CN102540204A - Single-chip dual-frequency global satellite navigation receiver - Google Patents
Single-chip dual-frequency global satellite navigation receiver Download PDFInfo
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- CN102540204A CN102540204A CN2010106209370A CN201010620937A CN102540204A CN 102540204 A CN102540204 A CN 102540204A CN 2010106209370 A CN2010106209370 A CN 2010106209370A CN 201010620937 A CN201010620937 A CN 201010620937A CN 102540204 A CN102540204 A CN 102540204A
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Abstract
The invention discloses a single-chip dual-frequency global satellite navigation receiver. A global satellite navigation signal is divided into two frequency intervals of complementary angle image signals, two receiving channels on the same chip respectively receive global satellite navigation signals of each frequency interval, and the two receiving channels share two same frequency synthesizers for simultaneously receiving dual-frequency satellite navigation signals. The whole receiver comprises two configurable receiving channels and a baseband processing module, and the two receiving channels have the same circuit structure. Each independent configurable receiving channel comprises two stages of modules and can realize four receiving modes. Various modes of configuration of the receiver are completed through a digital interface 418 of an on-chip integrated SPI (Serial Peripheral Interface). A signal path of each receiving channel and a function of a configurable filter 411 module are configured through the digital interface of the SPI, and configuration of different wave bands of global satellite navigation signals is realized through changing output frequencies of the two frequency synthesizers. The receiver can work in four receiving modes.
Description
Technical field
The present invention relates to wireless communication electronics circuit engineering field, relate to the dual frequency global satellite navigation receiver, relate in particular to a kind of single-chip dual frequency global satellite navigation receiver, be applied to receive the single-chip dual-frequency receiver of global navigation satellite signal.
Background technology
Global navigation satellite positioning system GNSS be a kind of with the transit satellite be the basis radio navigation system; Can broadcast high precision, round-the-clock, round-the-clock navigation, location and time service information, be a kind of the army and the people user's Sharing Information resource that supplies the aeroamphibious field.The appearance of satellite navigation system has solved on a large scale, the global and high precision problem of location fast, is applied to military domain, location and navigation signal mainly is provided, for power-driven tools such as car, ship, aircraft provide navigator fix information and precise guidance; For field operations or maneuver warfare army provide positioning service; For the rescue personnel guides direction.The global navigation satellite positioning system has huge use potentiality; Its range of application expands to civilian; Infiltrate into national economy all departments, comprise oil development in marine and the desert, traffic administration, electric power transfer, resource investigation, disaster monitoring, public safety, relief, individual mobile phone location, commercial logistics management, fish production, civil engineering, archaeology etc.Satellite navigation system has become the spatial information infrastructure of digital earth, digital city.
At present, have in the GNSS system that builds and move: the Galileo system in GPS of USA system, Muscovite GLONASS system, Europe and the Big Dipper two generations (BEIDOU) system of China.In the five-year, several big systems also will be developed rapidly, and the global navigation satellite service can both be provided.Till that time, GNSS satellite number will be above 100, and each satellite navigation system envelop of function can both realize basically that navigation signal is covering the whole world.
Along with the expansion of global navigation satellite positioning system application and the extension of function, also increasingly high to the requirement of GNSS receiver bearing accuracy.With example, adopt the single-frequency GPS receiver bearing accuracy limited with the GPS receiver, when dot spacing left above 20～30Km, bearing accuracy received the restriction of ionospheric delay error.The dual-frequency receiver biggest advantage is the satellite navigation signals that can receive different frequency range simultaneously; Can eliminate of the influence of ionospheric delay error basically to position coordinate; Dot spacing is from surpassing 1000Km; Therefore dual-frequency receiver is not when adopting the external auxiliary localization method, and bearing accuracy can reach about 1m.And when adopting real time dynamic differential to measure (RTK) technology; Dual-frequency receiver can have the bearing accuracy of mm level, and this has important effect in high-acruracy surveys such as geodetic surveying, engineering survey, photogrammetric measurement, earth movement monitoring, engineering project deformation monitoring are used.
Double frequency GNSS receiver requires to receive simultaneously two-way GNSS signal; The traditional double frequency receiver adopts two RF front-end chips to form; As shown in Figure 1, satellite-signal is after antenna reception and LNA amplification, and (Power Splitter) is divided into two paths of signals with input signal by power splitter.Two paths of signals through two independently single frequency receiving receive, convert digital signal to through ADC again and give digital baseband and handle simultaneously.The traditional double frequency receiver has following defective: at first, whole receiver needs independently single frequency receiving of power splitter and two, so the system hardware cost is high, and power consumption is big, and chip volume is big.Secondly because each receiver has independently reference clock and exists spurious signal to distribute, thereby and these spurious signals each other intermodulation influence the performance of receiver.
Summary of the invention
It is limited to the objective of the invention is to overcome the single-frequency GPS receiver bearing accuracy, and existing traditional double frequency receiver needs independently single frequency receiving of power splitter and two, so the system hardware cost is high; Power consumption is big; Chip volume is big, thus spurious signal each other intermodulation influence many shortcomings such as performance of receiver, and satisfy the application demand of GNSS receiver; A kind of monolithic dual frequency global satellite navigation receiver has been proposed; According to the characteristics of global navigation satellite signal, signal is divided into two frequency separations of image signal each other, receive the global navigation satellite signal of each frequency separation respectively through two receiving cables on the same chip; And two shared two identical frequency synthesizers of receiving cable realize that the double frequency satellite navigation signals receives simultaneously.
The objective of the invention is to realize through following technical scheme.A kind of single-chip dual frequency global satellite navigation receiver, its formation comprises:
(1) A receiving cable is receiving cable independently;
(2) B receiving cable is receiving cable independently;
(3) frequency synthesizer 1, for A receiving cable and B receiving cable provide local frequency LO1;
(4) frequency synthesizer 2, for A receiving cable and B receiving cable provide local frequency LO2;
(5) baseband processing module;
Said A receiving cable comprises A channel first order module and the A channel second level module that is connected in series; The input end of A channel first order module inserts 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF, and the output terminal of A channel second level module is received baseband processing module;
Said B receiving cable comprises B passage first order module and the B passage second level module that is connected in series; The input end of B passage first order module inserts 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF, and the output terminal of B passage second level module is received baseband processing module;
Said frequency synthesizer 1 output terminal LO1 connects the local oscillation signal input end of A channel first order module and B passage first order module;
Said frequency synthesizer 2 output terminal LO2 connect the local oscillation signal input end of A channel second level module and B passage second level module;
Two receiving cable basis signal configurations of said A and B receive the global navigation satellite signal of a different frequency range respectively, and realization receives the function of the global navigation satellite signal of two frequency ranges simultaneously; Two shared same frequency compositors of receiving cable are saved two frequency synthesizers than traditional double frequency global navigational satellite receiver;
Two input ends of said baseband processing module connect the output terminal of A and two receiving cables of B; Each input end signal is handled final location of realization and navigation for through Low Medium Frequency or zero intermediate frequency digital signal after receiving cable frequency conversion, filtering, amplification, the analog to digital conversion through baseband processing module.
Said dual frequency global satellite navigation receiver is integrated on the same chip.
Said single-chip dual frequency global satellite navigation receiver; It is said A and two receiving cables of B; Be independently global navigational satellite signal receiving cable; Receive the signalling channel configuration and dispose the satellite navigation signals of a frequency range of each receiving cable individual processing by external microcontroller through digital interface.
Said single-chip dual frequency global satellite navigation receiver; It is that the said global navigation satellite signal that receives two frequency ranges simultaneously comprises two different frequency range signals that receive same satellite navigation system simultaneously; Perhaps receive two frequency band signals of two different satellite navigation systems simultaneously, the pattern that receives signal is disposed through digital interface by external microcontroller.
Said single-chip dual frequency global satellite navigation receiver; It is shared two frequency synthesizer modules of said two receiving cables; The first order level module shared frequency compositor 1 of the first order level module of A receiving cable and B receiving cable; The second level level module shared frequency compositor 2 of the second level level module of A receiving cable and B receiving cable, local oscillation signal is produced by frequency synthesizer module.
Realize different-waveband global navigation satellite signal configures through the output frequency that changes two frequency synthesizers simultaneously.
Said single-chip dual frequency global satellite navigation receiver, its circuit structure that is said two receiving cables is identical, and each receiving cable is made up of independent configurable two-rank module, and each grade module connects a local oscillation signal.
Said single-chip dual frequency global satellite navigation receiver; It is two-way satellite navigation signals that two receiving cables of said A and B receive image signal each other; Wherein, each road receiving cable is realized the inhibition to another road image signal through complex filter in sheet outer filter or the sheet.
Said single-chip dual frequency global satellite navigation receiver; It is that each receiving cable of said two receiving cables is configurable receiving cable circuit structure; Be used for according to different satellite-signals, be configured to a kind of circuit structure in the circuit structure of the two conversion of Low Medium Frequency, zero intermediate frequency and superhet.
Said single-chip dual frequency global satellite navigation receiver, it is that said configurable receiving cable circuit structure comprises first order module, second level module and baseband processing module.In the first order module radio frequency amplifier is arranged, frequency mixer, and LC wave filter; Second level module has intermediate frequency amplifier and frequency mixer, configurable wave filter (PPF/LPF), gain amplifier and A-D converter to form; The sheet outside antenna receive send here the radiofrequency signal that contains the high-frequency carrier wave of satellites transmits; At first signal is amplified through the changeable LNA low noise amplifier of input wave band in the first order module; Be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave through frequency mixer again; The frequency mixer of the output signal of first order module through second level module further with the carrier frequency step-down after output to after the filtering, amplification, analog to digital conversion and output to baseband processing module after baseband processing module or second level module are directly exported signal filtering, amplification, analog to digital conversion with the first order; Baseband processing module is handled Low Medium Frequency or zero intermediate frequency digital signal, realizes final location and navigation.
Said single-chip dual frequency global satellite navigation receiver; It is that every grade of module in the two-rank module of said receiving cable all can be configured to the circuit structure of different mode; First order block configuration becomes to be used to realize that radio frequency amplifies and frequency transformation; First order block configuration becomes to be used to realize that radio frequency amplifies and the circuit of frequency transform function; Second level module can be disposed for realizing that frequency transformation, signal filtering, signal amplify and the circuit of analog-digital conversion function, or is configured as the circuit of signal filtering, signal amplification and analog-digital conversion function.
Said single-chip dual frequency global satellite navigation receiver; Its output local frequency that is said frequency synthesizer module is to change within the specific limits: the frequency range of two frequency synthesizer module output local oscillators is inequality; The frequency of first frequency synthesizer covers whole satellite navigation signals frequency range, for 1.10GHz arrives 1.61GHz; The frequency of second frequency synthesizer is much smaller than first frequency synthesizer, for 150MHz arrives 220MHz.
It is exactly that signal in band is not evenly distributed on frequency spectrum that the GNSS signal has an important characteristic; Be distributed in several intervals but concentrate; For L1, the L2 of GPS, the E5a of Galileo, E5b, the L2 of GLONASS; The central frequency distribution of their signals is referred to as the I district in 1176.45～1248.625MHz frequency range; The L1 midband frequency of the E2-L1-E1 of Galileo and GPS is 1575.42MHz all, is called the II district, and the L1 wave band of GLONASS is separately in the III district, and the centre frequency scope is 1598.0625～1605.375MHz.
Fig. 2 is a global navigation satellite signal spectrum distribution plan.Distance from the I district to the II district is 326.795～398.97MHz; The II district is to the distance 22.6425～29.955MHz in III district; The I district is 349.4375～428.925MHz to the distance in III district, and has following characteristics: the I district is close basically to the distance of III with the I district to the distance in II district.If two passages with I and II district signal or I and III district signal difference input receiver; And satisfy first order IF-FRE near both distances half the time; Two passages can adopt same local oscillation circuit; Same reason, when first order IF-FRE to be the II district leave to the III offset half the near the time, II and III can realize receptions simultaneously by two passages of receiver.
The global navigation satellite receiver need realize receiving simultaneously I and II district signal or I and III district signal, and whole receiver is integrated on the single chip.
The composition structure of monolithic global navigation satellite receiver comprises two independent receiving cables, two frequency synthesizers and baseband processing module.Each receiving cable circuit structure comprises first order module, second level module.In the first order module radio frequency amplifier is arranged, frequency mixer, and LC wave filter; Second level module has intermediate frequency amplifier and frequency mixer, configurable wave filter (PPF/LPF), and gain amplifier and A-D converter are formed.Baseband processing module is used for handling simultaneously the signal of two receiving cables after analog to digital conversion, realizes final location and navigation.The sheet outside antenna receive send here the radiofrequency signal that contains the high-frequency carrier wave of satellites transmits; At first signal is amplified through the radio frequency amplifier in the first order module; Be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave through frequency mixer again, the frequency mixer of the output signal of first order module through second level module further with the carrier frequency step-down after output to after the filtering, amplification, analog to digital conversion and output to baseband processing module after baseband processing module or second level module are directly exported signal filtering, amplification, analog to digital conversion with the first order.
First receiving cable is called A channel, and second receiving cable is called the B passage, and B channel module and processing capacity thereof are identical with A channel.Two frequency synthesizers produce two local oscillation signals respectively, and correspondence offers two independent A channel module and B channel modules that receive and is used for mixing, therefore can reduce spuious the influencing each other of frequency between two independent receiving cables.Each receiving cable adopts configurable receiver structure; According to different satellite-signals, can receiver be configured to the two mapped structures of Low Medium Frequency, zero intermediate frequency and superhet through digital interface, when being operated in Low Medium Frequency; After the frequency mixer of first order module amplifies signal through radio frequency amplifier; Through frequency mixer input signal is transformed to Low Medium Frequency again, second level module is carried out filtering with the output signal of first order module, and the configurable filter of accomplishing filter function is operated in the complex filter pattern; Configurable filter is to image signal; The useful letter that is another receiving cable suppresses, and after filtered signal amplifies through gain amplifier again, converts digital signal output to through A-D converter.When being operated in the zero intermediate frequency pattern, signal path is the same with the Low Medium Frequency pattern, with the Low Medium Frequency mode difference be that configurable filter is operated in the low-pass filter pattern.When being operated in the superhet pattern, the frequency mixer of first order module transforms to intermediate-freuqncy signal through frequency mixer with input signal after through radio frequency amplifier signal being amplified; Because IF-FRE is high, can pass through LC wave filter filtering image signal, then; Output to second level module through the filtered signal of LC, second level module converts the signal into zero carrier frequency or low carrier frequency, at this moment; Configurable filter is operated in low pass pattern or complex filter pattern; Signal is amplified zero carrier frequency or low carrier frequency signal by gain amplifier through behind the LPF again, becomes digital signal output by the analog to digital conversion conversion of signals.
And each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.When receiver received I and II district signal, the image signal that receives I district signal receiving cable was an II district signal, therefore needed to suppress II district signal, and the image signal that receives II district signal receiving cable is an I district signal, therefore needed to suppress I district signal.In like manner, when receiving I and III district signal, two receiving cables need suppress the signal of another receiving cable.
The frequency of each frequency synthesizer in said two frequency synthesizers is to change within the specific limits:
The frequency range of first frequency synthesizer output local oscillator is from 1.10GHz to 1.61GHz;
The frequency range of second frequency synthesizer output local oscillator is from 150MHz to 220MHz.
This receiver can adopt CMOS technology to be integrated in the same chip.
Substantial effect of the present invention is:
1, realized the reception of all global navigation satellite signals through two receiving cables of shared frequency compositor; Receiver can be operated in four kinds and receive the signalling channel pattern; The configuration of various patterns is to be accomplished through SPI digital interface integrated on the sheet 418 by external microcontroller; The circuit hardware cost is low, and is simple in structure, flexible configuration.
2, two independent receiving cables and two local oscillator LO1 and LO2, therefore not only having reduced receiver takies area of chip, reduces spuious the influencing each other of frequency between two independent receiving cables simultaneously, has receptivity preferably.
3, each receiving cable adopts configurable receiver structure; Be configured to the two mapped structures of Low Medium Frequency, zero intermediate frequency and superhet according to different satellite-signals; And each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.
4, two receiving cables have reduced the power consumption of dual-frequency receiver in being integrated in same chip.
5, can adopt the integrated whole receiver circuit of CMOS technology single-chip, satisfy the application demand of high-performance GNSS receiver.
Description of drawings
Fig. 1 is traditional double frequency global navigation satellite receiver.
Fig. 2 is a global navigation satellite signal spectrum distribution plan.
Fig. 3 is the theory diagram that the present invention is based on the single-chip double frequency satellite navigation receiver of shared frequency compositor.
Fig. 4 is the circuit theory diagrams of the present invention's first embodiment based on the single-chip double frequency satellite navigation receiver of shared frequency compositor.
Fig. 5 is that each receiving cable of second embodiment of the invention is configured to Low Medium Frequency, zero intermediate frequency reciver receive channel signal flow diagram.
Fig. 6 is the two conversion Low Medium Frequencies of third embodiment of the invention superhet, zero intermediate frequency reciver receive channel signal flow diagram.
Embodiment
The present invention is based on the theory diagram of the single-chip dual frequency global satellite navigation receiver of shared frequency compositor, as shown in Figure 3.Monolithic dual frequency global satellite navigation receiver of the present invention is integrated on the single chip, is installed on the global navigation satellite receiver, realizes receiving simultaneously I and II district signal or I and III district signal.Whole receiver is made up of two independent receiving cables, two frequency synthesizers and baseband processing module.The A receiving cable is made up of A channel first order module 301 and A channel second level module 302; The RF input signal that antenna receives; Input A channel first order module 301 input ends; Through the first order module 301 and second level module 302 modules that is connected in series, radiofrequency signal is amplified, and be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave; By 302 modules signal is exported to the A road input end of baseband processing module 307, by analog to digital converter analog baseband signal and analog if signal are converted into digital baseband signal and digital medium-frequency signal again.The B receive path is made up of with B passage second level module 306 the B passage first order module 305 that is connected in series; 305 modular circuit structures are identical with 301 modules; 306 modular circuit structures are identical with 302 modules; The RF input signal that antenna receives is from B passage first order module 305, the output signal from the B passage second level module 306 export to the B road input of baseband processing module 307, processing capacity is identical with A channel.First frequency compositor 303 produces local oscillation signal LO1, and second frequency compositor 304 produces local oscillation signal LO2.The frequency range of first frequency synthesizer 303 output local oscillator LO1 is from 1.1GHz to 1.61GHz, and the frequency range of second frequency synthesizer 304 output local oscillator LO2 is from 150MHz to 220MHz.Two local oscillator LO1 and LO2 offer each independent receiving cable, therefore can reduce spuious the influencing each other of frequency of each independent receiving cable.Each receiving cable adopts configurable receiver structure; Be configured to the two mapped structures of Low Medium Frequency, zero intermediate frequency and superhet according to different satellite-signals; And each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.When receiver received I and II district signal, the image signal that receives I district signal receiving cable was an II district signal, therefore needed to suppress II district signal, and the image signal that receives II district signal receiving cable is an I district signal, therefore needed to suppress I district signal.In like manner, when receiving I and III district signal, two receiving cables need suppress the signal of another receiving cable.
Figs also combines embodiment that technical scheme of the present invention is done further to specify.
First embodiment
The present invention's first embodiment is based on the circuit theory diagrams of the single-chip double frequency satellite navigation receiver of shared frequency compositor, and is as shown in Figure 4.Single-chip double frequency satellite navigation receiver is by two independently A receiving cables 41 and B receiving cable 42, and first frequency frequency synthesizer 43-1 and second frequency frequency synthesizer 43-2 and baseband processing module 44 are formed.A receiving cable 41 is made up of A channel first order module 41-1 and A channel second level module 41-2.A channel first order module is by LNA401, mixer 402,404 and 405, and quadrature phase circuit 403 and if bandpas filter 406 are formed.Wherein 402 and 404 is orthogonal mixer, and the local oscillation signal L01 that frequency synthesizer 43-1 produces gives orthogonal mixer 402 and 404 after being handled by quadrature phase circuit 403.A channel second level module is by intermediate frequency amplifier 407, orthogonal mixer 408 and 410, and configurable filter 411, variable gain amplifier 412 and 414, quadrature phase circuit 409 and analog to digital conversion circuit 413 and 415 cascades are formed.Wherein 410 and 408 is orthogonal mixer, and the local oscillation signal L02 that frequency synthesizer 43-2 produces gives orthogonal mixer 408 and 410 after being handled by quadrature phase circuit 409.Configurable filter 411 can be configured as low-pass filter or complex filter.Analog to digital conversion circuit 413 and 415 adopts the output of four bits, and baseband processing module 44 is delivered in the analog to digital conversion circuit 413 of A receiving cable 41 and 415 output.
Therefore two local oscillator LO1 that shared first frequency frequency synthesizer 43-1 of two independent receiving cables of A and B and second frequency frequency synthesizer 43-2 produce and LO2 can reduce spuious the influencing each other of frequency between two independent receiving cables.Each receiving cable adopts configurable receiver structure; Be configured to the two mapped structures of Low Medium Frequency, zero intermediate frequency and superhet according to different satellite-signals; And each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.
Module 404,409,422,427 functions in A channel and the B passage are identical, all are the orthogonal signal that the single channel local oscillation signal becomes phase phasic difference 90 degree are offered frequency mixer.
Each receiving cable of receiver structure shown in Figure 4 not only can be configured to above-mentioned three kinds of receiver structures, and, can be operated in four kinds of receiving modes: the low intermediate frequency receiver receiving mode; The zero intermediate frequency reciver receiving mode; Superhet double conversion receiver Low Medium Frequency output mode and superhet double conversion receiver zero intermediate frequency output mode are in every kind of receiver mode, for the receiving cable inner module; The module work of having only signal to pass through, other module is in closed condition.Because two receiving cables are identical, below be the reception programme that example specifies every kind of receiving mode with one of them passage A.
The low intermediate frequency receiver receiving mode; The zero intermediate frequency reciver receiving mode; The receiving cable of superhet double conversion receiver Low Medium Frequency output mode and four kinds of receiving modes of superhet double conversion receiver zero intermediate frequency output mode constitutes; With a signalling channel pattern configurations is example, and another signalling channel can dispose equally.
(1) low intermediate frequency receiver receiving mode
The A receiving cable information flow diagram of the low intermediate frequency receiver pattern that is configured to of second embodiment of the invention, as shown in Figure 5.This Mode A passage first order module is by LNA low noise amplifier 401, Mixer orthogonal mixer 402 and 404 and orthogonal local oscillation generation module 403 form.This Mode A passage second level module is by PPF/LPF configurable filter 411, VGA variable gain amplifier 412 and 414 and ADC analog to digital conversion adc circuit 413 and 415 form.LNA401 selects the corresponding work frequency range according to the GNSS signal in band, and configurable filter 411 is configured to the PPF complex filter.The signalling channel signal flow of this Mode A passage is: input signal amplifies through LNA 401 (BA0); Amplifying signal dispensing Mixer orthogonal mixer 402 (BA1B) and 404 (BA1A); Corresponding orthogonal local oscillation LO1 mixing of exporting with orthogonal local oscillation generator 403; PPF configurable filter 411 (BA5) complex filter is sent in two-way mixing output, and two-way complex filter output correspondence is sent VGA412 (BA6A) and ADC413 (BA7A) and VGA414 (BB6A) and ADC415 (BA7A).Because I in the low intermediate frequency receiver, the Q two-way all contains identical intermediate-freuqncy signal, and just therefore quadrature in phase, can select any one the tunnel to export to baseband processing module 44 after configurable filter 411 filtering.
(2) zero intermediate frequency reciver receiving mode
The A receiving cable information flow diagram of zero intermediate frequency reciver receiving mode, as shown in Figure 5.The module and the low intermediate frequency receiver pattern of this mode signal path process are just the same; Have only modules configured different; Configurable filter 411 these pattern configurations of second level module become the LPF low-pass filter; Because zero intermediate frequency I, Q two-way are the real part and the imaginary part of complex base band signal, therefore must adopt the quadrature two-way to export simultaneously.
(3) superhet double conversion receiver Low Medium Frequency output mode
The A receiving cable information flow diagram of the superhet double conversion receiver Low Medium Frequency output mode of third embodiment of the invention, as shown in Figure 6.This pattern adopts two-stage analog intermediate frequency structure, and A receiving cable first order module is by low noise amplifier 401, and single channel frequency mixer 405 is formed with the outer LC BPF if bandpas filter 406 of sheet.A receiving cable second level module is by IFA intermediate frequency amplifier 407; Orthogonal mixer MirerQ408 and MirerI410; Orthogonal local oscillation generator 409, configurable filter 411, VGA variable gain amplifier 412 and 414 and ADC analog to digital conversion circuit 413 and 415 form.First order frequency mixer adopts single channel output, and LC if bandpas filter 406 filtering intermediate frequency intermodulation clutter interference also further suppress undesired signal outside the input tape outside being with outside sheet, input orthogonal mixer 408 and 410 after intermediate frequency amplifier 407 further amplifies.Configurable filter 411 is configured to complex filter; After quadrature I, Q two paths of signals process are configured to configurable filter 411 complex filters and image signal inhibition of complex filter; I, Q two paths of signals further amplify through corresponding VGA variable gain amplifier 412 and 414 again; After ADC 413 and 415 samplings, adopt quadrature I, the output of Q two-way numeral.
The signalling channel signal flow of this Mode A passage is: input signal amplifies through LNA 401 (BA0); Amplifying signal dispensing Mixer orthogonal mixer 405 (BA2); Corresponding orthogonal local oscillation LO1 mixing of exporting with orthogonal local oscillation generator 403; One tunnel mixing output send sheet outer LC BPF BPF. 406 filtering; IFA intermediate frequency amplifier 407 is sent in bandpass filtering output; Intermediate frequency amplifies output and divides I and Q two-way, and correspondence is sent MixerI orthogonal mixer 410 (BA4A) and MixerQ orthogonal mixer 408 (BA4B), the orthogonal local oscillation LO2 mixing of correspondence and 409 outputs of orthogonal local oscillation generator; PPF configurable filter 411 (BA5) complex filter is sent in I and Q two-way mixing output, and two-way complex filter output correspondence send VGA412 (BA6A) gain amplification and ADC413 (BA7A) analog to digital conversion and VGA414 (BB6A) gain to amplify and ADC415 (BA7A) analog to digital conversion.Because I in the low intermediate frequency receiver, the Q two-way all contains identical intermediate-freuqncy signal, and just therefore quadrature in phase, can select any one the tunnel to export to baseband processing module 44 after configurable filter 411 filtering.
(4) the two conversion zero intermediate frequency output modes of superhet
The A receiving cable information flow diagram of superhet double conversion receiver zero intermediate frequency output mode, as shown in Figure 6.This pattern is the same with the pattern that the two conversion Low Medium Frequency outputs of superhet are adopted.With the two conversion Low Medium Frequency output mode differences of superhet be: be output as the zero intermediate frequency baseband signal after the frequency transformation for the second time of this pattern, so configurable filter 411 is configured to the LPF low-pass filter, baseband signal adopts I, Q two-way to export simultaneously.
Local oscillator LO1 that two receiving cables are shared and LO2 are produced by two independent frequency compositors 1 and frequency synthesizer 2 respectively, and are spuious for reducing frequency, two frequency synthesizers 416 and 417 shared same input reference clock circuit OSC.
The configurable receiving mode of the present invention is a lot, the different received pattern, and the function of module is different, tired no longer one by one stating.
In sum, because whole receiver adopts configurable setting, not only the receiver signal channel architecture is configurable, and the channel interior frequency mixer, and the function of wave filter is configurable.The configuration of the various patterns of receiver is to be accomplished through integrated SPI digital interface 418 on the sheet by external microcontroller.Changeable through the SPI digital interface to the receiving wave range of LNA low noise amplifier; To the selection of frequency mixer, configurable filter 411 is configured to PPF or LPF, two-way VGA is amplified and analog-to-digital selection; Realize the configuration of channel signal stream, make receiver can be operated in four kinds of receiving modes.
The above; Be merely the detailed description that realizes the specific embodiment of the invention of instructions description of the present invention and graphic; Be used for illustration and unrestricted, but characteristic of the present invention is not limited thereto, those skilled in the art obviously understand; All scopes of the present invention should be as the criterion with the protection domain of its claim; Under the prerequisite of invention spirit that does not deviate from appended claims and defined and invention scope, other embodiment that the variation similar with it of all spirit according to the present invention implemented all should be included among the protection category of the present invention.
Claims (10)
1. single-chip dual frequency global satellite navigation receiver, its formation comprises:
(1) A receiving cable is receiving cable independently;
(2) B receiving cable is receiving cable independently;
(3) frequency synthesizer 1, for A receiving cable and B receiving cable provide local frequency LO1;
(4) frequency synthesizer 2, for A receiving cable and B receiving cable provide local frequency LO2;
(5) baseband processing module;
Said A receiving cable comprises A channel first order module and the A channel second level module that is connected in series; The input end of A channel first order module inserts 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF, and the output terminal of A channel second level module is received baseband processing module;
Said B receiving cable comprises B passage first order module and the B passage second level module that is connected in series; The input end of B passage first order module inserts 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF, and the output terminal of B passage second level module is received baseband processing module;
Said frequency synthesizer 1 output terminal LO1 connects the local oscillation signal input end of A channel first order module and B passage first order module;
Said frequency synthesizer 2 output terminal LO2 connect the local oscillation signal input end of A channel second level module and B passage second level module;
Two receiving cable basis signal configurations of said A and B receive the global navigation satellite signal of different frequency range respectively, and realization receives the function of the global navigation satellite signal of two frequency ranges simultaneously; Two shared same frequency compositors of receiving cable are saved two frequency synthesizers than traditional double frequency global navigational satellite receiver;
Two input ends of said baseband processing module connect the output terminal of A and two receiving cables of B; Each input end signal is handled realization location and navigation for through Low Medium Frequency or zero intermediate frequency digital signal after receiving cable frequency conversion, filtering, amplification, the analog to digital conversion through baseband processing module;
Said dual frequency global satellite navigation receiver is integrated on the same chip.
2. according to right 1 said single-chip dual frequency global satellite navigation receiver; It is characterized in that; Two receiving cables of said A and B; Be independently global navigational satellite signal receiving cable, receive the signalling channel configuration and dispose the satellite navigation signals of a frequency range of each receiving cable individual processing by external microcontroller through digital interface.
3. according to right 1 said single-chip dual frequency global satellite navigation receiver; It is characterized in that; The said global navigation satellite signal that receives two frequency ranges simultaneously comprises two different frequency range signals that receive same satellite navigation system simultaneously; Perhaps receive two frequency band signals of two different satellite navigation systems simultaneously, the pattern that receives signal is disposed through digital interface by external microcontroller.
4. according to right 1 said single-chip dual frequency global satellite navigation receiver; It is characterized in that; Shared two frequency synthesizer modules of said two receiving cables; The first order level module shared frequency compositor 1 of the first order level module of A receiving cable and B receiving cable, the second level level module shared frequency compositor 2 of the second level level module of A receiving cable and B receiving cable, local oscillation signal is produced by frequency synthesizer module.
5. according to right 2 said single-chip dual frequency global satellite navigation receivers, it is characterized in that the circuit structure of said two receiving cables is identical, each receiving cable is made up of independent configurable two-rank module, and each grade module connects a local oscillation signal.
6. according to right 1 said single-chip dual frequency global satellite navigation receiver; It is characterized in that; The two-way satellite navigation signals that two receiving cables of said A and B receive is image signal each other; Wherein, each road receiving cable is realized the inhibition to another road image signal through complex filter in sheet outer filter or the sheet.
7. according to right 3 said single-chip dual frequency global satellite navigation receivers; It is characterized in that; Each receiving cable of said two receiving cables is configurable receiving cable circuit structure; Be used for according to different satellite-signals, be configured to a kind of circuit structure in the circuit structure of the two conversion of Low Medium Frequency, zero intermediate frequency and superhet.
8. according to right 7 said single-chip dual frequency global satellite navigation receivers, it is characterized in that said configurable receiving cable circuit structure comprises first order module, second level module; In the first order module radio frequency amplifier is arranged, frequency mixer, and LC wave filter; Second level module has intermediate frequency amplifier and frequency mixer, configurable wave filter (PPF/LPF), gain amplifier and A-D converter to form; The sheet outside antenna receive send here the radiofrequency signal that contains the high-frequency carrier wave of satellites transmits; By the changeable LNA low noise amplifier of the input wave band in the first order module signal is amplified; Be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave through frequency mixer; The output signal of first order module by the frequency mixer of second level module with the carrier frequency step-down after output to after the filtering, amplification, analog to digital conversion and output to baseband processing module after baseband processing module or second level module are directly exported signal filtering, amplification, analog to digital conversion with the first order; Baseband processing module is handled Low Medium Frequency or zero intermediate frequency digital signal, realizes location and navigation.
9. according to the said single-chip dual frequency global of right 1-8 satellite navigation receiver; It is characterized in that; Every grade of module in the two-rank module of said receiving cable all can be configured to the circuit structure of different mode; First order block configuration becomes to be used to realize that radio frequency amplifies and the circuit of frequency transformation, and second level module can be disposed for realizing that frequency transformation, signal filtering, signal amplify and analog-to-digital circuit, or is configured as signal filtering, signal amplification and analog-to-digital circuit.
10. according to the said single-chip dual frequency global of right 1-9 satellite navigation receiver; It is characterized in that; The output local frequency of said frequency synthesizer module is to change within the specific limits: the frequency range of two frequency synthesizer module output local oscillators is inequality; The frequency of first frequency synthesizer covers whole satellite navigation signals frequency range, for 1.10GHz arrives 1.61GHz; The frequency of second frequency synthesizer is much smaller than first frequency synthesizer, for 150MHz arrives 220MHz.
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| WO2024055721A1 (en) * | 2022-09-16 | 2024-03-21 | 华为技术有限公司 | Terminal device |
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