CN106405585B - A kind of RF signal collection back method and device - Google Patents
A kind of RF signal collection back method and device Download PDFInfo
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- CN106405585B CN106405585B CN201610757776.7A CN201610757776A CN106405585B CN 106405585 B CN106405585 B CN 106405585B CN 201610757776 A CN201610757776 A CN 201610757776A CN 106405585 B CN106405585 B CN 106405585B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
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- Radar, Positioning & Navigation (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
This application provides a kind of RF signal collection back method and devices, it is related to radio frequency arts, this method comprises: receiving antenna receives the radiofrequency signal of navigation satellite transmitting, first channel processing equipment handles radiofrequency signal, the first analog if signal is obtained, analog-to-digital conversion equipment carries out AD transformation to the first analog if signal, obtains digital intermediate frequency signal, FPGA acquires digital intermediate frequency signal, and it is stored in memory；When needing to play back, FPGA reads digital intermediate frequency signal from memory, and carries out DA transformation, obtains the second analog if signal, and second channel processing equipment obtains output signal after handling the second analog if signal.By aforesaid operations, people's requirement of the environment to positioning navigating device progress real satellite signal testing indoors is met.
Description
Technical field
The present invention relates to radio frequency arts more particularly to a kind of RF signal collection back methods and device.
Background technique
With navigation system build up and the fast development of location and navigation technology, positioning of the people to positioning navigating device
The requirement of precision and location availability is higher and higher.In order to meet scientific research and test needs, navigation signal simulator comes into being.
Navigation signal simulator solves navigation the relevant technologies development problem to a certain extent and navigation equipment is produced in test
Some practical problems.
But emulation signal can be generated when application navigation simulator, there are sizable differences between actual signal.Example
Such as, in the preventing test of navigation equipment, actual road conditions may be considerably complicated, and navigation simulator can not make similar field
Scape.Therefore, when carrying out anti-multipath and Anti-Jamming Technique is tackled key problems, it is difficult to be constructed using navigation simulator very true more
Diameter environment and compacting interference environment.
In view of the foregoing, more accurately way is at present, and actual navigation satellite signal is recorded, and is needing
Shi Jinhang playback process.But navigation satellite signal playback apparatus on the market is largely digital intermediate frequency playback, is only applicable to
Professional research staff carries out the research of capture, the tracking of navigation satellite digital intermediate frequency signal in laboratory, and existing radio frequency
Playback apparatus volume is big, power consumption is high, form fixation is unfavorable for extending, it is difficult to meet people and play back in general occasion to radiofrequency signal
The requirement of processing.
Summary of the invention
In view of this, the embodiment of the present invention is designed to provide a kind of RF signal collection back method and device, lead to
It crosses and a series of transformation is carried out to radiofrequency signal, improve the authenticity and convenience that positioning navigating device is tested and development environment uses
Property.
In a first aspect, the embodiment of the invention provides a kind of RF signal collection back methods, comprising: receiving antenna receives
The radiofrequency signal of navigation satellite transmitting；
First channel processing equipment handles radiofrequency signal, obtains the first analog if signal；
Analog-to-digital conversion equipment carries out AD transformation to the first analog if signal, obtains digital intermediate frequency signal；
FPGA acquires digital intermediate frequency signal, and it is stored in memory；When needing to play back, FPGA is from storage
Digital intermediate frequency signal is read in device, and carries out DA transformation, obtains the second analog if signal；
Second channel processing equipment obtains output signal after handling the second analog if signal.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein the
One channel processing equipment handles radiofrequency signal, obtain the first analog if signal the following steps are included:
First power splitter carries out two function point to radiofrequency signal, obtains first via radiofrequency signal and the second tunnel radiofrequency signal, right
First via radiofrequency signal carries out four function and gets multi-channel rf signal；
SAW filter is to the first via and multi-channel rf signal carry out sound table filtering；
The filtered first via of sound table and multi-channel rf signal are downconverted to intermediate frequency by down-converted device, obtain first
Road and multichannel intermediate-freuqncy signal；
The first via and multichannel intermediate-freuqncy signal are combined by combiner, obtain the first combining intermediate-freuqncy signal, and first is closed
Road intermediate-freuqncy signal obtains the first analog if signal by if bandpas filter.
With reference to first aspect, the embodiment of the invention provides second of possible embodiments of first aspect, wherein the
Two data processing equipments obtain output signal after handling the second analog if signal the following steps are included:
Second power splitter carries out function point processing to the second analog if signal, obtains multi-channel analog intermediate-freuqncy signal；
Upconversion process device carries out upconversion process to multi-channel analog intermediate-freuqncy signal according to local oscillator, obtains multichannel up-conversion letter
Number；
Bandpass filter, to multichannel up-conversion signal carry out bandpass filtering, and by filtered multichannel up-conversion signal into
Row combining, obtains the second combining up-conversion signal；
Third power splitter carries out two function point to the second combining up-conversion signal, obtains first via up-conversion signal and the second tunnel
Up-conversion signal, first via up-conversion signal directly export.
The possible embodiment of second with reference to first aspect, the embodiment of the invention provides the third of first aspect
Possible embodiment, wherein second channel processing equipment obtains output signal after handling the second analog if signal
It is further comprising the steps of:
Second road frequency variation signal is sent to reference receiver, to be tested.
The third possible embodiment with reference to first aspect, the embodiment of the invention provides the 4th kind of first aspect
Possible embodiment, wherein method further include:
When receiving the radiofrequency signal of navigation satellite transmitting by array received antenna, the same external clock is introduced, by battle array
The radiofrequency signal of column receiving antenna synchronizes acquisition playback.
Second aspect, the embodiment of the invention provides a kind of RF signal collection playback reproducers, comprising: rf signal reception
Module, for receiving the radiofrequency signal of navigation satellite transmitting；
First channel processing module obtains the first analog if signal for handling radiofrequency signal；
Analog-to-digital conversion module obtains digital intermediate frequency signal for carrying out AD transformation to the first analog if signal；
FPGA processing module stores in memory for acquiring digital intermediate frequency signal, and by it；When needing to play back
When, FPGA reads digital intermediate frequency signal from memory, and carries out DA transformation, obtains the second analog if signal；
Second channel processing module, for obtaining output signal after handling the second analog if signal.
In conjunction with second aspect, the embodiment of the invention provides the first possible embodiments of second aspect, wherein the
One channel processing module includes:
First function divides processing unit, for carrying out two function point to radiofrequency signal, obtains first via radiofrequency signal and the second tunnel
Radiofrequency signal carries out four function to first via radiofrequency signal and gets multi-channel rf signal；
Filter unit, for the first via and multi-channel rf signal carry out sound table filtering；
Frequency conversion processing unit is obtained for the filtered first via and multi-channel rf signal to be downconverted to intermediate frequency
The first via and multichannel intermediate-freuqncy signal；
It is combined processing unit, for the first via and multichannel intermediate-freuqncy signal to be combined, obtains the first combining intermediate-freuqncy signal,
And the first combining intermediate-freuqncy signal is obtained into the first analog if signal by if bandpas filter.
In conjunction with second aspect, the embodiment of the invention provides second of possible embodiments of second aspect, wherein the
Two data processing modules include:
Second function divides processing unit, for carrying out function point processing to the second analog if signal, obtains multi-channel analog intermediate frequency
Signal；
Upconversion process unit obtains multichannel for carrying out upconversion process to multi-channel analog intermediate-freuqncy signal according to local oscillator
Up-conversion signal；
Bandpass filtering unit, for carrying out bandpass filtering to multichannel up-conversion signal, and by filtered multichannel up-conversion
Signal is combined, and obtains the second combining up-conversion signal；
Third function divides processing unit, for carrying out two function point to the second combining up-conversion signal, obtains first via up-conversion
Signal and the second road frequency variation signal, first via up-conversion signal directly export.
In conjunction with second of possible embodiment of second aspect, the embodiment of the invention provides the third of second aspect
Possible embodiment, wherein second channel processing module further include:
Test module, for the second road frequency variation signal to be sent to reference receiver, to be tested.
In conjunction with the third possible embodiment of second aspect, the embodiment of the invention provides the 4th kind of second aspect
Possible embodiment, wherein further include:
Synchronised clock module, for introducing when receiving the radiofrequency signal of navigation satellite transmitting by array received antenna
The radiofrequency signal of array received antenna is synchronized acquisition playback by the same external clock.
A kind of RF signal collection back method and device provided in an embodiment of the present invention, wherein this method comprises: receiving
Antenna receives the radiofrequency signal of navigation satellite transmitting, and the first channel processing equipment handles radiofrequency signal, obtains the first mould
Quasi- intermediate-freuqncy signal, analog-to-digital conversion equipment carry out AD transformation to the first analog if signal, obtain digital intermediate frequency signal, FPGA acquisition
Digital intermediate frequency signal, and it is stored in memory, when needing to play back, FPGA reads intermediate frequency digital from memory
Signal, and DA transformation is carried out, the second analog if signal is obtained, second channel processing equipment carries out the second analog if signal
Output signal is obtained after processing.By the above-mentioned transformation carried out to radiofrequency signal, positioning navigating device test and research and development are improved
The authenticity and convenience of environment.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows a kind of flow chart of RF signal collection back method provided by the embodiment of the present invention；
Fig. 2 shows a kind of structural framing figures of RF signal collection playback reproducer provided by the embodiment of the present invention；
Fig. 3 shows a kind of realization block diagram of RF signal collection playback reproducer provided by the embodiment of the present invention；
Fig. 4 shows clock and the function branch point of a kind of RF signal collection playback reproducer provided by the embodiment of the present invention
Functional block diagram；
Fig. 5 shows a kind of function of the filtering part of RF signal collection playback reproducer provided by the embodiment of the present invention
Block diagram；
Fig. 6 shows a kind of function of the down coversion part of RF signal collection playback reproducer provided by the embodiment of the present invention
It can block diagram；
Fig. 7 shows a kind of first combining intermediate frequency letter of RF signal collection playback reproducer provided by the embodiment of the present invention
Number combining and filtering part functional block diagram；
Fig. 8 shows a kind of digital intermediate frequency signal of RF signal collection playback reproducer provided by the embodiment of the present invention and adopts
The functional block diagram of collection and playback and DA conversion section；
Fig. 9 show a kind of function of RF signal collection playback reproducer provided by the embodiment of the present invention point, up-conversion and
Up-conversion post filtering and the functional block diagram for being combined part；
Figure 10 shows a kind of second combining part of RF signal collection playback reproducer provided by the embodiment of the present invention
Functional block diagram；
Figure 11 shows the functional block of 4 acquisition received radiofrequency signals of playback reproducer synchronous acquisition array received antenna
Figure.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for describing the description of simplification of the invention, rather than the equipment of indication or suggestion meaning or component must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.Wherein, term " first position " and
" second position " is two different positions.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
The connection of two component internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Frequency point, bandwidth and the modulation system that four current large satellite navigation system are included are as shown in table 1.
1 satellite navigation system signals system of table
As shown in table 1, the signal system multiplicity of satellite navigation system, also, the frequency point of different satellite navigation systems, frequency
Etc. features it is also not identical.Therefore, in practical applications, navigation signal simulator emulation signal mode difficult to use draws up actual field
Scape.For this purpose, the present invention provides a kind of method and apparatus of RF signal collection playback, as depicted in figs. 1 and 2, to acquire back
Multimode multi-frequency navigation satellite signal is put, and the acquisition of the signals such as AM, FM, radio and television, satellite communication can be extended to and playback is answered
With passing through the transformation and processing to radiofrequency signal, the positioning accuracy of Lai Tigao navigation equipment.
Embodiment one
It is divided into 5 tunnels by the first power splitter function as Fig. 3 describes the received satellite-signal of receiving antenna, then by corresponding
SAW filter, carry out sound table filtering, and carry out down coversion and change to intermediate frequency obtains the first via and multichannel intermediate-freuqncy signal, is combined
The first via and multichannel intermediate-freuqncy signal are combined by device, obtain the first combining intermediate-freuqncy signal, and the first combining intermediate-freuqncy signal is led to
If bandpas filter is crossed, the first analog if signal is obtained.
AD sampling and binary code stream storage processing are carried out to the first analog if signal.Through FPGA from memory when playback
Binary code stream is read in part and carries out DA transformation, obtains the second analog if signal, the second power splitter believes the second analog intermediate frequency
Number carry out function point processing, obtain multi-channel analog intermediate-freuqncy signal, upconversion process device according to local oscillator to multi-channel analog intermediate-freuqncy signal into
Row upconversion process, obtains multichannel up-conversion signal, and bandpass filter carries out bandpass filtering to multichannel up-conversion signal, and by band
Multichannel up-conversion signal after pass filter is combined, and obtains the second combining up-conversion signal, and third power splitter is combined to second
Up-conversion signal carries out two function point, obtains first via up-conversion signal and the second road frequency variation signal, first via up-conversion signal
It directly exports, the second road frequency variation signal is sent to reference receiver, to be tested.
As described in Fig. 4, coaxial head J1 connection full range point navigation satellite signal receiving antenna is received after signal through one
Function after two power splitter S1 is divided to be divided into two-way, wherein being divided into 4 tunnels through one point of four power splitter function again all the way.So far, it is connect by receiving antenna
The signal of receipts is divided into 5 tunnels.Whole device default uses internal 10M reference clock, and coaxial head J2 can connect external reference clock
Input, when more acquisition playback reproducers need to synchronize in use, synchronizing each device using external reference clock.Each device of rear class
Reference clock is output of the 10M Reference clock after clock drives.
As described in Fig. 5, two function divide the output of S1 through filtered output F1_out the leading for B3 frequency point of filter F1
Navigate signal.Four function are exported respectively after dividing S2 function point to four filters, through the filtered output F2_out of filter F2 be B1 with
The navigation signal of L1 frequency point is the navigation signal of GALILEO E1 frequency point through the filtered output F3_out of filter F3, through filtering
The filtered output F4_out of wave device F4 is the navigation signal of BD2B2 frequency point and GALILEO E5a frequency point, is filtered through filter F5
Output F5_out afterwards is the navigation signal of GLONASS R1 frequency point.Each SAW filter canonical parameter is shown in Table 2.
2 SAW filter canonical parameter of table
As described in Fig. 6, identical intermediate frequency is uniformly changed to after the filtered signal in 5 tunnels is downconverted, in the present embodiment,
Intermediate frequency is set as 40M.Specific implementation is as follows:
The first via, filtered F1_out are B3 frequency point signal, frequency 1268.52MHz, local oscillator 1268.52-40=
1228.52MHz, FPGA generate local oscillator LO_1, F1_ by the frequency synthesizer ADF4360-5 with VCO that Spi_1 configures ADI
It is 40MHz that out and LO_1 generates centre frequency after frequency mixer m1 mixing, and bandwidth is the IF output signal of 20.46MHz
m1_out。
Second tunnel, filtered F2_out are BD2B1 frequency point and GPS L1 frequency point signal, centre frequency 1568MHz, sheet
Vibration is 1568-40=1528MHz, and FPGA generates local oscillator by the frequency synthesizer ADF4360-4 with VCO that Spi_2 configures ADI
It is 40MHz that LO_2, F2_out and LO_2 generate centre frequency after frequency mixer m2 mixing, and bandwidth is the intermediate frequency of 18.322MHz
Output signal m2_out.
Third road, filtered F3_out are GALILEO E1 frequency point signal, and centre frequency 1575MHz, local oscillator is
1575-40=1535MHz, FPGA generate local oscillator LO_ by the frequency synthesizer ADF4360-4 with VCO that Spi_3 configures ADI
It is 40MHz that 3, F3_out and LO_3 generates centre frequency after frequency mixer m3 mixing, and bandwidth is the IF output signal of 20MHz
m3_out。
4th tunnel, filtered F4_out is BD2B2 frequency point and GALILEO E5b frequency point signal, centre frequency are
1207MHz, local oscillator 1207-40=1167MHz, FPGA configure the frequency synthesizer with VCO of ADI by Spi_4
It is 40MHz, bandwidth that ADF4360-4, which generates local oscillator LO_4, F4_out and LO_4 and generates centre frequency after frequency mixer m4 mixing,
For the IF output signal m4_out of 20MHz.
5th tunnel, filtered F5_out are GLONASS R1 frequency point signal, and centre frequency 1602MHz, local oscillator is
1602-40=1562MHz, FPGA generate local oscillator LO_ by the frequency synthesizer ADF4360-4 with VCO that Spi_5 configures ADI
It is 40MHz that 5, F5_out and LO_5 generates centre frequency after frequency mixer m5 mixing, and bandwidth is the IF output signal of 18MHz
m5_out。
As described in Fig. 7, output m1_out, m2_out, m3_out, m4_out and m5_out after the mixing of 5 tunnels are in
Frequency is combined, and the centre frequency of the signal c1 after combining is 40MHz, and bandwidth is to be mixed the maximum bandwidth of the road Hou Ge signal
20.46MHz.It the use of centre frequency is 40MHz, bandwidth is that the intermediate-frequency filter F6 of 25MHz filters the signal c1 after combining
Wave, filtering output are F6_out.
As described in Fig. 8, the analog if signal F6_out exported after prime filtering becomes intermediate frequency after AD is converted
Digital signal D1, FPGA first latch the transformed digital signal D1 of AD when carrying out signal acquisition, then carry out parallel-serial conversion, so
Binary number is deposited into the storage mediums such as solid state hard disk or flash array according to customized frame structure after receiving acquisition instructions afterwards
According to stream.When receiving play-back command, FPGA is from the storage mediums such as solid state hard disk or flash array with the reading of customized frame structure
Binary data stream then carries out serioparallel exchange, then carries out DA and is converted into analog intermediate frequency.
As described in Fig. 9, the road analog intermediate frequency function Fen Houge signal is carried out with local oscillator when corresponding down coversion respectively
Mixing, the radiofrequency signal after obtaining up-conversion, then by corresponding filtering processing.It is embodied as follows:
The output S3_out of the first via, power splitter S3 is mixed with local oscillator LO_1, and the signal m6_out after up-conversion passes through sound
The frequency of the signal F7_out exported after table filter F7 is 40+1228.52=1268.52MHz, bandwidth 20MHz, is corresponded to
The signal of BD2B3 frequency point.
The output S3_out on the second tunnel, power splitter S3 is mixed with local oscillator LO_2, and the signal m7_out after up-conversion passes through sound
The frequency of the signal F8_out exported after table filter F8 is 40+1528=1568MHz, and bandwidth 18.322MHz covers BD
The signal of B1 frequency point and GPS L1 frequency point.
The output S3_out on third road, power splitter S3 is mixed with local oscillator LO_3, and the signal m8_out after up-conversion passes through sound
The frequency of the signal F9_out exported after table filter F9 is 40+1535=1575MHz, and bandwidth 20MHz is covered substantially
The main lobe of GALILEO E1 frequency point signal.
The output S3_out on the 4th tunnel, power splitter S3 is mixed with local oscillator LO_4, and the signal m9_out after up-conversion passes through sound
The frequency of the signal F10_out exported after table filter F10 is 40+1167=1207MHz, and bandwidth 20MHz is covered
The signal of GALILEO E5b frequency point and BD2 B2 frequency point.
The output S3_out on the 5th tunnel, power splitter S3 is mixed with local oscillator LO_5, and the signal m10_out after up-conversion passes through sound
The frequency of the signal F11_out exported after table filter F11 is 40+1562=1602MHz, and bandwidth 18MHz is covered
The signal of GLONASS R1 frequency point.
As described in Figure 10, up-conversion and filtered signal F7_out, F8_out, F9_out, F10_out and F11_
Out is combined processing and generates the signal RF_OUT_1 after combining, then divides S4 by two function, wherein signal RF_OUT is straight all the way
It connects as the radiofrequency signal finally played back, the built-in reference receiver UBLOX LEA-6S of another output to the invention device,
The function and performance of acquisition playback reproducer are verified for closed loop.
A kind of RF signal collection back method provided in this embodiment and device, having the technical effect that for the embodiment are worked as
After receiving antenna receives the radiofrequency signal of navigation satellite transmitting, radiofrequency signal is handled and AD is converted, obtains middle frequency
Word signal, FPGA acquires digital intermediate frequency signal, and it is stored in memory；When needing to play back, FPGA is from storage
Digital intermediate frequency signal is read in device, and carries out DA transformation, is finally obtained after the second analog if signal is handled and is exported
Signal.By improving the positioning accuracy of positioning navigating device with up conversion.Also, scalability is strong, and local frequency can match
It sets, can easily be realized as long as replacing filter when need to change application demand, compare current scheme, cost of implementation is low, function
It consumes low, small in size.Intermediate frequency is configured to same frequency and bandwidth, and combining storage can substantially save memory space, be obviously improved device
Signal store duration, built-in reference receiver, can closed loop test whole device function and performance.
Embodiment two
More device synchronous acquisitions and playback are needed in the occasion that more radio frequency sources acquire and play back, is used in the present embodiment outer
Reference clock of portion's clock source as whole device.It is 4 four array elements of acquisition playback reproducer synchronous acquisition as described in Figure 11
The received navigation satellite signal of anti-interference reception antenna can be used for the test of Anti-interference algorithm research and anti-interference equipment, need
It should be noted that the research staff of the art in the more radio frequency sources acquisition playback of progress, need to believe according to radio frequency is actually entered
Number power level the gain of entire link is adjusted correspondingly.
A kind of RF signal collection back method provided in this embodiment and device, having the technical effect that for the embodiment are dry
It disturbs using the more devices under environment, and guarantees that more devices are homologous using the external clock input port input clock of the device,
More array element signals synchronous acquisitions playback under interference environment can be achieved, research and development and performance inspection applied to the anti-interference product of array
It surveys.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. a kind of RF signal collection back method, it is characterised in that, include:
Receiving antenna receives the radiofrequency signal of navigation satellite transmitting；
First channel processing equipment handles the radiofrequency signal, obtains the first analog if signal；
Analog-to-digital conversion equipment carries out AD transformation to first analog if signal, obtains digital intermediate frequency signal；
FPGA acquires the digital intermediate frequency signal, and it is stored in memory, and when needing to play back, FPGA is from storage
The digital intermediate frequency signal is read in device, and carries out DA transformation, obtains the second analog if signal；
Second channel processing equipment obtains output signal after handling second analog if signal；
First channel processing equipment handles the radiofrequency signal, and obtaining the first analog if signal includes following step
It is rapid:
First power splitter carries out two function point to the radiofrequency signal, obtains first via radiofrequency signal and the second tunnel radiofrequency signal, right
The first via radiofrequency signal carries out four function and gets multi-channel rf signal；
SAW filter is to the first via radiofrequency signal and multi-channel rf signal carry out sound table filtering；
Down-converted device downconverts to the filtered first via radiofrequency signal of sound table and the multi-channel rf signal
Intermediate frequency obtains the first via and multichannel intermediate-freuqncy signal；
The first via and the multichannel intermediate-freuqncy signal are combined by combiner, obtain the first combining intermediate-freuqncy signal, and by institute
The first combining intermediate-freuqncy signal is stated by if bandpas filter, obtains first analog if signal.
2. a kind of RF signal collection back method according to claim 1 and device, which is characterized in that second letter
Road processing equipment obtain output signal after handling second analog if signal the following steps are included:
Second power splitter carries out function point processing to second analog if signal, obtains multi-channel analog intermediate-freuqncy signal；
Upconversion process device carries out upconversion process to the multi-channel analog intermediate-freuqncy signal according to local oscillator, obtains multichannel up-conversion letter
Number；
Bandpass filter carries out bandpass filtering to the multichannel up-conversion signal, and the filtered multichannel up-conversion is believed
It number is combined, obtains the second combining up-conversion signal；
Third power splitter carries out two function point to the second combining up-conversion signal, obtains first via up-conversion signal and the second tunnel
Up-conversion signal, the first via up-conversion signal directly export.
3. a kind of RF signal collection back method according to claim 2, which is characterized in that the second channel processing
It is further comprising the steps of that equipment obtains output signal after handling second analog if signal:
Second road frequency variation signal is sent to reference receiver, to be tested.
4. a kind of RF signal collection back method according to claim 3, which is characterized in that the method also includes:
When receiving the radiofrequency signal of navigation satellite transmitting by array received antenna, the same external clock is introduced, array is connect
The radiofrequency signal for receiving antenna synchronizes acquisition playback.
5. a kind of RF signal collection playback reproducer characterized by comprising
Rf signal reception module, for receiving the radiofrequency signal of navigation satellite transmitting；
First channel processing module obtains the first analog if signal for handling the radiofrequency signal；
Analog-to-digital conversion module obtains digital intermediate frequency signal for carrying out AD transformation to first analog if signal；
FPGA processing module stores in memory for acquiring the digital intermediate frequency signal, and by it；When needing to play back
When, FPGA reads the digital intermediate frequency signal from memory, and carries out DA transformation, obtains the second analog if signal；
Second channel processing module, for obtaining output signal after handling second analog if signal；
First channel processing module includes:
First function divides processing unit, for carrying out two function point to the radiofrequency signal, obtains first via radiofrequency signal and the second tunnel
Radiofrequency signal carries out four function to the first via radiofrequency signal and gets multi-channel rf signal；
Sound table filter unit, for the first via and multi-channel rf signal carry out sound table filtering；
Frequency conversion processing unit, for the filtered first via and the multi-channel rf signal to be downconverted to intermediate frequency,
Obtain the first via and multichannel intermediate-freuqncy signal；
It is combined processing unit and obtains the first combining intermediate frequency for the first via and the multichannel intermediate-freuqncy signal to be combined
Signal, and the first combining intermediate-freuqncy signal is obtained into first analog if signal by if bandpas filter.
6. a kind of RF signal collection playback reproducer according to claim 5, which is characterized in that the second channel processing
Module includes:
Second function divides processing unit, for carrying out function point processing to second analog if signal, obtains multi-channel analog intermediate frequency
Signal；
Upconversion process unit obtains multichannel for carrying out upconversion process to the multi-channel analog intermediate-freuqncy signal according to local oscillator
Up-conversion signal；
Bandpass filtering unit, for carrying out bandpass filtering to the multichannel up-conversion signal, and will be in the filtered multichannel
Frequency variation signal is combined, and obtains the second combining up-conversion signal；
Third function divides processing unit, for carrying out two function point to the second combining up-conversion signal, obtains first via up-conversion
Signal and the second road frequency variation signal, the first via up-conversion signal directly export.
7. a kind of RF signal collection playback reproducer according to claim 6, which is characterized in that the second channel processing
Module further include:
Test module, for second road frequency variation signal to be sent to reference receiver, to be tested.
8. a kind of RF signal collection playback reproducer according to claim 7, which is characterized in that further include:
Synchronised clock module, for introducing same when receiving the radiofrequency signal of navigation satellite transmitting by array received antenna
A external clock, to guarantee that synchronous acquisition plays back.
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| CN106788479B (en) * | 2017-03-17 | 2022-06-24 | 成都玖锦科技有限公司 | Single-channel radio-frequency signal acquisition playback system |
| CN107797124A (en) * | 2017-09-28 | 2018-03-13 | 北京空间技术研制试验中心 | The method of spacecraft navigation neceiver ephemeris renewal |
| CN110412622B (en) * | 2019-08-13 | 2023-05-12 | 广州广电计量检测股份有限公司 | RTK performance test system and method |
| CN110636446A (en) * | 2019-10-17 | 2019-12-31 | 众虎物联网(广州)有限公司 | Indoor positioning-based signal recording and playback method and system |
| CN110988936B (en) * | 2019-11-26 | 2022-02-25 | 中电科思仪科技股份有限公司 | Radio frequency signal recording and playback device and using method thereof |
| CN110850449B (en) * | 2020-01-15 | 2020-05-05 | 湖南卫导信息科技有限公司 | High-precision measurement type receiver testing method based on real signal recording and playing |
| CN113434427A (en) * | 2021-07-06 | 2021-09-24 | 和芯星通科技(北京)有限公司 | Method and device for realizing test verification, computer storage medium and terminal |
| CN117155456A (en) * | 2023-08-31 | 2023-12-01 | 北京中捷时代航空科技有限公司 | Array signal acquisition and playback method, system, electronic device and readable storage medium |
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