CN201160271Y - Quadrature detector for upgrade improvement of short wave simulation receiver - Google Patents
Quadrature detector for upgrade improvement of short wave simulation receiver Download PDFInfo
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- CN201160271Y CN201160271Y CNU2008200186053U CN200820018605U CN201160271Y CN 201160271 Y CN201160271 Y CN 201160271Y CN U2008200186053 U CNU2008200186053 U CN U2008200186053U CN 200820018605 U CN200820018605 U CN 200820018605U CN 201160271 Y CN201160271 Y CN 201160271Y
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- quadrature detector
- pulse
- integrator
- circuit
- analog receiver
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Abstract
The utility model relates to a quadrature detector for the upgrading to a short-wave analog receiver. The quadrature detector comprises an oscillator, a pulse generator circuit, a two-way analog switch, a dual-voltage follower, a dual integrator and a dual phase-reversing proportional amplifier; the quadrature detector is arranged between the short-wave analog receiver and a personal computer with sound card, thereby the upgrading to the short-wave analog receiver can be implemented. The utility model has advantages of novelty, simpleness, flexibleness and easy debugging, and which can change the upgrading mode of the prior analog receiver, thereby the performance of the analog receiver can be enhanced greatly.
Description
(1) technical field
The utility model relates to a kind of upgrading device of radio receiver, particularly a kind of quadrature detector that is used for short wave analog receiver upgrading.
(2) background technology
In the middle of short-wave reception equipment, the receiver (hereinafter to be referred as " analog machine ") of simulation standard still has very big owning amount in the middle of each relevant departments that comprises army, no committee at different levels, navigation, time service, meteorology, broadcasting etc.This part analog machine is realized based on hardware fully, and function singleness in the face of modern communication technology constantly develops all challenges (complicated more abominable channel circumstance, the new code modulation mode that emerges in an endless stream etc.) that proposed, seems unable to do what one wishes.And, because the restriction of various factorss such as the cycle of updating, fund is unlikely eliminated again at short notice fully.So, how to suit measures to local conditions they are transformed, make its development that adapts to the situation, have very realistic meanings.
Characteristics such as software and radio technique develops rapidly in recent years, and it is strong to have extensibility, agile and all-purpose have been represented the developing direction of radiotechnics.Traditional analog machine is carried out digital improvement, introduce software and radio technique, can increase substantially its performance, make it catch up with the paces of technical development.
For extracting lower " base band " signal of frequency in the middle of the intermediate-freuqncy signal of self simulation machine always, traditional frequency mixing method is that local oscillator produces the local oscillator output that equals the intermediate-freuqncy signal carrier frequency, through being transformed to the two-way orthogonal signalling that phase difference is 90 degree after the phase shifter, with the intermediate-freuqncy signal mixing, produce " and frequently " and " difference frequency " output respectively.The process low pass filter is crossed and is filtered after " and frequently " component, and " difference frequency " composition is required two-way " base band " signal.Though can realize " base band " signal extraction, this method circuit structure complexity, debug difficulties, because the harmonic components that the frequency mixer nonlinear effect produces is abundant, loss is big, thereby uses limited.
(3) summary of the invention
For overcoming the defective of prior art, the utility model provides a kind of quadrature detector that is used for short wave analog receiver upgrading.
A kind of quadrature detector that is used for short wave analog receiver upgrading, comprise oscillator, pulse-generating circuit, two-way analog switch, two voltage followers, two-integrator, two anti-phase proportional amplifiers, pulse-generating circuit is made up of D class trigger and logical circuit, it is characterized in that, oscillator is connected with pulse-generating circuit, the logic circuit output end of pulse-generating circuit is connected respectively to the control end of two-way analog switch, the output of two-way analog switch is connected respectively to the input of two voltage followers, two voltage follower outputs are connected to two-integrator respectively, the two-integrator back is connected with two anti-phase proportional amplifiers separately, and two anti-phase proportional amplifier outputs connect the output coupling circuit.
When the utility model uses, the medium frequency output end of short wave analog receiver is connected with the input of quadrature detector; The output of quadrature detector is connected with the linear input of the sound card of PC, after signal enters the sound card sampling, can carry out sequence of operations such as frequency spectrum demonstration, digital filtering, demodulation, de-noising by PC, realize upgrading short wave analog receiver.
The quadrature detector course of work in the utility model is: oscillator produces 4 times to the clock frequency of IF-FRE, and by its logical circuit output two-way sampling pulse (seeing the sampling pulse 4,5 among Fig. 2), pulse duration is T through pulse-generating circuit, and the cycle is T
0, and T
0(wherein T is the clock cycle to=4T, T
0Be the intermediate frequency cycle.), and the phase phasic difference 90 of two-way sampling pulse degree is controlled " closure " and " disconnection " (high level is " closure ", and low level is " disconnection ") of two-way analog switch respectively.The input of two analog switches receives the intermediate-freuqncy signal of being presented by the analog receiver coupling, by the output of two analog switches with carry out impedance conversion after two voltage followers are connected, enter two integrators again, get final product " extraction " and go out low frequency " base band " signal that sound card can be handled.The sound card of PC is a complete hardware system that comprises mould/number, D/A switch, digital signal processing chip, in order to " base band " signal is handled.The linear input port of sound card (Line In) receives two-way (R sound channel and L sound channel) stereophonic signal, in the present invention, and the corresponding two-way orthogonal signalling of using various software and radio techniques required (1 road and Q road) that receive.After I road and Q road " base band " signal enter the sound card sampling, can use the algorithm of handling quadrature " base band " signal to carry out calculation process, finish sequence of operations such as frequency spectrum demonstration, digital filtering, demodulation, de-noising.
The utility model is as follows by the principle that quadrature detector " extraction " goes out " base band " signal: the intermediate-freuqncy signal of establishing from analog machine is the carrier only of non-modulated, is that the cycle is T among Fig. 2
0Sine voltage signal 6.It is coupled to two-integrator by two-way analog switch, and then every way switch can allow the sinusoidal signal 6 in the T time to pass through.T is after the time for process, the two-way analog switch closure, and the two-integrator upper integral obtains the average voltage of sinusoidal signal in the T time, and keeps the unlatching moment of this magnitude of voltage to next two-way analog switch.Because the sampling pulse cycle equals the sinusoidal signal cycle, the average voltage that obtains on each as can be known two-integrator equates that promptly the two output voltage of two-integrator is constant.If keep two sampling pulse width T, period T
0Constant, the change sinusoidal signal cycle makes it equal T
0+ Δ T, then the output voltage on the two-integrator no longer is a steady state value, but changes with Δ T.From frequency-domain analysis, in the communication system, producing with the carrier wave after " base band " signal modulated carrier is the frequency spectrum of centre frequency, and the periodic increment Δ T in the promptly corresponding time domain this shows that the effect of two-integrator extracts " base band " signal just in the middle of intermediate-freuqncy signal.Simultaneously, because two- way sampling pulse 4,5 just differs 1/4 cycle of IF-FRE, i.e. phase phasic difference 90 degree, " base band " signal that two-integrator 10 extracts also should be the two paths of signals that phase difference is 90 degree mutually, be I road and Q road, be admitted to the linear input of sound card of PC respectively.
Than the upgrading method based on orthogonal mixer, beneficial effect is as follows based on the upgrading method of quadrature detector:
1. use the sampling pulse of phase phasic difference 90 degree to carry out " asynchronous " sampling, avoided orthogonal mixer to carry out the desired local oscillation signal phase-shift circuit of " synchronously " mixing; Use two-integrator to extract " base band " signal, saved frequency mixer and bigoted circuit thereof, so circuit structure is simplified greatly;
2. as a kind of " digital " wave detector, than analog frequency mixer, debug process is simplified greatly, does not need debugging just can to play a role by connecting system;
The output of frequency mixer comprise " and frequently ", " difference frequency " and various harmonic component and with, difference component, wherein only " difference frequency " component is effective, then Bao Shou loss is greater than 6dB; Quadrature detector is only exported " difference frequency " component, and then transition loss is very little, does not consider that device loss can reach 0.9dB;
4. owing to need not consider the nonlinear effect of frequency mixer, the dynamic range of quadrature detector is big, and distortion is little, can insert various types of analog machines, has wide range of applications;
Whole system platform novelty, simple, flexibly, debugging is convenient.Because popularizing rapidly of PC, the user can realize the upgrading of analog machine on the basis that increases any additional hardware investment hardly.
(4) description of drawings
Fig. 1 is that the utility model uses connection diagram, and Fig. 2 is quadrature detector sampling pulse sequential and sampling principle figure, and Fig. 3 is the utility model quadrature detector embodiment circuit diagram.
Wherein: 1. quadrature detector, 2. analog receiver, 3. PC (comprising sound card), 4,5. sampling pulse, 6. intermediate-freuqncy signal, 7. oscillator, 8. pulse-generating circuit, 9. two-way analog switch, 10. two-integrator, 11,15,16,19,21,24,27,28,29,34,42,43,50,51,52,53,57,58,60. electric capacity, 12,13,18,20,30,31,35,40,41,44,45,46,47. resistance, 14. crystal, 17. triode, 22,23.D the class trigger, 25,26. logical circuit, 32. analog receiver out splice going splice, 33. intermediate frequency transformer, 36,37. two-way analog switch, 38,39. two voltage followers, 48,49. two anti-phase proportional amplifiers, 54,55. audio frequency transformer, 56. two-way interfaces, 59 three-terminal voltage-stabilizing integrated packages, 61. from the intermediate frequency output signal of analog receiver, 62. " base band " signals after quadrature detector extracts.
(5) embodiment
Embodiment
The utility model uses and connects as shown in Figure 1, and the medium frequency output end of short wave analog receiver 2 is connected with the input of quadrature detector 1; The output of quadrature detector 1 is connected with the linear input of the sound card of PC 3, after signal enters the sound card sampling, can carry out sequence of operations such as frequency spectrum demonstration, digital filtering, demodulation, de-noising by PC 3, realize upgrading short wave analog receiver 2.
The embodiment of the utility model quadrature detector as shown in Figure 3, comprise oscillator 7, pulse-generating circuit 8, two-way analog switch 9, two voltage followers 38,39, two-integrator 10, two anti-phase proportional amplifiers 48,49, pulse-generating circuit 8 is by D class trigger 22,23 and logical circuit " with " door 25,26 form, oscillator 7 is connected with pulse-generating circuit 8, the logical circuit of pulse-generating circuit 8 " with " door 25,26 outputs are connected respectively to the control end of two-way analog switch 9, the output of two-way analog switch 9 is connected respectively to two voltage followers 38,39 input, two voltage followers 38,39 outputs are connected to two-integrator 10 respectively, two-integrator 10 back are connected with two anti-phase proportional amplifiers 48 separately, 49, two anti-phase proportional amplifiers 48,49 outputs connect the output coupling circuit.
Wherein: electric capacity 11,15,16,19, resistance 12,13,18,20, triode 17, crystal 14 is formed crystal oscillating circuit, produce 4 times to the clock frequency of IF-FRE, be coupled to D class trigger 22,23 through electric capacity 21, " with " 25,26 pulse-generating circuit of forming 8, control impuls produced; Two-way analog switch 9 comprises two analog switches 36,37 of separation, the state (high level is " closure ", and low level is " disconnection ") of the control impuls control analog switch 36,37 that pulse-generating circuit 8 produced.The intermediate-freuqncy signal that the coupling network that the input reception of analog switch 36,37 is made up of analog receiver out splice going splice 32, intermediate frequency transformer 33, electric capacity 34, resistance 35 is come from the analog machine coupling.The output of analog switch 36,37 is connected with the voltage follower 38,39 that high speed operation amplifier is formed, and carries out impedance conversion, enters by resistance 40,41 integrator that electric capacity 42,43 is formed again.
" base band " signal I road of being extracted by electric capacity 42,43 and Q road are via resistance 44,45,46,47, the anti-phase ratio amplifying circuit that amplifier 48,49 is formed is coupled to the linear input R of PC sound card, L interface by electric capacity 52,53 and audio frequency transformer 54,55.
Claims (1)
1. quadrature detector that is used for short wave analog receiver upgrading, comprise oscillator, pulse-generating circuit, two-way analog switch, two voltage followers, two-integrator, two anti-phase proportional amplifiers, pulse-generating circuit is made up of D class trigger and logical circuit, it is characterized in that, oscillator is connected with pulse-generating circuit, the logic circuit output end of pulse-generating circuit is connected respectively to the control end of two-way analog switch, the output of two-way analog switch is connected respectively to the input of two voltage followers, two voltage follower outputs are connected to two-integrator respectively, the two-integrator back is connected with two anti-phase proportional amplifiers separately, and two anti-phase proportional amplifier outputs connect the output coupling circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200186053U CN201160271Y (en) | 2008-03-10 | 2008-03-10 | Quadrature detector for upgrade improvement of short wave simulation receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200186053U CN201160271Y (en) | 2008-03-10 | 2008-03-10 | Quadrature detector for upgrade improvement of short wave simulation receiver |
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| CN201160271Y true CN201160271Y (en) | 2008-12-03 |
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| CNU2008200186053U Expired - Lifetime CN201160271Y (en) | 2008-03-10 | 2008-03-10 | Quadrature detector for upgrade improvement of short wave simulation receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272156B (en) * | 2008-03-10 | 2011-08-10 | 山东大学 | Short wave analog receiver upgrading method based on quadrature detector |
-
2008
- 2008-03-10 CN CNU2008200186053U patent/CN201160271Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272156B (en) * | 2008-03-10 | 2011-08-10 | 山东大学 | Short wave analog receiver upgrading method based on quadrature detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20081203 Effective date of abandoning: 20080310 |