CN207339907U - A kind of very low frequency fanaticism number demodulates verification system - Google Patents
A kind of very low frequency fanaticism number demodulates verification system Download PDFInfo
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- CN207339907U CN207339907U CN201721477292.3U CN201721477292U CN207339907U CN 207339907 U CN207339907 U CN 207339907U CN 201721477292 U CN201721477292 U CN 201721477292U CN 207339907 U CN207339907 U CN 207339907U
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Abstract
The utility model discloses a kind of very low frequency fanaticism number to demodulate verification system, including：Host computer and the blind signal demodulating system of very low frequency, the blind signal demodulating system of very low frequency include：With the ZYNQ chips of host computer network connection, the first digital analog converter and the second digital analog converter being connected respectively with two output terminals of ZYNQ chips, the IQ modulation circuits being connected respectively with the first digital analog converter and the second digital analog converter, the power amplifier being connected with IQ modulation circuits, and the first TTL interfaces for clock signal being connected with ZYNQ chips.The beneficial effects of the utility model are：By technologies such as ZYNQ, two-way DA, orthogonal amplifying circuits, signal multi-mode under very low frequency, variable carrier frequency modulation telecommunication function are completed, is to provide verification platform in very low frequency demodulating system.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of very low frequency fanaticism number demodulation verification system.
Background technology
The transmission of signal in wireless channel is realized using the propagation of electromagnetic wave in space.Very low frequency refers to frequency
In the electromagnetic wave of 3~30KHz, it carries out sky-wave transmission along the effective waveguide formed between d-layer and atmospheric surface.It is more
Number is as submarine communication, telecommunication, overlength distance navigation, remote navigation, wireless heartbeats frequency detector, geophysics
Search of life and property etc. when learning research and snowslide.Very low frequency receives and dispatches measuring technology, and current relevant research is less, is mostly
The modulating system formed using FPGA or special chip, frequency range is mainly in intermediate frequency or high frequency field, in the transmitting-receiving of very low frequency
In test, studies in China is nearly at blank.But modulation, the demodulation of very low frequency have extremely important under water, in telecommunication
Status.
The content of the invention
The present invention provides a kind of very low frequency fanaticism number to demodulate verification system, the technical problem for solving the prior art.
The technical solution that the present invention solves above-mentioned technical problem is as follows：
A kind of very low frequency fanaticism number demodulates verification system, including：Host computer and the blind signal demodulating system of very low frequency, it is described very
The blind signal demodulating system of low frequency includes：With the ZYNQ chips of the host computer network connection, respectively with the two of the ZYNQ chips
The first digital analog converter and the second digital analog converter of a output terminal connection, respectively with first digital analog converter and described the
Two digital analog converters connection IQ modulation circuits, the power amplifier being connected with the IQ modulation circuits, and with the ZYNQ
The first TTL interfaces for being used to receive clock signal of chip connection.
The beneficial effects of the invention are as follows：By technologies such as ZYNQ, two-way DA, orthogonal amplifying circuits, complete under very low frequency
Signal multi-mode, variable carrier frequency modulation telecommunication function, are to provide verification platform in very low frequency demodulating system, can be not only very low frequency
Demodulating system provides test function, and important meaning is played to other very low frequency testing fields.
Based on the above technical solutions, the present invention can also be improved as follows.
Preferably, the ZYNQ chips include：With the IQ split circuits of the host computer network connection, respectively with the IQ
Split circuit two output terminals connection the first interpolation shaping filter circuit and the second interpolation shaping filter circuit, and with institute
State the feedback control circuit of IQ modulation circuits connection；The first interpolation shaping filter circuit connects with first digital analog converter
Connect, the second interpolation shaping filter circuit is connected with second digital analog converter.
Preferably, the first interpolation shaping filter circuit and second interpolation shaping filter circuit include：FIR is filtered
Ripple device.
Preferably, the feedback control circuit includes：The phase-locked loop circuit and direct digital frequency synthesier of interconnection
Device, the Direct Digital Synthesizer are connected with the IQ modulation circuits.
Preferably, the verification system further includes：The oscillograph being connected with the power amplifier.
Preferably, the blind signal demodulating system of the very low frequency includes：What is be connected with the ZYNQ chips is used for reception modulation
2nd TTL interfaces of signal.
Brief description of the drawings
Fig. 1 is the structure diagram that a kind of very low frequency fanaticism number provided in an embodiment of the present invention demodulates verification system；
Fig. 2 is the structure diagram that a kind of very low frequency fanaticism number that another embodiment of the present invention provides demodulates verification system；
Fig. 3 is the structure diagram that a kind of very low frequency fanaticism number that another embodiment of the present invention provides demodulates verification system；
Fig. 4 is the structure diagram that a kind of very low frequency fanaticism number that another embodiment of the present invention provides demodulates verification system.
Embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, a kind of very low frequency fanaticism number demodulation verification system, including：Host computer 1 and the demodulation of very low frequency fanaticism number
System 2, the blind signal demodulating system 2 of very low frequency include：With the ZYNQ chips 21 of 1 network connection of host computer, respectively with ZYNQ chips
21 two output terminals connection the first digital analog converter 22 and the second digital analog converter 23, respectively with the first digital analog converter 22
With the IQ modulation circuits 24 of the second digital analog converter 23 connection, the power amplifier 25, Yi Jiyu being connected with IQ modulation circuits 24
The first TTL interfaces 26 for being used to receive clock signal that ZYNQ chips 2 connect.
Pass through ZYNQ, two-way DA (the first digital analog converter 22 and the second digital analog converter 23), orthogonal amplifying circuit (IQ tune
Circuit 24 and power amplifier 25 processed) etc. technology, complete signal multi-mode under very low frequency, variable carrier frequency modulation telecommunication function, be
Verification platform is provided in very low frequency demodulating system, not only can provide test function for very low frequency demodulating system, it is very low to other
Frequency testing field plays important meaning.
As shown in Fig. 2, the ZYNQ chips 21 shown in Fig. 1 include：With the IQ split circuits 211 of 1 network connection of host computer, divide
The the first interpolation shaping 212 and second interpolation molding filtration of filter circuit not being connected with two output terminals of IQ split circuits 211
Circuit 213, and the feedback control circuit 214 being connected with IQ modulation circuits 24；First interpolation is molded filter circuit 212 and first
Digital analog converter 22 connects, and the second interpolation shaping filter circuit 213 is connected with the second digital analog converter 23.
Specifically, 212 and second interpolation of the first interpolation shaping filter circuit shaping filter circuit 213 includes：FIR is filtered
Device.
Specifically, feedback control circuit 214 includes：The phase-locked loop circuit PLL and Direct Digital frequency of interconnection are closed
Grow up to be a useful person DDS, and Direct Digital Synthesizer is connected with IQ modulation circuits 24.
As shown in Fig. 2, verification system further includes：The oscillograph 3 being connected with power amplifier 25.
The blind signal demodulating system 2 of very low frequency further includes：Be connected with ZYNQ chips 21 be used for receive the second of modulated signal
TTL interfaces 27.
As shown in figure 3, modulating system is divided into two parts, a part completes the numeral of modulation in the high performance FPGA of ZYNQ
Signal processing, ZYNQ mainly completes the IQ separation of modulated signal, and digital signal is handled into row interpolation, shaping filter.
Digital PLL is carried out inside ZYNQ, variable clock signal is provided for DDS.
IQ modulation is exactly that data are divided into two-way, carries out carrier modulation respectively, two-way carrier wave is mutually orthogonal.I is in-phase
(same to phase), Q are quadrature (orthogonal).Orthogonal signalling are exactly that two-way frequency is identical, and phase differs 90 degree of carrier wave, general to use
Sin and cos, with I, Q two paths of signals modulates latter transmitting respectively, so as to improve the availability of frequency spectrum.
In Modern wireless communication, the spectral range of baseband signal is all wider.It is total to wish every in order to efficiently use channel
The spread spectrum of a symbol waveform is as small as possible, to reduce wave distortion, while the extension of symbol waveform in time to the greatest extent may be used
Can be small.But in the range of the frequency spectrum of any signal and period can not possibly narrow down to any one value at the same time, so
When design, it would be desirable to fully take into account on the premise of meeting to eliminate ISI intersymbol interferences, compress spectral bandwidth and improve
Band efficiency.Generally by forming filter come what is realized, the effect of forming filter mainly has two for waveform shaping：Disappear
Except intersymbol interference；Accelerate spectrum modulation signal attenuation outside a channel, improve band efficiency.Digital filter can pass through two ways
To realize：Finite impulse response and infinite-duration impulse response, i.e., usually said FIR and IIR.In view of the characteristic of FIR and IIR,
We will design forming filter using FIR filter in this programme.
As shown in figure 4, another part completes modulating system simulation process, the base band that variable bit rate is carried out using two-way DA is believed
Number, realize variable carrier frequency using DDS, carrier-frequency range be able to can be set from 8K~30M, carrier frequency stepping, and binary channels DA signals are carried with DDS
Frequency signal, carries out coherent modulation to it by multiplier and adder, obtains modulated signal, finally send modulated signal to power
Amplifier PA.
Correct connection reference clock signal, and the output terminal of the system of verification is accessed into oscillograph.It is from host computer to modulation
System input digital baseband signal, sets the parameters such as correct carrier frequency, modulating mode, modulating system is according to above-mentioned ginseng in host computer
Several that digital baseband signal is modulated, Observable modulated signal exports in oscillograph.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of very low frequency fanaticism number demodulates verification system, it is characterised in that including：Host computer and very low frequency fanaticism number demodulation system
System, the blind signal demodulating system of very low frequency include：With the ZYNQ chips of the host computer network connection, respectively with the ZYNQ
Chip two output terminals connection the first digital analog converter and the second digital analog converter, respectively with first digital analog converter
The IQ modulation circuits connected with second digital analog converter, the power amplifier being connected with the IQ modulation circuits, Yi Jiyu
The first TTL interfaces for being used to receive clock signal of the ZYNQ chips connection.
A kind of 2. very low frequency fanaticism number demodulation verification system according to claim 1, it is characterised in that the ZYNQ chips
Including：With the IQ split circuits of the host computer network connection, it is connected respectively with two output terminals of the IQ split circuits
First interpolation is molded filter circuit and the second interpolation shaping filter circuit, and the feedback control being connected with the IQ modulation circuits
Circuit；The first interpolation shaping filter circuit is connected with first digital analog converter, and second interpolation is molded filtered electrical
Road is connected with second digital analog converter.
A kind of 3. very low frequency fanaticism number demodulation verification system according to claim 2, it is characterised in that first interpolation
Molding filtration circuit and second interpolation shaping filter circuit include：FIR filter.
A kind of 4. very low frequency fanaticism number demodulation verification system according to claim 2, it is characterised in that the feedback control
Circuit includes：The phase-locked loop circuit and Direct Digital Synthesizer of interconnection, the Direct Digital Synthesizer
It is connected with the IQ modulation circuits.
5. verification system is demodulated according to a kind of very low frequency fanaticism number of claim 1-4 any one of them, it is characterised in that described
Verification system further includes：The oscillograph being connected with the power amplifier.
6. verification system is demodulated according to a kind of very low frequency fanaticism number of claim 1-4 any one of them, it is characterised in that described
The blind signal demodulating system of very low frequency further includes：What is be connected with the ZYNQ chips is used to receive the 2nd TTL interfaces of modulated signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721477292.3U CN207339907U (en) | 2017-11-07 | 2017-11-07 | A kind of very low frequency fanaticism number demodulates verification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721477292.3U CN207339907U (en) | 2017-11-07 | 2017-11-07 | A kind of very low frequency fanaticism number demodulates verification system |
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| Publication Number | Publication Date |
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| CN207339907U true CN207339907U (en) | 2018-05-08 |
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|---|---|---|---|
| CN201721477292.3U Expired - Fee Related CN207339907U (en) | 2017-11-07 | 2017-11-07 | A kind of very low frequency fanaticism number demodulates verification system |
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2017
- 2017-11-07 CN CN201721477292.3U patent/CN207339907U/en not_active Expired - Fee Related
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Effective date of registration: 20220705 Address after: 518000 404, building 37, chentian Industrial Zone, chentian community, Xixiang street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Huaxun ark Photoelectric Technology Co.,Ltd. Address before: 430074 No. 2, floor 5, building 03, Yinjiu science and Technology Industrial Park (phase II), No. 35, Guanggu Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee before: WUHAN HUAXUN GUORONG TECHNOLOGY CO.,LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180508 |