CN107942355A - A kind of parallel GNSS radio-frequency transmitters of four mould triple channels - Google Patents
A kind of parallel GNSS radio-frequency transmitters of four mould triple channels Download PDFInfo
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- CN107942355A CN107942355A CN201711089632.XA CN201711089632A CN107942355A CN 107942355 A CN107942355 A CN 107942355A CN 201711089632 A CN201711089632 A CN 201711089632A CN 107942355 A CN107942355 A CN 107942355A
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- frequency
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- beidou
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
Abstract
The invention discloses a kind of parallel GNSS radio-frequency transmitters of four mould triple channels, including full duplex synchronous serial Peripheral Interface and receiving channel；GPS/Galileo passages, BeiDou passages and GLONASS passages are provided with the receiving channel, it is characterised in that：Receiving channel uses a RF signal input end, it is parallel at the same time to receive the global four large satellite navigation signals of GPS, Galileo, BeiDou and GLONASS, and after carrying out down coversion and digitized processing to received signal, GPS, Galileo, BeiDou and GLONASS digital medium-frequency signal of tetra- kinds of patterns are provided for GNSS base band；And register configuration is carried out to receiving channel by full duplex synchronous serial Peripheral Interface, control all passages in receiving channel to work at the same time either any two channels operation or any one channels operation；The present invention can realize on one chip while receive GPS of America satellite, GLONASS satellite, European Union's Galileo satellite and the China's BeiDou satellites of Russia, and the search of satellite time is short, and positioning accuracy is high, can be widely used in GNSS satellite navigation field.
Description
Technical field
The invention belongs to satellite navigation radio circuit technical field, and in particular to four mould satellite navigations can be supported to believe at the same time
Number triple channel RF receiving circuit, more particularly to a kind of frequency synthesizer circuit for supporting more local oscillators and system frequency planning side
Case.
Background technology
Global navigation satellite system GNSS (Global Navigation Satellite System) includes the U.S.
GPS, the GLONASS of Russia, the Galileo of European Union and the tetra- large satellite alignment systems of BeiDou of China, with various countries' satellite
The gradual perfection of alignment system, has promoted the development of multisystem combined positioning in terminal applies, has derived multimode single channel, more
The radio-frequency transmitter scheme such as mould binary channels.
At present, in multimodal satellite navigation receiver scheme at home, all using single channel or twin-channel scheme.Only
GPS and BeiDou signals or GPS and GLONASS signal can be received at the same time, such as, " Dual channel navigation radio frequency connects patent of invention
Receipts machine " (number of patent application 201110103268.4), it is proposed that one kind can receive GPS of America and China BeiDou navigation at the same time
The receiver of satellite, two independent down coversion passages of single-chip integration, it is impossible to while receive four kinds of Global Navigation Satellite System
Location information.If to receive four mould satellite-signals at the same time, it is necessary to using two or more receiver parallels scheme, this
Kind scheme can not meet the low work(of existing satellite navigation terminal alignment system there are the problems such as volume is big, power consumption is high and uniformity is poor
Consumption, small size and high-precision requirement.
The content of the invention
The technical problems to be solved by the invention are：Using the framework of a frequency synthesizer, while support GPS/
The parallel GNSS radio frequency receptions of four mould triple channels of tetra- mould triple channel satellite navigation radio-frequency signal of Galileo, BeiDou and GLONASS
Machine.
In order to solve the above-mentioned technical problem the present invention, adopts the following technical scheme that：
A kind of parallel GNSS radio-frequency transmitters of four mould triple channels, including full duplex synchronous serial Peripheral Interface (SPI) and connect
Receive passage；GPS/Galileo passages, BeiDou passages and GLONASS passages are provided with the receiving channel, it is characterised in that：
Receiving channel uses a RF signal input end mouth, while receives GPS, Galileo, BeiDou and GLONASS whole world parallel
Four large satellite navigation signals, and after carrying out down coversion and digitized processing to received signal, for GNSS base band provide GPS,
The digital medium-frequency signal of tetra- kinds of patterns of Galileo, BeiDou and GLONASS；Three passages can carry out independent control, and lead to
Cross full duplex synchronous serial Peripheral Interface to receiving channel carry out register configuration, control receiving channel in all passages at the same time
Work either any two channels operation or any one channels operation.
The present invention uses three independent receiving channels, can be realized on one chip and receive four kinds of worldwide navigations parallel
The function of satellite-signal.Radiofrequency signal of the present invention uses single ended input, three independent down coversion passages of Embedded, can
The digital medium-frequency signal of each 2-bit of triple channel is provided for base band at the same time.Due to the satellite that in field of satellite navigation, terminal receives
Quantity is more, and the search of satellite time is shorter, and positioning accuracy is higher, therefore, of the invention compared with conventional one-channel or binary channels,
Volume smaller, the performance of final navigation terminal are more excellent, can save power consumption and save cost, this four moulds triple channel is parallel
GNSS radio-frequency transmitter system architectures are that have very much application value.
The preferred solution of the parallel GNSS radio-frequency transmitters of four moulds triple channel according to the present invention, the radiofrequency signal are defeated
Enter end using wideband structural low-noise amplifier, the low-noise amplifier be used for receive GPS, Galileo, BeiDou and
GLONASS satellite navigation signal, RF mixer is output to after being amplified processing.
The RF mixer is used to carry out down coversion to received four moulds navigation signal using the first local oscillation signal (LO1)
Processing, the signal after frequency conversion are respectively outputted to GPS/Galileo passages, BeiDou passages and GLONASS passages.
The GPS/Galileo passages include channel selection filter one, summing circuit one, programmable gain amplifier
First, automatic gain control circuit one and analog-digital converter one.
The BeiDou passages include buffer amplifier, intermediate frequency mixer one, channel selection filter two, summing circuit
2nd, programmable gain amplifier two, automatic gain control circuit two and analog-digital converter two.
The GLONASS passages include buffer amplifier, intermediate frequency mixer two, channel selection filter three, summing circuit
3rd, programmable gain amplifier three, automatic gain control circuit three and analog-digital converter three.
The buffer amplifier receives the signal of the RF mixer output, after carrying out Hyblid Buffer Amplifier processing, is output to
Intermediate frequency mixer one and intermediate frequency mixer two.
The intermediate frequency mixer one, intermediate frequency mixer two are used to be utilized respectively the second local oscillation signal, the 3rd local oscillation signal pair
Received signal carries out double conversion processing, and the signal after frequency conversion is respectively outputted to channel selection filter two and Channel assignment filter
Ripple device three.
The channel selection filter one filters out what the needs in bandwidth were demodulated by setting the bandwidth of wave filter
GPS and Galileo intermediate-freuqncy signals, are output to summing circuit one.
The channel selection filter two filters out what the needs in bandwidth were demodulated by setting the bandwidth of wave filter
BeiDou intermediate-freuqncy signals, are output to summing circuit two.
The channel selection filter three filters out what the needs in bandwidth were demodulated by setting the bandwidth of wave filter
GLONASS intermediate-freuqncy signals, are output to summing circuit three.
The summing circuit one, summing circuit two and summing circuit three carry out summation operation realization to received signal respectively
After mirror image suppresses, it is respectively outputted to the programmable gain amplifier one, programmable gain amplifier two and programmable-gain and puts
Big device three.
The programmable gain amplifier one, programmable gain amplifier two, programmable gain amplifier three are used for becoming
Intermediate-freuqncy signal after frequency is amplified, and passes through automatic gain control circuit one, automatic gain control circuit two and automatic respectively
Gain control circuit three makes respective stable output signal in certain amplitude range, then is respectively outputted to analog-digital converter
First, analog-digital converter two and analog-digital converter three.
The analog-digital converter one, analog-digital converter two and analog-digital converter three are used to carry out digital quantity to received signal
Change, Buffer output is resolved to GNSS base band.
Unifrequency synthesizer framework is used inside inventive receiver, can export at the same time three road local oscillation signals and all the way when
Clock signal.
The preferred solution of the parallel GNSS radio-frequency transmitters of four moulds triple channel according to the present invention, also sets in the receiver
Frequency synthesizer is equipped with, which provides local oscillation signal for receiving channel；And pass through full duplex synchronous serial peripheral hardware
Interface carries out register configuration to frequency synthesizer, to control frequency synthesizer to carry out frequency handover.
The preferred solution of the parallel GNSS radio-frequency transmitters of four moulds triple channel according to the present invention, the frequency synthesizer bag
Include reference buffer, prescalar, counter, parametric frequency divider, phase frequency detector, charge pump, voltage controlled oscillator, local oscillator point
Frequency device and fractional frequency division modulator.
The reference buffer receives external crystal oscillator signal, is output to after being amplified Shape correction with reference to frequency dividing
Device.
After parametric frequency divider carries out scaling down processing to received reference signal, carried out through phase frequency detector and charge pump circuit
Built-in low-pass filter is output to after processing.
After low-pass filter is filtered the output voltage of charge pump, produces a stable DC and put down and shake to voltage-controlled
The frequency of oscillation for swinging device is controlled, and provides the first local oscillation signal for RF mixer, while output signals to VCO Hyblid Buffer Amplifiers
Device.
After the signal that VCO buffer amplifiers produce voltage controlled oscillator carries out Hyblid Buffer Amplifier processing, pass through local oscillator point respectively
Frequency device one and local oscillator frequency divider two are that intermediate frequency mixer one provides the second local oscillation signal and are that intermediate frequency mixer two provides the 3rd
Shake signal；Meanwhile counter is also output signals to by prescalar, fractional frequency division modulator is real into row interpolation to counter
Existing fractional frequency division ratio.
Prescalar carries out multi-mode programmable scaling down processing with the signal that counter produces voltage controlled oscillator, is output to
Phase frequency detector.
The preferred solution of the parallel GNSS radio-frequency transmitters of four moulds triple channel according to the present invention, the oscillator are also logical
Cross local oscillator frequency divider three and provide clock signal for the analog-digital converter one, analog-digital converter two and analog-digital converter three.
The beneficial effect of the parallel GNSS radio-frequency transmitters of four moulds triple channel of the present invention is：The present invention is only using three
Vertical receiving channel, can realize on one chip and receive GPS of America satellite, the GLONASS satellite of Russia, European Union at the same time
Galileo satellite and China's BeiDou satellites, the number of satellite for making to receive during work greatly increase, and the search of satellite time is short,
Positioning accuracy is high, and an internal only integrated frequency synthesizer circuit, can be three at the same time by setting different frequency dividing ratios
Passage provides different local oscillation signals.Compared to Double channel scheme, volume smaller, the performance of final navigation terminal are more excellent, can
Power consumption is saved, and cost can be saved, can be widely used in GNSS satellite navigation field.
Brief description of the drawings
Fig. 1 is the parallel GNSS radio-frequency transmitters functional block diagram of four moulds triple channel of the present invention.
Embodiment
A kind of parallel GNSS radio-frequency transmitters of four mould triple channels, including full duplex synchronous serial Peripheral Interface and reception are led to
Road；GPS/Galileo passages, BeiDou passages and GLONASS passages are provided with the receiving channel；Receiving channel uses one
RF signal input end mouth, while the global four large satellite navigation signals of GPS, Galileo, BeiDou and GLONASS are received parallel,
And after carrying out down coversion and digitized processing to received signal, for GNSS base band provide GPS, Galileo, BeiDou and
The digital medium-frequency signal of tetra- kinds of patterns of GLONASS；Three passages can carry out independent control, and pass through full duplex synchronous serial
Peripheral Interface carries out register configuration to receiving channel, makes that all passages in receiving channel work at the same time or any two is led to
Road works or any one channels operation.Using the full duplex synchronous serial Peripheral Interface can realize internal receipt machine with it is outer
Communicate between portion's equipment, the switching of operating mode and passage is realized by peripheral equipment control receiver.SPI includes three
A input port：Serial clock SCLK lines, data cable SDATA and the effective chip selection signal nCS of low level.
RF signal input end uses the low-noise amplifier LNA of wideband structural, which is used to receive
GPS, Galileo, BeiDou and GLONASS satellite navigation signal, RF mixer RFMIX is output to after being amplified processing.
The RF mixer RFMIX is used to carry out down received four moulds navigation signal using the first local oscillation signal LO1
Frequency-conversion processing, the signal after frequency conversion are respectively outputted to GPS/Galileo passages, BeiDou passages and GLONASS passages.
The GPS/Galileo passages include one BPF1 of channel selection filter, one ∑ 1 of summing circuit, programmable-gain
One ADC1 of one PGA1 of amplifier, one AGC1 of automatic gain control circuit and analog-digital converter.
The BeiDou passages include buffer amplifier BUF1, one IFMIX1 of intermediate frequency mixer, channel selection filter two
BPF2, two ∑ 2 of summing circuit, two PGA2 of programmable gain amplifier, two AGC2 of automatic gain control circuit and analog-digital converter
Two ADC2.
The GLONASS passages include buffer amplifier BUF1, two IFMIX2 of intermediate frequency mixer, channel selection filter three
BPF3, three ∑ 3 of summing circuit, three PGA3 of programmable gain amplifier, three AGC3 of automatic gain control circuit and analog-digital converter
Three ADC3.
The buffer amplifier BUF1 receives the signal of the RF mixer RFMIX outputs, carries out Hyblid Buffer Amplifier processing
Afterwards, it is output to two IFMIX2 of one IFMIX1 of intermediate frequency mixer and intermediate frequency mixer.
One IFMIX1 of intermediate frequency mixer, two IFMIX2 of intermediate frequency mixer be used for be utilized respectively the second local oscillation signal LO2,
3rd local oscillation signal LO3 carries out received signal double conversion processing, and the signal after frequency conversion is respectively outputted to Channel assignment filter
Three BPF3 of two BPF2 of ripple device and channel selection filter.
By setting the bandwidth of wave filter, the needs filtered out in bandwidth are solved one BPF1 of channel selection filter
GPS the and Galileo intermediate-freuqncy signals of tune, are output to one ∑ 1 of summing circuit.
By setting the bandwidth of wave filter, the needs filtered out in bandwidth are solved two BPF2 of channel selection filter
The BeiDou intermediate-freuqncy signals of tune, are output to two ∑ 2 of summing circuit.
By setting the bandwidth of wave filter, the needs filtered out in bandwidth are solved three BPF3 of channel selection filter
The GLONASS intermediate-freuqncy signals of tune, are output to three ∑ 3 of summing circuit.
One ∑ 1 of summing circuit, two ∑ 2 of summing circuit and three ∑ 3 of summing circuit respectively seek received signal
After realizing that mirror image suppresses with computing, one PGA1 of programmable gain amplifier, programmable gain amplifier two are respectively outputted to
Three PGA3 of PGA2 and programmable gain amplifier.
One PGA1 of programmable gain amplifier, two PGA2 of programmable gain amplifier, programmable gain amplifier three
PGA3 is used to be amplified the intermediate-freuqncy signal after frequency conversion, and passes through one AGC1 of automatic gain control circuit, automatic gain respectively
Two AGC2 of control circuit and three AGC3 of automatic gain control circuit make respective stable output signal in certain amplitude range,
Three ADC3 of one ADC1 of analog-digital converter, two ADC2 of analog-digital converter and analog-digital converter is respectively outputted to again.
One ADC1 of analog-digital converter, two ADC2 of analog-digital converter and three ADC3 of analog-digital converter are used for received letter
Number digital quantization is carried out, Buffer output resolved to GNSS base band.
The present invention realizes the receiving area of GPS/Galileo, BeiDou and GLONASS satellite navigation signal using monolithic approach
Reason, by sharing a prevention at radio-frequency port, can receive four mould signals at the same time.The four mould signals received pass through low-noise amplifier
After LNA amplifications, down coversion is carried out into RF mixer RFMIX.Signal after single-conversion will be divided into three tunnels and carry out channel filter
Ripple and amplification, are finally quantified as the digital signal that base band can resolve through two ADC.
GPS/Galileo passages, that is, passage one,, can be at the same time by setting the bandwidth of wave filter using single-conversion framework
Receive processing GPS and Galileo satellite navigation signal.The needs that one BPF1 of channel selection filter is filtered out in bandwidth are solved
GPS the and Galileo intermediate-freuqncy signals of tune, after one PGA1 of programmable gain amplifier amplifications, stablize in certain amplitude model
Enclose and carry out digital quantization to analog-digital converter 1ADC1, resolved after Buffer output to GNSS base band.
BeiDou passages, that is, passage two, using double conversion framework, receive processing BeiDou satellite navigation signals.Radio frequency mixes
Signal after frequency device RFMIX frequency conversions is after buffering, into one IFMIX1 of intermediate frequency mixer, two BPF2 mistakes of channel selection filter
The BeiDou intermediate-freuqncy signals that the needs in bandwidth are demodulated are filtered out, after two PGA2 of programmable gain amplifier amplifications, surely
It is scheduled on certain amplitude range and carries out digital quantization to two ADC1 of analog-digital converter, is solved after Buffer output to GNSS base band
Calculate.
GLONASS passages, that is, passage three uses double conversion framework, receives processing GLONASS satellite navigation signal.Radio frequency
Signal after frequency mixer RFMIX frequency conversions is after buffering, into two IFMIX2 of intermediate frequency mixer, three BPF3 of channel selection filter
The GLONASS intermediate-freuqncy signals that the needs in bandwidth are demodulated are filtered out, after three PGA3 of programmable gain amplifier amplifications,
Stablize and carry out digital quantization to three ADC3 of analog-digital converter in certain amplitude range, solved after Buffer output to GNSS base band
Calculate.
A fractional expression frequency synthesizer is additionally provided with the GNSS radio-frequency transmitters, which is receiving channel
Local oscillation signal is provided；It is respectively that RF mixer RFMIX, one IFMIX1 of intermediate frequency mixer and two IFMIX2 of intermediate frequency mixer are carried
For local oscillation signal；And register configuration is carried out to frequency synthesizer PLL by full duplex synchronous serial Peripheral Interface SPI, with
Frequency synthesizer PLL is controlled to carry out frequency handover.
The frequency synthesizer includes reference buffer BUF3, prescalar DIV2, counter M/A, parametric frequency divider
DIV1, phase frequency detector PFD, charge pump CP, voltage controlled oscillator VCO, local oscillator frequency divider DIV4, DIV5 and fractional frequency division modulator
∑△。
The reference buffer BUF3 receives external crystal oscillator signal, and reference is output to after being amplified Shape correction
Frequency divider DIV1.
After parametric frequency divider DIV1 carries out scaling down processing to received reference signal, through phase frequency detector PFD and charge pump
CP circuits are output to low-pass filter LPF after being handled.
After low-pass filter LPF is filtered the output voltage of charge pump CP, produces a stable DC and put down pair
The frequency of oscillation of voltage controlled oscillator VCO is controlled, and is provided the first local oscillation signal LO1 for RF mixer RFMIX, is exported at the same time
Signal is to VCO buffer amplifiers BUF2.
After the signal that VCO buffer amplifiers BUF2 produces voltage controlled oscillator VCO carries out Hyblid Buffer Amplifier processing, pass through respectively
One DIV5 of local oscillator frequency divider and two DIV4 of local oscillator frequency divider provides the second local oscillation signal LO2 for one IFMIX1 of intermediate frequency mixer and is
Two IFMIX2 of intermediate frequency mixer provides the 3rd local oscillation signal LO3；Meanwhile counting is also output signals to by prescalar DIV2
Device M/A, fractional frequency division modulator ∑ △ realize fractional frequency division ratio to counter M/A into row interpolation.
The signal that prescalar DIV2 and counter M/A produces voltage controlled oscillator VCO carries out multi-mode programmable frequency dividing
Processing, is output to phase frequency detector PFD.
The oscillator VCO is one ADC1 of analog-digital converter, analog-digital converter also by three DIV3 of local oscillator frequency divider
Two ADC2 and three ADC3 of analog-digital converter provide clock signal.
Since the parallel GNSS radio-frequency transmitters of triple channel need the orthogonal local oscillation signal of three tunnel independences to be demodulated, first
The signal LO1 that shakes provides local oscillator to RF mixer RFMIX, and the second local oscillation signal LO2 is carried to the intermediate frequency mixer of BeiDou passages
For local oscillator, the 3rd local oscillation signal LO3 provides local oscillator to the intermediate frequency mixer of GLONASS passages.It is more compared to traditional more loops
Road local oscillation frequency synthesizer scheme, the present invention is internal only to integrate a phase-locked loop, by setting different frequency dividers outside loop
Frequency dividing ratio, to realize the more local oscillator outputs of single loop.Specific frequency distribution can use：
Set of frequency scheme proposed by the invention, enables the GNSS satellite of three passages while individual reception different frequency
Navigation signal, can effectively simplify system design, and it is spuious because different frequency intermodulation introduces to reduce system.
In order to reduce chip area and power consumption, frequency synthesizer PLL that the present invention is internally integrated is using fully integrated decimal/whole
Number divides changeable framework, supports the input of 10MHz~30MHz crystal oscillators.
The parallel four moulds triple channel GNSS radio-frequency transmitters that the present invention is developed, using the input of radiofrequency signal all the way, three tunnels
The design of digital medium-frequency signal output, can receive four kinds of global navigational satellite signals, including GPS L1 signal bands parallel at the same time
Wide 1563MHz~1587MHz, centre frequency 1575.42MHz, GLONASS G1 signal bandwidth 1593MHz~1610MHz, center
Frequency 1602MHz, Galileo E1 signal bandwidth 1559MHz~1591MHz, centre frequency 1575.42MHz and BeiDou B1
Signal bandwidth 1553MHz~1569MHz, centre frequency 1601.1MHz.Three passages receive four mould satellite-signals at the same time, effectively
The quantity of satellites in view is added, can be improved positioning accuracy with the process of increasing terminal search of satellite and extend global application
Scope, there is no similar integrated products to issue both at home and abroad.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (5)
1. a kind of parallel GNSS radio-frequency transmitters of four mould triple channels, including full duplex synchronous serial Peripheral Interface (SPI) and reception
Passage；GPS/Galileo passages, BeiDou passages and GLONASS passages are provided with the receiving channel, it is characterised in that：Connect
Receive passage and use a RF signal input end, while it is big to receive GPS, Galileo, BeiDou and GLONASS whole world four parallel
Satellite navigation signals, and after carrying out down coversion and digitized processing to received signal, for GNSS base band provide GPS,
The digital medium-frequency signal of tetra- kinds of patterns of Galileo, BeiDou and GLONASS；And pass through full duplex synchronous serial Peripheral Interface
(SPI) register configuration is carried out to receiving channel, all passages in receiving channel is worked at the same time or any two passage
Work or any one channels operation.
2. the parallel GNSS radio-frequency transmitters of four moulds triple channel according to claim 1, it is characterised in that：
RF signal input end is provided with the low-noise amplifier (LNA) of wideband structural, which is used to receive
GPS, Galileo, BeiDou and GLONASS satellite navigation signal, RF mixer is output to after being amplified processing
(RFMIX)；
The RF mixer (RFMIX) is used to carry out down received four moulds navigation signal using the first local oscillation signal (LO1)
Frequency-conversion processing, the signal after frequency conversion are respectively outputted to GPS/Galileo passages, BeiDou passages and GLONASS passages；
The GPS/Galileo passages include channel selection filter one (BPF1), summing circuit one (∑ 1), programmable-gain
Amplifier one (PGA1), automatic gain control circuit one (AGC1) and analog-digital converter one (ADC1)；
The BeiDou passages include buffer amplifier (BUF1), intermediate frequency mixer one (IFMIX1), channel selection filter two
(BPF2), summing circuit two (∑ 2), programmable gain amplifier two (PGA2), automatic gain control circuit two (AGC2) and mould
Number converter two (ADC2)；
The GLONASS passages include buffer amplifier (BUF1), intermediate frequency mixer two (IFMIX2), channel selection filter three
(BPF3), summing circuit three (∑ 3), programmable gain amplifier three (PGA3), automatic gain control circuit three (AGC3) and mould
Number converter three (ADC3)；
The buffer amplifier (BUF1) receives the signal of RF mixer (RFMIX) output, carries out Hyblid Buffer Amplifier processing
Afterwards, intermediate frequency mixer one (IFMIX1) and intermediate frequency mixer two (IFMIX2) are output to；
The intermediate frequency mixer one (IFMIX1), intermediate frequency mixer two (IFMIX2) are used to be utilized respectively the second local oscillation signal
(LO2), the 3rd local oscillation signal (LO3) carries out double conversion processing to received signal, and the signal after frequency conversion is respectively outputted to letter
Road selection wave filter two (BPF2) and channel selection filter three (BPF3)；
By setting the bandwidth of wave filter, the needs filtered out in bandwidth are demodulated the channel selection filter one (BPF1)
GPS and Galileo intermediate-freuqncy signals, be output to summing circuit one (∑ 1)；
By setting the bandwidth of wave filter, the needs filtered out in bandwidth are demodulated the channel selection filter two (BPF2)
BeiDou intermediate-freuqncy signals, be output to summing circuit two (∑ 2)；
By setting the bandwidth of wave filter, the needs filtered out in bandwidth are demodulated the channel selection filter three (BPF3)
GLONASS intermediate-freuqncy signals, be output to summing circuit three (∑ 3)；
The summing circuit one (∑ 1), summing circuit two (∑ 2) and summing circuit three (∑ 3) respectively carry out received signal
After summation operation realizes that mirror image suppresses, the programmable gain amplifier one (PGA1), programmable automation controller are respectively outputted to
Device two (PGA2) and programmable gain amplifier three (PGA3)；
The programmable gain amplifier one (PGA1), programmable gain amplifier two (PGA2), programmable gain amplifier three
(PGA3) it is used to be amplified the intermediate-freuqncy signal after frequency conversion, and respectively by automatic gain control circuit one (AGC1), automatic
Gain control circuit two (AGC2) and automatic gain control circuit three (AGC3) make respective stable output signal in certain width
In the range of degree, then it is respectively outputted to analog-digital converter one (ADC1), analog-digital converter two (ADC2) and analog-digital converter three
(ADC3)；
The analog-digital converter one (ADC1), analog-digital converter two (ADC2) and analog-digital converter three (ADC3) are used for received
Signal carries out digital quantization, and Buffer output is resolved to GNSS base band.
3. the parallel GNSS radio-frequency transmitters of four moulds triple channel according to claim 1 or 2, it is characterised in that：The receiver
Frequency synthesizer (PLL) is inside additionally provided with, which provides local oscillation signal for receiving channel；It is and same by full duplex
Walk Serial Peripheral Interface (SPI) (SPI) and register configuration is carried out to frequency synthesizer (PLL), to control frequency synthesizer (PLL) to carry out
Frequency handover.
4. the parallel GNSS radio-frequency transmitters of four moulds triple channel according to claim 3, it is characterised in that：The frequency synthesizer
Including reference buffer (BUF3), parametric frequency divider (DIV1), prescalar (DIV2), counter (M/A), phase frequency detector
(PFD), charge pump (CP), voltage controlled oscillator (VCO), local oscillator frequency divider (DIV4, DIV5) and fractional frequency division modulator (∑ △).
The reference buffer (BUF3) receives external crystal oscillator signal, and reference point is output to after being amplified Shape correction
Frequency device (DIV1)；
After parametric frequency divider (DIV1) carries out scaling down processing to received reference signal, through phase frequency detector (PFD) and charge pump
(CP) low-pass filter (LPF) is output to after circuit is handled；
After low-pass filter (LPF) is filtered the output voltage of charge pump (CP), produces a stable DC and put down pair
The frequency of oscillation of voltage controlled oscillator (VCO) is controlled, and provides the first local oscillation signal (LO1) for RF mixer (RFMIX), together
When output signals to VCO buffer amplifiers (BUF2)；
After the signal that VCO buffer amplifiers (BUF2) produce voltage controlled oscillator (VCO) carries out Hyblid Buffer Amplifier processing, pass through respectively
Local oscillator frequency divider one (DIV5) and local oscillator frequency divider two (DIV4) provide the second local oscillation signal for intermediate frequency mixer one (IFMIX1)
(LO2) and for intermediate frequency mixer two (IFMIX2) the 3rd local oscillation signal (LO3) is provided；Meanwhile also pass through prescalar
(DIV2) counter (M/A) is output signals to, fractional frequency division modulator (∑ △) realizes decimal to counter (M/A) into row interpolation
Frequency dividing ratio；
Prescalar (DIV2) carries out multi-mode programmable point with the signal that counter (M/A) produces voltage controlled oscillator (VCO)
Frequency is handled, and is output to phase frequency detector (PFD).
5. the parallel GNSS radio-frequency transmitters of four moulds triple channel according to claim 4, it is characterised in that：The oscillator
(VCO) it is the analog-digital converter one (ADC1), analog-digital converter two (ADC2) and mould also by local oscillator frequency divider three (DIV3)
Number converter three (ADC3) provides sampled clock signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711089632.XA CN107942355A (en) | 2017-11-08 | 2017-11-08 | A kind of parallel GNSS radio-frequency transmitters of four mould triple channels |
Applications Claiming Priority (1)
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| 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 |
| CN111239781A (en) * | 2020-02-28 | 2020-06-05 | 同济大学 | GNSS parallel baseband signal processing method in cluster autonomous collaboration |
| CN111399009A (en) * | 2020-04-08 | 2020-07-10 | 华南理工大学 | Multimode navigation receiving device |
| CN111399008A (en) * | 2020-04-07 | 2020-07-10 | 华南理工大学 | Multi-mode multi-channel navigation receiving device |
| CN111726131A (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 |
| CN113016142A (en) * | 2018-11-14 | 2021-06-22 | 华为技术有限公司 | Down conversion using digital carrier signal |
| CN114826437A (en) * | 2022-03-28 | 2022-07-29 | 上海航天测控通信研究所 | Multifunctional definable rocket-borne comprehensive radio frequency measurement and control device |
| CN115629396A (en) * | 2022-10-09 | 2023-01-20 | 中国科学院国家空间科学中心 | Numerical control attenuation radio frequency front-end equipment of all-civil navigation frequency band |
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