CN107800444A - A kind of multi-frequency multi-mode GNSS radiofrequency signals recording-reproducing system and method - Google Patents
A kind of multi-frequency multi-mode GNSS radiofrequency signals recording-reproducing system and method Download PDFInfo
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
- H04B1/0085—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band where one band is the image frequency band of the other and the band selection is done by image rejection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of multi-frequency multi-mode GNSS radiofrequency signals recording-reproducing system and method, including the reception antenna for receiving GPS L1 and L2 frequency ranges and the B1 frequency ranges of the Big Dipper, low-noise amplifier, the first RF switch, the second RF switch, the 3rd RF switch, frequency mixer, local oscillator, the first wave filter, the second wave filter, temperature compensation clock, SDR platforms, control and storage computer, I/O expanders, program control adjustable attenuator, transmitting antenna；The control and storage computer are recorded by the first RF switch of I/O expanders control, the second RF switch, the 3rd RF switch and the switching of playback function and the program control adjustable attenuator of control, to adjust the intensity of playback signal.The advantages that the system has that cost is low, clever structure, working stability, and the file of recording occupies little space.
Description
Technical field
The present invention relates to the teaching of GNSS correlated curriculums and GNSS receiver development ＆ production test equipment technology, especially relate to
And a kind of multi-frequency multi-mode GNSS radiofrequency signals recording-reproducing system and method.
Background technology
The application of GNSS (global navigation satellite system GLONASSs) receiver
It is quite varied, all occupy critical role in every field such as civilian, military, mapping, water conservancy, geology, electric power, forests.GNSS connects
In the R＆D process of receipts machine, recording and the reproducing device of GNSS signal are usually used, it is therefore an objective to be repeatedly formed duplicate
GNSS radiofrequency signal scenes, to test GNSS receiver, different receivers or the different of identical receiver are calculated
Method is compared, verified.With the development of China's dipper system, teaching and scientific research institution and production firm connect to multi-frequency multi-mode GNSS
The R＆D intensity of receipts machine increases, and effect of the multi-frequency multi-mode GNSS radiofrequency signal recording/displaying devices during development ＆ production is very heavy
Will.Current GNSS radiofrequency signals are recorded is generally divided into two classes with replay device, and one kind is single-frequency single mode, and its price is relatively low, but
It is the receiver test needs that can not have met more constellation multifrequency points such as the current GPS/ Big Dippeves.Another kind of is multi-frequency multi-mode GNSS
Signal recording and playing device, it records mode or high speed, high bandwidth ADC collection sides using multiple ADC synchronous acquisitions
Formula, the common drawback of both are that the signal acquisition file of generation is huge.It is synchronously bad to cause and the former also has stationary problem
Time warping between multiple signals, signal can not be played back completely；It is complicated and the cost of the latter is high.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of multi-frequency multi-mode GNSS radiofrequency signals recording/playback method and it is
System, has that cost is low, clever structure, working stability, the advantages that file of recording occupies little space.
The technical solution adopted by the present invention is as follows：
A kind of multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems, including：For receiving GPS L1 and L2 frequency ranges and the Big Dipper
The reception antennas of B1 frequency ranges, low-noise amplifier, the first RF switch, the second RF switch, the 3rd RF switch, mixing
Device, local oscillator, the first wave filter, the second wave filter, temperature compensation clock, SDR platforms, control and storage computer, I/O expanders, it is program control
Adjustable attenuator, transmitting antenna；
The reception antenna, low-noise amplifier, the first RF switch, frequency mixer, the second RF switch, the first filtering
Device, the 3rd RF switch, SDR platforms are sequentially connected, and the local oscillator is connected with frequency mixer, and the 3rd RF switch is penetrated with first
Frequency switch connection, second RF switch, the second wave filter, program control adjustable attenuator, transmitting antenna are sequentially connected, the temperature
Complement clock is connected with SDR platforms, and the SDR platforms are connected with controlling and storing computer, and control and the storage computer passes through I/O
Expander control the first RF switch, the second RF switch, the 3rd RF switch recorded and the switching of playback function and
Program control adjustable attenuator is controlled, to adjust the intensity of playback signal.
Wherein, the reception antenna is from can at least receive having for GPS L1 and L2 frequency ranges and the B1 frequency ranges of the Big Dipper
Source antenna, gain 30db, for receiving the signal of these three frequency ranges.
Wherein, the low-noise amplifier selects microwave low-noise amplifier, effective frequency range in 1200Mhz to 1600Mhz,
Gain 25db；Built using multi-mode microwave triode designed, designed or the amplifier mould from model ZX60-P162LN+
Block.
Wherein, first RF switch, the second RF switch, the 3rd RF switch use model ZX80-DR230+
Single-pole double throw RF switch, to the function switch recorded and played back.
Wherein, the frequency mixer uses model ADE-35MH wideband high performance mixer.
Wherein, the local oscillator uses compensation crystal oscillator, frequency of oscillation 170Mhz.
Wherein, first wave filter uses model VBFZ-1400+ wave filter, and second wave filter uses three
Wave filter CBP-1228C+, BFCN-1575+, the BFCN-1560+ combination of individual different frequency range is completed.
Wherein, the SDR platforms select HackrfONE, and the temperature compensation clock uses TCXO of the working frequency for 10Mhz；
The program control adjustable attenuator, from model ZX76-31-PN-S attenuator；
The I/O expanders are made up of single chip computer AT MEGA 128 and UART-USB interface conversion chip FDTI FT232R,
Both, which coordinate, completes to receive control and the instruction of storage computer, to control the first RF switch, the second RF switch, the 3rd radio frequency
Switch and program control adjustable attenuator.
A kind of recording/playback method using multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems described above, including following step
Suddenly：
Step S1, the frequency of selected local oscillator；
Step S2, signal recording：The signal from reception antenna is amplified by low-noise amplifier, while local oscillator
A high-frequency local oscillation signal is produced, the signal after amplification and local oscillation signal are sent into frequency mixer mixing, obtain f1、f2、f3、f4、f5、
f66 signals, by the first wave filter by f1、f3、f5Three larger image signals of frequency range spacing filter out, and retain f2、f4、f6Frequently
It is intersegmental away from less three signals so that the spacing of three frequencies diminishes, and invalid portions of the spectrum is squeezed out, then will filtering after
Signal be amplified again, signal finally is delivered into ADC device is sampled, the numerical data transmission after sampling to control and
Storage computer is stored, in case signal playback；
Step S3, signal playback：The numerical data that samples storage obtains is subjected to conversion by DAC equipment and retrieves mould
Intend signal, analog signal now includes f2、f4、f6Three signals, by high-frequency signal caused by local oscillator and obtained analog signal
It is mixed again, obtains f7、f8、f9、f10、f11、f126 signals, then by the second wave filter by image signal f7、f11、f12Filter out,
Only retain the f of reduction8、f9、f10These three signals needed, signal is finally subjected to intensity adjustment with program control adjustable attenuator,
Comply with requirement.
Wherein, the step
S1 is specially：The frequency of local oscillator is set as flo, and flo<GPS L2 frequency ranges；
The step S2, it is specially：Step a, after frequency mixer is mixed, the signal of L1/L2/B1 signals and local oscillator can produce
Raw following signal：
And frequency：
f1=L1+flo；f2=L2+flo；f3=B1+flo；
Difference frequency：
f4=L1-flo；f5=L2-flo；f6=B1-flo；
Step b, caused 6 mixed frequency signals obtain 3 less signals of frequency range spacing by the first wave filter, i.e., and frequently
f2With two difference frequency f4、f6；
The step S3, it is specially：In the signal playback stage, again by these three frequencies f2、f4、f6Signal and floIt is mixed
Frequently, so as to which by signals revivification, the signal for being now mixed to obtain also has 6：
And frequency：
f7=f2+flo=L2+2flo；
f8=f4+flo=L1-flo+flo；
f9=f6+flo=B1-flo+flo；
Difference frequency：
f10=f2-flo=L2+flo-flo；
f11=f4-flo=L1-flo-flo；
f12=f6-flo=B1-flo-flo；
It can be seen that and frequency f8、f9With difference frequency f10L1, B1, the L2 exactly needed, lead in addition with three unnecessary image signals
The second wave filter is crossed to filter.
Beneficial effect：
A kind of multi-frequency multi-mode GNSS radiofrequency signals recording-reproducing system provided by the invention and method, using can be produced during frequency conversion and
Frequency and the phenomenon of two mixing results (i.e. mirror image) of difference frequency, have used different and frequency signal when signal recording is from playing back
With difference frequency signal, in the signal recording stage, the purpose of mixing is to reduce the spacing between effective frequency, so as to conveniently adopt
Collection；And playback phase, the purpose of mixing are the spacing between the effective frequency of stretching, to reach the purpose of recovering signal.For not
With the signal of frequency, it is respectively adopted and frequency and difference frequency signal, so as to make full use of image signal, effective bandwidth is significantly pressed
Contracting, reduces requirement on devices and system complexity, while reduce cost.The system has that cost is low, clever structure, work
Stably, the advantages that file of recording occupies little space.
Brief description of the drawings
Fig. 1：Flo=160Mhz provided by the invention, the spectrum diagram with a width of 38.82Mhz after compression.
Fig. 2：Flo=170Mhz provided by the invention, the spectrum diagram with a width of 28.82Mhz after compression.
Fig. 3：A kind of structured flowchart of multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems provided by the invention.
In figure：
101- reception antennas；102- low-noise amplifiers；The RF switches of 103- first；The RF switches of 106- second；108
Three RF switches；104- frequency mixers；105- local oscillators；The wave filters of 107- first；109- temperature compensation clocks；110-SDR platforms；111- is controlled
System and storage computer；The wave filters of 112- second；The program control adjustable attenuators of 113-；114- transmitting antennas；115-I/O expanders.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
Technical solution of the present invention is described in detail with reference to the accompanying drawings and examples.
Embodiment 1
Current GNSS signal mainly include the Big Dipper (BDS), GPS, GLONASS, Jia Lilve (Galileo), QZSS and
IRNSS.At present, the application of GPS system is wider, and the prospect of BDS systems is more noticeable.Therefore the present apparatus mainly for
GPS and BDS system designs.
And gps signal includes L1, tri- frequency ranges of L2, L5, BDS Passive Positioning System also includes B1, tri- frequencies of B2, B3
Section.In these frequency ranges, for civilian mainly GPS L1 and L2 and BDS B1.Its centre frequency, signal bandwidth, the people
It is respectively with the common bandwidth of receiver：
Table 1：GPS L1/L2 and BDS B1 frequency meters
It can be seen that the bandwidth of three frequency range coverings alreadys exceed 350Mhz, if the form directly sampled using in general,
Requirement to device is at a relatively high, and corresponding cost is also very high.
After the relation of three frequency ranges is studied, it is known that these three frequency ranges are not continuous, its effective total bandwidth is only
Have a 26Mhz, middle Mhz more than 300 actually and need not, another fact is, because GPS and dipper system are used
CDMA coded systems, overlapped even in frequency spectrum marginal portion, the influence received to signal is also extremely limited.Therefore propose
Such as the method for downward frequency variable method compression bandwidth：
By signal progress frequency-conversion processing it is a kind of conventional means in radiotechnics by frequency mixer, the mesh of usual frequency conversion
Be by Spectrum Conversion a to intermediate frequency (single-conversion) or several intermediate frequencies (multiple frequency conversion), to avoid amplifier from causing self-excitation
Facilitate Design enlargement device and wave filter simultaneously.In common wireless device, otherwise only with difference frequency, or only with and frequency.
And the present invention utilizes the phenomenon that can be produced during frequency conversion with frequency and two mixing results (i.e. mirror image) of difference frequency, in signal recording and playback
When used different and frequency signal and difference frequency signal, in the signal recording stage, the purpose of mixing is to reduce effective frequency
Between spacing, gathered so as to convenient；And playback phase, the purpose of mixing are the spacing between the effective frequency of stretching, with
Reach the purpose of recovering signal.For the signal of different frequent points, it is respectively adopted and frequency and difference frequency signal, so as to make full use of mirror image
Signal, effective bandwidth is significantly compressed, reduce requirement on devices and system complexity, while reduce cost.
As shown in figure 3, the present embodiment includes：For receiving the reception of GPS L1 and L2 frequency ranges and the B1 frequency ranges of the Big Dipper
Antenna 101, low-noise amplifier 102, the first RF switch 103, the second RF switch 106, the 3rd RF switch 108, mixing
Device 104, local oscillator 105, the first wave filter 107, the second wave filter 112, temperature compensation clock 109, SDR platforms 110, control and storage electricity
Brain 111, I/O expanders 115, program control adjustable attenuator 113, transmitting antenna 114；
The reception antenna 101, low-noise amplifier 102, the first RF switch 103, frequency mixer 104, the second radio frequency are opened
Close the 106, first wave filter 107, the 3rd RF switch 108, SDR platforms 110 to be sequentially connected, the local oscillator 105 and frequency mixer 104
Connection, the 3rd RF switch 108 are connected with the first RF switch 103, second RF switch 106, the second wave filter
112nd, program control adjustable attenuator 113, transmitting antenna 114 are sequentially connected, and the temperature compensation clock 109 is connected with SDR platforms 110, institute
State SDR platforms 110 to be connected with controlling and storing computer 111, control and the storage computer 111 is controlled by I/O expanders 115
First RF switch 103, the second RF switch 106, the 3rd RF switch 108 is recorded and the switching and control of playback function
Processing procedure control adjustable attenuator 113, to adjust the intensity of playback signal.
Reception antenna 101 is from the active antenna that can at least receive GPS L1/L2 frequency ranges and Big Dipper B1 frequency ranges, gain
30db or so, for receiving the signal of these three frequency ranges.
Low-noise amplifier 102 selects general microwave low-noise amplifier, effective frequency range in 1200Mhz to 1600Mhz,
Gain 25db or so.It can be built or from ready-made amplifier module using multi-mode microwave triode designed, designed, such as
ZX60-P162LN+。
First RF switch 103, the second RF switch 106, the 3rd RF switch 108 use single-pole double throw RF switch
ZX80-DR230+, to the function switch recorded and played back.
Frequency mixer 104 uses model ADE-35MH wideband high performance mixer.
Local oscillator 105 uses compensation crystal oscillator, frequency of oscillation 170Mhz.
First wave filter 107 is using model VBFZ-1400+ wave filter, and the second wave filter 112 is using three different frequencies
Wave filter CBP-1228C+, BFCN-1575+, the BFCN-1560+ combination of section is completed.
SDR platforms 110 select HackrfONE, and cost is low, increases income completely, are easy to develop.But its select clock performance compared with
Difference, frequency is unstable and phase noise is bigger than normal, can not ensure overall performance, it is therefore necessary to coordinates temperature compensation clock 109, a work
Working frequency is the general TCXO of 10Mhz.If cost is permitted, can also be replaced with the OCXO or atomic frequency standard of higher performance.
Control and storage computer 111 store the signal of recording to control HackRF ONE operation, also need to simultaneously
By I/O expanders 115 control the first RF switch 103, the second RF switch 106, the 3rd RF switch 108 recorded and
The switching of playback function and the program control adjustable attenuator 113 of control, to adjust the intensity of playback signal.
Program control adjustable attenuator 113, to adjust playback signal intensity, from ZX76-31-PN-S.
I/O expanders 115 are made up of single chip computer AT MEGA 128 and UART-USB interface conversion chip FDTI FT232R,
ATMEGA128 rich interfaces, and FT232R stable performances, both, which coordinate, completes to receive control and the instruction of storage computer 111, with
Control the work(of the first RF switch 103, the second RF switch 106, the 3rd RF switch 1088 and program control adjustable attenuator 113
Energy.
Embodiment 2
The selection of the frequency of local oscillator 105 is most important for requirement of the sampling with the quality of playback and to device, equipment.
If the frequency of local oscillator 105 is flo, and flo<L2 is flo<1227.6Mhz, then after mixing, L1/L2/B1 signals with
Local oscillation signal can produce following signal：
And frequency：
f1=L1+flo=1575.42+flo
f2=L2+flo=1227.6+flo
f3=B1+flo=1561.098+flo
Difference frequency：
f4=L1-flo=1575.42-flo
f5=L2-flo=1227.6-flo
f6=B1-flo=1561.098-flo
As long as select suitable flo, it is possible in 6 mixed frequency signals caused by more than, it is enough to obtain 3 frequency spacing
Small signal.In order to shorten the spacing of three frequencies, one and frequency f should be selected2That is 1227.6+floWith two difference frequency f4I.e.
1575.42-flo、f6That is 1561.098-flo.And total bandwidth now is reduced to:
f4-f2+ 1+10=358.82-2flo
In above formula 1 and 10 be respectively L1 and L2 effective bandwidth half.
When playback, again by these three frequencies (f2、f4、f6) signal and floMixing, so as to by signals revivification.
The signal for being now mixed to obtain also has 6：
And frequency：
f7=f2+flo=1227.6+flo+flo=1227.6+2flo
f8=f4+flo=1575.42-flo+flo=1575.42Mhz
f9=f6+flo=1561.098-flo+flo=1561.098Mhz
Difference frequency：
f10=f2-flo=1227.6+flo-flo=1227.6
f11=f4-flo=1575.42-flo-flo=1575.42Mhz-2flo
f12=f6-flo=1561.098-flo-flo=1561.098Mhz-2flo
It can be seen that and frequency f8、f9With difference frequency f10L1, B1, the L2 exactly needed, in addition with three unnecessary image signals.
Ensure signal recording and playback quality, it is necessary to select f while in order to reduce bandwidth requirementloSo that meet following three conditions：
1.f1、f2、f3、f4、f5、f6Between spacing reduce so that bandwidth reduce；
2.f1、f2、f3、f4、f5、f6Between as far as possible avoid spectrum overlapping；
3.f7、f8、f9、f10、f11、f12Between as far as possible avoid spectrum overlapping.
Because (L1+L2)/2 are about 174Mhz, therefore f can be selectedloNear 174Mhz.floCloser 174Mhz, then
First condition more readily satisfies, and second and the 3rd condition be less susceptible to meet.floIt is more remote from 174Mhz, then second and
Three conditions more readily satisfy, but first condition is less susceptible to meet.Therefore permit in recording and playback device and device bandwidth
Perhaps in the case of, floIt should try one's best remote from 174Mhz.Such as when selection recording and a width of 40Mhz of playback apparatus band when
Wait, f can be selectedlo=160Mhz, spectrum diagram such as Fig. 1, Fig. 1 (a) now are original signals, middle dotted portion
The bandwidth of representative is about 350Mhz；Fig. 1 (b) is the signal after mixing, f2=1387.6Mhz, f4=1415.42Mhz, f6
=1401.098Mhz, total bandwidth are reduced to 38.82Mhz, and middle dotted portion is squeezed out, only surplus effective information, it can be seen that this
When meet f1、f2、f3、f4、f5、f6Between without spectrum overlapping (f1、f3、f5It is outer in band)；Fig. 1 (c) is the signal of playback, its
Chain lines are useless image signals, f7、f8、f9、f10、f11、f12Between also without spectrum overlapping, meet three conditions will
Ask.For another example when selected recording and playback apparatus band a width of 20Mhz, f can be selectedlo=170Mhz, now,
f2=1397.6Mhz, f4=1405.42Mhz, f6=1391.098Mhz, total bandwidth are reduced to 18.82Mhz, frequency spectrum signal now
Figure as shown in Fig. 2 because bandwidth has been compressed to the effective bandwidth less than 26Mhz, therefore in Fig. 2 (b) it can be seen that, f2、f6
Between slightly spectrum overlapping；It can be seen that f in Fig. 2 (c)7With f9, f10With f11Between also slightly have spectrum overlapping, now to signal
Loss is had, and also has interference between signal, but demand is still met in general test.
After local frequency is selected, you can carry out the recording and playback of signal.
Multi-frequency multi-mode GNSS radiofrequency signal recording/playback methods of the present invention, its working method are：
As shown in figure 3, during signal recording, control and storage computer 111 are penetrated by the control of I/O expanders 115 first
The 103, second RF switch 106 of frequency switch, the 3rd RF switch 108 so that these three switches are respectively positioned on 1 path, so as to low noise
The output end of acoustic amplifier 102 is connected with the RF inputs of frequency mixer 104, the IF ends of frequency mixer 104 and the first wave filter 107
Input is connected, and the output end of the first wave filter 107 is connected with HACKRF ONE RF ends.
Reception antenna 101 is filtered after GPS L1/L2 and the Big Dipper B1 signal are received, amplified, and is then sent to low
Noise amplifier 102, after low-noise amplifier 102 amplifies signal, frequency mixer 104 is delivered to by the first RF switch 103
This signal is mixed, is mixed by RF ends, frequency mixer 104 with frequency of the LO ends from local oscillator 105 for 170Mhz local oscillation signal
As a result it is：
L1:1405.42Mhz
L2:1397.6Mhz
B1:1391.098Mhz
Also three image signals simultaneously：
1745.42Mhz 1057.6Mhz, 1731.098Mhz.
It can be seen that by mixing, L1, L2, the relativeness of tri- frequencies of B1 are changed, and are L2 originally, B1, L1 are in frequency
Rate is incremented by relation, and after mixing, L2 is located at centre, and L1 and B1 respectively fall in L2 both sides, and center frequency spacing is respectively
7.82Mhz and 6.502Mhz.It is this to be distributed the loss for being more beneficial for three frequencies of equilibrium assignment, reduce the influence between them.
Signal after mixing enters the first wave filter 107 by the second RF switch 106, it is allowed to the signal passed through only with
Centered on 1400Mhz, the signal with a width of 20Mhz, i.e., centered on 1405.42Mhz, 1397.6Mhz and 1391.098Mhz
Three signals.And image signal (with 1745.42Mhz, three signals centered on 1057.6Mhz, 1731.098Mhz) is herein
It is filtered out.
Signal after after filtering passes through the 3rd RF switch 108, HackRF ONE RF ends is sent into, by controlling and storing
Computer 111 controls HackRFONE to carry out samples storage to it, and sampling parameter is arranged to centre frequency 1397.6Mhz, samples bit wide
8 bits, sample rate 20MSPS, sample mode are that IQ is orthogonal.Sampling files deliver to control and storage computer by usb bus
111 are stored.
During signal playback, control and storage computer 111 by I/O expanders 115 control the first RF switch 103,
Second RF switch 106, the 3rd RF switch 108 so that these three RF switches are respectively positioned on 2 paths, so as to HackRFONE's
RF ends are connected with the RF inputs of frequency mixer 104, and the IF output ends of frequency mixer 104 are connected with the input of the second wave filter 112.
Then control and the sampling files obtained during recording are delivered to HackRF ONE and played back by storage computer 111, the ginseng of playback
Number is consistent with the parameter recorded, and centre frequency 1397.6Mhz, the bit of bit wide 8, sample rate 20MSPS.Then in HackRF
In the radiofrequency signal that ONE RF output ends obtain, it is respectively 1405.42Mhz to contain centre frequency, 1397.6Mhz and
1391.098Mhz three signals.The signal delivers to frequency mixer 104 by the 3rd RF switch 108, the first RF switch 103
RF inputs, with from local oscillator 105 170Mhz local oscillation signals be mixed, the 1575.42Mhz after being reduced,
Tri- signals of 1227.6Mhz, 1561.098Mhz, while also three image signals：1235.42MHz,1567.6Mhz,
1221.098, these signals pass through the second RF switch 106, deliver to the second wave filter 112, after filtering after, 1235.42MHz,
1567.6Mhz, 1221.098 3 unwanted mirror image amplitudes are minimized.Filtered signal delivers to program control adjustable attenuator
113, the attenuation amplitude of program control adjustable attenuator 113 is controlled by controlling and storing computer 111 by I/O expanders 115, to obtain
Suitable signal intensity.Signal after decay delivers to transmitting antenna 114.So far, the signal of recording is reduced.
It should be appreciated that above-described embodiment is only used for, present invention is described, not to scope of patent protection of the present invention
Limitation, one of ordinary skill in the art are not departing from the ambit of patent requirements protection of the present invention in the case where the present invention enlightens
Under, the embodiment can be replaced or is denatured, each fall within protection scope of the present invention.
Claims (10)
- A kind of 1. multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems, it is characterised in that including：For receiving GPS L1 and L2 frequency The reception antenna (101) of section and the B1 frequency ranges of the Big Dipper, low-noise amplifier (102), the first RF switch (103), second are penetrated Frequency switch (106), the 3rd RF switch (108), frequency mixer (104), local oscillator (105), the first wave filter (107), the second filtering Device (112), temperature compensation clock (109), SDR platforms (110), control and storage computer (111), I/O expanders (115), it is program control can Controlled attenuator (113), transmitting antenna (114)；The reception antenna (101), low-noise amplifier (102), the first RF switch (103), frequency mixer (104), second are penetrated Frequency switch (106), the first wave filter (107), the 3rd RF switch (108), SDR platforms (110) are sequentially connected, the local oscillator (105) it is connected with frequency mixer (104), the 3rd RF switch (108) is connected with the first RF switch (103), and described second RF switch (106), the second wave filter (112), program control adjustable attenuator (113), transmitting antenna (114) are sequentially connected, described Temperature compensation clock (109) is connected with SDR platforms (110), and the SDR platforms (110) are connected with controlling and storing computer (111), institute State control and storage computer (111) controls the first RF switch (103), the second RF switch by I/O expanders (115) (106), the 3rd RF switch (108) record the switching with playback function and the program control adjustable attenuator (113) of control, with Adjust the intensity of playback signal.
- A kind of 2. multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems according to claim 1, it is characterised in that the reception Antenna (101) is from can at least receive the active antenna of GPS L1 and L2 frequency ranges and the B1 frequency ranges of the Big Dipper, gain 30db, For receiving the signal of these three frequency ranges.
- A kind of 3. multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems according to claim 1, it is characterised in that the low noise Acoustic amplifier (102) selects microwave low-noise amplifier, and effective frequency range is in 1200Mhz to 1600Mhz, gain 25db；Using more Level microwave triode designed, designed is built or the amplifier module from model ZX60-P162LN+.
- 4. a kind of multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems according to claim 1, it is characterised in that described first RF switch (103), the second RF switch (106), the 3rd RF switch (108) use model ZX80-DR230+ hilted broadsword Double-throw RF switch, to the function switch recorded and played back.
- A kind of 5. multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems according to claim 1, it is characterised in that the mixing Device (104) uses model ADE-35MH wideband high performance mixer.
- A kind of 6. multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems according to claim 1, it is characterised in that the local oscillator (105) compensation crystal oscillator, frequency of oscillation 170Mhz are used.
- 7. a kind of multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems according to claim 1, it is characterised in that described first Wave filter (107) uses model VBFZ-1400+ wave filter, and second wave filter (112) is using three different frequency ranges Wave filter CBP-1228C+, BFCN-1575+, BFCN-1560+ combination is completed.
- A kind of 8. multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems according to claim 1, it is characterised in that the SDR Platform (110) selects HackrfONE, and the temperature compensation clock (109) uses TCXO of the working frequency for 10Mhz；The program control adjustable attenuator (113), from model ZX76-31-PN-S attenuator；The I/O expanders (115) are by single chip computer AT MEGA 128 and UART-USB interface conversion chip FDTI FT232R structures Into both, which coordinate, completes to receive control and the instruction of storage computer (111), to control the first RF switch (103), the second radio frequency Switch (106), the 3rd RF switch (108) and program control adjustable attenuator (113).
- 9. a kind of recording/playback method of multi-frequency multi-mode GNSS radiofrequency signal recording-reproducing systems using described in claim any one of 1-8, It is characterised in that it includes following steps：Step S1, the frequency of selected local oscillator (105)；Step S2, signal recording：The signal from reception antenna (101) is amplified by low-noise amplifier (102), together Shi Benzhen (105) produces a high-frequency local oscillation signal, and the signal after amplification and local oscillation signal are sent into frequency mixer (104) mixing, Obtain f1、f2、f3、f4、f5、f66 signals, by the first wave filter (107) by f1、f3、f5The larger mirror image of three frequency range spacing Target signal filter, retain f2、f4、f6Less three signals of frequency range spacing so that the spacing of three frequencies diminishes, by invalid frequency Spectrum part is squeezed out, and is then amplified filtered signal again, and signal finally is delivered into ADC device is sampled, sampling Numerical data transmission afterwards is stored to controlling and storing computer (111), in case signal playback；Step S3, signal playback：The numerical data that samples storage obtains is subjected to conversion by DAC equipment and retrieves simulation letter Number, analog signal now includes f2、f4、f6Three signals, high-frequency signal caused by local oscillator (105) and obtained simulation are believed Number it is mixed again, obtains f7、f8、f9、f10、f11、f126 signals, then by the second wave filter (112) by image signal f7、f11、 f12Filter out, only retain the f of reduction8、f9、f10These three signals needed, finally signal is entered with program control adjustable attenuator (113) Row intensity adjustment, complies with requirement.
- A kind of 10. multi-frequency multi-mode GNSS radiofrequency signal recording/playback methods according to claim 9, it is characterised in that the step Suddenly S1 is specially：The frequency of local oscillator (105) is set as flo, and flo<GPS L2 frequency ranges；The step S2, it is specially：Step a, after frequency mixer (104) mixing, L1/L2/B1 signals and the signal of local oscillator (105) can produce following signal：And frequency：f1=L1+flo；f2=L2+flo；f3=B1+flo；Difference frequency：f4=L1-flo；f5=L2-flo；f6=B1-flo；Step b, caused 6 mixed frequency signals obtain 3 less signals of frequency range spacing by the first wave filter (107), i.e., and Frequency f2With two difference frequency f4、f6；The step S3, it is specially：In the signal playback stage, again by these three frequencies f2、f4、f6Signal and floMixing, from And by signals revivification, the signal for being now mixed to obtain also has 6：And frequency：f7=f2+flo=L2+2flo；f8=f4+flo=L1-flo+flo；f9=f6+flo=B1-flo+flo；Difference frequency：f10=f2-flo=L2+flo-flo；f11=f4-flo=L1-flo-flo；f12=f6-flo=B1-flo-flo；It can be seen that and frequency f8、f9With difference frequency f10L1, B1, the L2 exactly needed, pass through in addition with three unnecessary image signals Two wave filters (112) filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109361406A (en) * | 2018-12-18 | 2019-02-19 | 中国电子科技集团公司第五十四研究所 | A kind of FDD full frequency band transceiver |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100048155A1 (en) * | 2007-01-19 | 2010-02-25 | Nec Electronics Corporation | Multi-band rf receiver |
| CN103117767A (en) * | 2013-01-15 | 2013-05-22 | 武汉大学 | Multi-mode multi-frequency global navigational satellite system receiver radio frequency front end device |
| CN205029653U (en) * | 2015-09-29 | 2016-02-10 | 广州海格通信集团股份有限公司 | Big dipper RDSS monitors receiver |
| CN105403870A (en) * | 2015-12-02 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | General signal generator for radar target simulation |
| CN207530806U (en) * | 2017-11-17 | 2018-06-22 | 武汉大学 | A kind of low cost GNSS radiofrequency signals are recorded and playback reproducer |
-
2017
- 2017-11-17 CN CN201711148437.XA patent/CN107800444B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100048155A1 (en) * | 2007-01-19 | 2010-02-25 | Nec Electronics Corporation | Multi-band rf receiver |
| CN103117767A (en) * | 2013-01-15 | 2013-05-22 | 武汉大学 | Multi-mode multi-frequency global navigational satellite system receiver radio frequency front end device |
| CN205029653U (en) * | 2015-09-29 | 2016-02-10 | 广州海格通信集团股份有限公司 | Big dipper RDSS monitors receiver |
| CN105403870A (en) * | 2015-12-02 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | General signal generator for radar target simulation |
| CN207530806U (en) * | 2017-11-17 | 2018-06-22 | 武汉大学 | A kind of low cost GNSS radiofrequency signals are recorded and playback reproducer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109361406A (en) * | 2018-12-18 | 2019-02-19 | 中国电子科技集团公司第五十四研究所 | A kind of FDD full frequency band transceiver |
| CN109361406B (en) * | 2018-12-18 | 2024-03-15 | 中国电子科技集团公司第五十四研究所 | FDD full-frequency band transceiver |
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