CN104734640B - A kind of frequency changer circuit and receiver board - Google Patents
A kind of frequency changer circuit and receiver board Download PDFInfo
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- CN104734640B CN104734640B CN201510100756.8A CN201510100756A CN104734640B CN 104734640 B CN104734640 B CN 104734640B CN 201510100756 A CN201510100756 A CN 201510100756A CN 104734640 B CN104734640 B CN 104734640B
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Abstract
The embodiment of the invention discloses a kind of frequency changer circuit and receiver boards.Frequency changer circuit provided in an embodiment of the present invention, including：First local oscillation circuit and N number of radio-frequency channel；First local oscillation circuit is connected with the first frequency mixer, the second frequency mixer, the third frequency mixer in each radio-frequency channel, and the first local oscillation signal of generation is inputted into first frequency mixer, second local oscillation signal inputs second frequency mixer and third local oscillation signal inputs the third frequency mixer, and second local oscillation signal differs 90 ° with the third local oscillation signal phase；The radiofrequency signal corresponding with the radio-frequency channel that each radio-frequency channel in N number of radio-frequency channel is used to receive is converted to the roads I and Q roadbeds band signal and exports.The embodiment of the present invention, which is realized, is handled multiple frequency points on a frequency changer circuit, and shares a local oscillation circuit, and hardware resource is greatly saved in the processing of radiofrequency signal for realizing multifrequency point.
Description
Technical field
The present invention relates to satellite navigation and positioning field more particularly to a kind of frequency changer circuits and receiver board.
Background technology
Global position system includes multiple, such as global positioning system (Global Positioning System, GPS systems
System), Beidou satellite navigation system (BeiDou Navigation Satellite System, abbreviation BDS) etc. can be used for guide
The receiver that navigates provides the satellite system of location information.GPS system include at least 24 around the ground period be about 12 hours ground
Ball satellite and several ground control stations.
The major function of navigation neceiver be can capture by certain selected satellite to be measured of satellite angle of cut-off, and with
The operation of these satellites of track.After navigation neceiver captures the satellite-signal of tracking, so that it may measure reception antenna to satellite
Pseudo-distance and distance change rate, demodulate the data such as satellite orbit parameter, obtain satellite navigation message, satellite navigation message
It is made of a series of navigation bit, includes satellite time, clock correction parameter, ionospheric delay model parameter, Satellite
It goes through and the information datas such as satellite health.According to these data, navigation neceiver can be positioned by positioning calculation method
It calculates, calculates the navigator fixs such as longitude and latitude, height and the Position, Velocity and Time of user of user geographic location letter
Breath.
Useful signal is mainly selected from numerous electromagnetic waves in the radio frequency part of wireless communication field, receiver, it will
Signal is amplified, filters, frequency conversion and sampling, finally sends obtained digital signal to signal processor demodulation.High-precision
It spends in navigation field, there are mainly two types of schemes for existing receiver radio frequency scheme：(1) superheterodyne receiver；(2) directly lower to become
Frequency receiver.For superheterodyne receiver, down coversion scheme is using multiple filters and two mixer stages alleviation mirror image twice
Interference, and selection of the realization to frequency band in each mixing, are filtered and amplify, but this circuit increases hardware cost,
In addition, to realize that the receipts star positioning of multifrequency point needs the increase hardware spending of cost.For direct down-conversion receiver, applying
During generally require to introduce phaselocked loop and external frequency mixer, greatly increase hardware spending.
In conclusion there is an urgent need for a kind of receiver radio frequency schemes, on the basis of not increasing hardware costs, to different
The different working frequency points of satellite-signal are handled.
Invention content
A kind of frequency changer circuit of offer of the embodiment of the present invention and receiver board, solve in the prior art to realize
A kind of frequency changer circuit provided in an embodiment of the present invention, including：First local oscillation circuit and N number of radio-frequency channel, wherein N
More than 1；
First local oscillation circuit and the first frequency mixer in each radio-frequency channel, the second frequency mixer, third frequency mixer phase
Even, and by the first local oscillation signal of generation input first frequency mixer, the second local oscillation signal input second frequency mixer and
Third local oscillation signal inputs the third frequency mixer, and second local oscillation signal differs 90 ° with the third local oscillation signal phase；
The radio frequency corresponding with the radio-frequency channel that each radio-frequency channel in N number of radio-frequency channel is used to receive
Signal is converted to the roads I and Q roadbeds band signal and exports；
First frequency mixer, for radiofrequency signal corresponding with the radio-frequency channel and the first will to be received
The signal that shakes is mixed, and is obtained corresponding first intermediate-freuqncy signal in the radio-frequency channel and is exported to second frequency mixer and the third
Frequency mixer；
Second frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received and described second
Local oscillation signal is mixed, and is obtained corresponding the second low intermediate frequency signal of the roads I in the radio-frequency channel and is exported；
The third frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received and the third
Local oscillation signal is mixed, and is obtained corresponding the second low intermediate frequency signal of the roads Q in the radio-frequency channel and is exported.
Preferably, the frequency of second local oscillation signal is 1/8th of the frequency of first local oscillation signal；It is described
The phase of second local oscillation signal is 0 °；
The frequency of the third local oscillation signal is 1/8th of the frequency of first local oscillation signal；The third local oscillator
The phase of signal is 90 °.
Preferably, the frequency of second low intermediate frequency signal of the roads I and second low intermediate frequency signal on the roads Q is less than or equal to
10M。
Preferably, further including：The power splitter that is connect with antenna, the N number of first filter being connect with the power splitter and institute
State N number of radio-frequency channel of N number of first filter connection；
The filter parameter of N number of first filter is different, the satellite navigation radio frequency for receiving the antenna
First frequency mixer of the output to corresponding radio-frequency channel after signal filtering.
Preferably, each radio-frequency channel in N number of radio-frequency channel further includes：
The second filter being connect with second frequency mixer, the I for second frequency mixer output to receiving
The second low intermediate frequency signal of road is filtered；
The first automatic gain controller being connect with the second filter, for second filtering to receiving
Filtered the second low intermediate frequency signal of the roads I of device output carries out gain control and regulation；
The first analog-digital converter being connect with first automatic gain controller, for by receive described first from
The second low intermediate frequency signal of the roads I after the adjusting of dynamic gain controller output is converted to digital signal；
The third filter being connect with the third frequency mixer, the Q for the third frequency mixer output to receiving
The second low intermediate frequency signal of road is filtered；
The second automatic gain controller being connect with the third filter, for being filtered to the third received
Filtered the second low intermediate frequency signal of the roads Q of device output carries out gain control and regulation；
The second analog-digital converter being connect with second automatic gain controller, for by receive described second from
The second low intermediate frequency signal of the roads Q after the adjusting of dynamic gain controller output is converted to digital signal.
Preferably, first analog-digital converter, is specifically used for：
To the second low intermediate frequency signal of the roads I after the adjusting of first automatic gain controller output received with first
Sample frequency is sampled, and the second low intermediate frequency signal of the roads I after sampling is converted to digital signal；
Second analog-digital converter, is specifically used for：
To the second low intermediate frequency signal of the roads Q after the adjusting of second automatic gain controller output received with described
First sample frequency is sampled, and the second low intermediate frequency signal of the roads Q after sampling is converted to digital signal；
Wherein, first sample frequency is a quarter of the frequency of the second local oscillator.
Preferably, the satellite navigation radio-frequency signal that the antenna receives includes the data on frequency point B1, B2, L1 and L2, institute
It is first filter unit and second filter unit to state N number of first filter, and N number of radio-frequency channel is the first radio-frequency channel
With the second radio-frequency channel；
It includes on frequency point B1 and L1 that the first filter unit, which is exported to the radiofrequency signal of first radio-frequency channel,
Data；
It includes on frequency point B2 and L2 that the second filter unit, which is exported to the radiofrequency signal of second radio-frequency channel,
Data.
The second low intermediate frequency signal of the roads I of the output of first analog-digital converter described in first radio-frequency channel includes frequency point B1
Q circuit-switched datas and frequency point L1 I circuit-switched datas；
The second low intermediate frequency signal of the roads Q of the output of second analog-digital converter described in first radio-frequency channel includes frequency point B1
I circuit-switched datas and frequency point L1 Q circuit-switched datas；
The second low intermediate frequency signal of the roads I of the output of first analog-digital converter described in second radio-frequency channel includes frequency point B2
Q circuit-switched datas and frequency point L2 I circuit-switched datas；
The second low intermediate frequency signal of the roads Q of the output of second analog-digital converter described in second radio-frequency channel includes frequency point B2
I circuit-switched datas and frequency point L2 Q circuit-switched datas.
The embodiment of the present invention provides a kind of receiver board, including the frequency changer circuit described in above-described embodiment, further includes：
The baseband processor being connect with the output end of the frequency changer circuit；The baseband processor includes the second local oscillator electricity
Road, with the radio-frequency channel of the frequency changer circuit N number of Base-Band Processing channel correspondingly；
Second local oscillation circuit, for generating the 4th local oscillation signal and the 5th local oscillation signal, the 4th local oscillation signal
Phase differ 90 ° with the phase of the 5th local oscillation signal；
Each Base-Band Processing channel includes the roads I treatment channel, the roads Q treatment channel and processing unit：
The roads I the second Low Medium Frequency letter for each frequency point that the roads I treatment channel exports the correspondence radio-frequency channel received
Number be mixed respectively with the 4th local oscillation signal and the 5th local oscillation signal, obtain each frequency point the roads II second it is low in
The second low intermediate frequency signal of frequency signal and the roads IQ；
The roads Q the second Low Medium Frequency letter for each frequency point that the roads Q treatment channel exports the correspondence radio-frequency channel received
It number is mixed respectively with the 4th local oscillation signal and the 5th local oscillation signal, the roads QI second for obtaining each frequency point are low
The second low intermediate frequency signal of intermediate-freuqncy signal and the roads QQ；
The processing unit, according to second Low Medium Frequency of the roads II of each frequency point of the corresponding radio-frequency channel received
Signal, second low intermediate frequency signal of the roads IQ, second low intermediate frequency signal of the roads QI and second low intermediate frequency signal of the roads QQ, obtain
To the roads the I third signal and the roads Q third signal of the corresponding each frequency point in the radio-frequency channel.
Preferably, the roads I treatment channel specifically includes：4th frequency mixer and the 5th frequency mixer, the 4th frequency mixer
It is exported with the second low intermediate frequency signal of the roads I of each frequency point of corresponding radio-frequency channel with an input terminal of the 5th frequency mixer
What end was connected, another input terminal of the 4th frequency mixer is connected with second local oscillation circuit and receives the 4th local oscillator letter
Number, another input terminal of the 5th frequency mixer is connected with second local oscillation circuit and receives the 5th local oscillation signal；Institute
It states the 4th frequency mixer and the 5th mixer output is connected with the first adder-subtractor of the processing unit；
The roads Q treatment channel specifically includes：6th frequency mixer and the 7th frequency mixer, the 6th frequency mixer and described
One input terminal of seven frequency mixers is connected with the roads Q the second low intermediate frequency signal output end of each frequency point of corresponding radio-frequency channel,
Another input terminal of 6th frequency mixer is connected with second local oscillation circuit and receives the 4th local oscillation signal, and described
Another input terminal of seven frequency mixers is connected with second local oscillation circuit and receives the 5th local oscillation signal, the 6th mixing
Device and the 7th mixer output are connected with the second adder-subtractor of the processing unit.
Preferably, the first adder-subtractor of the processing unit is used for the second low intermediate frequency signal of the roads the II and institute
The second low intermediate frequency signal of the roads QQ is stated to subtract each other to obtain the roads the I third signal of each frequency point；
Second adder-subtractor of the processing unit is used for second low intermediate frequency signal of the roads IQ and the roads QI second
Low intermediate frequency signal is added to obtain the roads the Q third signal of each frequency point.
Preferably, the satellite navigation radio-frequency signal that the antenna receives includes the data on frequency point B1, B2, L1 and L2, institute
It is the first Base-Band Processing channel and the second Base-Band Processing channel to state N number of Base-Band Processing channel；
What first Base-Band Processing channel was used to handle first radio-frequency channel output received includes the roads I second
The second low intermediate frequency signal of low intermediate frequency signal and the roads Q；
The roads I second that second Base-Band Processing channel is used to handle second radio-frequency channel output received are low
The second low intermediate frequency signal of intermediate-freuqncy signal and the roads Q；
The second low intermediate frequency signal of the roads I and L1 frequencies of the roads the I treatment channel processing B1 frequency points in first Base-Band Processing channel
The second low intermediate frequency signal of the roads I of point, the Q that the second low intermediate frequency signals of the roads I of the B1 frequency points is exported by first radio-frequency channel
The second low intermediate frequency signal of road determines；
The second low intermediate frequency signal of the roads Q and L1 frequencies of the roads the Q treatment channel processing B1 frequency points in first Base-Band Processing channel
The second low intermediate frequency signal of the roads Q of point, the I that the second low intermediate frequency signals of the roads Q of the B1 frequency points is exported by first radio-frequency channel
The second low intermediate frequency signal of road determines；
The second low intermediate frequency signal of the roads I and L2 frequencies of the roads the I treatment channel processing B2 frequency points in second Base-Band Processing channel
The second low intermediate frequency signal of the roads I of point, the Q that the second low intermediate frequency signals of the roads I of the B2 frequency points is exported by second radio-frequency channel
The second low intermediate frequency signal of road determines；
The second low intermediate frequency signal of the roads Q and L2 frequencies of the roads the Q treatment channel processing B2 frequency points in second Base-Band Processing channel
The second low intermediate frequency signal of the roads Q of point, the L that the second low intermediate frequency signals of the roads Q of the B2 frequency points is exported by second radio-frequency channel
The second low intermediate frequency signal of road determines.
Preferably, the 4th local oscillation signal is equal with the frequency of the 5th local oscillation signal, the 4th local oscillation signal
Phase be 0 °；90 ° of the phase of 5th local oscillation signal.
The embodiment of the present invention provides a kind of frequency changer circuit, including：First local oscillation circuit and N (N is more than 1) a radio-frequency channel；
First local oscillation circuit is connected with the first frequency mixer, the second frequency mixer, the third frequency mixer in each radio-frequency channel, and will production
The first raw local oscillation signal inputs first frequency mixer, and the second local oscillation signal inputs second frequency mixer and third local oscillator letter
Number input third frequency mixer, second local oscillation signal differ 90 ° with the third local oscillation signal phase；It is described N number of to penetrate
The radiofrequency signal corresponding with the radio-frequency channel that each radio-frequency channel in frequency channel is used to receive is converted to the roads I and Q
Roadbed band signal simultaneously exports；First frequency mixer, for will receive radiofrequency signal corresponding with the radio-frequency channel with
The first local oscillation signal mixing, obtains corresponding first intermediate-freuqncy signal in the radio-frequency channel and exports to second frequency mixer
With the third frequency mixer；Second frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received
It is mixed, obtains corresponding the second low intermediate frequency signal of the roads I in the radio-frequency channel and exports with second local oscillation signal；The third
Frequency mixer is obtained for corresponding first intermediate-freuqncy signal in the radio-frequency channel received to be mixed with the third local oscillation signal
To corresponding the second low intermediate frequency signal of the roads Q in the radio-frequency channel and export.The embodiment of the present invention is realized in a frequency changer circuit
On multiple frequency points are handled, and share a local oscillation circuit, realize multifrequency point radiofrequency signal processing on significantly
Hardware resource is saved.
Description of the drawings
Fig. 1 is a kind of frequency changer circuit schematic diagram provided in an embodiment of the present invention；
Fig. 2 is the frequency changer circuit schematic diagram when N is equal to 2 in the embodiment of the present invention；
Fig. 3 a- Fig. 3 b are the roads the I output principle schematic diagram of LI frequency points down coversion twice in the embodiment of the present invention；
Fig. 4 a- Fig. 4 b are the roads the I output principle schematic diagram of BI frequency points down coversion twice in the embodiment of the present invention；
Fig. 5 is a kind of receiver board schematic diagram provided in an embodiment of the present invention；
Fig. 6 is orthogonal frequency-conversion processing situation schematic diagram in the embodiment of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
Fig. 1 shows a kind of frequency changer circuit schematic diagram provided in an embodiment of the present invention, including：First local oscillation circuit, 101 He
Radio-frequency channel 1021, radio-frequency channel 1022 ..., radio-frequency channel 102N, wherein N be more than 1；
First local oscillation circuit 101 and the first frequency mixer, the second frequency mixer, the third frequency mixer in each radio-frequency channel
It is connected, and the first local oscillation signal of generation is inputted into first frequency mixer, the second local oscillation signal inputs second frequency mixer
The third frequency mixer is inputted with third local oscillation signal, second local oscillation signal is differed with the third local oscillation signal phase
90°；
What each radio-frequency channel in N number of radio-frequency channel was used to receive corresponding with the radio-frequency channel penetrates
Frequency signal is converted to the roads I and Q roadbeds band signal and exports；
First frequency mixer, for radiofrequency signal corresponding with the radio-frequency channel and the first will to be received
The signal that shakes is mixed, and is obtained corresponding first intermediate-freuqncy signal in the radio-frequency channel and is exported to second frequency mixer and the third
Frequency mixer；
Second frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received and described second
Local oscillation signal is mixed, and is obtained corresponding the second low intermediate frequency signal of the roads I in the radio-frequency channel and is exported；
The third frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received and the third
Local oscillation signal is mixed, and is obtained corresponding the second low intermediate frequency signal of the roads Q in the radio-frequency channel and is exported.
It is handled while in above-described embodiment by realizing multifrequency point radiofrequency signal on a frequency changer circuit, and altogether
With a local oscillation circuit, hardware cost is greatly saved, and reduces the size of navigation neceiver board.In addition, each radio frequency
Channel may only handle a frequency point originally, but can also realize a channel by choosing suitable signal frequency point and frequency planning
The radiofrequency signal for handling two frequency bins, further reduces the size of hardware cost and receiver board.
The satellite navigation signals that antenna receives in the embodiment of the present invention can be the signal of a variety of satellite navigation systems, preferably
, satellite navigation signals are one or several in the following contents：Global positioning system (Global Positioning
System, referred to as：GPS), Global Satellite Navigation System (Global Navigation Satellite System, abbreviation：
GNSS), Beidou satellite navigation system (BeiDou Navigation Satellite System, abbreviation：BDS), global satellite
Navigation system (GLONASS), Galileo satellite navigation (GALILEO).The work for the signal that different satellite navigation systems is transmitted
Make frequency point difference, i.e., the satellite navigation system transmits signal on different frequency points.As the frequency point of GPS L1 is
The frequency point of 1561.098MHz, GPS L2 are 1227.6MHz, and the frequency point of BDS B1 is 1575.42MHz, and the frequency point of BDS B2 is
1207.14MHz.It is introduced by taking four frequency points as an example in the embodiment of the present invention, skilled person will appreciate that, the present invention is real
Apply other frequency points that example is applicable to other satellite navigation systems.
In the embodiment of the present invention, preferably, the frequency changer circuit further includes：The power splitter being connect with antenna and the work(
The N number of first filter for dividing device connection, the N number of radio-frequency channel being connect with N number of first filter.
The filter parameter of above-mentioned N number of first filter is different, the satellite navigation radio frequency for receiving the antenna
First frequency mixer of the output to corresponding radio-frequency channel after signal filtering；It can to handle on each radio-frequency channel by filter
Signal frequency point is different.
Wherein, each radio-frequency channel in N number of radio-frequency channel further includes：
The second filter being connect with second frequency mixer, the I for second frequency mixer output to receiving
The second low intermediate frequency signal of road is filtered；
The first automatic gain controller being connect with the second filter, for second filtering to receiving
Filtered the second low intermediate frequency signal of the roads I of device output carries out gain control and regulation；
The first analog-digital converter being connect with first automatic gain controller, for by receive described first from
The second low intermediate frequency signal of the roads I after the adjusting of dynamic gain controller output is converted to digital signal；
The third filter being connect with the third frequency mixer, the Q for the third frequency mixer output to receiving
The second low intermediate frequency signal of road is filtered；
The second automatic gain controller being connect with the third filter, for being filtered to the third received
Filtered the second low intermediate frequency signal of the roads Q of device output carries out gain control and regulation；
The second analog-digital converter being connect with second automatic gain controller, for by receive described second from
The second low intermediate frequency signal of the roads Q after the adjusting of dynamic gain controller output is converted to digital signal.
By foregoing circuit, it can ensure that the digital medium-frequency signal quality of each radio-frequency channel output is good.
Preferably, N is equal to 2, i.e. frequency changer circuit in the embodiment of the present invention includes two radio-frequency channels.Fig. 2 shows this
Frequency changer circuit schematic diagram in inventive embodiments when N is equal to 2.
In the embodiment of the present invention, when N is equal to 2, i.e., when frequency changer circuit has two radio-frequency channels, using down coversion twice,
Two radio-frequency channels share a local oscillation circuit, and correspondingly, have first filter unit and second filter unit.This hair
First filter unit and second filter unit in bright embodiment all can be SAW (surface acoustic wave,
SAW filter).Second filter and third filter can be low-pass filter LPF (Low Pass Filter).This
Another effect of SAW filter in inventive embodiments is to do mirror image inhibition for the first order mixing in frequency changer circuit.
The frequency point that the corresponding frequency point of radiofrequency signal in the embodiment of the present invention is respectively GPS L1 is 1561.098MHz,
The frequency point of GPS L2 is 1227.6MHz, and the frequency point of BDS B1 is 1575.42MHz, and the frequency point of BDS B2 is 1207.14MHz.By
It is close in the frequency point of GPS L1 and BDS B1, therefore the parameter of two first filters can be chosen, such as can choose
Centre frequency is 1570MHz, and pass band width is the first filter unit of 40MHz, at this time first filter unit can by
The frequency point ranges of signal are 1550MHz to 1590MHz, it is seen that first filter unit is only capable of passing through in four frequency points at this time
The corresponding signal of frequency point of GPS L1 and BDS B1.Same reason can since the frequency point of GPS L2 and BDS B2 are close
Selection Center frequency is 1217MHz, and pass band width is the second filter unit of 40MHz, and second filter unit can lead at this time
The frequency point ranges for the signal crossed are 1197MHz to 1237MHz, it is seen that second filter unit is only capable of in four frequency points at this time
Pass through the corresponding signal of frequency point of GPS L2 and BDS B2.
It follows that the processing by above-mentioned two first filter to the radiofrequency signal received, realizes to including
The first time of the radiofrequency signal of multiple frequency points detaches, and can the close signal of frequency point be divided into one group by two first filters.
After the filtering of above-mentioned two first filter, two paths of signals passes through two radio-frequency channels respectively, wherein B1/L1
Signal is handled in the first radio-frequency channel, and B2/L2 signals are handled in the second radio-frequency channel.
Specifically processing procedure of the B1/L1 signals in the first radio-frequency channel is introduced below by step 1 to step 5.
Step 1：First frequency mixer mixes the B1/L1 signals received with the first local oscillation signal caused by local oscillation circuit
Frequently, it obtains corresponding first intermediate-freuqncy signal and exports to the second frequency mixer and third frequency mixer.
Step 2：Second frequency mixer is by the second local oscillation signal caused by the first intermediate-freuqncy signal received and local oscillation circuit
Mixing, obtains 1 corresponding the second low intermediate frequency signal of the roads I of radio-frequency channel and exports；The radio-frequency channel 1 that third frequency mixer will receive
Corresponding first intermediate-freuqncy signal is mixed with third local oscillation signal caused by local oscillation circuit, obtains the 1 corresponding roads Q of radio-frequency channel
Two low intermediate frequency signals simultaneously export.
The embodiment of the present invention carries out double conversion, specific frequency planning situation such as 1 institute of table by step 1 and step 2
Show：
Table 1
The embodiment of the present invention carries out double conversion by step 1 and step 2 to radiofrequency signal, and to different conversion process
Employed in the sample frequency of local oscillation signal carried out corresponding design.
The specific design result of the sample frequency of local oscillation signal is in the embodiment of the present invention：The frequency of second local oscillation signal is
/ 8th of the frequency of first local oscillation signal, the frequency of third local oscillation signal are the frequency of first local oscillation signal
1/8th.The second low intermediate frequency signal of the roads I and the second low intermediate frequency signal of the roads Q pass through the second Low Medium Frequency of the roads I that double conversion obtains
Signal and the roads Q the second low intermediate frequency signal frequency can be that the reduction of subsequent sampling frequency provides safeguard, reduce in 10Mhz or so
Hardware cost, it is also possible to overcome the problems, such as that Direct-conversion is caused by zero intermediate frequency in the prior art.
Specifically design principle is：From the point of view of comprehensive four frequency points, L1 and L2 includes P codes, bandwidth in B1, L1, B2, L2 frequency point
Most high frequency for 20.46M, the simulation Low Medium Frequency of four frequency points is 9.6M+10.23M=19.83M, fixed according to nyquist sampling
Reason, the sample rate of ADC are at least 39.66M, consider interference of the harmonic wave of sample frequency to radio frequency leading portion, choose the frequency dividing of local oscillator
Signal sample rate the most, the second local oscillation signal are 174M, weigh Least sampling rate 39.66M, 174 ÷ 4=are chosen in design
For 43.5M as sample rate, the frequency multiplication of such sample frequency and local oscillator are mixed down zero, will not introduce difference frequency interference.Compared to state
The sample rate of outer receiver OEM628, analog-to-digital conversion drop to 43.5M by 100M, in the embodiment of the present invention this design reduces
The dominant frequency of Digital Signal Processing alleviates pressure for rear class digital signal processor, also saves hardware resource.
In addition to the sample frequency to the second local oscillation signal and third local oscillation signal is designed, also set in the embodiment of the present invention
Fixed second local oscillation signal differs 90 ° with third local oscillation signal phase, such as the phase of the second local oscillation signal is 0 °, third local oscillator letter
Number phase be 90 °.
By mutually orthogonal the second local oscillation signal and third local oscillation signal, the roads I of B1 (or B2) signal are exported into superposition
The roads Q are obtained in L1 (or L2) signal, the roads the Q output of B1 (or B2) signal, which is superimposed upon L1 (or L2) signal, obtains the roads I, by said frequencies
Planning is it can be seen that the practical I for containing two frequency bins of I, Q two paths of signals, the Q signal that the first radio-frequency channel exports.For example, the roads I
Output is IOUT, the output of the roads Q is QOUT.Radio frequency part mixing multiplies cos ωLOT (wherein 169.098M ωLO=174M183.42M),
Then the roads I of the secondary down coversion of L1 frequency points are exported as shown in Fig. 3 a- Fig. 3 b.
It can similarly obtain for B1 frequency points, the frequency spectrum of the roads the I output of secondary down coversion is as shown in Figs. 4 a-b.
Step 3：I road of the second filter being connect with the second frequency mixer to second frequency mixer output received
Second low intermediate frequency signal is filtered；The third filter being connect with the third frequency mixer is defeated to the third frequency mixer received
The second low intermediate frequency signal of the roads Q gone out is filtered.
Step 4：The first automatic gain controller being connect with second filter is to the second filter that receives
Filtered the second low intermediate frequency signal of the roads I of output carries out gain control and regulation；Second connect with the third filter
Automatic gain controller carries out gain to filtered the second low intermediate frequency signal of the roads Q of the third filter output received
It controls to adjust.
Step 5：The first automatic gain that the first analog-digital converter being connect with the first automatic gain controller will receive
The second low intermediate frequency signal of the roads I after the adjusting of controller output is converted to digital signal and exports；With second automatic gain
Second analog-digital converter of controller connection, after the adjusting for exporting second automatic gain controller received
The second low intermediate frequency signal of the roads Q is converted to digital signal.
Specifically, the first analog-digital converter is to the I after the adjusting of first automatic gain controller output received
The second low intermediate frequency signal of road is sampled with the first sample frequency, and the second low intermediate frequency signal of the roads I after sampling is converted to number
Word signal；Second analog-digital converter is low to the roads Q second after the adjusting of second automatic gain controller output received
Intermediate-freuqncy signal is sampled with first sample frequency, and the second low intermediate frequency signal of the roads Q after sampling is converted to digital letter
Number；Wherein, first sample frequency is a quarter of the frequency of the second local oscillator.
The second low intermediate frequency signal of the roads I of the output of first analog-digital converter described in first radio-frequency channel includes frequency point B1
Q circuit-switched datas and frequency point L1 I circuit-switched datas；
The second low intermediate frequency signal of the roads Q of the output of second analog-digital converter described in first radio-frequency channel includes frequency point B1
I circuit-switched datas and frequency point L1 Q circuit-switched datas.
Processing procedure of the B2/L2 signals in the second radio-frequency channel, with place of the B1/L1 signals in the first radio-frequency channel
Reason process is identical, and details are not described herein again.
Above-described embodiment realizes the processing of the radiofrequency signal of four frequency points on two radio-frequency channels, and frequency point frequency is close
Radiofrequency signal handled by a radio-frequency channel, further reduced hardware cost and reduce navigation neceiver board
Size.
Fig. 5 is a kind of receiver board provided in an embodiment of the present invention, including the frequency changer circuit described in above-described embodiment,
Further include：
The baseband processor being connect with the output end of the frequency changer circuit；The baseband processor includes the second local oscillator electricity
Road, with the radio-frequency channel of the frequency changer circuit N number of Base-Band Processing channel correspondingly；
Second local oscillation circuit, for generating the 4th local oscillation signal and the 5th local oscillation signal, the 4th local oscillation signal
Phase differ 90 ° with the phase of the 5th local oscillation signal；
Each Base-Band Processing channel includes the roads I treatment channel, the roads Q treatment channel and processing unit：
The roads I the second Low Medium Frequency letter for each frequency point that the roads I treatment channel exports the correspondence radio-frequency channel received
Number be mixed respectively with the 4th local oscillation signal and the 5th local oscillation signal, obtain each frequency point the roads II second it is low in
The second low intermediate frequency signal of frequency signal and the roads IQ；In the embodiment of the present invention, the frequency phase of the 4th local oscillation signal and the 5th local oscillation signal
Phase Deng, the 4th local oscillation signal is 0 °, and the phase of the 5th local oscillation signal is 90 °.
The roads Q the second Low Medium Frequency letter for each frequency point that the roads Q treatment channel exports the correspondence radio-frequency channel received
Number be mixed respectively with the 4th local oscillation signal and the 5th local oscillation signal, obtain each frequency point the roads QI second it is low in
The second low intermediate frequency signal of frequency signal and the roads QQ.
The processing unit, according to second Low Medium Frequency of the roads II of each frequency point of the corresponding radio-frequency channel received
Signal, second low intermediate frequency signal of the roads IQ, second low intermediate frequency signal of the roads QI and second low intermediate frequency signal of the roads QQ, obtain
To the roads the I third signal and the roads Q third signal of the corresponding each frequency point in the radio-frequency channel.
In above-described embodiment, each frequency point in the second low intermediate frequency signal of radio-frequency channel output is passed through into baseband processor
Processing, can effectively inhibit image frequency, it is ensured that receive the accuracy of signal.By the roads I the second Low Medium Frequency letter of each frequency point
Number with the second low intermediate frequency signal of the roads Q of each frequency point by carrying out merging treatment after the 4th and the 5th local oscillation signal mixed quadrature,
To eliminate partial image interference.
As shown in fig. 6, for orthogonal frequency-conversion processing situation schematic diagram in the embodiment of the present invention.(such as by the second local oscillation signal
Second frequency mixer) and third local oscillation signal (such as third frequency mixer) orthogonal frequency conversion for the first time has been carried out to radiofrequency signal, by low
Output is to baseband processor after the processing such as bandpass filter, and the 4th mutually orthogonal local oscillation signal in baseband processor is (such as
4th frequency mixer) and the 5th local oscillation signal (such as the 5th frequency mixer) second orthogonal frequency conversion is carried out to radiofrequency signal, pass through
Orthogonal frequency conversion can effectively inhibit Image interference twice.
Wherein, the roads I treatment channel specifically includes：4th frequency mixer and the 5th frequency mixer, the 4th frequency mixer and described
One input terminal of the 5th frequency mixer is connected with the roads I the second low intermediate frequency signal output end of each frequency point of corresponding radio-frequency channel
, another input terminal of the 4th frequency mixer is connected with second local oscillation circuit and receives the 4th local oscillation signal, institute
Another input terminal for stating the 5th frequency mixer is connected with second local oscillation circuit and receives the 5th local oscillation signal；Described 4th
Frequency mixer and the 5th mixer output are connected with the first adder-subtractor of the processing unit；The roads Q treatment channel is specific
Including：One input terminal of the 6th frequency mixer and the 7th frequency mixer, the 6th frequency mixer and the 7th frequency mixer with it is corresponding
Radio-frequency channel each frequency point the roads Q the second low intermediate frequency signal output end be connected, another input terminal of the 6th frequency mixer
Be connected with second local oscillation circuit and receive the 4th local oscillation signal, another input terminal of the 7th frequency mixer with it is described
Second local oscillation circuit is connected and receives the 5th local oscillation signal, the 6th frequency mixer and the 7th mixer output with
Second adder-subtractor of the processing unit is connected.
In the embodiment of the present invention, the first adder-subtractor of processing unit is used for the second low intermediate frequency signal of the roads the II
Subtract each other to obtain the roads the I third signal of each frequency point with second low intermediate frequency signal of the roads QQ；
Second adder-subtractor is for second low intermediate frequency signal of the roads IQ to be added with second low intermediate frequency signal of the roads QI
Obtain the roads the Q third signal of each frequency point.
In the embodiment of the present invention, it will be assumed that the satellite navigation radio-frequency signal that antenna receives includes on frequency point B1, B2, L1 and L2
Data, N number of Base-Band Processing channel be the first Base-Band Processing channel and the second Base-Band Processing channel, respectively with frequency changer circuit
In the first radio-frequency channel and the second radio-frequency channel it is corresponding.
Wherein, the first Base-Band Processing channel be used to handle first radio-frequency channel output received including the roads I the
The second low intermediate frequency signal of two low intermediate frequency signals and the roads Q；Second Base-Band Processing channel is for handling second radio frequency received
The second low intermediate frequency signal of the second low intermediate frequency signal of the roads I and the roads Q of channel output.
The second low intermediate frequency signal of the roads I and L2 frequencies of the roads the I treatment channel processing B2 frequency points in first Base-Band Processing channel
The second low intermediate frequency signal of the roads I of point, the Q that the second low intermediate frequency signals of the roads I of the B2 frequency points is exported by first radio-frequency channel
The second low intermediate frequency signal of road determines；During the roads Q second of the roads the Q treatment channels processing B2 frequency points in first Base-Band Processing channel are low
The second low intermediate frequency signal of the roads Q of frequency signal and L2 frequency points, the second low intermediate frequency signal of the roads Q of the B2 frequency points is by first radio frequency
The second low intermediate frequency signal of the roads I of channel output determines.
The second low intermediate frequency signal of the roads I and L1 frequencies of the roads the I treatment channel processing B1 frequency points in second Base-Band Processing channel
The second low intermediate frequency signal of the roads I of point, the Q that the second low intermediate frequency signals of the roads I of the B1 frequency points is exported by second radio-frequency channel
The second low intermediate frequency signal of road determines；During the roads Q second of the roads the Q treatment channels processing B1 frequency points in second Base-Band Processing channel are low
The second low intermediate frequency signal of the roads Q of frequency signal and L1 frequency points, the second low intermediate frequency signal of the roads Q of the B1 frequency points is by second radio frequency
The second low intermediate frequency signal of the roads L of channel output determines.
In the above-described embodiments, since each radio-frequency channel outputs the second low intermediate frequency signal of the roads I and the roads Q of two frequency bins
Second low intermediate frequency signal, therefore need first to determine the second low intermediate frequency signal of the second low intermediate frequency signal of the roads each frequency point I and the roads Q, have
The following example of determination process of body.Then passed through according to the second low intermediate frequency signal of the roads each frequency point I and the second low intermediate frequency signal of the roads Q
The processing of baseband processor realizes the roads the I third signal and the roads Q third signal of each frequency point final output.In Base-Band Processing
Digital quadrature frequency conversion is carried out by the I/Q signal of two mutually orthogonal four frequency points of digital local oscillator signal pair in device, to realize
The mirror image of each frequency point is inhibited.
The roads the I signal of frequency changer circuit output in above-described embodiment is IOUT, the roads Q signal is QOUT。
It can be obtained by the Hilbert transform and analytic signal relevant knowledge of cosine function, if being multiplied by a change to above-mentioned signal
Change factor ejπ/2=j, then it represents that the frequency spectrum of the signal is rotated by 90 ° counterclockwise.Then the roads Q indicate that the roads Q of the signal become real part, I
Road becomes imaginary part.If it is I that note B1 signals, which obtain the roads I,B1, then IB1=QOUT×j.It can similarly obtain, then have Q for the roads Q of B1B1=IOUT
×j.Then, the data I of the roads I outputOUTItself it is the roads the I signal of L1 frequency points, IOUT× j is then the roads the Q signal of B1 frequency points.
Similarly, the data Q of the roads Q outputOUTItself it is the roads the Q signal of L1 frequency points, QOUT× j is then the roads the I signal of B1 frequency points.According to just
The principle of down coversion is handed over, orthogonal transformation is carried out to the IQ two paths of signals of the IQ two paths of signals of L1 frequency points and B1 frequency points respectively.
The mutually orthogonal digital local oscillator signal of numerical portion is respectively that cos ω t and sin ω t, α, β parameters are for compensating
I, the parameter of Q amplitude-phases takes α=1, β=0 for convenience of derivation formula.
Have for L1 frequency points：IIL1=IOUT×cosωt；IQL1=IOUT×sinωt；QIL1=QOUT×cosωt；QQL1
=QOUT×sinωt.For L1 frequency points, the IQ two-way after Digital Down Convert is respectively：
IdL1=IIL1-QQL1=IOUT×cosωt-QOUT×sinωt；
QdL1=QIL1+IQL1=QOUT×cosωt+IOUT×sinωt；
Have for B1 frequency points：IIB1=QOUT×j×cosωt；IQB1=QOUT×j×sinωt；QIB1=IOUT×j×
cosωt；QQB1=IOUT×j×sinωt。
IdB1=IIB1-QQB1=j × (QOUT×cosωt-IOUT×sinωt)；
QdB1=QIB1+IQB1=j × (IOUT×cosωt+QOUT×sinωt)；
IdB1、QdB1For pure imaginary number, the frequency spectrum of B1 signals is rotated by 90 ° by expression, therefore, can be incited somebody to action in digital signal processing
The imaginary part of IQ two paths of signals after the orthogonal frequency conversion of B1 frequency points directly carries out the capture operation of signal as real number.
Similarly, same down-converted is carried out in the second Base-Band Processing channel, in this way on a receiver board
It is achieved that reception, amplification, down coversion and the sampling of four frequency points, greatly saves hardware resource.
It can be seen from the above：The embodiment of the present invention provides a kind of frequency changer circuit, including：First local oscillation circuit and N
(N is more than 1) a radio-frequency channel；The first frequency mixer, the second frequency mixer in first local oscillation circuit and each radio-frequency channel, the
Three-mixer is connected, and the first local oscillation signal of generation is inputted first frequency mixer, the second local oscillation signal input described the
Two frequency mixers and third local oscillation signal input the third frequency mixer, second local oscillation signal and the third local oscillation signal phase
90 ° of position difference；Each radio-frequency channel in N number of radio-frequency channel is corresponding with the radio-frequency channel for that will receive
Radiofrequency signal is converted to the roads I and Q roadbeds band signal and exports；First frequency mixer, for that will receive and the radio frequency
The corresponding radiofrequency signal in channel is mixed with first local oscillation signal, obtains corresponding first intermediate-freuqncy signal in the radio-frequency channel simultaneously
It exports to second frequency mixer and the third frequency mixer；Second frequency mixer, for leading to the radio frequency received
Corresponding first intermediate-freuqncy signal in road is mixed with second local oscillation signal, obtain the corresponding roads I second in the radio-frequency channel it is low in
Frequency signal simultaneously exports；The third frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received and institute
The mixing of third local oscillation signal is stated, corresponding the second low intermediate frequency signal of the roads Q in the radio-frequency channel is obtained and exports.The embodiment of the present invention
It realizes and multiple frequency points is handled on a frequency changer circuit, and share a local oscillation circuit, realizing multifrequency point
Hardware resource is greatly saved in the processing of radiofrequency signal.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of frequency changer circuit, which is characterized in that including：First local oscillation circuit and N number of radio-frequency channel, wherein N is more than 1；It is described
The radiofrequency signal of each radio-frequency channel processing two frequency bins in N number of radio-frequency channel；
First local oscillation circuit is connected with the first frequency mixer, the second frequency mixer, the third frequency mixer in each radio-frequency channel, and
First local oscillation signal of generation is inputted into first frequency mixer, the second local oscillation signal inputs second frequency mixer and third sheet
The signal that shakes inputs the third frequency mixer, and second local oscillation signal differs 90 ° with the third local oscillation signal phase；
The radiofrequency signal corresponding with the radio-frequency channel that each radio-frequency channel in N number of radio-frequency channel is used to receive
It is converted to the roads I and Q roadbeds band signal and exports；
First frequency mixer is believed for that will receive radiofrequency signal corresponding with the radio-frequency channel with first local oscillator
Number mixing, obtains corresponding first intermediate-freuqncy signal in the radio-frequency channel and exports to be mixed to second frequency mixer and the third
Device；
Second frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received and second local oscillator
Signal is mixed, and is obtained corresponding the second low intermediate frequency signal of the roads I in the radio-frequency channel and is exported；
The third frequency mixer, for by corresponding first intermediate-freuqncy signal in the radio-frequency channel received and the third local oscillator
Signal is mixed, and is obtained corresponding the second low intermediate frequency signal of the roads Q in the radio-frequency channel and is exported；
Wherein, the frequency changer circuit further includes：The power splitter being connect with antenna, N number of first filtering being connect with the power splitter
Device, the N number of radio-frequency channel being connect with N number of first filter；
The filter parameter of N number of first filter is different, the satellite navigation radio-frequency signal for receiving the antenna
First frequency mixer of the output to corresponding radio-frequency channel after filtering.
2. frequency changer circuit as described in claim 1, which is characterized in that the frequency of second local oscillation signal is the first
Shake signal frequency 1/8th；The phase of second local oscillation signal is 0 °；
The frequency of the third local oscillation signal is 1/8th of the frequency of first local oscillation signal；The third local oscillation signal
Phase be 90 °.
3. frequency changer circuit as described in claim 1, which is characterized in that the of second low intermediate frequency signal of the roads I and the roads Q
The frequency of two low intermediate frequency signals is less than or equal to 10M.
4. frequency changer circuit as described in any one of claims 1 to 3, which is characterized in that each of described N number of radio-frequency channel is penetrated
Frequency channel further includes：
The second filter being connect with second frequency mixer, the roads I for second frequency mixer output to receiving
Two low intermediate frequency signals are filtered；
The first automatic gain controller being connect with the second filter, for defeated to the second filter received
Filtered the second low intermediate frequency signal of the roads I gone out carries out gain control and regulation；
The first analog-digital converter being connect with first automatic gain controller, for increasing receive described first automatically
The second low intermediate frequency signal of the roads I after the adjusting of beneficial controller output is converted to digital signal；
The third filter being connect with the third frequency mixer, the roads Q for the third frequency mixer output to receiving
Two low intermediate frequency signals are filtered；
The second automatic gain controller being connect with the third filter, for defeated to the third filter received
Filtered the second low intermediate frequency signal of the roads Q gone out carries out gain control and regulation；
The second analog-digital converter being connect with second automatic gain controller, for increasing receive described second automatically
The second low intermediate frequency signal of the roads Q after the adjusting of beneficial controller output is converted to digital signal.
5. frequency changer circuit as claimed in claim 4, which is characterized in that first analog-digital converter is specifically used for：
To the second low intermediate frequency signal of the roads I after the adjusting of first automatic gain controller output received with the first sampling
Frequency is sampled, and the second low intermediate frequency signal of the roads I after sampling is converted to digital signal；
Second analog-digital converter, is specifically used for：
To the second low intermediate frequency signal of the roads Q after the adjusting of second automatic gain controller output received with described first
Sample frequency is sampled, and the second low intermediate frequency signal of the roads Q after sampling is converted to digital signal；
Wherein, first sample frequency is a quarter of the frequency of the second local oscillator.
6. frequency changer circuit as claimed in claim 4, which is characterized in that the satellite navigation radio-frequency signal that the antenna receives includes
Data on frequency point B1, B2, L1 and L2, N number of first filter are first filter unit and second filter unit, institute
It is the first radio-frequency channel and the second radio-frequency channel to state N number of radio-frequency channel；
It includes data on frequency point B1 and L1 that the first filter unit, which is exported to the radiofrequency signal of first radio-frequency channel,；
It includes data on frequency point B2 and L2 that the second filter unit, which is exported to the radiofrequency signal of second radio-frequency channel,；
The second low intermediate frequency signal of the roads I of the output of first analog-digital converter described in first radio-frequency channel includes the Q of frequency point B1
The I circuit-switched datas of circuit-switched data and frequency point L1；
The second low intermediate frequency signal of the roads Q of the output of second analog-digital converter described in first radio-frequency channel includes the I of frequency point B1
The Q circuit-switched datas of circuit-switched data and frequency point L1；
The second low intermediate frequency signal of the roads I of the output of first analog-digital converter described in second radio-frequency channel includes the Q of frequency point B2
The I circuit-switched datas of circuit-switched data and frequency point L2；
The second low intermediate frequency signal of the roads Q of the output of second analog-digital converter described in second radio-frequency channel includes the I of frequency point B2
The Q circuit-switched datas of circuit-switched data and frequency point L2.
7. a kind of receiver board, which is characterized in that including the frequency changer circuit described in claim 1 to 6 any claim, also
Including：
The baseband processor being connect with the output end of the frequency changer circuit；The baseband processor include the second local oscillation circuit, with
The radio-frequency channel of the frequency changer circuit N number of Base-Band Processing channel correspondingly；
Second local oscillation circuit, for generating the 4th local oscillation signal and the 5th local oscillation signal, the phase of the 4th local oscillation signal
Position differs 90 ° with the phase of the 5th local oscillation signal；
Each Base-Band Processing channel includes the roads I treatment channel, the roads Q treatment channel and processing unit：
The second low intermediate frequency signal of the roads I for each frequency point that the roads I treatment channel exports the correspondence radio-frequency channel received point
It is not mixed with the 4th local oscillation signal and the 5th local oscillation signal, obtains the roads II the second Low Medium Frequency letter of each frequency point
Number and the second low intermediate frequency signal of the roads IQ；
The second low intermediate frequency signal of the roads Q for each frequency point that the roads Q treatment channel exports the correspondence radio-frequency channel received point
It is not mixed with the 4th local oscillation signal and the 5th local oscillation signal, obtains the roads QI the second Low Medium Frequency letter of each frequency point
Number and the second low intermediate frequency signal of the roads QQ；
The processing unit is believed according to second Low Medium Frequency of the roads II of each frequency point of the corresponding radio-frequency channel received
Number, second low intermediate frequency signal of the roads IQ, second low intermediate frequency signal of the roads QI and second low intermediate frequency signal of the roads QQ, obtain
The roads the I third signal and the roads Q third signal of the corresponding each frequency point in the radio-frequency channel.
8. receiver board as claimed in claim 7, which is characterized in that
The roads I treatment channel specifically includes：4th frequency mixer and the 5th frequency mixer, the 4th frequency mixer and the described 5th mix
One input terminal of frequency device is connected with the roads I the second low intermediate frequency signal output end of each frequency point of corresponding radio-frequency channel, institute
Another input terminal for stating the 4th frequency mixer is connected with second local oscillation circuit and receives the 4th local oscillation signal, and the described 5th
Another input terminal of frequency mixer is connected with second local oscillation circuit and receives the 5th local oscillation signal；4th frequency mixer
It is connected with the first adder-subtractor of the processing unit with the 5th mixer output；
The roads Q treatment channel specifically includes：6th frequency mixer and the 7th frequency mixer, the 6th frequency mixer and the described 7th mix
One input terminal of frequency device is connected with the roads Q the second low intermediate frequency signal output end of each frequency point of corresponding radio-frequency channel, described
Another input terminal of 6th frequency mixer is connected with second local oscillation circuit and receives the 4th local oscillation signal, and the described 7th is mixed
Another input terminal of frequency device is connected with second local oscillation circuit and receives the 5th local oscillation signal, the 6th frequency mixer and
7th mixer output is connected with the second adder-subtractor of the processing unit.
9. receiver board as claimed in claim 8, which is characterized in that the first adder-subtractor of the processing unit for pair
Second low intermediate frequency signal of the roads II and second low intermediate frequency signal of the roads QQ subtract each other to obtain the roads the I third letter of each frequency point
Number；
Second adder-subtractor of the processing unit be used for by second low intermediate frequency signal of the roads IQ and the roads QI second it is low in
Frequency signal is added to obtain the roads the Q third signal of each frequency point.
10. the receiver board stated such as claim 8, which is characterized in that the satellite navigation radio-frequency signal packet that the antenna receives
The data on frequency point B1, B2, L1 and L2 are included, N number of Base-Band Processing channel is at the first Base-Band Processing channel and the second base band
Manage channel；N number of radio-frequency channel is the first radio-frequency channel and the second radio-frequency channel；
What first Base-Band Processing channel was used to handle first radio-frequency channel output received includes during the roads I second are low
The second low intermediate frequency signal of frequency signal and the roads Q；
Second Base-Band Processing channel is used to handle the roads I the second Low Medium Frequency letter of second radio-frequency channel output received
Number and the second low intermediate frequency signal of the roads Q；
The I of the roads I the second low intermediate frequency signal and L1 frequency points of the roads the I treatment channel processing B1 frequency points in first Base-Band Processing channel
The second low intermediate frequency signal of road, the roads Q second that the second low intermediate frequency signals of the roads I of the B1 frequency points is exported by first radio-frequency channel
Low intermediate frequency signal determines；
The Q of the roads Q the second low intermediate frequency signal and L1 frequency points of the roads the Q treatment channel processing B1 frequency points in first Base-Band Processing channel
The second low intermediate frequency signal of road, the roads I second that the second low intermediate frequency signals of the roads Q of the B1 frequency points is exported by first radio-frequency channel
Low intermediate frequency signal determines；
The I of the roads I the second low intermediate frequency signal and L2 frequency points of the roads the I treatment channel processing B2 frequency points in second Base-Band Processing channel
The second low intermediate frequency signal of road, the roads Q second that the second low intermediate frequency signals of the roads I of the B2 frequency points is exported by second radio-frequency channel
Low intermediate frequency signal determines；
The Q of the roads Q the second low intermediate frequency signal and L2 frequency points of the roads the Q treatment channel processing B2 frequency points in second Base-Band Processing channel
The second low intermediate frequency signal of road, the roads L second that the second low intermediate frequency signals of the roads Q of the B2 frequency points is exported by second radio-frequency channel
Low intermediate frequency signal determines.
11. receiver board as claimed in claim 7, which is characterized in that the 4th local oscillation signal and the 5th local oscillator
The frequency of signal is equal, and the phase of the 4th local oscillation signal is 0 °；90 ° of the phase of 5th local oscillation signal.
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| US9793935B2 (en) * | 2015-07-02 | 2017-10-17 | Mediatek Inc. | Multi-mixer system and method for reducing interference within multi-mixer system |
| CN105204041A (en) * | 2015-09-29 | 2015-12-30 | 上海海积信息科技股份有限公司 | Tracking loop processing method and device |
| CN108649967B (en) * | 2018-04-24 | 2020-04-10 | 北京航天控制仪器研究所 | Broadband multi-service transceiver system based on zero intermediate frequency chip |
| CN110244327A (en) * | 2019-07-04 | 2019-09-17 | 广东工业大学 | A kind of satellite positioning receiver and its radio-frequency front-end |
| 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 |
| CN116707573B (en) * | 2023-05-24 | 2024-01-26 | 苏州莱尔微波技术有限公司 | Variable frequency channel assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1893285A (en) * | 2005-07-06 | 2007-01-10 | 络达科技股份有限公司 | Radio-frequency receiver and radio frequency receiving method |
| CN101686064A (en) * | 2008-09-23 | 2010-03-31 | 国民技术股份有限公司 | Double frequency conversion receiving circuit and method for radio-frequency SIM card |
| CN102638228A (en) * | 2012-03-09 | 2012-08-15 | 北京创毅讯联科技股份有限公司 | Up-converter and up-conversion method |
| CN103713295A (en) * | 2013-12-27 | 2014-04-09 | 北京苍穹数码测绘有限公司 | Single-board three-antenna high-precision positioning and orientation receiver |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004072515A (en) * | 2002-08-07 | 2004-03-04 | Alps Electric Co Ltd | Direct conversion circuit |
| CN204465459U (en) * | 2015-03-06 | 2015-07-08 | 上海海积信息科技股份有限公司 | A kind of frequency changer circuit and receiver board |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1893285A (en) * | 2005-07-06 | 2007-01-10 | 络达科技股份有限公司 | Radio-frequency receiver and radio frequency receiving method |
| CN101686064A (en) * | 2008-09-23 | 2010-03-31 | 国民技术股份有限公司 | Double frequency conversion receiving circuit and method for radio-frequency SIM card |
| CN102638228A (en) * | 2012-03-09 | 2012-08-15 | 北京创毅讯联科技股份有限公司 | Up-converter and up-conversion method |
| CN103713295A (en) * | 2013-12-27 | 2014-04-09 | 北京苍穹数码测绘有限公司 | Single-board three-antenna high-precision positioning and orientation receiver |
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