable to the receiver radio frequency front-end circuit of software radio, than traditional receiver radio frequency front-end circuit, compare and there is no mixing unit, radio-frequency front-end is directly given A/D converting unit by the signal of antenna reception through processing.
Seeing Fig. 1, is high frequency software radio receiving system block diagram representation of the present invention.It comprises receiving antenna, filtering circuit, low-noise amplification circuit (LAN), automatic gain control circuit, eeprom circuit and 2 SMA connectors.
2 SMA connectors of high frequency software radio system design of the present invention, wherein connect the antenna that receives high-frequency signal, another is as standby, and when our system is not used internal clock source, we can be by the external clock source that we need of this SMA connector.
When signal enters high frequency software radio receiving system circuit from SMA connector, enter subsequently a low-pass filter circuit, filtering clutter.See Fig. 2.
Signal, through after low-pass filtering, enters low-noise amplification circuit subsequently.See Fig. 3, low-noise amplification circuit of the present invention is to consist of 2 video algorithms amplifier modules, design can well be positioned at and amplify link input end like this, for given gain requirement, introduce as far as possible little internal noise, and obtain the signal to noise ratio (S/N ratio) of maximum possible and the amplifier that designs at output terminal.
When signal being carried out to low-noise amplification circuit design, we have designed automatic gain control circuit simultaneously on this basis.If the gain of receiver is constant, when input signal amplitude in very large range changes, also will there is the variation of same ratio in the amplitude of output signal, when strong signal, with regard to likely making receiver overload, causes blocking, when weak signal, likely cause again the loss of signal.In order to overcome this shortcoming, can adopt automatic gain control circuit, the gain of receiver is changed along with the power of input signal, when input signal is weak, receiver gain raises; When input signal is strong, receiver gain reduces, and with the impact of compensated input signal power, reaches and reduces the object that output level changes.
See Fig. 4, high frequency software radio system of the present invention has inserted an EEPROM(24LC024 or 24LC025) circuit, the data that can make like this pc pass through storage in EEPROM (24LC024 or 24LC025) chip are identified daughter board.This makes the host software can be according to the suitable system of installed daughter board Lookup protocol.EEPROM also can preserve some calibration values such as direct current biasing or IQ imbalance.If this EEPROM is not programmed, during running software on each pc, can print an alert message.
The receiver radio frequency front-end circuit of high frequency software radio of the present invention has been abandoned the mixing unit of traditional receiver radio frequency front-end circuit, and radio-frequency front-end is directly given A/D converting unit by the signal of antenna reception through processing.This not only has higher requirement to follow-up A/D sampling unit, Base-Band Processing, and also, to radio-frequency (RF) front-end circuit performance, the aspects such as stability have proposed new challenge.This radio frequency reception daughter board is applicable to the radio-frequency (RF) front-end circuit (not comprising antenna) of software radio basic structure, and this radio-frequency (RF) front-end circuit has the features such as highly sensitive, dynamic range is large, the linearity good, noise figure is low, working frequency range is wide.Software radio receiving system can comprise radio-frequency front-end, can receive the radiofrequency signal of a plurality of frequency ranges, multiple directions simultaneously, and can be exchanged into intermediate-freuqncy signal by a series of processing.Certainly, this is to carry out in the experiment of open loop.
Claims (4)
1. a high frequency software radio receiving system, it comprises receiving antenna, filtering circuit, low-noise amplification circuit, automatic gain control circuit, A/D converting unit, A/D sampling unit and 2 SMA connectors, it is characterized in that, for receiving the receiving antenna of the shortwave of DC-30MHz frequency range, connect A/D converting unit, a SMA connector connects respectively A/D converting unit, receiving antenna and filtering circuit, another SMA connector also connects filtering circuit, and external clock source, filtering circuit, low-noise amplification circuit, automatic gain control circuit and A/D sampling unit are contacted successively, high frequency software radio system has also inserted an eeprom circuit.
2. a kind of high frequency software radio receiving system as claimed in claim 1, is characterized in that, described low-noise amplification circuit comprises that 2 video algorithms amplifiers form difference channel.
3. a kind of high frequency software radio receiving system as claimed in claim 1, is characterized in that, 2 described SMA connectors are external up/down tuner or signal generator also.
4. a kind of high frequency software radio receiving system as claimed in claim 1, is characterized in that, stores the data with the daughter board of high frequency software radio receiving system with correlativity in described eeprom circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310639341.9A CN103675765B (en) | 2013-12-04 | 2013-12-04 | High-frequency software radio receiving system |
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| CN201310639341.9A CN103675765B (en) | 2013-12-04 | 2013-12-04 | High-frequency software radio receiving system |
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| CN103675765A true CN103675765A (en) | 2014-03-26 |
| CN103675765B CN103675765B (en) | 2016-04-13 |
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| CN201310639341.9A Expired - Fee Related CN103675765B (en) | 2013-12-04 | 2013-12-04 | High-frequency software radio receiving system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506205A (en) * | 2014-12-26 | 2015-04-08 | 重庆邮电大学 | Radio frequency system of software-defined radio receiver |
| CN105530048A (en) * | 2016-03-04 | 2016-04-27 | 西安长远电子工程有限责任公司 | Short-distance infrared wireless high-speed communication system and encoding method thereof |
| CN107678014A (en) * | 2017-08-23 | 2018-02-09 | 天津大学 | Software radio is in cognition passive radar system and implementation method |
Citations (3)
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| CN102183771A (en) * | 2011-03-21 | 2011-09-14 | 华南理工大学 | Realizing method of multi-mode GNSS (Global Navigation Satellite System) software receiver based on multi-core processor |
| CN202041640U (en) * | 2011-01-18 | 2011-11-16 | 西安理工大学 | Satellite navigation software receiver based on GPU |
| CN103152111A (en) * | 2012-12-31 | 2013-06-12 | 南昌大学 | Software radio test platform based on universal serial bus (USB) interface |
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2013
- 2013-12-04 CN CN201310639341.9A patent/CN103675765B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202041640U (en) * | 2011-01-18 | 2011-11-16 | 西安理工大学 | Satellite navigation software receiver based on GPU |
| CN102183771A (en) * | 2011-03-21 | 2011-09-14 | 华南理工大学 | Realizing method of multi-mode GNSS (Global Navigation Satellite System) software receiver based on multi-core processor |
| CN103152111A (en) * | 2012-12-31 | 2013-06-12 | 南昌大学 | Software radio test platform based on universal serial bus (USB) interface |
Non-Patent Citations (2)
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| 卢光军 等: "一种基于集群计算的软件无线电接收系统实现", 《微电子学与计算机》, vol. 25, no. 10, 31 October 2008 (2008-10-31) * |
| 王保民 等: "基于软件无线电的高频多普勒接收机设计", 《数据采集与处理》, vol. 21, 31 December 2006 (2006-12-31), pages 109 - 113 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506205A (en) * | 2014-12-26 | 2015-04-08 | 重庆邮电大学 | Radio frequency system of software-defined radio receiver |
| CN105530048A (en) * | 2016-03-04 | 2016-04-27 | 西安长远电子工程有限责任公司 | Short-distance infrared wireless high-speed communication system and encoding method thereof |
| CN107678014A (en) * | 2017-08-23 | 2018-02-09 | 天津大学 | Software radio is in cognition passive radar system and implementation method |
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| CN103675765B (en) | 2016-04-13 |
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Granted publication date: 20160413 Termination date: 20191204 |