CN204013507U - A kind of ultrashort wave number based on software radio framework passes receiving system - Google Patents
A kind of ultrashort wave number based on software radio framework passes receiving system Download PDFInfo
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- CN204013507U CN204013507U CN201420325935.2U CN201420325935U CN204013507U CN 204013507 U CN204013507 U CN 204013507U CN 201420325935 U CN201420325935 U CN 201420325935U CN 204013507 U CN204013507 U CN 204013507U
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Abstract
The utility model discloses a kind of ultrashort wave number based on software radio framework and pass receiving system, comprising: radio-frequency unit and software radio module; Radio-frequency unit is connected with software radio module; Radio-frequency unit comprises receiver module and down conversion module, and the output of receiver module connects the input of down conversion module; Software radio module comprises A/D modular converter, Digital Down Converter Module, demodulation module and D/A modular converter; The input of A/D modular converter connects the output of down conversion module; The input of Digital Down Converter Module connects the output of A/D modular converter; The input of demodulation module connects the output of Digital Down Converter Module; The input of D/A modular converter connects the output of demodulation module.The utility model has overcome traditional station can only adopt AM/FM low-order-modulated method, by software approach, realizes higher order modulation schemes, makes transfer of data variation, and transmission comprises the information such as voice, picture and fax.
Description
Technical field
The utility model belongs to telecommunications context, relates in particular to a kind of ultrashort wave number based on software radio framework and passes receiving system.
Background technology
The emergency system of current operation on the sea is mainly telephonic communication system and traditional station receiving system.Telephone communication mode, once there is spontaneous combustion disaster, war, take optical cable when main transmission medium and mobile base station are destroyed, and emergency commading system will paralyse; Traditional radio station receiving system is mostly the hardware system based on simulation, in addition demodulation mode mostly adopts the demodulation modes such as AM, SSB, FM, demodulation mode single makes the receiving system can only receiving speech information, cannot receive comparatively complicated image, fax digital information, inefficiency.Be accompanied by the fast development of various communication modes, the voice messaging by single of transmission information is transformed into image, and the various ways such as fax are therefore more and more higher to the requirement of receiving equipment.Because the employing hardware simulation circuit of traditional station receiving system is realized, be unfavorable for the expansion and upgrading of this system follow-up function.
The at present digitlization of receiving equipment, new demodulation mode is by the developing direction that is following receiving system flexibly, and the hardware system of tradition based on simulation replaced by digital circuit or software gradually.The ultrashort wave of launching due to radio station has very high frequency, can not be by digital circuit or software demodulation and processing.So need a kind of receiving system badly, meet diversified communication and ultrashort wave receiving system, to tackle the operation on the sea becoming increasingly complex, improve promptness, the safety and reliability of marine emergency system.
Utility model content
The utility model provides a kind of ultrashort wave number based on software radio framework to pass receiving system, has advantages of simple in structure and has a diversified communication.
The utility model proposes a kind of ultrashort wave number based on software radio framework and pass receiving system, comprise radio-frequency unit and software radio module; Described radio-frequency unit is connected with described software radio module; Described radio-frequency unit comprises receiver module and down conversion module, and the output of described receiver module connects the input of described down conversion module; Described software radio module comprises A/D modular converter, Digital Down Converter Module, demodulation module and D/A modular converter; The input of described A/D modular converter connects the output of described down conversion module; The input of described Digital Down Converter Module connects the output of described A/D modular converter; The input of described demodulation module connects the output of described Digital Down Converter Module; The input of described D/A modular converter connects the output of described demodulation module.
The described ultrashort wave number based on software radio framework the utility model proposes passes in receiving system, and described Digital Down Converter Module comprises: two frequency mixers, digital controlled oscillator, cic filter, HB filter and FIR filters; Two outputs of described digital controlled oscillator are connected respectively two described frequency mixers with two outputs of described A/D modular converter, the output of two described frequency mixers connects respectively the input of described cic filter, the input of described HB filter connects the output of described cic filter, the input of described FIR filter connects the output of described HB filter, and the output of described FIR filter connects described demodulation module.
The described ultrashort wave number based on software radio framework the utility model proposes passes in receiving system, described software radio module further comprises CLK clock signal module, and the output of described CLK clock signal module is connected with described A/D modular converter, described Digital Down Converter Module, described demodulation module and described D/A modular converter respectively.
The described ultrashort wave number based on software radio framework the utility model proposes passes in receiving system, and described A/D modular converter adopts AD9255 chip, and described D/A modular converter adopts AD9707 chip.
The described ultrashort wave number based on software radio framework the utility model proposes passes in receiving system, and described demodulation module is 8-level CPFSK demodulation module.
The ultrashort wave number of the utility model based on software radio framework passes receiving system, by access Digital Down Converter Module, realize digital signal is moved to baseband signal, and access 8-level CPFSK demodulation module and realize the demodulation to baseband signal, due to baseband signal institute energy transmit diversity information, comprise complicated image and fax etc., thereby overcome traditional station and can only, by the defect of transmission AM, the single demodulation mode receiving speech information of single sideband demodulation, realize diversified Function Extension.The utility model is transformed into traditional hardware based receiving system in integrated circuit and realizes, and reduces development cost and cycle, and simple to operate, simultaneously all right practical function upgrading and in time system update.
Accompanying drawing explanation
Fig. 1 is that the utility model passes the structural representation of receiving system based on the ultrashort wave number of software radio framework.
Fig. 2 is the structural representation of Digital Down Converter Module.
Fig. 3 a is the oscillogram of cic filter output baseband signal, and Fig. 3 b is the oscillogram of HB filter output baseband signal, and Fig. 3 c is the oscillogram of FIR filter output baseband signal.
Embodiment
In conjunction with following specific embodiments and the drawings, the utility model is described in further detail.Implement process of the present utility model, condition, experimental technique etc., except the content of mentioning specially below, be universal knowledege and the common practise of this area, the utility model is not particularly limited content.
In the utility model, related " module " all refers to the circuit of chip inner burning or intrinsic program and connection thereof, and in chip, institute's burning or intrinsic program are existing known technology.
The ultrashort wave number of the utility model based on software radio framework passes receiving system, by access Digital Down Converter Module, high frequency analog signals is converted to the baseband signal that can be processed by FPGA, demodulation module of the present utility model is 8-Level CPFSK demodulation module simultaneously, utilize the 8-Level CPFSK mode of demodulation module to carry out signal demodulation, overcome traditional station and can only transmit AM, the defect of the single demodulation mode of single sideband demodulation, make transfer of data variation, can not only transmitting voice information, can also transmitting image, the information such as fax, meet the diversified demand of existing transfer of data.
Fig. 1 is that the utility model passes the system framework of receiving system based on the ultrashort wave number of software radio framework.The utility model comprises: radio-frequency unit 100 and software radio module 200.Radio-frequency unit 100 is connected with software radio module 200.The radio signal that radio-frequency unit 100 sends for receiving radio station, and the signal receiving is carried out to down-converted and reduce its frequency and obtain analog intermediate frequency signal.Software radio module 200 is converted to this analog intermediate frequency signal the digital signal of intermediate frequency, and obtain the digital signal for exporting after the digital signal of intermediate frequency is calculated to Digital Down Convert, the processing of multistage filtering extraction and demodulation, this digital signal is carried out generating the analog signal with broadcasting for demonstrations such as display, loud speakers after digital-to-analogue conversion.The utility model can not only receiving speech information, can also receive the information such as image and fax, meets the diversified demand of existing transfer of data.The utility model also can be transformed into traditional hardware based receiving system in integrated circuit and realize, and reduces development cost and cycle and simple to operate, simultaneously all right practical function upgrading and in time system update.
Consult Fig. 1, radio-frequency unit 100 comprises receiver module 110 and down conversion module 120.The output of receiver module 110 connects the input of down conversion module 120.Receiver module 110 is for receiving high frequency analog signals, and down conversion module 120 is for downconverting to analog intermediate frequency signal by high frequency analog signals.
Consult Fig. 1, software radio module 200 comprises A/D modular converter 210, Digital Down Converter Module 220, demodulation module 230 and D/A modular converter 240.A/D modular converter 210 adopts AD9255 chip, and the input of A/D modular converter 210 connects the output of down conversion module 120.The input of Digital Down Converter Module 220 connects the output of A/D modular converter 210.Demodulation module 230 is 8-level CPFSK demodulation module.The input of demodulation module 230 connects the output of Digital Down Converter Module 220.D/A modular converter 240 adopts AD9707 chip, and the input of D/A modular converter 240 connects the output of demodulation module 230.
Below in conjunction with Fig. 2, the structure of software radio module 200 and function thereof are described further.
A/D modular converter 210 carries out bandpass sampling by the analog intermediate frequency signal receiving in radio-frequency unit 100, realizes analog intermediate frequency signal to the conversion of the digital signal of intermediate frequency.
Digital Down Converter Module 220 comprises two frequency mixers, digital controlled oscillator 221, cic filter 222, HB filter 223 and FIR filter 224.Two outputs of digital controlled oscillator 221 are connected respectively two frequency mixers with two outputs of A/D modular converter 210.The output of two frequency mixers connects respectively the input of cic filter 222, the input of HB filter 223 connects the output of cic filter 222, the input of FIR filter 224 connects the output of HB filter 223, and the output of FIR filter 224 connects demodulation module 230.The local oscillation signal of discretization of digital controlled oscillator 221 outputs and the digital signal of the intermediate frequency of A/D modular converter 210 are carried out quadrature mixing in frequency mixer, thereby the broader frequency spectrum of the digital signal of intermediate frequency is adjusted to baseband signal, by frequency mixer, exports initial baseband signal.Now the frequency of the initial baseband signal of two-way is still the frequency in A/D bandpass sampling, and data transfer rate is high, and the bandwidth of signal is much smaller than sample frequency.In the present embodiment, the IF-FRE of being carried out the analog intermediate frequency signal of bandpass sampling by A/D modular converter 210 is f0=51.2MHz, and the sample frequency of A/D modular converter 210 is fs=49.6MHz, and signal bandwidth is decided to be 10MHz.The centre frequency of the baseband signal that the two-way that therefore, generates after the digital signal of the intermediate frequency of A/D modular converter 210 output and local oscillation signal mixing is initial is 49.6MHz.Because the frequency of the initial baseband signal of two-way is too high, cannot be applicable to the subsequent treatment of FPGA, therefore in the utility model, introduced Digital Down Converter Module 220, two-way baseband signal reduces the frequency of baseband signal through the multistage filtering extraction of Digital Down Converter Module 220.
In Digital Down Converter Module 220, cic filter 222 (Cascaded-Integrator-Comb, cascade integral comb filter), as the first order of multistage filtering extraction, can reach very high processing speed and carry out large extraction factor work.In the present embodiment, cic filter 222 can be realized the extraction of 8 times.The initial base-band signal frequency of input cic filter 222 is 49.6MHz, bandwidth is 0.8MHz, in this process, cic filter is realized the extraction of 8 times to the baseband signal of 49.6MHz, output signal frequency is reduced to 5.12MHz, and the waveform of the initial baseband signal of cic filter 222 outputs is referring to Fig. 3 a.
HB filter 223 (half-band filter), as the second level of extracting, is realized the extraction of 2 times, extracts the factor and is fixed as 2, can complete the requirement that sample rate reduces half.In the present embodiment, the frequency of the baseband signal of input HB filter 223 is 5.12MHz, through 2 times of extractions of HB filter 223, the frequency of the baseband signal of the low frequency of output is 2.56MHz, and the waveform of the baseband signal of the low frequency of HB filter 223 outputs is referring to Fig. 3 b.
FIR filter 224, as the third level of multistage extraction, for the compensation filter as Digital Down Convert, to realize the shaping filter to whole channel, also can be used as matched filter.FIR filter 224 does not carry out reduction of speed to baseband signal, and the frequency of the baseband signal of output is still that the waveform of baseband signal of 2.56MHz FIR filter 224 output is referring to Fig. 3 c.
Two-way baseband signal through repeatedly extract with filtering after, obtain the baseband signal for demodulation.Now this baseband signal is delivered to and in demodulation module 230, carried out demodulation, demodulation module 230 is 8-Leve l CPFSK demodulation module, by 8-Leve l CPFSK demodulation mode, therefrom obtain corresponding digital signal, in this digital signal, include the data such as image and sound.This digital signal is carried out to digital-to-analogue conversion through D/A modular converter 240, obtain demodulated analog signal.D/A modular converter 240 can connect computer and other equipment, realizes the expansion of diversified informational function.
Consult Fig. 2, in software radio module 200, be provided with a CLK clock signal module 250, CLK clock signal module 250 is that A/D modular converter 210, digital controlled oscillator (NCO) 221, cic filter 222, HB filter 223, FIR filter 224, demodulation module 230 and D/A modular converter 240 provide identical clock signal.
The utility model is particularly useful for marine traditional communication satellite, shortwave, ultra short wave communication, with respect to short wave channel, ultrashort wave is mainly by direct wave communication, in Long time scale, can be used as be invariable to its channel parameter, thus ultra short wave communication more reliably also more simply, more stable.With respect to the good satellite communication of communication, the utility model is simple in structure, and cost is lower.Because ultra short wave communication has stable, simple, communication frequency compared with high, in recent years, in civil area and military domain, be widely used raising.The flexibility of ultra short wave communication just in time meets dispatch control, and the uncertainty of emergency communication place, time and communication form is for example utilized trunking, and ultra short wave communication can cover very wide scope, has brought into play important effect in emergency communication.Therefore, the utility model can be used as the emergent receiving system of operation on the sea ship, can complete well emergency communication.
Protection content of the present utility model is not limited to above embodiment.Do not deviating under the spirit and scope of utility model design, variation and advantage that those skilled in the art can expect are all included in the utility model, and take appending claims as protection range.
Claims (5)
1. the ultrashort wave number based on software radio framework passes a receiving system, it is characterized in that, comprises radio-frequency unit (100) and software radio module (200); Described radio-frequency unit (100) is connected with described software radio module (200);
Described radio-frequency unit (100) comprises receiver module (110) and down conversion module (120), and the output of described receiver module (110) connects the input of described down conversion module (120);
Described software radio module (200) comprises A/D modular converter (210), Digital Down Converter Module (220), demodulation module (230) and D/A modular converter (240); The input of described A/D modular converter (210) connects the output of described down conversion module (120); The input of described Digital Down Converter Module (220) connects the output of described A/D modular converter (210); The input of described demodulation module (230) connects the output of described Digital Down Converter Module (220); The input of described D/A modular converter (240) connects the output of described demodulation module (230).
2. the ultrashort wave number based on software radio framework as claimed in claim 1 passes receiving system, it is characterized in that, described Digital Down Converter Module (220) comprising: two frequency mixers, digital controlled oscillator (221), cic filter (222), HB filter (223) and FIR filters (224); Two outputs of described digital controlled oscillator (221) are connected respectively two described frequency mixers with two outputs of described A/D modular converter (210), the output of two described frequency mixers connects respectively the input of described cic filter (222), the input of described HB filter (223) connects the output of described cic filter (222), the input of described FIR filter (224) connects the output of described HB filter (223), and the output of described FIR filter (224) connects described demodulation module (230).
3. the ultrashort wave number based on software radio framework as claimed in claim 1 passes receiving system, it is characterized in that, described software radio module (200) further comprises CLK clock signal module (250), and the output of described CLK clock signal module (250) is connected with described A/D modular converter (210), described Digital Down Converter Module (220), described demodulation module (230) and described D/A modular converter (240) respectively.
4. the ultrashort wave number based on software radio framework as claimed in claim 1 passes receiving system, it is characterized in that, described A/D modular converter (210) adopts AD9255 chip, and described D/A modular converter (240) adopts AD9707 chip.
5. the ultrashort wave number based on software radio framework as claimed in claim 1 passes receiving system, it is characterized in that, described demodulation module (230) is 8-level CPFSK demodulation module.
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| CN201420325935.2U CN204013507U (en) | 2014-06-18 | 2014-06-18 | A kind of ultrashort wave number based on software radio framework passes receiving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107135007A (en) * | 2017-04-12 | 2017-09-05 | 西安科技大学 | A kind of zero intermediate frequency reciver system and its method of reseptance based on software radio |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107135007A (en) * | 2017-04-12 | 2017-09-05 | 西安科技大学 | A kind of zero intermediate frequency reciver system and its method of reseptance based on software radio |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20150618 |
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| EXPY | Termination of patent right or utility model |