CN103675765B - High-frequency software radio receiving system - Google Patents
High-frequency software radio receiving system Download PDFInfo
- Publication number
- CN103675765B CN103675765B CN201310639341.9A CN201310639341A CN103675765B CN 103675765 B CN103675765 B CN 103675765B CN 201310639341 A CN201310639341 A CN 201310639341A CN 103675765 B CN103675765 B CN 103675765B
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- China
- Prior art keywords
- circuit
- frequency
- software radio
- receiving system
- low
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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
- 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
-
- 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
Abstract
A kind of 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, receiving antenna for receiving the shortwave of DC-30MHz frequency range connects A/D converting unit, a SMA connector connects A/D converting unit respectively, 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 also inserts an eeprom circuit, receiving system of the present invention has and can directly receive broadband radiofrequency signal and be translated into intermediate-freuqncy signal, and then directly can enter analog-to-digital conversion module and carry out a series of process such as sample.Receiving system of the present invention has the advantages that circuit structure is compact, cost is low, is applicable to very much building miniradar system.
Description
Technical field
The present invention relates to a kind of high frequency general software radio technical field, particularly relate to a kind of high-frequency software radio receiving system.
Background technology
High-frequency software radio receiving system is a kind of radio-frequency receiving system working in 6MHz-30MHz.The multiple technologies means such as it relates to ultra-wideband antenna Theory and technology, low-noise amplifier circuit designs, the access of the application of low-pass filter circuit, in addition eeprom chip.The modal application form of high-frequency software radio receiving system builds software radio system, it generally uses as the radio-frequency front-end of high frequency general software radio system, its effect the signal received is down-converted to base band to realize the conversion between analog radio-frequency signal and analog if signal, thus the speed, precision etc. that solve A/D and D/A cannot reach the problem that radio frequency simulating signal directly carries out sampling, 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 overall comparatively huge and complicated, limits the frequency of Received signal strength, 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, and circuit structure be compact, the feature of the fast and applied range of conversion speed.
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, receiving antenna for receiving the shortwave of DC-30MHz frequency range connects A/D converting unit, a SMA connector connects A/D converting unit respectively, 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 also inserts an eeprom circuit,
Described low-noise amplification circuit comprises 2 video algorithms amplifier composition difference channels;
2 described SMA connectors also external up/down tuner or signal generator;
The data with the daughter board of high-frequency software radio receiving system with correlativity are stored in described eeprom circuit.
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, the radiofrequency signal of 0-30MHz can be received, and the signal received is down-converted to base band to realize the conversion between analog radio-frequency signal and analog if signal, thus the speed, precision etc. that solve A/D and D/A cannot reach the problem that radio frequency simulating signal directly carries out sampling.Receiving system of the present invention has and can directly receive broadband radiofrequency signal and be translated into intermediate-freuqncy signal, and then directly can enter analog-to-digital conversion module and carry out a series of process such as sample.Receiving system of the present invention has the advantages that circuit structure is compact, 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 it and 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 A/D converting unit, receiving antenna and filtering circuit respectively, 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 also inserts an eeprom circuit;
Receiving antenna: the design of this system acceptance 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 antialiasing simultaneously;
Low-noise amplification circuit: be positioned at amplification link input, for given gain requirement, introduces internal noise little as far as possible, and obtains the signal to noise ratio (S/N ratio) of maximum possible and the amplifier that designs at output terminal.The present invention adopts 2 video algorithms amplifier composition difference channels, with the low noise enlarging function of realizing circuit;
Automatic gain control circuit: in wireless communications, because receiving the difference in radio station, the change of communication distance, the damping capacity change of Electromagnetic Wave Propagation channel and receiver environmental change etc., all can there is very large fluctuation in the signal intensity that receiver receives.It is contemplated that, if the gain of receiver is constant, when input signal amplitude in very large range changes, also the change of same ratio will be there is in the amplitude of output signal, just likely make when strong signal receiver transship and cause blocking, when weak signal, then 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 namely 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 the object reducing output level change;
Eeprom circuit: each daughter board has a plate to carry EEPROM(24LC024 or 24LC025 of I2C) enable system identify daughter board.This makes host software can according to the suitable system of installed daughter board Lookup protocol.It is uneven that EEPROM also can preserve some calibration values such as direct current biasing or IQ.If this EEPROM is not programmed, during running software on each pc, an alert message can be printed;
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 receive based on high-frequency signal, be applicable to the receiver radio frequency front-end circuit of software radio, compare without mixing unit than traditional receivers radio-frequency (RF) front-end circuit, the signal that antenna receives directly is given A/D converting unit through process by radio-frequency front-end.
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 of the present invention, wherein connect the antenna receiving high-frequency signal, another is as subsequent use, and when our system does not use internal clock source, we can 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 a low-pass filter circuit subsequently, filtering clutter.See Fig. 2.
Signal, after low-pass filtering, enters low-noise amplification circuit subsequently.See Fig. 3, low-noise amplification circuit of the present invention is made up of 2 video algorithms amplifier modules, such design can well be positioned at amplification link input, for given gain requirement, introduce internal noise little as far as possible, and obtain the signal to noise ratio (S/N ratio) of maximum possible and the amplifier that designs at output terminal.
When carrying out low-noise amplification circuit design to signal, we devise 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 change of same ratio in the amplitude of output signal, just likely makes receiver transship and cause blocking when strong signal, when weak signal, then 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 namely 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 the object reducing output level change.
See Fig. 4, high-frequency software radio system of the present invention inserts EEPROM(24LC024 or 24LC025) circuit, pc can be made like this by EEPROM(24LC024 or 24LC025) data that store in chip identify daughter board.This makes host software can according to the suitable system of installed daughter board Lookup protocol.It is uneven that EEPROM also can preserve some calibration values such as direct current biasing or IQ.If this EEPROM is not programmed, during running software on each pc, an alert message can be printed.
The mixing unit of traditional receivers radio-frequency (RF) front-end circuit abandoned by the receiver radio frequency front-end circuit of high-frequency software radio of the present invention, and the signal that antenna receives directly is given A/D converting unit through process by radio-frequency front-end.This not only has higher requirement to follow-up A/D sampling unit, Base-Band Processing, also radio frequency front-end circuit performance, and the aspects such as stability propose 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 multiple frequency range, multiple directions simultaneously, and can be exchanged into intermediate-freuqncy signal by a series of process.Certainly, this carries 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, receiving antenna for receiving the shortwave of DC-30MHz frequency range connects A/D converting unit, a SMA connector connects A/D converting unit respectively, 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 also inserts 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 2 video algorithms amplifier composition difference channels.
3. a kind of high-frequency software radio receiving system as claimed in claim 1, is characterized in that, 2 described SMA connectors also external up/down tuner or signal generator.
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 CN103675765A (en) | 2014-03-26 |
| CN103675765B true CN103675765B (en) | 2016-04-13 |
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| CN104506205B (en) * | 2014-12-26 | 2017-11-10 | 重庆邮电大学 | A kind of software radio receiver radio system |
| CN105530048B (en) * | 2016-03-04 | 2018-01-05 | 西安长远电子工程有限责任公司 | A kind of communication code method being located in short distance infrared radio high-speed communication system |
| 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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Patent Citations (3)
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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 |
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| 一种基于集群计算的软件无线电接收系统实现;卢光军 等;《微电子学与计算机》;20081031;第25卷(第10期);第80-82,86页 * |
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Granted publication date: 20160413 Termination date: 20191204 |