CN104753611B - Frequency conversion system and method based on frequency spectrograph - Google Patents
Frequency conversion system and method based on frequency spectrograph Download PDFInfo
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Abstract
This application discloses a kind of frequency conversion system based on frequency spectrograph and method, system includes：Radio frequency converting unit, AD conversion unit, Digital Down Convert unit, data acquisition unit and data processing unit, method include：1) frequency conversion is the data signal of intermediate frequency by radio frequency converting unit；2) data signal of intermediate frequency is converted into binary data by AD conversion unit；3) transmission rate of Digital Down Convert unit reduction binary data；4) data acquisition unit is acquired to binary data；5) frequency computing module carries out the first frequency computing；6) configuration of the frequency configuration module in the first frequency；7) radio frequency converting unit becomes in the time period for turning to a steady state value in first frequency, and frequency computing module carries out the computing of the second frequency, and the data signal of first frequency is converted to the data signal of intermediate frequency.The present invention solves low high cost, the stability of a system, the technical problem more than inefficiency and required process task.
Description
Technical field
The present invention relates to communication test field, specifically, be related to a kind of frequency conversion system based on frequency spectrograph and
Method.
Background technology
Frequency spectrograph is the instrument for studying electric signal spectrum structure, steady for signal distortion, percentage modulation spectral purity, frequency
The measurement of the signal parameter such as fixed degree and crosstalk, may be used to some ginsengs of the circuit systems such as measuring amplifier and filter circuit
Number, is a kind of multiduty electronic measuring instrument.
Existing digital spectrum analysis instrument using it is more be digital real-time Fourier transform (Fast Fourier
Transformation, FFT) spectrum analyzer.Digital real-time FFT spectrum analyzer passes through ADC (analog-to-digital conversion lists first
Unit) analog signal of whole frequency range is sampled, FFT computings are carried out afterwards, obtain the frequency domain information of measured signal.This frequency
Spectrometer has two kinds of implementations, and the first is achieved in that moves low frequency high-frequency signal by mixing, then passes through
High speed analog-to-digital conversion, FFT computings are carried out to a bit of frequency spectrum, obtain one section of frequency spectrum；Moved by multiple frequency spectrum table and transported with FFT
Calculate, the spectrum information in whole frequency range can be obtained.It is achieved in that for second and directly radiofrequency signal is sampled, enters in real time
Row FFT computings, obtain the spectrum information in whole frequency range.Both implementations are required for the ADC of high speed and computing superpower
Dsp processor, thus it is relatively costly.And during frequency conversion, process task is excessive, and the break period is long, serious shadow
Acoustic system performance.
Patent application document 201410382713.9 provides a kind of all-digital IF spectrum analyzer and spectrum analysis
Method.The all-digital IF spectrum analyzer includes AD conversion unit, orthogonal digital low-converter, intermediate-frequency bandwidth filtered electrical
Road, amplitude discrimination phase discriminator, frequency counter, video filtering circuit, sample rate hoisting module, wave detector, quick scan compensation module
With control and display module.AD conversion unit in the present invention can be using the middle low speed AD conversion unit of lower cost, mould
After number converting unit is sampled to analog if signal, whole digital intermediate frequency is subsequently achieved that by the FPGA of monolithic again
Spectrum analysis, but the data acquisition and frequency during frequency-conversion processing have certain time delay between updating, and make result not
Accurately, stability is not high.
Therefore, a kind of frequency conversion system based on frequency spectrograph and method how are researched and developed, it is technology urgently to be resolved hurrily to become
Problem.
The content of the invention
The subject matter that the application is solved is to provide a kind of frequency conversion system based on frequency spectrograph and method, to solve nothing
Reduces cost, the stability of raising system, raising operating efficiency and the few technical problem of process task that method is realized.
In order to solve the above-mentioned technical problem, the invention discloses a kind of frequency conversion system based on frequency spectrograph, including：Penetrate
Frequency converting unit, AD conversion unit, Digital Down Convert unit, data acquisition unit and data processing unit, wherein,
The radio frequency converting unit, in the data signal of the frequency corresponding with the frequency of system intialization is converted to
The data signal of frequency receives the frequency that the data processing unit sends, and the frequency that the data processing unit is sent
The data signal of corresponding frequency is converted to the numeral letter of the intermediate frequency corresponding with the frequency of data processing unit transmission
Number；
The AD conversion unit, for the data signal of the intermediate frequency corresponding with the frequency to be converted into and the frequency
The corresponding binary data of point, sends to the Digital Down Convert unit；
The Digital Down Convert unit, the transmission rate for reducing the binary data corresponding with frequency；
The data acquisition unit, it is corresponding with frequency that the data acquisition unit sends to digital down-converter unit
Binary data is acquired；
The data processing unit, including frequency computing module, frequency configuration module and time block, wherein,
The frequency computing module, for carrying out computing to frequency using algorithm；
The frequency configuration module, for being configured to frequency；
The time block, for determining that the frequency computing module carries out time point and the frequency configuration mould of computing
The time point that block is configured；
The data processing unit, is additionally operable to process the binary data that the data acquisition unit sends.
Further, wherein, the data signal of the intermediate frequency, further for：The data signal of 9MHz to 12MHz.
Further, wherein, the frequency computing module, according to formula
RFOUT=(fPFD × (INT+ (FRAC/2^25))) * 2
Frequency is calculated, wherein, RFOUT is frequency, and INT+ (FRAC/2^25) is frequency dividing ratio, and INT is the integer of frequency dividing ratio
Part, FRAC is the fractional part of frequency dividing ratio, and fPFD is reference frequency.
Further, wherein, the data processing unit, further for：Single-chip microcomputer, cpu central processing unit or microprocessor
Device.
Further, wherein, the system is further comprised：Memory cell, for storing the data acquisition unit
The binary data for being gathered；
The memory cell, further for：Hard disk, FLASH memory, SD card or CF cards.
Present invention also offers a kind of frequency translation method based on frequency spectrograph, comprise the following steps：
Step 1：Radio frequency converting unit is converted to and institute the data signal of the frequency corresponding with the frequency of system intialization
State the data signal of the corresponding intermediate frequency of frequency of system intialization；
Step 2：Be converted into for the data signal of the intermediate frequency corresponding with the frequency of the system intialization by AD conversion unit
The binary data corresponding with the frequency of the system intialization, sends to Digital Down Convert unit；
Step 3：The Digital Down Convert unit reduction binary data corresponding with the frequency of the system intialization
Transmission rate；
Step 4：It is relative with the frequency of the system intialization that the data acquisition unit sends to digital down-converter unit
The binary data answered is acquired, and transmission to data processing unit is processed；
Step 5：The frequency computing module of the data processing unit carries out in the first time point that time block is set
One frequency computing；
Step 6：The frequency configuration module of the data processing unit is clicked through in the second time that the time block is set
The configuration of the frequency of row first, and by preparation after the first frequency send into radio frequency converting unit；
Step 7：The radio frequency converting unit receives the first frequency that the data processing unit sends, with described first
The corresponding first frequency change of frequency was turned in the time period of a steady state value, and the frequency computing module carries out the fortune of the second frequency
Calculate, the radio frequency converting unit is converted to and described first the data signal of the first frequency corresponding with first frequency
The data signal of the corresponding intermediate frequency of frequency.
Further, wherein, the frequency computing meets below equation：
RFOUT=(fPFD × (INT+ (FRAC/2^25))) * 2
Wherein：RFOUT is frequency；INT+ (FRAC/2^25) is frequency dividing ratio；INT is the integer part of frequency dividing ratio；FRAC is
The fractional part of frequency dividing ratio；FPFD is reference frequency.
Further, wherein, the data signal of the intermediate frequency, further for：The data signal of 9MHz to 12MHz.
Further, wherein, methods described also include step：Memory cell the data acquisition unit is gathered two
Binary data is stored.
In addition, the invention also discloses the frequency translation method that another is based on frequency spectrograph, comprising the following steps：
Step 1) radio frequency converting unit is converted to and institute the data signal of the frequency corresponding with the frequency of system intialization
State the data signal of the corresponding intermediate frequency of frequency of system intialization；
Step 2) be converted into for the data signal of the intermediate frequency corresponding with the frequency of the system intialization by AD conversion unit
The binary data corresponding with the frequency of the system intialization, sends to the Digital Down Convert unit；
Step 3) the Digital Down Convert unit reduction binary data corresponding with the frequency of the system intialization transmission
Speed；
Step 4) the frequency computing module of data processing unit carries out A frequency computings at a time points that time block is set；
Step 5) the frequency configuration module of the data processing unit carries out A frequencies at the b time points that time block is set
Configuration, and A frequencies are divided into an A frequencies and the 2nd A frequencies, then send at twice into the radio frequency converting unit；
Step 6) radio frequency converting unit receives the A frequencies that the data processing unit sends, with an A frequently
The corresponding A frequencies change of point was turned in the time period of a steady state value, and the data acquisition unit sends to digital down-converter unit
The binary data corresponding with preset frequency be acquired, the radio frequency converting unit will be with the A frequency phases
The data signal of corresponding A frequencies is converted to the data signal of the intermediate frequency corresponding with an A frequencies；
Step 7) AD conversion unit by the data signal of the intermediate frequency corresponding with an A frequencies be converted into it is described
The corresponding binary data of first A frequencies, sends to the Digital Down Convert unit；
Step 8) the Digital Down Convert unit reduction binary data corresponding with an A frequencies transmission rate；
Step 9) radio frequency converting unit receives the 2nd A frequencies that the data processing unit sends, with the 2nd A frequently
The corresponding A frequencies change of point was turned in the time period of a steady state value, and the frequency computing module carries out the computing of B frequencies, described
Radio frequency converting unit is converted to the data signal of the A frequency corresponding with the 2nd A frequencies relative with the 2nd A frequencies
The data signal of the intermediate frequency answered.
Compared with prior art, frequency conversion system and method based on frequency spectrograph described herein, have reached as follows
Effect：
(1) frequency conversion system based on frequency spectrograph of the present invention, its data processing unit includes, frequency computing mould
Block, frequency configuration module and time block, time point and the frequency of computing are carried out by time block control frequency computing module
The time point that configuration module is configured so that carry out frequency match somebody with somebody postpone wait power stability time in, Ke Yijin
The computing of the next frequency of row；
(2) frequency conversion system based on frequency spectrograph of the present invention, be greatly improved system stability and
Operating efficiency, is not used in using dedicated frequency control chip in frequency spectrograph, reduces cost；
(3) frequency translation method based on frequency spectrograph of the present invention, its step is simple, easy to operate, and is gathered
Binary data it is reliable and stable.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes a part of the invention, this hair
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the overall structure figure of the frequency conversion system based on frequency spectrograph described in the embodiment of the present invention 1；
Fig. 2 is the particular flow sheet of the frequency conversion system based on frequency spectrograph described in the embodiment of the present invention 2；
Fig. 3 is the particular flow sheet of the frequency translation method based on frequency spectrograph described in the embodiment of the present invention 3.
Specific embodiment
Some vocabulary have such as been used to censure specific components in the middle of specification and claim.Those skilled in the art should
It is understood that hardware manufacturer may call same component with different nouns.This specification and claims are not with name
The difference of title is used as distinguishing the mode of component, but the difference with component functionally is used as the criterion distinguished.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer to that in receivable error range, those skilled in the art can solve described in the range of certain error
Technical problem, basically reaches the technique effect.Additionally, " coupling " one word herein comprising it is any directly and indirectly electric property coupling
Means.Therefore, if a first device is coupled to a second device described in text, representing the first device can direct electrical coupling
The second device is connected to, or the second device is electrically coupled to indirectly by other devices or coupling means.Specification
Subsequent descriptions be implement the application better embodiment, so it is described description be for the purpose of the rule for illustrating the application,
It is not limited to scope of the present application.The protection domain of the application ought be defined depending on the appended claims person of defining.
The application is described in further detail below in conjunction with accompanying drawing, but not as the restriction to the application.
Embodiment 1
As shown in figure 1, be a kind of frequency conversion system based on frequency spectrograph of the present invention, including：Radio frequency conversion is single
Unit 1, AD conversion unit 2, Digital Down Convert unit 3, data acquisition unit 4 and data processing unit 5, wherein,
The radio frequency converting unit 1, for the data signal of the frequency corresponding with the frequency of system intialization to be converted to
The data signal of intermediate frequency receives the frequency that the data processing unit 5 sends, and the data processing unit 5 is sent
The data signal of the corresponding frequency of frequency is converted to the number of the intermediate frequency corresponding with the frequency of the transmission of the data processing unit 5
Word signal；
The AD conversion unit 2 is relative with frequency for the data signal of the intermediate frequency corresponding with frequency to be converted into
The binary data answered, sends to the Digital Down Convert unit 3；
The AD conversion unit 2, is that the analog quantity after comparing treatment with standard volume (or reference quantity) is converted into
The analog-digital converter of the discrete signal represented with binary numeral, abbreviation ADC or A/D converter.Generally with the numeral letter of output
Number digit how much expressions.The digit of the data signal that AD conversion unit 2 can be exported accurately is more, represents converter energy
The ability for enough differentiating input signal is stronger, and the performance of converter is also better.A/D conversions typically will be through over-sampling, holding, quantization
And 4 processes of coding.In side circuit, some processes merge to be carried out, and is such as sampled and is kept, and is quantified and is encoded in conversion
During be simultaneously realize.
The Digital Down Convert unit 3, the transmission rate for reducing the binary data corresponding with frequency；
Digital Down Convert unit 3 described here, reduces the transmission rate of the binary data, is beneficial to frequency spectrograph pair
Frequency spectrum is analyzed.Generally, the scope of transmission rate reduction is unfixed, is true according to the configuration parameter of frequency spectrograph
Fixed.
The data acquisition unit 4, for the binary data corresponding with frequency sent to digital down-converter unit 3
It is acquired；
The data processing unit 5, including frequency computing module 51, frequency configuration module 52 and time block 53, wherein,
The frequency computing module 51, for carrying out computing to frequency using algorithm；
Preferably, the frequency computing module 51, according to formula
RFOUT=(fPFD × (INT+ (FRAC/2^25))) * 2
Frequency is calculated, wherein, RFOUT is frequency, and INT+ (FRAC/2^25) is frequency dividing ratio, and INT is the integer of frequency dividing ratio
Part, FRAC is the fractional part of frequency dividing ratio, and fPFD is reference frequency.
In addition, 2^25 here refers to 2 25 power.
According to the frequency transmitted in radio frequency converting unit 1, the integer part of the frequency dividing ratio is 23-4095, described point
The fractional part of frequency ratio is 1~225-1, and frequency is calculated by the method, according to the frequency for calculating, frequency is matched somebody with somebody
Put.
The frequency dividing ratio is the ratio of expected frequency and the reference frequency；The expected frequency is using frequency spectrum for user
When instrument is tested, the desired frequency for obtaining is known.
The frequency configuration module 52, for being configured to frequency；
The time block 53, for determining that the frequency computing module 51 carries out the time point of computing and the frequency is matched somebody with somebody
Put the time point that module 52 is configured.
The data processing unit 5, is additionally operable to process the binary data of the transmission of the data acquisition unit 4.
Preferably, the data signal of the intermediate frequency, further for：The data signal of 9MHz to 12MHz.
Preferably, the radio frequency converting unit 1 also includes oscillator, for producing local oscillation circuit, the oscillator to enter one
Walk is YIG oscillator or voltage controlled oscillator.
The YIG oscillator is using magnetic field technique tuned frequency in a resonator；The voltage controlled oscillator refers to
Refer to that output frequency has the oscillating circuit (VCO) of corresponding relation with input control voltage, frequency is the function of applied signal voltage
Oscillator VCO, the working condition of oscillator or the component parameters of oscillation circuit are controlled by input control voltage, so that it may constitute one
Individual voltage controlled oscillator.The type of voltage controlled oscillator has LC voltage controlled oscillators, RC voltage controlled oscillators and phase noise.
Preferably, the system is further comprised：Memory cell, for storing what the data acquisition unit was gathered
Binary data；
The memory cell, further for：Hard disk, FLASH memory, SD card or CF cards.
In addition, the steady state value described in the present embodiment 1, this steady state value is really the stationary value of frequency, is specifically being tested
When, fluctuating slightly is might have, but do not influence frequency transformation of the invention.
Embodiment 2
As shown in Fig. 2 the invention also discloses a kind of frequency translation method based on frequency spectrograph, comprising the following steps：
Step 1：Radio frequency converting unit is converted to and institute the data signal of the frequency corresponding with the frequency of system intialization
State the data signal of the corresponding intermediate frequency of frequency of system intialization；
Step 2：Be converted into for the data signal of the intermediate frequency corresponding with the frequency of the system intialization by AD conversion unit
The binary data corresponding with the frequency of the system intialization, sends to the Digital Down Convert unit；
Step 3：The transmission of the Digital Down Convert unit reduction binary data corresponding with the frequency of the system intialization
Speed；
Step 4：It is relative with the frequency of the system intialization that the data acquisition unit sends to digital down-converter unit
The binary data answered is acquired, and transmission to data processing unit is processed；
Step 5：The frequency computing module of data processing unit carries out the first frequency in the first time point that time block is set
Point processing；
Step 6：The frequency configuration module of the data processing unit carries out at the second time point that time block is set
The configuration of one frequency, and by preparation after the first frequency send into radio frequency converting unit；
Step 7：Radio frequency converting unit receives the first frequency that the data processing unit sends, with first frequency
Corresponding first frequency change was turned in the time period of a steady state value, and the frequency computing module carries out the computing of the second frequency,
The radio frequency converting unit is converted to and the described first frequency the data signal of the first frequency corresponding with first frequency
The data signal of the corresponding intermediate frequency of point.
Preferably, the computing of the first frequency of the step 5 meets below equation,
RFOUT=(fPFD × (INT+ (FRAC/2^25))) * 2
Frequency is calculated, wherein, RFOUT is frequency, and INT+ (FRAC/2^25) is frequency dividing ratio, and INT is the integer of frequency dividing ratio
Part, FRAC is the fractional part of frequency dividing ratio, and fPFD is reference frequency.
In addition, 2^25 here refers to 2 25 power.
According to the frequency transmitted in radio frequency converting unit, the integer part of the frequency dividing ratio is 23-4095, the frequency dividing
The fractional part of ratio is 1~225-1, and frequency is calculated by the method, according to the frequency for calculating, frequency is configured.
The frequency dividing ratio is the ratio of expected frequency and the reference frequency；The expected frequency is using frequency spectrum for user
It is known when instrument is tested, it is desirable to the frequency for obtaining.
Preferably, the data signal of the intermediate frequency, further for：The data signal of 9MHz to 12MHz.
Preferably, methods described also includes step：The binary number that memory cell is gathered to the data acquisition unit
According to being stored.
In addition, the steady state value described in the present embodiment 2, this steady state value is really the stationary value of frequency, is specifically being tested
When, fluctuating slightly is might have, but do not influence frequency transformation of the invention.
Embodiment 3
As shown in figure 3, a kind of frequency translation method based on frequency spectrograph of the present invention, specifically includes following steps：
Step 1) radio frequency converting unit is converted to and institute the data signal of the frequency corresponding with the frequency of system intialization
State the data signal of the corresponding intermediate frequency of frequency of system intialization；
Step 2) be converted into for the data signal of the intermediate frequency corresponding with the frequency of the system intialization by AD conversion unit
The binary data corresponding with the frequency of the system intialization, sends to Digital Down Convert unit；
Step 3) the Digital Down Convert unit reduction binary data corresponding with the frequency of the system intialization transmission
Speed；
Step 4) the frequency computing module of data processing unit carries out A frequency computings at a time points that time block is set；
Step 5) the frequency configuration module of the data processing unit carries out A frequencies at the b time points that time block is set
Configuration, and A frequencies are divided into an A frequencies and the 2nd A frequencies, then send at twice into the radio frequency converting unit；
Step 6) radio frequency converting unit receives the A frequencies that the data processing unit sends, with an A frequently
The corresponding A frequencies of point become and turn in the time period of a steady state value, data acquisition unit digital down-converter unit is sent with
The corresponding binary data of preset frequency is acquired, and the radio frequency converting unit will be corresponding with an A frequencies
The data signal of A frequencies be converted to the data signal of the intermediate frequency corresponding with an A frequencies；
Step 7) AD conversion unit by the data signal of the intermediate frequency corresponding with an A frequencies be converted into it is described
The corresponding binary data of first A frequencies, sends to the Digital Down Convert unit；
Step 8) the Digital Down Convert unit reduction binary data corresponding with an A frequencies transmission rate；
Step 9) radio frequency converting unit receives the 2nd A frequencies that the data processing unit sends, with the 2nd A frequently
The corresponding A frequencies change of point was turned in the time period of a steady state value, and the frequency computing module carries out the computing of B frequencies, described
Radio frequency converting unit is converted to the data signal of the A frequency corresponding with the 2nd A frequencies relative with the 2nd A frequencies
The data signal of the intermediate frequency answered.
Preferably, the computing of the B frequencies of the computing of the A frequencies of the step 4 and step 9 meets below equation,
RFOUT=(fPFD × (INT+ (FRAC/2^25))) * 2
Frequency is calculated, wherein, RFOUT is frequency, and INT+ (FRAC/2^25) is frequency dividing ratio, and INT is the integer of frequency dividing ratio
Part, FRAC is the fractional part of frequency dividing ratio, and fPFD is reference frequency.
In addition, 2^25 here refers to 2 25 power.
According to the data signal of the frequency transmitted in radio frequency converting unit, the integer part of the frequency dividing ratio is 23-
4095, the fractional part of the frequency dividing ratio is 1~225-1, and frequency is calculated by the method, right according to the frequency for calculating
Frequency is configured.
The frequency dividing ratio is the ratio of expected frequency and the reference frequency；The expected frequency is using frequency spectrum for user
It is known when instrument is tested, it is desirable to the frequency for obtaining.
Preferably, the data signal of the intermediate frequency, further for：The data signal of 9MHz to 12MHz.
Preferably, methods described also includes step：The binary number that memory cell is gathered to the data acquisition unit
According to being stored.
In the step of the present embodiment 35, A frequencies are divided into an A frequencies and the 2nd A frequencies, then send at twice to
In the radio frequency converting unit；Here A frequencies, it can be understood as be that first is entered after frequency preset after starting shooting is configured
The frequency of row computing；And A frequencies are divided into an A frequencies and the 2nd A frequencies, A frequencies are mainly divided into two parts here, so
Send at twice afterwards into the radio frequency converting unit.
In addition, the steady state value described in the present embodiment 3, this steady state value is really the stationary value of frequency, is specifically being tested
When, fluctuating slightly is might have, but do not influence frequency transformation of the invention.
Embodiment 4
The invention also discloses an Application Example of the frequency conversion system based on frequency spectrograph, specifically include：
First, preset one initial frequency in systems, radio frequency converting unit will be relative with initial frequency preset in system
The data signal of the frequency answered is converted to the data signal of intermediate frequency；The data signal of the intermediate frequency described in the present embodiment is further
The data signal of 10.7MHZ, AD conversion unit is by the data signal of the intermediate frequency corresponding with initial frequency preset in system
The binary data corresponding with initial frequency preset in the system is converted into, is sent to the Digital Down Convert unit；
The transmission rate of the Digital Down Convert unit reduction binary data corresponding with initial frequency preset in the system；It is described
The binary data corresponding with initial frequency preset in the system that data acquisition unit sends to digital down-converter unit
It is acquired, and transmission to data processing unit is processed.
The frequency computing module of data processing unit carries out the first frequency computing in the first time point that time block is set；
Such as, first time point here is set to 0, and frequency computing generally requires the time of 5 microseconds, but is not limited to 5 microseconds, root
Depending on concrete condition；The frequency configuration module of the data processing unit carries out at the second time point that time block is set
The configuration of one frequency, and by preparation after the first frequency send into radio frequency converting unit；Here can be by second time point
It is set to the moment of 5 microseconds；Due to the first frequency is sent during into radio frequency converting unit, system frequency is generally required after changing
Stablize 5 microseconds, just the time with frequency computing match, receive what the data processing unit sent in radio frequency converting unit
During the first frequency, i.e., become in the time period for turning to a steady state value in the first frequency corresponding with first frequency, and now
Between the section frequency computing module just can be used to carry out the computing of the second frequency, the radio frequency converting unit will be with described
The data signal of the corresponding first frequency of one frequency is converted to the data signal of the intermediate frequency corresponding with first frequency.
Then, be converted into the data signal of the intermediate frequency corresponding with first frequency and described by AD conversion unit
The corresponding binary data of one frequency, sends to the Digital Down Convert unit；Digital Down Convert unit reduction described two is entered
The transmission rate of data processed；At the 3rd time point that data acquisition unit is set in time block, the moment of usually 10 microseconds enters
The collection of the binary data that the row AD conversion unit corresponding with the first frequency sends；Now due to having been carried out second
The computing of frequency, then next step is to the second frequency with regard to can directly configure, and by preparation after the second frequency send to penetrating
In frequency converting unit.
Radio frequency converting unit receives the second frequency that the data processing unit sends, corresponding with second frequency
Second frequency become turn in the time period of a steady state value, the frequency computing module carries out the computing of the 3rd frequency, described to penetrate
The data signal of the second frequency corresponding with second frequency is converted to frequency converting unit the data signal of the intermediate frequency.
And then circulate operation, and so on, can save it is unnecessary it is treated come journey, without setting chip, save resources, and frequency again
Rate is more stablized.
In addition, the steady state value described in the present embodiment 4, this steady state value is really the stationary value of frequency, is specifically being tested
When, fluctuating slightly is might have, but do not influence frequency transformation of the invention.
Embodiment 5
In addition, the invention also discloses another Application Example of the frequency conversion system based on frequency spectrograph, specifically
For：
First, preset one initial frequency in systems, radio frequency converting unit will be relative with initial frequency preset in system
The data signal of the frequency answered is converted to the data signal of intermediate frequency；The data signal of the intermediate frequency described in the present embodiment is further
The data signal of 10.7MHZ, AD conversion unit is by the data signal of the intermediate frequency corresponding with initial frequency preset in system
The binary data corresponding with initial frequency preset in the system is converted into, is sent to the Digital Down Convert unit；
The transmission rate of the Digital Down Convert unit reduction binary data corresponding with initial frequency preset in the system.
Then, the frequency computing module of data processing unit carries out A frequency computings at a time points that time block is set；
Such as, a time points here are set to 0, and frequency computing generally requires the time of 5 microseconds, but are not limited to 5 microseconds, according to
Depending on concrete condition；The frequency configuration module of the data processing unit carries out A frequencies at the b time points that time block is set
Configuration, and A frequencies are divided into an A frequencies and the 2nd A frequencies, then send at twice into the radio frequency converting unit, this
In b time points can be set to moment of 5 microseconds.
Due to an A frequencies are sent during into the radio frequency converting unit, generally required after changing due to system frequency
Stablize 5 microseconds, the time of lucky data acquisition unit gathered data matches, therefore, radio frequency converting unit receives the data
The A frequencies that processing unit sends, the time period for turning to a steady state value is become in the A frequencies corresponding with an A frequencies
Interior, it is corresponding with preset frequency that data acquisition unit described in time period can just send to digital down-converter unit
Binary data is acquired, and the radio frequency converting unit turns the data signal of the A frequency corresponding with an A frequencies
It is changed to the data signal of the intermediate frequency corresponding with an A frequencies；
Then, AD conversion unit by the data signal of the intermediate frequency corresponding with an A frequencies be converted into it is described
The corresponding binary data of first A frequencies, sends to the Digital Down Convert unit；Digital Down Convert unit reduction with it is described
The transmission rate of the corresponding binary data of the first A frequencies.
Radio frequency converting unit receives the 2nd A frequencies that the data processing unit sends, relative with the 2nd A frequencies
The digital signal change of the A frequencies answered is that in the time period of a steady state value, the frequency computing module carries out the computing of B frequencies,
The radio frequency converting unit is converted to and the 2nd A frequencies data signal of the A frequency corresponding with the 2nd A frequencies
The data signal of corresponding intermediate frequency.
Then, AD conversion unit by the data signal of the intermediate frequency corresponding with the 2nd A frequencies be converted into it is described
The corresponding binary data of 2nd A frequencies, sends to the Digital Down Convert unit；Digital Down Convert unit reduction with it is described
The transmission rate of the corresponding binary data of the 2nd A frequencies.
Because the computing of B frequencies has been completed, therefore, B frequencies can now be prepared, and B frequencies are divided into
One B frequencies and the 2nd B frequencies, and then circulate operation, and so on, can save it is unnecessary it is treated come journey, without setting again
Chip, save resources, and frequency is put more to stablize.
In the step of the present embodiment 55, A frequencies are divided into an A frequencies and the 2nd A frequencies, then send at twice to
In the radio frequency converting unit；Here A frequencies, it can be understood as be that first is entered after frequency preset after starting shooting is configured
The frequency of row computing；And A frequencies are divided into an A frequencies and the 2nd A frequencies, A frequencies are mainly divided into two parts here, so
Send at twice afterwards into the radio frequency converting unit.
In addition, the steady state value described in the present embodiment 4, this steady state value is really the stationary value of frequency, is specifically being tested
When, fluctuating slightly is might have, but do not influence frequency transformation of the invention.
Compared with prior art, frequency conversion system and method based on frequency spectrograph described herein, have reached as follows
Effect：
(1) frequency conversion system based on frequency spectrograph of the present invention, its oscillator includes data acquisition unit, frequency
Computing module, frequency configuration module and time block, by time block control data collecting unit, frequency computing module, frequency
The time point of point configuration module, so that in frequency is carried out with the time for postponing wait power stability, next frequency can be carried out
The computing of point.
(2) frequency conversion system based on frequency spectrograph of the present invention, be greatly improved system stability and
Operating efficiency, is not used in using special chip in frequency spectrograph, reduces cost.
(3) frequency translation method based on frequency spectrograph of the present invention, its step is simple, easy to operate, and is gathered
Data stabilization reliability.
Because method part has been described in detail to the embodiment of the present application, the system to being related in embodiment here
Expansion with method corresponding part describes to omit, and repeats no more.Method is referred to for the description of particular content in system to implement
The content of example is no longer specific here to limit.
Described above has shown and described some preferred embodiments of the application, but as previously described, it should be understood that the application
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and can be used for various other combinations,
Modification and environment, and can be in application contemplated scope described herein, by above-mentioned teaching or the technology or knowledge of association area
It is modified.And the change and change that those skilled in the art are carried out do not depart from spirit and scope, then all should be in this Shen
Please be in the protection domain of appended claims.
Claims (10)
1. a kind of frequency conversion system based on frequency spectrograph, it is characterised in that including：Radio frequency converting unit, AD conversion unit,
Digital Down Convert unit, data acquisition unit and data processing unit, wherein,
The radio frequency converting unit, for the data signal of the frequency corresponding with the frequency of system intialization to be converted into intermediate frequency
Data signal receives the frequency that the data processing unit sends, and the frequency that the data processing unit is sent is relative
The data signal of the frequency answered is converted to the data signal of the intermediate frequency corresponding with the frequency of data processing unit transmission；
The AD conversion unit, for the data signal of the intermediate frequency corresponding with the frequency to be converted into and the frequency phase
Corresponding binary data, sends to the Digital Down Convert unit；
The Digital Down Convert unit, the transmission rate for reducing the binary data corresponding with frequency；
The data acquisition unit, the data acquisition unit enters to two corresponding with frequency that digital down-converter unit sends
Data processed are acquired；
The data processing unit, including frequency computing module, frequency configuration module and time block, wherein,
The frequency computing module, for carrying out computing to frequency using algorithm；
The frequency configuration module, for being configured to frequency；
The time block, for determining that the frequency computing module carries out the time point of computing and the frequency configuration module is entered
The time point of row configuration；
The data processing unit, is additionally operable to process the binary data that the data acquisition unit sends.
2. the frequency conversion system based on frequency spectrograph according to claim 1, it is characterised in that the numeral letter of the intermediate frequency
Number, further for：The data signal of 9MHz to 12MHz.
3. the frequency conversion system based on frequency spectrograph according to claim 1, it is characterised in that the frequency computing mould
Block, frequency is calculated according to formula RFOUT=(fPFD × (INT+ (FRAC/2^25))) * 2, wherein, RFOUT is frequency, INT+
(FRAC/2^25) it is frequency dividing ratio, INT is the integer part of frequency dividing ratio, and FRAC is the fractional part of frequency dividing ratio, and fPFD is with reference to frequency
Rate.
4. the frequency conversion system based on frequency spectrograph according to claim 1, it is characterised in that the data processing list
Unit, further for：Single-chip microcomputer, cpu central processing unit or microprocessor.
5. the frequency conversion system based on frequency spectrograph according to claim 1, it is characterised in that the system, further
Also include：Memory cell, for storing the binary data that the data acquisition unit is gathered；
The memory cell, further for：Hard disk, FLASH memory, SD card or CF cards.
6. a kind of frequency translation method based on frequency spectrograph, it is characterised in that comprise the following steps：
Step 1：Radio frequency converting unit is converted to and the system data signal of the frequency corresponding with the frequency of system intialization
The data signal of the corresponding intermediate frequency of the preset frequency of system；
Step 2：Be converted into the data signal of the intermediate frequency corresponding with the frequency of the system intialization and institute by AD conversion unit
The corresponding binary data of the frequency of system intialization is stated, is sent to Digital Down Convert unit；
Step 3：The transmission of the Digital Down Convert unit reduction binary data corresponding with the frequency of the system intialization
Speed；
Step 4：Two corresponding with the frequency of the system intialization that data acquisition unit sends to digital down-converter unit enter
Data processed are acquired, and transmission to data processing unit is processed；
Step 5：The frequency computing module of the data processing unit carries out the first frequency in the first time point that time block is set
Point processing；
Step 6：The frequency configuration module of the data processing unit carries out the first frequency at the second time point that time block is set
The configuration of point, and will be sent into the radio frequency converting unit with the first frequency for postponing；
Step 7：The radio frequency converting unit receives the first frequency that the data processing unit sends, with first frequency
Corresponding first frequency change was turned in the time period of a steady state value, and the frequency computing module carries out the computing of the second frequency,
The radio frequency converting unit is converted to and the described first frequency the data signal of the first frequency corresponding with first frequency
The data signal of the corresponding intermediate frequency of point.
7. the frequency translation method based on frequency spectrograph according to claim 6, it is characterised in that the frequency computing meets
Below equation：
RFOUT=(fPFD × (INT+ (FRAC/2^25))) * 2,
Wherein：RFOUT is frequency；INT+ (FRAC/2^25) is frequency dividing ratio；INT is the integer part of frequency dividing ratio；FRAC is frequency dividing
The fractional part of ratio；FPFD is reference frequency.
8. the frequency translation method based on frequency spectrograph according to claim 6, it is characterised in that the numeral letter of the intermediate frequency
Number, further for：The data signal of 9MHz to 12MHz.
9. the frequency translation method based on frequency spectrograph according to claim 6, it is characterised in that methods described also includes step
Suddenly：Memory cell is stored to the binary data that the data acquisition unit is gathered.
10. a kind of frequency translation method based on frequency spectrograph, it is characterised in that comprise the following steps：
Step 1) radio frequency converting unit is converted to and the system data signal of the frequency corresponding with the frequency of system intialization
The data signal of the corresponding intermediate frequency of the preset frequency of system；
Step 2) be converted into the data signal of the intermediate frequency corresponding with the frequency of the system intialization and institute by AD conversion unit
The corresponding binary data of the frequency of system intialization is stated, is sent to Digital Down Convert unit；
Step 3) the Digital Down Convert unit reduction binary data corresponding with the frequency of the system intialization transmission
Speed；
Step 4) the frequency computing module of data processing unit carries out A frequency computings at a time points that time block is set；
Step 5) the frequency configuration module of the data processing unit carries out matching somebody with somebody for A frequencies at the b time points that time block is set
Put, and A frequencies are divided into an A frequencies and the 2nd A frequencies, then send at twice into the radio frequency converting unit；
Step 6) the radio frequency converting unit receives the A frequencies that the data processing unit sends, with an A frequently
The corresponding A frequencies of point become and turn in the time period of a steady state value, data acquisition unit digital down-converter unit is sent with
The corresponding binary data of preset frequency is acquired, and the radio frequency converting unit will be corresponding with an A frequencies
The data signal of A frequencies be converted to the data signal of the intermediate frequency corresponding with an A frequencies；
Step 7) AD conversion unit by the data signal of the intermediate frequency corresponding with an A frequencies be converted into it is described
The corresponding binary data of first A frequencies, sends to the Digital Down Convert unit；
Step 8) the Digital Down Convert unit reduction binary data corresponding with an A frequencies transmission rate；
Step 9) the radio frequency converting unit receives the 2nd A frequencies that the data processing unit sends, with the 2nd A frequently
The corresponding A frequencies change of point was turned in the time period of a steady state value, and the frequency computing module carries out the computing of B frequencies, described
Radio frequency converting unit is converted to the data signal of the A frequency corresponding with the 2nd A frequencies relative with the 2nd A frequencies
The data signal of the intermediate frequency answered.
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| CN1987515A (en) * | 2005-12-22 | 2007-06-27 | 凹凸科技（中国）有限公司 | Method and systme for realizing GPS positioning under weak signal environment |
| CN101075814A (en) * | 2007-05-10 | 2007-11-21 | 京信通信系统（中国）有限公司 | Digital receiver system based on special digital medium-frequency structure |
| CN201464557U (en) * | 2009-03-16 | 2010-05-12 | 邵啸 | Intermediate frequency spectrum monitoring device |
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| US6570527B1 (en) * | 2001-09-28 | 2003-05-27 | Arraycomm, Inc. | Calibration of differential frequency-dependent characteristics of a radio communications system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987515A (en) * | 2005-12-22 | 2007-06-27 | 凹凸科技（中国）有限公司 | Method and systme for realizing GPS positioning under weak signal environment |
| CN101075814A (en) * | 2007-05-10 | 2007-11-21 | 京信通信系统（中国）有限公司 | Digital receiver system based on special digital medium-frequency structure |
| CN201464557U (en) * | 2009-03-16 | 2010-05-12 | 邵啸 | Intermediate frequency spectrum monitoring device |
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