CN106342408B - A kind of frequency conversion apparatus of dual-system and dual-frequency receiver and method thereof - Google Patents
A kind of frequency conversion apparatus of dual-system and dual-frequency receiver and method thereofInfo
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- CN106342408B CN106342408B CN200810077951.3A CN200810077951A CN106342408B CN 106342408 B CN106342408 B CN 106342408B CN 200810077951 A CN200810077951 A CN 200810077951A CN 106342408 B CN106342408 B CN 106342408B
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Abstract
The invention discloses a kind of frequency conversion apparatus and method of dual-system and dual-frequency receiver. Device can receive four radiofrequency signals of GPS and B2 system simultaneously. L1 and L2 use low-converter A (3) jointly, and B1 and B2 use down coversion B (4) jointly, carry out down coversion for the first time. The first intermediate-freuqncy signal of L1, L2, B1 and B2 is used respectively low-converter C (13), low-converter D (14), low-converter E (15) and low-converter F (16) to carry out down coversion for the second time and produces required intermediate-freuqncy signal; Signal all keeps the power of required intermediate-freuqncy signal constant by wave filter, automatic gain controller (26) and feedback control loop after each down coversion; The present invention has realized four radiofrequency signals that simultaneously receive BD2 and two systems of GPS, and be the intermediate-freuqncy signal needing by radiofrequency signal by two-stage frequency down-converts, and reduce the number of phaselocked loop in the frequency synthesizer (25) that produces local oscillation signal.
Description
Technical field
The present invention relates to a kind of frequency conversion apparatus from radio frequency to intermediate frequency and method thereof of receiver, particularly onePlant frequency conversion apparatus and the method thereof of dual-system and dual-frequency receiver.
Background technology
GLONASS (GNSS) refer to a kind of at least comprise one or more satellite navigation systems beSystem. The exemplary of present existing GNSS is: the global positioning system (GPS) of being founded by the U.S., and by frontGLONASS, the WAAS being founded by Japan and the Galileo being developed by European countries that the Soviet Union is founded. ButBecause these systems are founded and controlled by foreign country. If generation war, foreign country can close navigation system at any timeSystem, my army cannot be used these navigation system reliable locating information in the past, can make so for national defense safetyBecome very large threat and loss. Therefore the satellite navigation system Beidou satellite navigation system that has set up oneself is also seen by ChinaSystem. China, through examination transmitting and the operation of Big Dipper generation satellite, has embarked the Big Dipper two generations (BD2)Satellite navigation system: formed by navigation constellation, ground handling control and application three parts.
Receiver and for the frequency conversion method of receiver, has described receiver in 200410029554.0Be frequency conversion method and the structure of broad-frequency tuning device and receiver. This receiver comprises: received RF signalAntenna, low-noise amplifier, two or three frequency mixers and two or three local oscillators. AntennaReceive a radiofrequency signal, this signal is comprising the multiple channels that carry modulation information; Low-noise amplifier couplesTo antenna, in order to send out radiofrequency signal large; The first local oscillator is connected with the first frequency mixer, and is the first mixingDevice provides the first local oscillation signal; The second local oscillator is connected with the second frequency mixer, and provides for the second frequency mixerThe second local oscillation signal. This receiver becomes required by radiofrequency signal by two-stage down coversion or three grades of frequency down-convertsIntermediate-freuqncy signal. But, in such receiver and frequency conversion method thereof, no matter be two-stage down coversion or threeIn level down coversion, the required local oscillation signal of each frequency converter all needs different phaselocked loops, produces, so justIncrease the complexity of circuit and the power consumption of circuit, and be unfavorable for integrated. In this frequency conversion method, can onlyOne of them channel signals is changed simultaneously, and can not be changed the signal of multiple channels simultaneously.In addition, further say, this receiver and frequency conversion method thereof are mainly applicable to TV and radio receiverIn field, and can not be applied to satellite navigation receiver field.
Multiband RF (radio frequency) receiver, the multiband RF receiver of describing in 200810003546.7 canReceive the radiofrequency signal of gps system and the radiofrequency signal of Galileo. In this multiband RF receiver forThe part of frequency inverted comprises: the first radio frequency reception path, the second radio frequency reception path, phase coupler,Inter-stage wave filter, frequency translation unit, IF bandpass filter and variable gain amplifier. Wherein, first penetrateFrequently receiving path and the second radio frequency reception path can receive different radiofrequency signals, these two radio frequency reception pathsOutput be connected to phase coupler, radiofrequency signal is by entering by frequency translation unit after phase couplerLine frequency conversion process. Multiband RF receiver can receive different radiofrequency signals like this. But, multifrequencyThe first radio frequency reception path of section RF receiver and the second radio frequency reception path be mutual exclusion operate. Specifically,Be exactly that these two radio frequency reception paths can not be exported radiofrequency signal simultaneously, thus only can be from arbitrary logical at synchronizationRoad output radiofrequency signal. So much frequency range RF receiver can not receive different radiofrequency signals simultaneously, noCan carry out a series of application processing such as frequency inverted to different radiofrequency signals simultaneously.
Summary of the invention
The object of the invention is to provide a kind of frequency conversion apparatus and method thereof of dual-system and dual-frequency receiver, solvesCan not receive different radiofrequency signals simultaneously, can not carry out frequency inverted and every to different radiofrequency signals simultaneouslyA problem that the required local oscillation signal of frequency converter all needs different phaselocked loops to produce.
A kind of frequency conversion apparatus of dual-system and dual-frequency receiver comprises low-noise amplifier, low-converter, filteringDevice and frequency synthesizer; Also comprise power splitter, automatic gain controller and control signal generator. Wherein, underFrequency converter comprise low-converter A, low-converter B, low-converter C, low-converter D, low-converter E and underFrequency converter F; Wave filter comprises: wave filter A, wave filter B, wave filter C, filter D, wave filter E,Wave filter F, wave filter G and filters H; Automatic gain controller comprises: automatic gain controller A, fromMoving gain controller B, automatic gain controller C, automatic gain controller D, automatic gain controller E, fromMoving gain controller F, automatic gain controller G and automatic gain controller H.
The output of low-noise amplifier connects the input of power splitter. Power splitter has two outputs that are equal to,Be connected with the signal input part of low-converter B with low-converter A respectively. Low-converter A and low-converter BThere are respectively two outputs that are equal to. Signal output part of low-converter A and the input phase of wave filter AConnect, the output of wave filter A is connected with the signal input part of automatic gain controller A, automatic gain controllerThe output of A is connected with the input of low-converter C, the input of the output of low-converter C and wave filter EEnd is connected, and the output of wave filter E is connected with the signal input part of automatic gain controller E. Low-converter AAnother signal output part be connected with the input of wave filter B, the output of wave filter B and automatic gain controlThe signal input part of device B processed is connected, the input phase of the output of automatic gain controller B and low-converter DConnect, the output of low-converter D is connected with the input of wave filter F, the output of wave filter F and increasing automaticallyThe signal input part of benefit controller F is connected. Signal output part of low-converter B and the input of wave filter CEnd is connected, and the output of wave filter C is connected with the signal input part of automatic gain control C, automatic gain controlThe output of device C is connected with the input of low-converter E, and the output of low-converter E and wave filter G's is defeatedEnter end and be connected, the output of wave filter G is connected with the signal input part of automatic gain controller G. Low-converterAnother signal output part of B is connected with the input of filter D, the output of filter D and automatic gainThe signal input part of controller D is connected, the input of the output of automatic gain controller D and low-converter FBe connected, the output of low-converter F is connected with the input of filters H, and the output of filters H is with automaticThe signal input part of gain controller H is connected. Six local oscillation signal outputs of frequency synthesizer, respectively with underThe local oscillator of frequency converter A, low-converter B, low-converter C, low-converter D, frequency converter E and low-converter FSignal input part is connected. Eight gain control signal outputs of control signal generator, respectively with automatic gainController A, automatic gain controller B, automatic gain controller C, automatic gain controller D, automatic gainThe control letter of controller E, automatic gain controller F, automatic gain controller G and automatic gain controller HNumber input is connected.
A kind of dual system compatible receiver can receive four radiofrequency signals of GPS and two systems of BD2 simultaneously:
Gps system:
L1 radiofrequency signal (center carrier frequencies: 1575.42MHz, frequency bandwidth: ± 1.023MHz)
L2 radiofrequency signal (center carrier frequencies: 1227.6MHz, frequency bandwidth: ± 1.023MHz)
BD2 navigation system:
B1 radiofrequency signal (center carrier frequencies: 1561.098MHz, frequency bandwidth: ± 2.046MHz)
B2 radiofrequency signal (center carrier frequencies: 1207.14MHz, frequency bandwidth: ± 2.046MHz)
The L1 of gps system and L2 are in the time carrying out first order down coversion, by low-converter and the first local oscillation signalAfter mixing, produce the first intermediate-freuqncy signal of L1 and the first intermediate-freuqncy signal of L2.
The B1 of BD2 system and B2 are in the time carrying out first order down coversion, by low-converter and the second local oscillation signalAfter mixing, produce the first intermediate-freuqncy signal of B1 and the first intermediate-freuqncy signal of B2.
The L1 of gps system in the time carrying out second level down coversion, the first intermediate-freuqncy signal of L1 by low-converter andAfter the 3rd local oscillation signal mixing, produce the second intermediate-freuqncy signal of the L1 needing. Wherein, the 3rd local oscillation signalFrequency is the integral frequency divisioil of the first local oscillator signal frequency.
The L2 of gps system in the time carrying out second level down coversion, the first intermediate-freuqncy signal of L2 by low-converter andAfter the 4th local oscillation signal mixing, produce the second intermediate-freuqncy signal of the L2 needing.
The B1 of BD2 system in the time carrying out second level down coversion, the first intermediate-freuqncy signal of B1 by low-converter andAfter the 5th local oscillation signal mixing, produce the second intermediate-freuqncy signal of the B1 needing. Wherein, the 5th local oscillation signalFrequency is the integral frequency divisioil of the first local oscillator signal frequency.
The B2 of BD2 system in the time carrying out second level down coversion, the first intermediate-freuqncy signal of B2 by low-converter andAfter the 6th local oscillation signal mixing, produce the second intermediate-freuqncy signal of the B2 needing. Wherein, the 6th local oscillation signalFrequency is the integral frequency divisioil of the first local oscillator signal frequency.
A kind of concrete steps of frequency conversion method of dual-system and dual-frequency receiver are:
The first step: improve radiofrequency signal power, reduce noise.
The L1 (1575.42MHz) of gps system and L2 (1227.6MHz) radiofrequency signal and BD2 systemB1 (1561.098MHz) and B2 (1207.14MHz) radiofrequency signal are through low-noise amplifier, low noiseAmplifier has improved the power of four radiofrequency signals, can make up like this gain requirement of whole system, Er QiekeTo reduce the noise coefficient of whole system.
Second step: use power splitter Jiang Yi road circuit signal to be divided into two-way circuit signal.
Four radiofrequency signals are fed to power splitter after low-noise amplifier, power splitter Jiang Yi road circuit signalBe divided into a road circuit signal, the signal of each road circuit includes four radiofrequency signals.
The 3rd step: down coversion for the first time under four radiofrequency signals are carried out.
L1, L2, B1 and B2 are fed to low-converter A, and the local oscillator input signal of low-converter A is by frequentlyRate synthesizer produce the first local oscillation signal (1338MHz). L1, L2, B1 and B2 are through low-converterAfter A, produced respectively four intermediate-freuqncy signals, its frequency is respectively: 237.42MHz, 110.4MHz,223.098MHz and 130.86MHz. Wherein, frequency is that the intermediate-freuqncy signal of 237.42MHz and 110.4MHz is dividedBe not the first intermediate-freuqncy signal of L1 and the first intermediate-freuqncy signal of L2, these two signals are useful signals. And frequencyFor the intermediate-freuqncy signal of 223.098MHz and 130.86MHz is useless interfering signal.
L1, L2, B1 and B2 are fed to low-converter B, and the local oscillator input signal of low-converter B is by frequentlyThe second local oscillation signal (1326MHz) that rate synthesizer produces. L1, L2, B1 and B2 are through low-converter AAfter, producing respectively four intermediate-freuqncy signals, its frequency is respectively: 249.42MHz, 98.4MHz, 235.098MHzAnd 118.86MHz. Wherein, frequency is that the signal of 235.098MHz and 118.86MHz is respectively first of B1The first intermediate-freuqncy signal of intermediate-freuqncy signal and B2, these two signals are useful signals. And frequency be 249.42MHz,The signal of 98.4MHz is useless interfering signal.
The 4th step: signal is carried out to filtering, produce four the first intermediate-freuqncy signals.
L1, L2, B1 and B2 are sent to through four intermediate-freuqncy signals that produce after low-converter A simultaneouslyWave filter A and wave filter B carry out filtering.
Wave filter A is that a centre frequency is 237.42MHz, bandwidth is ± and the bandpass filter of 1.1MHz, mainSyllabus be the band stray signal of the first intermediate-freuqncy signal of filtering L1. Wave filter B is that a centre frequency is110.4MHz, bandwidth is ± bandpass filter of 1.1MHz, main purpose is the first intermediate-freuqncy signal of filtering L2Band stray signal.
These four intermediate-freuqncy signal signals after device A, only have the first intermediate-freuqncy signal of L1 after filtering(237.42MHz) can pass through wave filter A, other three signals are all by filtering. These four intermediate-freuqncy signal warpsAfter wave filter B, only have the first intermediate-freuqncy signal (110.4MHz) of L2 can pass through wave filter B, itsHis three signals are all by filtering.
By L1, L2, B1 and tetra-radiofrequency signals of B2, through four intermediate frequencies that produce after low-converter BSignal is sent to wave filter C simultaneously and filter D carries out filtering.
Wave filter C is that a centre frequency is 235.098MHz, bandwidth is ± and the bandpass filter of 2.1MHz,Main purpose is the band stray signal of the first intermediate-freuqncy signal of filtering B1. Filter D is a centre frequencyFor 118.86MHz, bandwidth is ± bandpass filter of 2.1MHz, main purpose is the first intermediate frequency of filtering B2The band stray signal of signal.
These four intermediate-freuqncy signals after device C, only have the first intermediate-freuqncy signal (235.098MHz) of B1 after filteringCan pass through wave filter C, other three signals are all by filtering. These four intermediate-freuqncy signals are after filtering after device D,Only have the first intermediate-freuqncy signal (118.86MHz) of B1 can pass through filter D, other three signals are all filteredRemove.
The 5th step: the power that regulates for the first time four the first intermediate-freuqncy signals.
Four the first intermediate-freuqncy signals of L1, L2, B1 and B2 are sent to respectively automatic increasing after device after filteringBenefit controller A, automatic gain controller B, automatic gain controller C and automatic gain controller D, to itPower regulates.
The effect of automatic gain controller is in the time that radiofrequency signal power changes, can be by feedback control loop controlSignal generator 26 processed produces gain control signal and regulates the gain size of automatic gain controller, thereby makesThe power of final the second intermediate-freuqncy signal producing remains unchanged.
Wherein, automatic gain controller A, automatic gain controller B, automatic gain controller C and increasing automaticallyThe control signal of benefit controller D is the gain control signal being produced by control signal generator.
The 6th step: four the first intermediate-freuqncy signals are carried out to down coversion.
Four the first intermediate-freuqncy signals of L1, L2, B1 and B2 are after filtering after device and automatic gain controller,Be fed to low-converter C, low-converter D, low-converter E and low-converter F and carry out down coversion, afterwardsProduce respectively the second intermediate-freuqncy signal (14.42MHz), the L2 of L1 the second intermediate-freuqncy signal (13.6MHz),The second intermediate-freuqncy signal (14.098MHz) of B1 and the second intermediate-freuqncy signal (13.74MHz) of B2.
Wherein, the local oscillator input signal of low-converter C be produced by frequency synthesizer the 3rd local oscillation signal(223MHz). The local oscillator input signal of low-converter D be produced by frequency synthesizer the 4th local oscillator believeNumber (124MHz). The local oscillator input signal of low-converter E be produced by frequency synthesizer the 5th local oscillator believeNumber (221MHz). The local oscillator input signal of low-converter F be produced by frequency synthesizer the 6th local oscillator believeNumber (132.6MHz).
The 7th step: four the second intermediate-freuqncy signals are carried out to filtering, meet the requirement of signal Out-of-band rejection.
The second intermediate-freuqncy signal (14.42MHz) of L1, the second intermediate-freuqncy signal (13.6MHz) of L2, B1'sThe second intermediate-freuqncy signal (13.74MHz) of the second intermediate-freuqncy signal (14.098MHz) and B2 is admitted to respectively filteringDevice E, wave filter F, wave filter G and filters H are carried out filtering, and main purpose is that the band that meets signal presses down outwardRequirement processed, the band stray signal of simultaneously all right filtering the second intermediate-freuqncy signal.
Wherein, wave filter E is that a centre frequency is 14.42MHz, bandwidth is ± and the logical filter of band of 1.0236MHzRipple device; Wave filter F is that a centre frequency is 13.6MHz, bandwidth is ± and the bandpass filter of 1.0236MHz;Wave filter G is that a centre frequency is 14.098MHz, bandwidth is ± and the bandpass filter of 2.046MHz; FilteringDevice H is that a centre frequency is 13.74MHz, bandwidth is ± and the bandpass filter of 2.046MHz.
The 8th step: again regulate the power of four the second intermediate-freuqncy signals, keep its power constant.
The second intermediate-freuqncy signal (14.42MHz) of L1, the second intermediate-freuqncy signal (13.6MHz) of L2, B1'sThe second intermediate-freuqncy signal (13.74MHz) of the second intermediate-freuqncy signal (14.098MHz) and B2 after filtering after,Be fed to respectively automatic gain controller E, automatic gain controller F, automatic gain controller G and automaticGain controller H, regulates its power.
The effect of automatic gain controller is in the time that radiofrequency signal power changes, can be by feedback control loop controlSignal generator processed produces gain control signal and regulates the gain size of automatic gain controller, thereby makes finalThe power of the second intermediate-freuqncy signal producing remains unchanged.
Wherein, automatic gain controller E, automatic gain controller F, automatic gain controller G and increasing automaticallyThe control signal of benefit controller H is the gain control signal being produced by control signal generator; So far, realizedReceive four radiofrequency signals of GPS and B2 system simultaneously, and these four radiofrequency signals are converted to four of needsIndividual intermediate-freuqncy signal.
The advantage of the inventive method is:
1) receiver can receive simultaneously two systems of BD2/GPS four radiofrequency signal L1, L2, B1 andB2, and be converted into the intermediate-freuqncy signal needing. Receiver not only can choice and operation optimum data like this,Can effectively improve navigator fix reliability and precision, though also simultaneously can solve receiver at triangular web by peopleIn situation about disturbing or close, also can ensure the normal work of receiver system.
2) two of gps system radiofrequency signal L1 and L2, in the time of down coversion for the first time, use same jointlyLow-converter, that is to say, the L1 of gps system and L2, in the time carrying out first order down coversion, use jointlyOne local oscillation signal. The uniformity that can keep like this L1 and two signal frequency translated channels of L2, improves wholeThe precision of receiver system, has also reduced the number that uses phaselocked loop.
3) two of BD2 system radiofrequency signal B1 and B2, in the time of down coversion for the first time, use same jointlyLow-converter, that is to say, the B1 of BD2 system and B2, in the time carrying out first order down coversion, use jointlyTwo local oscillation signals. The uniformity that can keep like this B1 and two signal frequency translated channels of B2, improves wholeThe precision of receiver system, has also reduced the number that uses phaselocked loop.
4) L1 of gps system is in the time carrying out second level down coversion, and the 3rd local oscillation signal using is by firstLocal oscillation signal integral frequency divisioil gained; The B1 of BD2 system in the time carrying out second level down coversion, use the 5thLocal oscillation signal is by the second local oscillation signal integral frequency divisioil gained; The B2 of BD2 system is carrying out second level down coversionTime, the 6th local oscillation signal using is by the second local oscillation signal integral frequency divisioil gained; In actual circuit,Frequency dividing circuit is easy to realize than frequency multiplier circuit, and circuit is simple, low in energy consumption; Simultaneously by the basis having producedThe signal that shakes carries out frequency division and obtains needed local oscillation signal, can reduce the phaselocked loop for generating local oscillation signalNumber, complexity, volume and the power consumption of reduction circuit.
Brief description of the drawings
The frequency conversion apparatus composition schematic diagram of a kind of dual-system and dual-frequency receiver of Fig. 1.
1. low-noise amplifier 2. power splitter 3. low-converter A 4. low-converter B 5. wave filter A 6. filterRipple device B 7. wave filter C 8. filter D 9. automatic gain controller A 10. automatic gain controller B11. automatic gain controller C 12. automatic gain controller C 13. low-converter C 14. low-converter D15. low-converter E 16. low-converter F 17. wave filter E 18. wave filter F 19. wave filter G 20.Filters H 21. automatic gain controller E 22. automatic gain controller F 23. automatic gain controllersG 24. automatic gain controller H 25. frequency synthesizer 26. control signal generators
Detailed description of the invention
A kind of frequency conversion apparatus of dual-system and dual-frequency receiver comprises low-noise amplifier 1, low-converter, filterRipple device and frequency synthesizer 25; Also comprise power splitter 2, automatic gain controller and control signal generator 26.Wherein, low-converter comprise low-converter A3, low-converter B4, low-converter C13, low-converter D14,Low-converter E15 and low-converter F16; Wave filter comprise wave filter A5, wave filter B6, wave filter C7,Filter D 8, wave filter E17, wave filter F18, wave filter G19 and filters H 20; Automatic gain controlDevice comprises automatic gain controller A9, automatic gain controller B10, automatic gain controller C11, automatically increasesBenefit controller D12, automatic gain controller E21, automatic gain controller F22, automatic gain controller G23With automatic gain controller H24.
The output of low-noise amplifier 1 connects the input of power splitter 2. Power splitter 2 has two be equal to defeatedGo out end, be connected with the signal input part of low-converter B4 with low-converter A3 respectively. Low-converter A3 and underFrequency converter B 4 has respectively two outputs that are equal to. Signal output part of low-converter A3 and wave filterThe input of A5 is connected, and the output of wave filter A5 is connected with the signal input part of automatic gain controller A9,The output of automatic gain controller A9 is connected with the input of low-converter C13, and low-converter C13's is defeatedGo out end and be connected with the input of wave filter E17, the output of wave filter E17 and automatic gain controller E21Signal input part be connected. Another signal output part of low-converter A3 is connected with the input of wave filter B6,The output of wave filter B6 is connected with the signal input part of automatic gain controller B10, automatic gain controllerThe output of B10 is connected with the input of low-converter D14, the output of low-converter D14 and wave filter F18Input be connected, the output of wave filter F18 is connected with the signal input part of automatic gain controller F22.A signal output part of low-converter B4 is connected with the input of wave filter C7, the output of wave filter C7Be connected with the signal input part of automatic gain controller C11, the output of automatic gain controller C11 and lower changeFrequently the input of device E15 is connected, and the output of low-converter E15 is connected with the input of wave filter G19, filterThe output of ripple device G19 is connected with the signal input part of automatic gain control G23. Another of low-converter B4Individual signal output part is connected with the input of filter D 8, the output of filter D 8 and automatic gain controllerThe signal input part of D12 is connected, the input of the output of automatic gain controller D12 and low-converter F16Be connected, the output of low-converter F16 is connected with the input of filters H 20, the output of filters H 20Be connected with the signal input part of automatic gain control H24. Six local oscillation signal outputs of frequency synthesizer 25,Respectively with low-converter A3, low-converter B4, low-converter C13, low-converter D14, low-converter E15Be connected with the local oscillation signal input of low-converter F16. Letter is controlled in eight gains of control signal generator 26Number output, respectively with automatic gain controller A9, automatic gain controller B10, automatic gain controllerC11, automatic gain controller D12, automatic gain controller E21, automatic gain controller F22, increasing automaticallyThe control signal input of benefit controller G23 and automatic gain controller H24 is connected.
A kind of concrete steps of frequency conversion method of dual-system and dual-frequency receiver are:
The first step: improve radiofrequency signal power, reduce noise.
The L1 (1575.42MHz) of gps system and L2 (1227.6MHz) radiofrequency signal and BD2 systemB1 (1561.098MHz) and B2 (1207.14MHz) radiofrequency signal are through low-noise amplifier 1, low noiseAmplifier 1 has improved the power of four radiofrequency signals, can make up like this gain requirement of whole system, andCan reduce the noise coefficient of whole system.
Second step: use power splitter Jiang Yi road circuit signal to be divided into two-way circuit signal.
Four radiofrequency signals are fed to power splitter 2 after low-noise amplifier 1, power splitter 2 Jiang Yi road electricityRoad signal is divided into a road circuit signal, and the signal of each road circuit includes four radiofrequency signals.
The 3rd step: down coversion for the first time under four radiofrequency signals are carried out.
L1, L2, B1 and B2 are fed to low-converter A3, the local oscillator input signal of low-converter A3 be byThe first local oscillation signal (1338MHz) that frequency synthesizer 25 produces. L1, L2, B1 and B2 are through lower changeFrequently after device A3, produced respectively four intermediate-freuqncy signals, its frequency is respectively: 237.42MHz, 110.4MHz,223.098MHz and 130.86MHz. Wherein, frequency is that the intermediate-freuqncy signal of 237.42MHz and 110.4MHz is dividedBe not the first intermediate-freuqncy signal of L1 and the first intermediate-freuqncy signal of L2, these two signals are useful signals.
L1, L2, B1 and B2 are fed to low-converter B4, the local oscillator input signal of low-converter B4 be byThe second local oscillation signal (1326MHz) that frequency synthesizer 25 produces. L1, L2, B1 and B2 are through lower changeFrequently after device B4, produced respectively four intermediate-freuqncy signals, its frequency is respectively: 249.42MHz, 98.4MHz,235.098MHz and 118.86MHz. Wherein, frequency is the signal difference of 235.098MHz and 118.86MHzBe the first intermediate-freuqncy signal of B1 and the first intermediate-freuqncy signal of B2, these two signals are useful signals.
The 4th step: signal is carried out to filtering, produce four the first intermediate-freuqncy signals.
L1, L2, B1 and B2 are sent into through four intermediate-freuqncy signals that produce after low-converter A5 simultaneouslyCarry out filtering to wave filter A5 and wave filter B6.
Wave filter A5 is that a centre frequency is 237.42MHz, bandwidth is ± and the bandpass filter of 1.1MHz,Main purpose is the band stray signal of the first intermediate-freuqncy signal of filtering L1. Wave filter B6 is a centre frequencyFor 110.4MHz, bandwidth is ± bandpass filter of 1.1MHz, main purpose is the first intermediate frequency letter of filtering L2Number band stray signal.
These four intermediate-freuqncy signal signals after device A5, only have the first intermediate-freuqncy signal of L1 after filtering(237.42MHz) can pass through wave filter A5, other three signals are all by filtering. These four intermediate-freuqncy signal warpsAfter wave filter B6, only have the first intermediate-freuqncy signal (110.4MHz) of L2 can pass through wave filter B6,Other three signals are all by filtering.
By L1, L2, B1 and tetra-radiofrequency signals of B2, in produce after low-converter B4 fourFrequency signal is sent to wave filter C7 simultaneously and filter D 8 carries out filtering.
Wave filter C7 is that a centre frequency is 235.098MHz, bandwidth is ± and the bandpass filter of 2.1MHz,Main purpose is the band stray signal of the first intermediate-freuqncy signal of filtering B1. Filter D 8 is centre frequenciesFor 118.86MHz, bandwidth is ± bandpass filter of 2.1MHz, main purpose is the first intermediate frequency of filtering B2The band stray signal of signal.
These four intermediate-freuqncy signals after device C7, only have the first intermediate-freuqncy signal (235.098MHz) of B1 after filteringCan pass through wave filter C7, other three signals are all by filtering. These four intermediate-freuqncy signals after filtering device D8 itAfter, only have the first intermediate-freuqncy signal (118.86MHz) of B1 can pass through filter D 8, other three signalsAll by filtering.
The 5th step: the power that regulates for the first time four the first intermediate-freuqncy signals.
Four the first intermediate-freuqncy signals of L1, L2, B1 and B2 are sent to respectively automatic increasing after device after filteringBenefit controller A9, automatic gain controller B10, automatic gain controller C11 and automatic gain controller D12,Its power is regulated.
The effect of automatic gain controller is in the time that radiofrequency signal power changes, can be by feedback control loop controlSignal generator 26 processed produces gain control signal and regulates the gain size of automatic gain controller, thereby makesThe power of final the second intermediate-freuqncy signal producing remains unchanged.
Wherein, automatic gain controller A9, automatic gain controller B10, automatic gain controller C11 and fromThe control signal of moving gain controller D12 is the gain control signal being produced by control signal generator 26.
The 6th step: four the first intermediate-freuqncy signals are carried out to down coversion.
Four the first intermediate-freuqncy signals of L1, L2, B1 and B2 are after filtering after device and automatic gain controller,Be fed to low-converter C13, low-converter D14, low-converter E15 and low-converter F16 and carry out lower changeFrequently, produce respectively afterwards the second intermediate-freuqncy signal (14.42MHz), the L2 of L1 the second intermediate-freuqncy signal (13.6MHz),The second intermediate-freuqncy signal (14.098MHz) of B1 and the second intermediate-freuqncy signal (13.74MHz) of B2.
Wherein, the local oscillator input signal of low-converter C13 be produced by frequency synthesizer 25 the 3rd local oscillatorSignal (223MHz). The local oscillator input signal of low-converter D14 be produced by frequency synthesizer 25Four local oscillation signals (124MHz). The local oscillator input signal of low-converter E15 is to be produced by frequency synthesizer 25The 5th local oscillation signal (221MHz). The local oscillator input signal of low-converter F16 is by frequency synthesizer25 produce the 6th local oscillation signal (132.6MHz).
The 7th step: four the second intermediate-freuqncy signals are carried out to filtering, meet the requirement of signal Out-of-band rejection.
The second intermediate-freuqncy signal (14.42MHz) of L1, the second intermediate-freuqncy signal (13.6MHz) of L2, B1'sThe second intermediate-freuqncy signal (13.74MHz) of the second intermediate-freuqncy signal (14.098MHz) and B2 is admitted to respectively filteringDevice E17, wave filter F18, wave filter G19 and filters H 20 are carried out filtering, and main purpose is to meet signalOut-of-band rejection requirement, band stray signal that simultaneously can also filtering the second intermediate-freuqncy signal.
Wherein, wave filter E17 is that a centre frequency is 14.42MHz, and bandwidth is ± and the band of 1.0236MHz is logicalWave filter; Wave filter F18 is that a centre frequency is 13.6MHz, bandwidth is ± and the logical filter of band of 1.0236MHzRipple device; Wave filter G19 is that a centre frequency is 14.098MHz, bandwidth is ± and the bandpass filtering of 2.046MHzDevice; Filters H 20 is that a centre frequency is 13.74MHz, bandwidth is ± and the bandpass filter of 2.046MHz.
The 8th step: again regulate the power of four the second intermediate-freuqncy signals, keep its power constant.
The second intermediate-freuqncy signal (14.42MHz) of L1, the second intermediate-freuqncy signal (13.6MHz) of L2, B1'sThe second intermediate-freuqncy signal (13.74MHz) of the second intermediate-freuqncy signal (14.098MHz) and B2 after filtering after,Be fed to respectively automatic gain controller E21, automatic gain controller F22, automatic gain controller G23With automatic gain controller H24, its power is regulated.
The effect of automatic gain controller is in the time that radiofrequency signal power changes, can be by feedback control loop controlSignal generator 26 processed produces gain control signal and regulates the gain size of automatic gain controller, thereby makesThe power of final the second intermediate-freuqncy signal producing remains unchanged.
Wherein, automatic gain controller E21, automatic gain controller F22, automatic gain controller G23 andThe control signal of automatic gain controller H24 is the gain control signal being produced by control signal generator 26;So far, realized four radiofrequency signals that simultaneously receive GPS and B2 system, and these four radiofrequency signals have been turnedBe changed to four intermediate-freuqncy signals that need.
Claims (2)
1. a frequency conversion apparatus for dual-system and dual-frequency receiver, comprising: low-noise amplifier (1), underFrequency converter, wave filter and frequency synthesizer (25); Characterized by further comprising: power splitter (2), automaticGain controller and control signal generator (26); Wherein, low-converter comprises: low-converter A (3),Low-converter B (4), low-converter C (13), low-converter D (14), low-converter E (15) andLow-converter F (16); Wave filter comprises: wave filter A (5), wave filter B (6), wave filter C (7),Filter D (8), wave filter E (17), wave filter F (18), wave filter G (19) and filters H(20); Automatic gain controller comprises: automatic gain controller A (9), automatic gain controller B (10),Automatic gain controller C (11), automatic gain controller D (12), automatic gain controller E (21),Automatic gain controller F (22), automatic gain controller G (23) and automatic gain controller H (24);The output of low-noise amplifier (1) connects the input of power splitter (2); Power splitter (2) has two etc.Same output, is connected with the signal input part of low-converter B (4) with low-converter A (3) respectively; UnderFrequency converter A (3) and low-converter B (4) have respectively two outputs that are equal to; Low-converter A's (3)A signal output part is connected with the input of wave filter A (5), and the output of wave filter A (5) is with automaticThe signal input part of gain controller A (9) is connected, the output of automatic gain controller A (9) and lower changeFrequently the input of device C (13) is connected, and the output of low-converter C (13) and wave filter E's (17) is defeatedEnter end and be connected, the signal input part phase of the output of wave filter E (17) and automatic gain controller E (21)Connect; Another signal output part of low-converter A (3) is connected with the input of wave filter B (6), filteringThe output of device B (6) is connected with the signal input part of automatic gain controller B (10), automatic gain controlThe output of device B (10) is connected with the input of low-converter D (14), and low-converter D's (14) is defeatedGo out end and be connected with the input of wave filter F (18), the output of wave filter F (18) and automatic gain controlThe signal input part of device F (22) is connected; Signal output part of low-converter B (4) and wave filter C (7)Input be connected, the signal input part of the output of wave filter C (7) and automatic gain controller C (11)Be connected, the output of automatic gain controller C (11) is connected with the input of low-converter E (15), underThe output of frequency converter E (15) is connected with the input of wave filter G (19), and wave filter G's (19) is defeatedGoing out end is connected with the signal input part of automatic gain control G (23); Another signal of low-converter B (4)Output is connected with the input of filter D (8), the output of filter D (8) and automatic gain controlThe signal input part of device D (12) is connected, the output of automatic gain controller D (12) and low-converter F(16) input is connected, the input phase of the output of low-converter F (16) and filters H (20)Connect, the output of filters H (20) is connected with the signal input part of automatic gain control H (24); FrequencySix local oscillation signal outputs of synthesizer (25), respectively with low-converter A (3), low-converter B (4),Low-converter C (13), low-converter D (14), low-converter E (15) and low-converter F's (16)Local oscillation signal input is connected; Eight gain control signal outputs of control signal generator (26), respectivelyWith automatic gain controller A (9), automatic gain controller B (10), automatic gain controller C (11),Automatic gain controller D (12), automatic gain controller E (21), automatic gain controller F (22),Automatic gain controller G (23) is connected with the control signal input of automatic gain controller H (24).
2. a frequency conversion method for dual-system and dual-frequency receiver, is characterized in that the concrete steps of the methodFor:
The first step: improve radiofrequency signal power, reduce noise;
L1 1575.42MHz and the L2 of gps system, the B1 of 1227.6 MHz radiofrequency signals and BD2 system1561.098MHz and B2 1207.14 MHz radiofrequency signals are through low-noise amplifier (1), and four radio frequencies are believedNumber power improved, reduced the noise coefficient of whole system;
Second step: use power splitter Jiang Yi road circuit signal to be divided into two-way circuit signal;
Four radiofrequency signals are fed to power splitter (2), power splitter (2) after low-noise amplifier (1)Jiang Yi road circuit signal is divided into a road circuit signal, and the signal of each road circuit includes four radiofrequency signals;
The 3rd step: four radiofrequency signals are carried out to down coversion for the first time;
L1, L2, B1 and B2 are fed to low-converter A (3), the local oscillator input of low-converter A (3)Signal is the first local oscillation signal 1338 MHz that produced by frequency synthesizer (25); L1, L2, B1 and B2After frequency converter A (3), produce respectively four intermediate-freuqncy signals, its frequency is respectively: 237.42MHz,110.4MHz, 223.098MHz and 130.86MHz; Wherein, frequency is 237.42MHz and 110.4MHzIntermediate-freuqncy signal is respectively the first intermediate-freuqncy signal of L1 and the first intermediate-freuqncy signal of L2, and these two signals are useful lettersNumber;
L1, L2, B1 and B2 are fed to low-converter B (4), the local oscillator input of low-converter B (4)Signal is the second local oscillation signal 1326 MHz that produced by frequency synthesizer (25); L1, L2, B1 and B2After frequency converter B 4, produce respectively four intermediate-freuqncy signals, its frequency is respectively: 249.42MHz,98.4MHz, 235.098MHz and 118.86MHz; Wherein, frequency is 235.098MHz and 118.86MHzSignal be respectively the first intermediate-freuqncy signal of B1 and the first intermediate-freuqncy signal of B2, these two signals are useful signals;
The 4th step: signal is carried out to filtering, produce four the first intermediate-freuqncy signals;
Four intermediate-freuqncy signals that L1, L2, B1 and B2 are produced afterwards through low-converter A (5) simultaneouslyBe sent to wave filter A (5) and wave filter B (6) carries out filtering;
These four intermediate-freuqncy signals after filtering device A (5) afterwards, only have the first intermediate-freuqncy signal 237.42MHz of L1Can pass through wave filter A (5), other three signals are all by filtering; These four intermediate-freuqncy signals device B after filtering(6) afterwards, only have the first intermediate-freuqncy signal 110.4MHz of L2 can pass through wave filter B (6), other are three years oldIndividual signal is all by filtering;
By L1, L2, B1 and tetra-radiofrequency signals of B2, through low-converter B (4) produced afterwards fourIndividual intermediate-freuqncy signal is sent to wave filter C (7) simultaneously and filter D (8) carries out filtering;
These four intermediate-freuqncy signals after filtering device C (7) afterwards, only have the first intermediate-freuqncy signal 235.098MHz of B1Can pass through wave filter C (7), other three signals are all by filtering; These four intermediate-freuqncy signals device D after filtering(8) afterwards, only have the first intermediate-freuqncy signal 118.86MHz of B1 can pass through filter D (8), otherThree signals are all by filtering;
The 5th step: the power that regulates for the first time four the first intermediate-freuqncy signals;
Four the first intermediate-freuqncy signals of L1, L2, B1 and B2 are sent to respectively automatic increasing after device after filteringBenefit controller A (9), automatic gain controller B (10), automatic gain controller C (11) and increasing automaticallyBenefit controller D (12), regulates its power;
Wherein, automatic gain controller A (9), automatic gain controller B (10), automatic gain controllerThe control signal of C (11) and automatic gain controller D (12) is to be produced by control signal generator (26)Gain control signal;
The 6th step: four the first intermediate-freuqncy signals are carried out to down coversion;
Four the first intermediate-freuqncy signals of L1, L2, B1 and B2 are after filtering after device and automatic gain controller,Be fed to low-converter C (13), low-converter D (14), low-converter E (15) and low-converter F(16) carry out down coversion, produce respectively afterwards the second intermediate-freuqncy signal 14.42MHz of L1, the second intermediate frequency of L2The second intermediate-freuqncy signal 14.098MHz of signal 13.6MHz, B1 and the second intermediate-freuqncy signal 13.74MHz of B2;
Wherein, the local oscillator input signal of low-converter C (13) be produced by frequency synthesizer (25) theThree local oscillation signal 223 MHz; The local oscillator input signal of low-converter D (14) is by frequency synthesizer (25)Produce the 4th local oscillation signal 124MHz; The local oscillator input signal of low-converter E (15) is by frequency synthesisDevice (25) produce the 5th local oscillation signal 221MHz; The local oscillator input signal of low-converter F (16) be byFrequency synthesizer (25) produce the 6th local oscillation signal 132.6MHz;
The 7th step; Four the second intermediate-freuqncy signals are carried out to filtering, meet the requirement of signal Out-of-band rejection;
The second intermediate-freuqncy signal 13.6MHz of the second intermediate-freuqncy signal 14.42MHz, the L2 of L1, the second intermediate frequency of B1The second intermediate-freuqncy signal 13.74MHz of signal 14.098MHz and B2 is admitted to respectively wave filter E (17), filterRipple device F (18), wave filter G (19) and filters H (20) are carried out filtering, and main purpose is to meet letterNumber Out-of-band rejection requirement, band stray signal that simultaneously can also filtering the second intermediate-freuqncy signal;
Wherein, wave filter E (17) is that a centre frequency is 14.42MHz, bandwidth is ± 1.0236MHzBandpass filter; Wave filter F (18) is that a centre frequency is 13.6MHz, and bandwidth is ± 1.0236MHzBandpass filter; Wave filter G (19) is that a centre frequency is 14.098MHz, and bandwidth is ± 2.046MHzBandpass filter; Filters H (20) is that a centre frequency is 13.74MHz, and bandwidth is ± 2.046MHzBandpass filter;
The 8th step: again regulate the power of four the second intermediate-freuqncy signals, keep its power constant;
The second intermediate-freuqncy signal 13.6MHz of the second intermediate-freuqncy signal 14.42MHz, the L2 of L1, the second intermediate frequency of B1The second intermediate-freuqncy signal 13.74MHz of signal 14.098MHz and B2 after filtering after, be fed to respectively fromMoving gain controller E (21), automatic gain controller F (22), automatic gain controller G (23) andAutomatic gain controller H (24), regulates its power;
Wherein, automatic gain controller E (21), automatic gain controller F (22), automatic gain controlThe control signal of device G (23) and automatic gain controller H (24) is to be produced by control signal generator (26)Raw gain control signal; So far, realized four radiofrequency signals that simultaneously receive GPS and B2 system, andThese four radiofrequency signals are converted to four intermediate-freuqncy signals that need.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907962A (en) * | 2019-12-16 | 2020-03-24 | 重庆西南集成电路设计有限责任公司 | Beidou double-frequency satellite signal radio frequency receiver |
| CN111726132A (en) * | 2019-03-20 | 2020-09-29 | 博通集成电路（上海）股份有限公司 | RF front-end circuit of receiver and method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726132A (en) * | 2019-03-20 | 2020-09-29 | 博通集成电路（上海）股份有限公司 | RF front-end circuit of receiver and method thereof |
| CN111726132B (en) * | 2019-03-20 | 2022-03-08 | 博通集成电路（上海）股份有限公司 | RF front-end circuit of receiver and method thereof |
| CN110907962A (en) * | 2019-12-16 | 2020-03-24 | 重庆西南集成电路设计有限责任公司 | Beidou double-frequency satellite signal radio frequency receiver |
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