CN203057131U - Shortwave communication channel device for broadband - Google Patents
Shortwave communication channel device for broadband Download PDFInfo
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- CN203057131U CN203057131U CN2012207243509U CN201220724350U CN203057131U CN 203057131 U CN203057131 U CN 203057131U CN 2012207243509 U CN2012207243509 U CN 2012207243509U CN 201220724350 U CN201220724350 U CN 201220724350U CN 203057131 U CN203057131 U CN 203057131U
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- 238000004891 communication Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000010355 oscillation Effects 0.000 description 8
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- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
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- 238000005086 pumping Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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Abstract
The utility model provides a shortwave communication channel device for a broadband. The shortwave communication channel device for the broadband includes a local oscillator. The local oscillator is connected with a mixer. The mixer is connected with a band-pass filter, a first amplifier and a first 40.68MHz filter. The first 40.68MHz filter is connected with a second amplifier and a third amplifier at the same time. The second amplifier and the third amplifier are both connected with a second 40.68MHz filter. The second 40.68MHz filter is also connected with a fourth amplifier. The band-pass filter is also connected with an attenuation network. The attenuation network is connected with an ALC circuit, an AGC circuit and a low-pass filter. According to the utility model, the intermediate frequency of the shortwave communication channel device for the broadband is far larger than 3KHz that is the intermediate frequency of a traditional shortwave communication system, the bandwidth is enlarged to 640KHz, so that the transmission rate is improved.
Description
Technical field
The utility model belongs to short wave communication device field, relates to a kind of short wave communication CU channel unit of broadband.
Background technology
For the arrowband Shortwave Communication System that traditional intermediate-frequency bandwidth is 3KHz, signal is affected by noise bigger, poor anti jamming capability, and when the short wave communication transmission rate was higher, its transmission rate waited the limitation of itself and the problem of existence also to show slowly.The short wave bandwidth communication technology has obtained rapid progress now, and the research of short wave bandwidth channel has important effect in the short wave communication technology.
Summary of the invention
The purpose of this utility model provides a kind of short wave communication CU channel unit of broadband, and for digital signal processing unit provides the arrowband short wave communication CU channel unit of an intermediate-frequency bandwidth much larger than traditional 3KHz, it is 640KHz that bandwidth is expanded, to improve transmission rate.
The technical scheme that the utility model adopts is, a kind of short wave communication CU channel unit of broadband, comprise local oscillator, local oscillator is connected with frequency mixer, frequency mixer is connected with band pass filter, first amplifier and a 46.08MHz filter, and a 46.08MHz filter is connected with the 3rd amplifier with second amplifier simultaneously, and second amplifier all is connected with the 2nd 46.08MHz filter with the 3rd amplifier, the 2nd 46.08MHz filter also is connected with the 4th amplifier
Band pass filter also is connected with attenuation network, and attenuation network is connected with alc circuit, agc circuit and low pass filter.
Characteristics of the present utility model also are,
Wherein local oscillator is connected by radio frequency cable with frequency mixer, connects by the signal of telecommunication between all the other modules.
The beneficial effects of the utility model are, the broadband short wave communication CU channel unit that an intermediate-frequency bandwidth is provided is 640KHz in order to improve transmission rate, is improved antijamming capability.
Description of drawings
Fig. 1 is the structural representation of the short wave communication CU channel unit in a kind of broadband of the utility model;
Fig. 2 is the fundamental diagram of the utility model device.
Among the figure, 1. local oscillator, 2. frequency mixer, 3. band pass filter, 4. first amplifier, 5. a 46.08MHz filter, 6. second amplifier, 7. the 3rd amplifier, 8. the 2nd 46.08MHz filter, 9. the 4th amplifier, 10.ALC circuit, 11.AGC circuit, 12. attenuation networks, 13. low pass filters.
Embodiment
The utility model provides a kind of short wave communication CU channel unit of broadband, as shown in Figure 1, comprise local oscillator 1, local oscillator 1 is connected with frequency mixer 2, frequency mixer 2 is connected with band pass filter 3, first amplifier 4 and a 46.08MHz filter 5, and a 46.08MHz filter 5 is connected with the 3rd amplifier 7 with second amplifier 6 simultaneously, and second amplifier 6 all is connected with the 2nd 46.08MHz filter 8 with the 3rd amplifier 7, the 2nd 46.08MHz filter 8 also is connected with the 4th amplifier 9
Wherein band pass filter 3 also is connected with attenuation network 12, and attenuation network 12 is connected with ALC circuit 10, agc circuit 11 and low pass filter 13.
The operation principle of device of the present utility model, as shown in Figure 2, when being in accepting state, being intended to receipts radiofrequency signal with filter unit input provides the intermediate-freuqncy signal in a broadband for business unit after through filtering, frequency conversion, amplification; When being in emission state, deliver to power amplifier unit as pumping signal after the intermediate-freuqncy signal that is intended to that business unit is imported is passed through filtering, frequency conversion, amplification, carry out power amplification; Device of the present utility model is connected with motherboard by the radio frequency socket of 17 cores, and wherein motherboard is the device power supply, and main control unit provides control signal by motherboard for device;
When being in accepting state, the receipts radiofrequency signal of coming from filter unit at first enters the local oscillation signal mixing that low pass filter 13, band pass filter 3 carry out producing with local oscillator 1 after the filtering and becomes intermediate-freuqncy signal (centre frequency 46.08MHz).Attenuation network 12 is by agc circuit 11 controls of business unit.Mixer output signal amplifies also by the two-stage intermediate-frequency filter through intermediate frequency, i.e. a 46.08MHz filter 5 and the 2nd 46.08MHz filter 8, and filtering goes out intermediate-freuqncy signal, amplifies through the 4th amplifier 9 again, exports to business unit at last.
When device of the present utility model is in accepting state, require under the situation of introducing the distortion minimum, the signal that receives to be converted into useful information.Noise and interference are the unwanted signals that influences receiver performance, and receiver output useful signal is greater than the unwanted signal certain power, namely satisfies minimum signal to noise ratio requirement.
Sensitivity is to guarantee that receiver output reaches the minimum power input value of minimum signal to noise ratio, and noise factor is the noise level of whole receiver system.The receive channel design needs to guarantee that noise, gain, sensitivity, Lin Dao suppress to satisfy system requirements.Receive channel noise cascaded computation formula is:
Wherein F is overall noise factor; F1......Fn is noise factors at different levels; G1......Gn-1 is nominal power gains at different levels.According to noise cascade formula as can be known, interchannel noise depends mainly on system front end, for the overall noise factor that makes receiver is little, requires the noise factor of prime little, gain is high.
When device of the present utility model is in emission state, 46.08MHz intermediate-freuqncy signal is exported from digital processing element, deliver to a 46.08MHz filter 5 by the 3rd amplifier 7, the one 46.08MHz filter 5 output signals are directly delivered to frequency mixer 2, the local oscillation signal mixing that produces with local oscillator 1 becomes radiofrequency signal 1.6MHz～29.9999MHz, the outer interference signal of band is filtered by low pass filter 13 and band pass filter 3, this dual stage filter by 1～25dB attenuator separately, this attenuator in transmission path by alc circuit 10 signal controlling of main control unit.Radiofrequency signal is amplified by little wide discharge road behind filter, PIN pipe attenuation network, transmit-receive switch, by delivering to power amplifier unit as pumping signal behind the low pass filter 13 filtering harmonic waves, carries out power amplification again.
When the utility model is in emission state, be that baseband signal is converted to radiofrequency signal, and be amplified to enough power emission that it is two important index of transmitter that transmitting power and neighboring trace suppress.The setting of transmitting power is relevant with the communication distance of system, modulation system, minimum signal to noise ratio, operational environment etc., the too for a short time requirement that does not reach lowest signal-to-noise of power, and power too senior general produces interference to neighboring trace.The nonlinear characteristic of transmitter will produce a lot of harmonic componentss, and the neighboring trace inhibition is the index to harmonic requirement, requires harmonic power less than useful channel power certain value
The AGC control signal of being come by business unit is divided two-way output after amplifying, the one tunnel is the gain that intermediate frequency AGC is used for controlling the amplifying circuit of band control band AGC control; Another road and reference voltage compare, the decay that its output control triode also produces radio frequency AGC signal controlling front end PIN pipe attenuation network.
The ALC control signal of being come by main control unit after amplifying, with reference voltage relatively, the decay that its output control triode also produces radio frequency ALC signal controlling front end PIN pipe attenuation network.
Local oscillator 1 is for Channel Elements provides local oscillation signal, local frequency scope: 47.68MHz～76.08MHz, local oscillation signal output amplitude: 〉=3dBm (load 50 Ω); Simultaneously for business unit provides work clock, clock signal output amplitude: 〉=800mv (load 1k Ω).
Local oscillator adopts the DDS+PLL scheme, mark output signal frequently enters the DDS chip as external clock, behind AD9951 Bei Pin ﹑ frequency division, export, after the filtering of output signal process low pass filter, send into the OSC input of phase lock circuitry LMX2301 as the reference signal, through the 1/R frequency division, the Fin pin of the frequency of oscillation input LMX2301 of resonant tank, through the 1/N frequency division, the output of two signal phase demodulations, output signal is converted to DC level behind pump circuit, controlled the resonance frequency of voltage controlled oscillator afterwards through loop filter filtering.Behind the loop-locking, local oscillation signal is exported from high-frequency socket through amplifying.Radio-frequency (RF) local oscillator adopts the ADF4360 series of products of AD I company, integrated VCO in this product sheet, and have lower phase noise, adopt the crystal oscillator of high stability in the circuit.
Device of the present utility model has following advantage and good effect:
1) wideband gain flatness
A. the influence of device amplitude-frequency characteristic
The broadband amplitude-frequency characteristic of components and parts is bases of radio-frequency front-end and channel bandwidth design, also is the factor that the wideband gain flatness is had the greatest impact.The gain of device or Insertion Loss be difficult to accomplish low side and high-end in full accord, therefore selected amplitude-frequency characteristic device preferably for use.
B. the influence of port standing wave and interstage matched
During actual the use, the port standing wave of device and interstage matched can exert an influence the flatness index of degraded channel to the energy transmission of broadband signal.When the relatively poor device cascade of port standing-wave ratio is used, might in link, form repeatedly emission concussion, further worsen flatness index.So avoiding the direct cascade of the bigger device of standing-wave ratio when principle designs uses.
C. structure tolerance is to the influence of flatness
This broadband system adopts the Surface Mount miniaturized device as far as possible, and device sinks to installing during use.For the pin type export structure, solder joint should be tried one's best near the root of little band pin during use.Effectively reduce structure tolerance to the influence of flatness.
2) spuious
All impossible generation is spuious in the passive device, and spuious is to produce in a transistor, and there namely have and only have " nonlinear device " to produce to be spuious, the spuious action that certainly exists " mixing ".Taked following measure in this device design:
A. to the Primary Component shielding, add filter capacitor, the phase demodulation frequency of change frequency synthesizer reduces spuious;
B. by adopting the method for PLL+DDS, improve spuious that frequency synthesizer brings;
C. by the abundant ground connection of AGC amplifier is solved self-excitation phenomena;
D. select the less device of noise factor for use, reduce the influence that noise brings channel.
Broadband short wave communication CU channel unit is made up of radiofrequency signal processing section, frequency synthesizer part two parts, and first position is that the conversion between intermediate-freuqncy signal and the radiofrequency signal is mainly realized in the radiofrequency signal processing section.Be that the narrow band channel of 3KHz is different with traditional intermediate-frequency bandwidth, this device is intended to provide for digital processing element the intermediate frequency wider passages of a 640KHz, so that its corresponding function is partly finished in digital processing.The radiofrequency signal processing section mainly is made up of circuit such as mixting circuit, intermediate frequency amplification, agc circuit, alc circuits.Second portion is the frequency synthesizer part, is mainly the radiofrequency signal processing section local oscillation signal is provided, local frequency scope: 47.68MHz～76.08MHz, local oscillation signal output amplitude: 〉=3dBm (load 50 Ω); For business unit provides work clock, clock frequency is 18.432MHz simultaneously, clock signal output amplitude: 〉=800mv (load 1k Ω).
The dependence test index of device of the present utility model:
1) receiving sensitivity: when receiving terminal is imported 1 μ V, the intermediate frequency signal to noise ratio〉14dB;
2) collection of letters road gain:〉70dB;
3) AGC control characteristic: 〉=80dB;
4) three dB bandwidth: 〉=640KHz;
5) send out output amplitude: 4～6dBm;
6) send out frequency response: be not more than 3dB;
7) send out spuious :≤-60dB;
8) ALC control range: 〉=25dB.
Device of the present utility model has selected to satisfy the element of system performance index by to each Circuit Optimization in the system.Can share other unit in radio station, the maturity height; Derive from the unit physical dimension in public former radio station fully, improved the reliability of newly grinding the radio station.
Claims (2)
1. the short wave communication CU channel unit in a broadband, it is characterized in that, comprise local oscillator (1), local oscillator (1) is connected with frequency mixer (2), frequency mixer (2) is connected with bandpass filter (3), the first amplifier (4) and a 46.08MHz wave filter (5), the one 46.08MHz wave filter (5) is connected with the 3rd amplifier (7) with the second amplifier (6) simultaneously, the second amplifier (6) all is connected with the 2nd 46.08MHz wave filter (8) with the 3rd amplifier (7), the 2nd 46.08MHz wave filter (8) also is connected with the 4th amplifier (9)
Described band pass filter (3) also is connected with attenuation network (12), and attenuation network (12) is connected with alc circuit (10), agc circuit (11) and low pass filter (13).
2. device according to claim 1 is characterized in that, described local oscillator (1) is connected by radio frequency cable with frequency mixer (2), connects by the signal of telecommunication between all the other modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207243509U CN203057131U (en) | 2012-12-25 | 2012-12-25 | Shortwave communication channel device for broadband |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207243509U CN203057131U (en) | 2012-12-25 | 2012-12-25 | Shortwave communication channel device for broadband |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057131U true CN203057131U (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012207243509U Expired - Lifetime CN203057131U (en) | 2012-12-25 | 2012-12-25 | Shortwave communication channel device for broadband |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057131U (en) |
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2012
- 2012-12-25 CN CN2012207243509U patent/CN203057131U/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130710 |