CN105549038B - L1 and L2 two-band satellite navigation receiver RF front-end circuits - Google Patents
L1 and L2 two-band satellite navigation receiver RF front-end circuits Download PDFInfo
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Abstract
The invention discloses a kind of L1 and L2 two-bands satellite navigation receiver RF front-end circuits, mainly it is made of radio frequency low-noise amplifier, first order frequency mixer, second level frequency mixer, low-pass filter, configurable multiple bandpass filter, variable-gain intermediate frequency amplifier, analog-digital converter, frequency synthesizer and 8 frequency dividers, the two-bands satellite-signals such as GPS L1 and L2 signal, the Big Dipper B1 and B2 signal, Glonass L1 and L2 can be received simultaneously, meet the needs of high precision double frequency satellite positioning, navigation.Simultaneously, the circuit reduction circuit structure of traditional dual band receiver, single frequency synthesizer is only needed to be received while double frequency segment signal can be realized, and single antenna is supported to input, mirror image inhibition is carried out without using radio frequency, intermediate-frequency filter outside piece, the power consumption and cost of receiver radio frequency front-end circuit can be effectively reduced, there is higher industrial utilization.
Description
Technical field
The invention belongs to wireless communications chips design field, in particular to satellite navigation receiver radio-frequency front-end electricity
Road.
Background technology
Global Satellite Navigation System (GNSS) can be supplied to the accurate position of user, speed, temporal information, have whole day
The features such as time, global, real-time, high-precision, therefore develop in recent years very rapid.At present, Global Satellite Navigation System master
Will include the U.S. global positioning system (GPS), Russia glonass system (Glonass), European Union Galileo system
(Galileo) and China dipper system (BDS).The satellite of each system earthward can emit multiple carrier frequencies simultaneously
Satellite-signal, such as：For commercial satellite signal, GPS satellite sends L1 (1575.42MHz), L2 (1227.6MHz) simultaneously
Two frequency band signals, GPS satellite of new generation also add the satellite-signal of L5 (1176.45MHz) frequency range；Glonass satellites are same
When send L1 (1602MHz), two frequency band signals of L2 (1246MHz)；E1 (1575.42MHz), E5 occur simultaneously for Galileo satellite
(1176.45MHz and 1207.14MHz) two frequency band signals；Big-dipper satellite sends B1 (1561.098MHz), B2 simultaneously
The signal of (1207.14MHz) two frequency range.If ground satellite receiver can receive two satellites even more than frequency range simultaneously
Signal, it is possible to estimate ionosphere delay time error, improve positioning accuracy, be very helpful for high accuracy positioning application.
At present, most commercial satellite navigation neceivers can only receive the satellite letter of single frequency band for the considerations of cost and power consumption
Number, positioning accuracy is not also generally very high.And the cost of existing dual band receiver is still more high, ordinary user can not hold
By.With the continuous development of information technology, the demand of high-precision applications can be more and more, and there is an urgent need to reduce two-band satellite to lead
The cost and power consumption of boat receiver, in order to be integrated in individual terminal devices.And RF front-end circuit is satellite navigation reception
Key modules in machine, it has very big influence to the performance, power consumption and cost of entire receiver.
RF front-end circuit in traditional dual band receiver is generally made of two independent radio frequency reception accesses, is such as schemed
Shown in 1, every access all contains complete receiver components, generally comprises radio frequency low-noise amplifier LNA 10/11, mixing
Device 20/21, wave filter 50/51, intermediate frequency amplifier 60/61, analog-digital converter ADC 70/71 and frequency synthesizer 80/81 etc..
It is clear that the circuit overhead of this dual band receiver is twice of single frequency receiving, and double antenna is needed to input, cost
It is higher with power consumption.In addition, two frequency synthesizers are operated at different rf frequencies, easily generate and interfere with each other.In order to drop
The cost and power consumption of low radio frequency front-end circuit improve stability, and existing document proposes some improved methods at present.It is for example, Chinese
Patent of invention CN200710107693.4 propose " using unipath radio-frequency front-end realize the method that receives parallel of GNSS multimodes and
Device " using the method for periodically switching reception pattern, realizes the function of mono-channel radio-frequency front end receiver multi-mode signal.But
It is that this method has some problems in practical engineering application, lacks feasibility, such as：In the satellite for receiving different frequency
During signal, need to switch the local oscillation signal of different frequency, if realized using multiple frequency synthesizers, cost and work(can be increased
Consumption, if realized using single frequency synthesizer, phaselocked loop needs longer stabilization time during switching frequency, general up to several micro-
Second to tens microseconds.In addition, radio frequency analog circuit longer stabilization time is also required to during pattern switching could be normally
Work.Therefore it is difficult to realize the design philosophy of the invention in practical applications, has not seen the example of application.Chinese invention patent Shen
Please CN201010620937.0 propose " a kind of single-chip dual-frequency global satellite navigation receiver ", satellite navigation signals are divided into
The frequency separation of two image signals each other, two receiving channels receive the signal in different frequency section respectively, two receive it is logical
Road shares two frequency synthesizers, is received while realizing double frequency satellite navigation signals.When receiving double frequency segment signal, the hair
Two radio band frequency synthesizers are only changed to share a radio frequency by bright circuit structure compared with structure shown in FIG. 1
Band frequency synthesizer (1.10GHz~1.61GHz) and a Mid Frequency frequency synthesizer (150MHz~220MHz) are each to receive
Machine access is changed to the receiver of superhet, needs using passive intermediate-frequency filter outside piece, without cost advantage.In addition,
During practical application, two receiver radio frequency input terminals must all increase radio-frequency filter carry out image frequency inhibition, otherwise without
Method reaches preferable receiving sensitivity performance.Chinese invention patent CN201010206235.8 proposes a kind of " dual-system and dual-frequency
The circuit and Chinese invention patent application of two-band reception are realized in navigation neceiver radio frequency front-end device ", the invention
The circuit structure that CN201010620937.0 is proposed is similar, also uses superhet double conversion technology, difference is two-band
Signal has shared radio frequency low-noise amplifier and first order frequency mixer, and second level local oscillation signal is divided by first order local oscillation signal and produced
It is raw, save the frequency synthesizer for generating intermediate frequency local oscillator signal.Likewise, the circuit is also required in the application in rf inputs
Increase the inhibition that radio-frequency filter carries out image frequency, otherwise can not inhibit the interference of noise at image frequency, cause to receive spirit
The decline of sensitivity.But since the circuit has shared rf inputs all the way when receiving double frequency segment signal, so again to selection
Suitable radio-frequency filter causes certain difficulty, therefore does not also have very strong practicability.
In conclusion the existing receiver radio frequency front-end circuit that can receive two-band satellite navigation signals simultaneously or can not
It realizes relatively low cost and power consumption or does not have feasibility in practical application, low cost, low-power consumption, two-band can not be met
The application demand that satellite-signal receives simultaneously.
Invention content
The main object of the present invention is on the basis of receiving L1 and L2 two-band satellite navigation signals at the same time, and realization need not
Using radio frequency, intermediate-frequency filter and the function that single antenna is supported to input outside piece, solution available circuit is complicated, of high cost, work(
Consume the problem of big.
To achieve the above object, the present invention proposes a kind of two-band satellite navigation receiver RF front-end circuit, electricity
Line structure following module as shown in Fig. 2, be made of：
(1) radio frequency low-noise amplifier (LNA) 10, input is receives radiofrequency signal, amplified output radiofrequency signal
A connects first order frequency mixer 20；
(2) first order frequency mixer 20, input radio frequency signal A, respectively with I roads the first local oscillation signal LO1_I and Q roads first
Local oscillation signal LO1_Q is mixed, and signal A is down-converted to the first IF frequency by rf frequency, i.e.,：A and LO1_I mixing is defeated
Go out I roads the first intermediate-freuqncy signal B1, A and LO1_Q mixing output Q roads the first intermediate-freuqncy signal B2, B1 and B2 and connect second level frequency mixer 30；
Wherein, the I roads, Q roads are signal path, and usually, I roads are the signal path that phase is 0 degree, and Q roads are that phase is 90 degree
Signal path；
(3) second level frequency mixer 30, input for the first intermediate-freuqncy signal B1, B2 of I, Q two-way, respectively with the second local oscillator of I roads
Signal LO2_I and Q roads the second local oscillation signal LO2_Q is mixed, during the first IF signal frequency is down-converted to second again and again
Rate, i.e.,：The second intermediate frequency of B1 and LO2_I mixing output first via II roads the second intermediate-freuqncy signal C1, B1 and LO2_Q mixing output IQ roads
The second intermediate-freuqncy signal of signal C2, B2 and LO2_I mixing output QI roads the second intermediate-freuqncy signal C3, B2 and LO2_Q mixing output QQ roads
C4, second intermediate-freuqncy signal C1, C2, C3, C4 connect low-pass filter 40；
(4) low-pass filter 40, input for II, IQ, QI, QQ tetra- tunnel the second intermediate-freuqncy signal C1, C2, C3, C4, to its into
Row signal synthesizes and low-pass filtering, i.e.,：C1-C4 and low-pass filtered rear I roads third intermediate-freuqncy signal D1, C2+ as channel one
C3 and it is low-pass filtered after as channel one Q roads third intermediate-freuqncy signal D2, C3-C2 and it is low-pass filtered afterwards as channel two
Q roads third intermediate-freuqncy signal D3, C1+C4 and the low-pass filtered rear I roads third intermediate-freuqncy signal D4 as channel two, by above-mentioned place
Reason, channel one filter out the signal of L1 frequency ranges, inhibit L2 frequency band signals, and channel two filters out the signal of L2 frequency ranges, inhibits L1 frequencies
The signal of section, realizes the separation of different frequency range signal, while low-pass filter plays suppression to high-frequency noise and interference signal
It makes and uses, output signal D1, D2 connects the configurable multiple bandpass filter 50 in road one, and D3, D4 connect the configurable multiple band in road two
Bandpass filter 51；
(5) the configurable multiple bandpass filter 50 of channel one, input are the I roads third intermediate-freuqncy signal D1 of channel one and lead to
The Q roads third intermediate-freuqncy signal D2 in road one, plural bandpass filtering is carried out to it, filters out image frequency, output channel one the 4th in
Frequency signal E1, connects variable-gain intermediate frequency amplifier 60；
(6) the configurable multiple bandpass filter 51 of channel two, input are the Q roads third intermediate-freuqncy signal D3 of channel two and lead to
The I roads third intermediate-freuqncy signal D4 in road two, plural bandpass filtering is carried out to it, filters out image frequency, output channel two the 4th in
Frequency signal E2, connects variable-gain intermediate frequency amplifier 61；
(7) the variable-gain intermediate frequency amplifier 60 of channel one, input for channel one the 4th intermediate-freuqncy signal E1, to its into
Row amplification, the 5th intermediate-freuqncy signal F1 of output channel one connect the analog-digital converter (ADC) 70 in road one；
(8) the variable-gain intermediate frequency amplifier 61 of channel two, input for channel two the 4th intermediate-freuqncy signal E2, to its into
Row amplification, the 5th intermediate-freuqncy signal F2 of output channel two connect the ADC 71 in road two；
(9) ADC 70, fiveth intermediate-freuqncy signal F1 of the input for channel one, are converted into one digital signal of channel and defeated
Go out；
(10) ADC 71, fiveth intermediate-freuqncy signal F2 of the input for channel two, are converted into channel two digital signal simultaneously
Output；
(11) frequency synthesizer 80 generate I, Q two-way the first local oscillation signal LO1_I and LO1_Q, are output to the first frequency mixer
20；
(12) 8 frequency dividers 90, the first local oscillation signal LO1_I or LO2_Q that input is generated for frequency synthesizer 80, to it
8 frequency dividings are carried out, I, Q two-way the second local oscillation signal LO2_I and LO2_Q of 1/8 times of first local oscillator signal frequency is generated, is output to the
Two frequency mixers 30.
Wherein, radio frequency low-noise amplifier 10 can receive L1, L2 two-band satellite navigation signals simultaneously, for example, GPS L1 and
L2 signals, the Big Dipper B1 and B2 signal, Glonass L1 and L2 signals etc..First order frequency mixer 20 be by two sub- frequency mixers 201,
I, Q orthogonal mixer of 202 compositions, for radiofrequency signal to be down-converted to the first IF frequency.Second level frequency mixer 30 is by four
A sub- frequency mixer 301,302,303,304 forms, and sub- frequency mixer 301 and 302 forms I, Q orthogonal mixer all the way, sub- frequency mixer
303 and 304 composition another way I, Q orthogonal mixers, for the first IF frequency signal to be down-converted to the second IF frequency.It is low
Bandpass filter 40 is made of four subfilters 401,402,403,404, and the synthesis of two-way input signal and low can be achieved
The function of pass filter achievees the purpose that detach different frequency range signal and inhibits high-frequency noise.Radio frequency low-noise amplifier 10,
Different circuits may be used in level-one frequency mixer 20, second level frequency mixer 30 and the low-pass filter 40 with signal complex functionality
Type is realized.For example, above-mentioned several modules can all use voltage mode (control source, voltage output) to work, can also incite somebody to action
Radio frequency low-noise amplifier 10 is designed as transconductance mode (control source, electric current output), at this point, first order frequency mixer 20 and second
Grade frequency mixer 30 is current-mode (electric current input, electric current output), and low-pass filter 40 is across resistance pattern (electric current input, voltage
Output).Configurable multiple bandpass filter 50,51 realizes plural band-pass filtering function, for filtering out image frequency and out-of-band interference,
Its filter parameter can be configured, such as passband central frequency, pass band width etc..Variable-gain intermediate frequency amplifier 60,61
4th IF frequency signal can be amplified, gain amplifier can be controlled by automatic gain control loop respectively, make its defeated
The amplitude for going out intermediate-freuqncy signal reaches the required range of ADC70,71 normal works, the range required by the normal work by
ADC self-characteristics are determined, such as the precision of ADC or ADC maximum input ranges etc..The function of variable-gain intermediate frequency amplifier
It prime can also be merged into can configure and be realized in multiple bandpass filter 50,51, multiple bandpass filter 50,51 is designed to that gain can
The pattern of change can thus dispense variable-gain intermediate frequency amplifier module, reduce circuit scale.Needed for first order frequency mixer 20
I, Q two-way the first local oscillation signal LO1_I and LO1_Q generated by frequency synthesizer 80.I, Q two-way needed for second frequency mixer 30
Second local oscillation signal LO2_I and LO2_Q is that the first local oscillation signal LO1_I (or LO1_Q) is divided by 8 frequency dividers to generate,
Frequency is 1/8 times of the first local oscillator signal frequency.
The concrete operating principle of the circuit is as follows：
As shown in Fig. 2, the two-band satellite navigation signals that antenna receives initially enter radio frequency low-noise amplifier 10, connect
The collection of letters number is amplified the noise contribution so as to reduce post-module generation.Following low noise amplifier output signal A needs
It is further processed by being down-converted to IF frequency.
The operation principle of down coversion part is as shown in figure 3, first local oscillation signal LO1_I, LO1_Q can use cos respectively
(ω1And sin (ω t)1T) it represents, second local oscillation signal LO2_I, LO2_Q can use cos (ω respectively2And sin (ω t)2T) table
Show, wherein ω1And ω2The respectively angular frequency of the first and second local oscillation signals.First local oscillator signal frequency can be generally configured as L1
The centre of band satellite signal(-) carrier frequency and L2 band satellite signal(-) carrier frequencies, the second local oscillation signal frequency are the first local oscillator
The 1/8 of signal frequency, specific set of frequency can be with the set of frequency schemes in reference table 1.Signal A is defeated after down coversion twice
Signal C1, C2, C3, the C4 gone out can be then expressed as：
C1, C2, C3, C4 carry out the synthesis of signal by the low-pass filter 40 with signal complex functionality again：
C1-C4=A cos [(ω1+ω2)t] (2a)
C2+C3=A sin [(ω1+ω2)t] (2b)
C1+C4=A cos [(ω1-ω2)t] (2c)
C3-C2=A sin [(ω1-ω2)t] (2d)
Because ω2=ω1/ 8, so having：
It can be seen that, by down coversion twice and signal synthesis after, C1-C4 and C2+C3 signals be equivalent to input signal A with
9/8 times of the first local oscillator signal frequency ω1Orthogonal mixing is exported as one signal of channel.C1+C4 and C3-C2 signals are equivalent to
Input signal A and 7/8 times of the first local oscillator signal frequency ω1Orthogonal mixing is exported as channel binary signal.Due to input signal
A had not only contained the higher L1 frequency band signals of frequency, but also contained the relatively low L2 frequency band signals of frequency, if choosing suitable first
Local oscillation signal frequency, then L1 frequency band signals can be down converted to relatively low IF frequency in channel one, and L2 frequency band signals exist
Channel two can be down converted to relatively low IF frequency, be received while thereby realizing L1 and L2 navigation signals.Table 1 arranges
Several typical frequency planning schemes are lifted.
The synthesis of the double conversion and signal of above-mentioned radio-frequency front-end can not only realize and be received while double frequency segment signal,
But also the function of mirror image inhibition is realized simultaneously.The theoretically low intermediate frequency receiver of double conversion, there are 3 mirrors for useful signal
Picture frequency rate, and can see from formula (3a)~(3b), after the receiver circuit structure, useful signal, which is equivalent to, only to carry out
Down coversion, therefore RF front-end circuit shown in Fig. 2 can be equivalent to circuit structure shown in Fig. 4, such receiver
It need to only be inhibited for an image frequency.In fact, the image frequency that receiver first time frequency conversion generates is cancelled, only
There are the image frequency needs that second of frequency conversion generates to be handled in rear class answers bandpass filter.
1 receiver radio frequency front-end circuit set of frequency scheme of table is illustrated
| GPS L1+L2 | BDS B1+B2 | Glonass L1+L2 | |
| L1 band satellite signal frequencies | 1575.42MHz | 1561.098MHz | 1602MHz |
| L2 band satellite signal frequencies | 1227.6MHz | 1207.14MHz | 1246MHz |
| First local oscillator signal frequency | 1396.85MHz | 1384.12MHz | 1416.25MHz |
| Second local oscillation signal frequency | 174.61MHz | 173.02MHz | 177.03MHz |
| IF frequency (channel one) after L1 signal double conversions | 3.96MHz | 3.96MHz | 8.44MHz |
| IF frequency (channel two) after L2 signal double conversions | 5.36MHz | -3.97MHz | 6.78MHz |
Low-pass filter 401,402,403,404 can be filtered the intermediate-freuqncy signal after down coversion, filter out high-frequency noise
And interference signal, mitigate the linearity of late-class circuit.Configurable multiple bandpass filter 50,51 realizes the suppression of image frequency
System, and further filter out high-frequency noise and interference signal.Its passband central frequency, pass band width can be according to reception signals not
Together, it is configured and is adjusted.Variable-gain intermediate frequency amplifier 60,61 and analog-digital converter 70,71 are respectively completed signal amplification
With the function of analog-to-digital conversion, it is sent to digital baseband processor and carries out further signal processing.Thereby realize entire radio frequency
The function of front-end circuit.
In conclusion RF front-end circuit disclosed by the invention has an advantageous effect in that：The circuit reduction is traditional double
The circuit structure of band receiver radio-frequency front-end only needs single frequency synthesizer to be connect while two-band satellite-signal can be realized
It receives, and single antenna is supported to input, can be realized without using passive intermediate-frequency filter outside radio-frequency filter outside piece or piece to mirror
The inhibition of picture frequency rate can effectively reduce the power consumption and cost of receiver radio frequency front-end circuit, have higher industry exploitation value
Value.
It should be noted that RF front-end circuit disclosed by the invention is not to the physical circuit realization side of each submodule
Formula has special restriction, as long as realizing that the present invention can be realized in the function of aforementioned modules.Therefore, to each submodule physical circuit
Change, optimization of realization method etc. do not change the essence of the present invention, should cover in holding within the present invention.
Description of the drawings
Fig. 1 is traditional two-band RF front-end circuit structure chart.
Fig. 2 is two-band RF front-end circuit structure chart of the present invention.
Fig. 3 is the schematic diagram of RF front-end circuit signal down coversion part of the present invention.
Fig. 4 is the equivalent circuit schematic of RF front-end circuit of the present invention.
Specific embodiment
A kind of preferred embodiment of the present invention is as follows：
As shown in Fig. 2, dual band receiver RF front-end circuit consists of the following parts：
(1) radio frequency low-noise amplifier 10, input connect the to receive radiofrequency signal, amplified output radiofrequency signal A
Level-one frequency mixer 20；
(2) first order frequency mixer 20, input radio frequency signal A, respectively with one I roads the first local oscillation signal LO1_I of channel and
Two channel Q roads the first local oscillation signal LO1_Q are mixed, and signal A are down-converted to the first IF frequency by rf frequency, i.e.,：A
Output I roads the first intermediate-freuqncy signal B1, A and LO1_Q mixing is mixed with LO1_I exports Q roads the first intermediate-freuqncy signal B2, B1 and B2 connect the
Two level frequency mixer 30；
(3) second level frequency mixer 30, input for the first intermediate-freuqncy signal B1, B2 of I, Q two-way, respectively with the second local oscillator of I roads
Signal LO2_I and Q roads the second local oscillation signal LO2_Q is mixed, during the first IF signal frequency is down-converted to second again and again
Rate, i.e.,：The second intermediate-freuqncy signal of B1 and LO2_I mixing output II roads the second intermediate-freuqncy signal C1, B1 and LO2_Q mixing output IQ roads
C2, B2 and LO2_I mixing output QI roads the second intermediate-freuqncy signal C3, B2 and LO2_Q mixing output QQ road the second intermediate-freuqncy signal C4, the
Two intermediate-freuqncy signal C1, C2, C3, C4 connect low-pass filter 40；
(4) low-pass filter 40, input for II, IQ, QI, QQ tetra- tunnel the second intermediate-freuqncy signal C1, C2, C3, C4, to its into
Row signal synthesizes and low-pass filtering, i.e.,：C1-C4 and low-pass filtered rear I roads third intermediate-freuqncy signal D1, C2+ as channel one
C3 and it is low-pass filtered after as channel one Q roads third intermediate-freuqncy signal D2, C3-C2 and it is low-pass filtered afterwards as channel two
Q roads third intermediate-freuqncy signal D3, C1+C4 and the low-pass filtered rear I roads third intermediate-freuqncy signal D4 as channel two, by above-mentioned place
Reason, channel one filter out the signal of L1 frequency ranges, inhibit L2 frequency band signals, and channel two filters out the signal of L2 frequency ranges, inhibits L1 frequencies
The signal of section, realizes the separation of different frequency range signal, while low-pass filter plays suppression to high-frequency noise and interference signal
It makes and uses, output signal D1, D2 connects the configurable multiple bandpass filter 50 in road one, and D3, D4 connect the configurable multiple band in road two
Bandpass filter 51；
(5) the configurable multiple bandpass filter 50 of channel one, input are the I roads third intermediate-freuqncy signal D1 of channel one and lead to
The Q roads third intermediate-freuqncy signal D2 in road one, plural bandpass filtering is carried out to it, filters out image frequency, output channel one the 4th in
Frequency signal E1, connects variable-gain intermediate frequency amplifier 60；
(6) the configurable multiple bandpass filter 51 of channel two, input are the Q roads third intermediate-freuqncy signal D3 of channel two and lead to
The I roads third intermediate-freuqncy signal D4 in road two, plural bandpass filtering is carried out to it, filters out image frequency, output channel two the 4th in
Frequency signal E2, connects variable-gain intermediate frequency amplifier 61；
(7) the variable-gain intermediate frequency amplifier 60 of channel one, input for channel one the 4th intermediate-freuqncy signal E1, to its into
Row amplification, the 5th intermediate-freuqncy signal F1 of output channel one connect the ADC 70 in road one；
(8) the variable-gain intermediate frequency amplifier 61 of channel two, input for channel two the 4th intermediate-freuqncy signal E2, to its into
Row amplification, the 5th intermediate-freuqncy signal F2 of output channel two connect the ADC 71 in road two；
(9) ADC 70, fiveth intermediate-freuqncy signal F1 of the input for channel one, are converted into one digital signal of channel and defeated
Go out；
(10) ADC 71, fiveth intermediate-freuqncy signal F2 of the input for channel two, are converted into channel two digital signal simultaneously
Output；
(11) frequency synthesizer 80 generate I, Q two-way the first local oscillation signal LO1_I and LO1_Q, are output to the first frequency mixer
20；
(12) 8 frequency dividers 90, the first local oscillation signal LO1_I that input is generated for frequency synthesizer 80,8 points are carried out to it
Frequently, I, Q two-way the second local oscillation signal LO2_I and LO2_Q of 1/8 times of first local oscillator signal frequency are generated, is output to the second mixing
Device 30.
Wherein, radio frequency low-noise amplifier (LNA) 10 can receive L1, L2 two-band satellite navigation signals simultaneously, using across
Waveguide mode.I, Q orthogonal mixer that first order frequency mixer 20 is made of two sub- frequency mixers 201,202, for radio frequency to be believed
Number the first IF frequency is down-converted to, using current-mode.Second level frequency mixer 30 by four sub- frequency mixers 301,302,303,
304 compositions, I, Q orthogonal mixer, sub- frequency mixer 303 and 304 are forming another way I, Q just to the sub- composition of frequency mixer 301 and 302 all the way
Frequency mixer is handed over, for the first IF frequency signal to be down-converted to the second IF frequency, using current-mode.It is synthesized with signal
The low-pass filter 40 of function is made of four subfilters 401,402,403,404, can be achieved to two-way input signal
Synthesis and low-pass filtering function, using across resistance pattern.Configurable multiple bandpass filter 50,51 realizes plural bandpass filtering work(
Can, for filtering out image frequency and out-of-band interference, filter parameter can be configured, such as passband central frequency, passband
Bandwidth etc..Variable-gain intermediate frequency amplifier 60,61 can be amplified IF frequency signal, and gain amplifier can be respectively by automatic
Gain control loop controls, it is made to export the amplitude of intermediate-freuqncy signal, and to reach analog-digital converter 70,71 normal work required
Range.I, Q two-way the first local oscillation signal LO1_I and LO1_Q needed for first order frequency mixer 20 is generated by frequency synthesizer 80.The
I, Q two-way the second local oscillation signal LO2_I and LO2_Q needed for two frequency mixers 30 is to the first local oscillation signal LO1_I by 8 frequency dividers
What frequency dividing generated, output frequency is 1/8 times of the first local oscillator signal frequency.According to the difference for receiving satellite system, can adjust
The frequency of first local oscillation signal, specific set of frequency can refer to table 1 and realize.
Claims (9)
1. a kind of L1 and L2 two-bands satellite navigation receiver RF front-end circuit, which is characterized in that the circuit includes：
The input of radio frequency low-noise amplifier LNA, the radio frequency low-noise amplifier LNA are amplified to receive radiofrequency signal
Export the output connection first order frequency mixer of radiofrequency signal A, the radio frequency low-noise amplifier LNA；
First order frequency mixer, the input of the first order frequency mixer for radiofrequency signal A, the radiofrequency signal A respectively with I, Q two-way
First local oscillation signal LO1_I, LO1_Q is mixed, and signal A is down-converted to the first IF frequency by rf frequency, wherein, institute
It states radiofrequency signal A and LO1_I mixing output I road the first intermediate-freuqncy signal B1, the radiofrequency signal A and LO2_Q mixing and exports Q roads the
One intermediate-freuqncy signal B2, I roads the first intermediate-freuqncy signal B1 and the first intermediate-freuqncy signal of Q roads B2 are sent to second level frequency mixer；
Second level frequency mixer, the input of the second level frequency mixer are the first intermediate-freuqncy signal B1, B2 of I, Q two-way, respectively with I, Q two
Second local oscillation signal LO2_I, LO2_Q are mixed on road, during input signal is down-converted to second by the first IF frequency again and again
Rate, wherein, the second intermediate frequency of I roads the first intermediate-freuqncy signal B1 and the second local oscillation signal of I roads LO2_I mixing output II roads is believed
The second intermediate-freuqncy signal of number C1, I roads the first intermediate-freuqncy signal B1 and the second local oscillation signal of Q roads LO2_Q mixing output IQ roads
C2, Q roads the first intermediate-freuqncy signal B2 and the second local oscillation signal of I roads LO2_I mixing output QI road the second intermediate-freuqncy signal C3,
Q roads the first intermediate-freuqncy signal B2 and the second local oscillation signal of Q roads LO2_Q mixing exports QQ road the second intermediate-freuqncy signal C4, defeated
Go out second intermediate-freuqncy signal C1, C2, C3, C4 and connect low-pass filter；
Low-pass filter, the low-pass filter are the low-pass filter with signal complex functionality, the low-pass filter
It inputs as II, IQ, QI, QQ tetra- tunnel the second intermediate-freuqncy signal C1, C2, C3, C4, the low-pass filter is by four subfilter structures
Into each subfilter is used for the progress signal synthesis of two-way input signal and low-pass filtering, wherein C1-C4 and through low pass
After filtering in the Q roads third of I roads third the intermediate-freuqncy signal D1, C2+C3 of output channel one and low-pass filtered rear output channel one
Frequency signal D2, C3-C2 and it is low-pass filtered after output channel two Q roads third intermediate-freuqncy signal D3, C1+C4 and it is low-pass filtered after
The I roads third intermediate-freuqncy signal D4 of output channel two, third intermediate-freuqncy signal D1, D2 are sent to the configurable multiple band logical of channel one
Wave filter, third intermediate-freuqncy signal D3, D4 are sent to the configurable multiple bandpass filter of channel two；
The configurable multiple bandpass filter of channel one, the input of the configurable multiple bandpass filter of the channel one is channel one
I, Q two-way third intermediate-freuqncy signal D1, D2, the configurable multiple bandpass filter of the channel one are used for the third intermediate-freuqncy signal
D1, D2 carry out plural bandpass filtering, and the 4th intermediate-freuqncy signal E1 of output channel one, the 4th intermediate-freuqncy signal E1 are sent to variable
Gain intermediate frequency amplifier；
The configurable multiple bandpass filter of channel two, the input of the configurable multiple bandpass filter of the channel two is tool channel two
I, Q two-way third intermediate-freuqncy signal D3, D4, the configurable multiple bandpass filter of the channel two is to the third intermediate-freuqncy signal
D3, D4 carry out plural bandpass filtering, and the 4th intermediate-freuqncy signal E2 of output channel two, the 4th intermediate-freuqncy signal E2 are sent to variable
Gain intermediate frequency amplifier；
The variable-gain intermediate frequency amplifier of channel one, fourth intermediate-freuqncy signal E1 of the input for channel one, to the 4th intermediate frequency
Signal E1 is amplified, and the 5th intermediate-freuqncy signal F1 of output channel one, the 5th intermediate-freuqncy signal F1 are sent to the mould of channel one
Number converter ADC；
The variable-gain intermediate frequency amplifier of channel two, fourth intermediate-freuqncy signal E2 of the input for channel two, to the 4th intermediate frequency
Signal E2 is amplified, and the 5th intermediate-freuqncy signal F2 of output channel two, the 5th intermediate-freuqncy signal is sent to the ADC of channel two；
The ADC of channel one, fiveth intermediate-freuqncy signal F1 of the input for channel one, number is converted to by the 5th intermediate-freuqncy signal F1
Signal simultaneously exports；The channel one can filter out the signal of L1 frequency ranges, inhibit the signal of L2 frequency ranges；
The ADC of channel two, fiveth intermediate-freuqncy signal F2 of the input for channel two, digital letter is converted to by the 5th intermediate-freuqncy signal
Number and export；The channel two can filter out the signal of L2 frequency ranges, inhibit the signal of L1 frequency ranges；
Frequency synthesizer generates I, Q two-way the first local oscillation signal LO1_I and LO1_Q, is output to the first order frequency mixer；
8 frequency dividers, the first local oscillation signal LO1_I or LO2_Q that input is generated for frequency synthesizer believe first local oscillator
Number LO1_I or LO2_Q carries out 8 frequency dividings, generate I, Q 1/8 times of first local oscillator signal frequency of two-way the second local oscillation signal LO2_I and
LO2_Q is output to the second level frequency mixer.
2. circuit according to claim 1, which is characterized in that the radio frequency low-noise amplifier receives L1, L2 two-band
Satellite navigation signals：GPSL1 and L2 frequency band signals, the Big Dipper B1 and B2 frequency band signals, GlonassL1 and L2 frequency band signals.
3. circuit according to claim 1, which is characterized in that the first order frequency mixer is made of two sub- frequency mixers,
For radiofrequency signal to be down-converted to the first IF frequency.
4. circuit according to claim 1, which is characterized in that the second level frequency mixer is made of four sub- frequency mixers,
Combination of two is into orthogonal mixer all the way, for the first IF frequency to be down-converted to the second IF frequency.
5. circuit according to claim 1, which is characterized in that the configurable multiple bandpass filter and channel of the channel one
Two configurable multiple bandpass filter is used for plural bandpass filtering, and filter parameter can be configured, the filter parameter
Including passband central frequency, pass band width.
6. circuit according to any one of claims 1 to 5, which is characterized in that the radio frequency low-noise amplifier, the first order are mixed
Frequency device, second level frequency mixer and low-pass filter use voltage mode.
7. circuit according to any one of claims 1 to 5, which is characterized in that the radio frequency low-noise amplifier uses mutual conductance
Pattern, the first order frequency mixer and second level frequency mixer use current-mode, and the low-pass filter is used across resistance pattern.
8. circuit according to claim 1, which is characterized in that the variable-gain intermediate frequency that the circuit can omit channel one is put
The variable-gain intermediate frequency amplifier of big device and channel two, the function of variable gain amplification can be by the configurable multiple of prime channel one
The configurable multiple bandpass filter of bandpass filter and channel two is realized.
9. circuit according to claim 1, which is characterized in that the second local oscillation signal frequency is the first local oscillation signal frequency
The 1/8 of rate.
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| CN106547007B (en) * | 2017-01-17 | 2023-06-16 | 上海迦美信芯通讯技术有限公司 | Dual-channel multimode navigation radio frequency receiving circuit |
| CN108809342A (en) * | 2018-06-11 | 2018-11-13 | 中国人民解放军空军工程大学 | A kind of signal processing system with fast signal processing |
| CN108872925B (en) * | 2018-07-24 | 2023-06-02 | 广州比逊电子科技有限公司 | Four-channel multi-frequency-band satellite navigation signal receiver |
| CN109039429B (en) * | 2018-08-17 | 2021-01-26 | 浙江金波电子有限公司 | Signal processing method for satellite communication |
| CN109474294B (en) * | 2018-12-24 | 2024-01-23 | 南京屹信航天科技有限公司 | Uplink channel circuit for satellite-borne measurement and control equipment |
| CN111384986A (en) * | 2018-12-31 | 2020-07-07 | 浙江英特讯信息科技有限公司 | Intelligent communication management terminal |
| CN110391821A (en) * | 2019-08-21 | 2019-10-29 | 华讯方舟科技（湖北）有限公司 | A kind of signal receiving circuit and satellite signal receiving equipment |
| CN113037307B (en) * | 2019-12-09 | 2022-07-08 | 北京合众思壮科技股份有限公司 | Satellite receiver chip and satellite receiver system |
| 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 |
| CN111245450A (en) * | 2020-03-13 | 2020-06-05 | 华为技术有限公司 | Intelligent wearable device |
| CN112073073B (en) * | 2020-06-11 | 2022-08-09 | 北斗天地股份有限公司 | Radio frequency signal processing method and device for radio frequency receiver |
| US11754723B2 (en) * | 2021-09-29 | 2023-09-12 | Qualcomm Incorporated | Dynamic radio frequency receive chain control |
| CN117890937B (en) * | 2024-03-15 | 2024-05-10 | 北京凯芯微科技有限公司 | Radio frequency front end of satellite navigation system, receiver and electronic equipment |
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| FR2944399B1 (en) * | 2009-04-10 | 2011-06-03 | Thales Sa | MULTI-FREQUENCY RECEIVER FOR SATELLITE LOCATION |
| CN101915932B (en) * | 2010-06-12 | 2012-07-25 | 北京航空航天大学 | Radio frequency front-end device for dual-system and dual-frequency navigation receiver |
| CN103209147B (en) * | 2013-03-25 | 2015-10-21 | 电子科技大学 | A kind of multiband millimeter wave receiver and method |
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