CN108243130A - Demodulation method, device, spectrum detector and computer readable storage medium - Google Patents
Demodulation method, device, spectrum detector and computer readable storage medium Download PDFInfo
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- CN108243130A CN108243130A CN201810021546.3A CN201810021546A CN108243130A CN 108243130 A CN108243130 A CN 108243130A CN 201810021546 A CN201810021546 A CN 201810021546A CN 108243130 A CN108243130 A CN 108243130A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
Abstract
The present invention relates to demodulation method, device, spectrum detector and computer readable storage mediums, belong to signal processing technology field.The demodulation method includes：Receive radio signal；Can modulation system be identified used by judging the radio signal based on presetting method；When to be, the corresponding demodulation mode of modulation system used by can judgement be found with the radio signal；When to be, the radio signal is demodulated based on the demodulation mode.It can carry out effectively identification to the signal of the unknown modulation system of the different frequency range received and search corresponding demodulation mode to go to demodulate by this method, read the useful information carried in the signal, and no longer it is that only known signal is demodulated, greatly solve under current complex electromagnetic environment, it is insufficient to monitoring/monitoring technology of radio the problem of.
Description
Technical field
The invention belongs to signal processing technology fields, and in particular to demodulation method, device, spectrum detector and computer can
Read storage medium.
Background technology
Modulation (modulation) is exactly to carry out processing to the signal source of information to be added on carrier wave, so that it becomes being suitable for letter
The process of the form of road transmission, exactly make the technology that carrier wave changes with signal source.In general, the information of signal source (is also referred to as
For information source) contain the relatively low frequency component of DC component and frequency, referred to as baseband signal.Baseband signal is tended not to as transmission
Signal, it is therefore necessary to baseband signal be changed into one with respect to the very high signal of frequency for baseband frequency to be suitable for channel
Transmission.This signal is called modulated signal, and baseband signal is called modulated signal.Modulation is by changing high frequency carrier i.e. message
Carrier signal amplitude, phase or frequency, make its variation with baseband signal amplitude and change to realize.And it demodulates
It is then to extract baseband signal from carrier wave so as to scheduled recipient (the also referred to as stay of two nights) processing and the process understood.
Current modulation and demodulation is modulated and is demodulated based on the agreement between sender and recipient mostly,
In other words, both sides subscribe the classification of modulation in advance, correspondingly it is also known that the mode of demodulation, sender press when sending signal
Signal is modulated according to advance agreement, after recipient receives the signal, just based on known demodulation mode to the signal
It is demodulated.
Invention content
In consideration of it, it the purpose of the present invention is to provide a kind of demodulation method, device, spectrum detector and computer-readable deposits
Storage media, to effectively improve under current complex electromagnetic environment, it is insufficient to monitoring/monitoring technology of radio the problem of.
What the embodiment of the present invention was realized in：
In a first aspect, an embodiment of the present invention provides a kind of demodulation method, including：Receive radio signal；Based on default
Can modulation system be identified used by method judges the radio signal；When to be, judgement can find with it is described
The corresponding demodulation mode of modulation system used by radio signal；When to be, based on the demodulation mode to described wireless
Electric signal is demodulated.
Second aspect, the embodiment of the present invention additionally provide a kind of demodulating equipment, including：Receiving module, it is wireless for receiving
Electric signal；First judgment module judges used by the radio signal that can modulation system by for being based on presetting method
Identification；Second judgment module, for judging the corresponding solution of modulation system used by can finding with the radio signal
Tune mode；Module is chosen, the radio signal is demodulated for being based on the demodulation mode.
The third aspect, the embodiment of the present invention additionally provide a kind of spectrum detector, including：Processor and memory, it is described
Processor is coupled with the memory；The memory is used to store program；The processor is stored in described deposit for calling
Program in reservoir performs the demodulation method.
Fourth aspect, the embodiment of the present invention additionally provides a kind of computer readable storage medium, described computer-readable
Storage medium is stored with program code that processor can perform in computer, and the computer read/write memory medium includes more
Item instructs, and a plurality of instruction is configured to that the processor is made to perform the demodulation method.
Demodulation method provided in an embodiment of the present invention, device, spectrum detector and computer readable storage medium, it is and existing
Technology is compared, and is greatly solved under current complex electromagnetic environment, it is insufficient to monitoring/monitoring technology of radio the problem of.Into
One step, in the monitoring radio-frequency spectrum and information countermeasure under the conditions of non-cooperative communication, non-cooperation recipient can not predict institute
Therefore modulation system used in the radio signal received, upon receiving the radio signals, is judged based on presetting method
Can the modulation system of the signal be identified, if so, judge that matched demodulation mode can be found, it should if so, selecting
Demodulation mode goes to demodulate, and to read the useful information carried in the signal, and is no longer that only known signal is demodulated.
Other features and advantages of the present invention will illustrate, also, partly become from specification in subsequent specification
It is clear that understood by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by being write
Specifically noted structure is realized and is obtained in specification, claims and attached drawing.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.By the way that shown in attached drawing, above and other purpose of the invention, feature and advantage will be more clear.In whole
Identical reference numeral indicates identical part in attached drawing.Deliberately attached drawing, emphasis are not drawn by actual size equal proportion scaling
It is purport of the invention is shown.
Fig. 1 shows a kind of structure diagram of spectrum detector provided in an embodiment of the present invention.
Fig. 2 shows a kind of method flow diagrams for demodulation method that first embodiment of the invention provides.
Fig. 3 shows the method flow diagram of the step S102 in Fig. 2 provided in an embodiment of the present invention.
Fig. 4 shows a kind of method flow diagram for demodulation method that second embodiment of the invention provides.
Fig. 5 shows a kind of module diagram for demodulating equipment that third embodiment of the invention provides.
Fig. 6 shows the module diagram of the second judgment module in Fig. 5 provided in an embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be configured to arrange and design with a variety of different.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiments obtained without creative efforts belong to the model that the present invention protects
It encloses.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need to that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " first ", " second ", " third " etc. are only used for distinguishing and retouch
It states, and it is not intended that instruction or hint relative importance.
As shown in Figure 1, Fig. 1 shows a kind of structure diagram of spectrum detector 100 provided in an embodiment of the present invention.It is described
Spectrum detector 100 includes：Demodulating equipment 110, memory 120, storage control 130 and processor 140.
The memory 120, storage control 130,140 each element of processor directly or indirectly electrically connect between each other
It connects, to realize the transmission of data or interaction.For example, these elements can pass through one or more communication bus or signal between each other
Line, which is realized, to be electrically connected.The demodulating equipment 110 can be stored including at least one in the form of software or firmware (firmware)
In the memory 120 or it is solidificated in the operating system (operating system, OS) of the spectrum detector 100
Software function module.The processor 140 is used to perform the executable module stored in memory 120, such as the demodulation dress
Put 110 software function modules or computer program included.
Wherein, memory 120 may be, but not limited to, random access memory (Random Access Memory,
RAM), read-only memory (Read Only Memory, ROM), programmable read only memory (Programmable Read-
Only Memory, PROM), erasable read-only memory (Erasable Programmable Read-Only Memory,
EPROM), electricallyerasable ROM (EEROM) (Electric Erasable Programmable Read-Only Memory,
EEPROM) etc..Wherein, memory 120 is for storing program, and the processor 140 is after execute instruction is received, described in execution
Program, method performed by the spectrum detector 100 for the flow definition that aftermentioned any embodiment of the embodiment of the present invention discloses can be with
It is realized applied in processor 140 or by processor 140.
Processor 140 may be a kind of IC chip, have the processing capacity of signal.Above-mentioned processor can be
General processor, including central processing unit (Central Processing Unit, CPU), network processing unit (Network
Processor, NP) etc.；It can also be digital signal processor (DSP), application-specific integrated circuit (ASIC), ready-made programmable gate array
Arrange (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components.It can realize
Or disclosed each method, step and logic diagram in the execution embodiment of the present invention.General processor can be microprocessor
Or the processor can also be any conventional processor etc..
First embodiment
Referring to Fig. 2, for a kind of demodulation method applied to above-mentioned spectrum detector 100 provided in an embodiment of the present invention,
Below in conjunction with Fig. 2 to its institute comprising the step of illustrate.
Step S101：Receive radio signal.
When the spectrum detector detects radio signal, the radio signal detected is received.
Step S102：Can modulation system be identified used by judging the radio signal based on presetting method.
After receiving radio signal, to further know content included in the signal, it is necessary first to receiving
To signal be demodulated, the letter being modulated due to the radio signal received not in accordance with the modulation system arranged in advance
Number, but unknown signaling.Can modulation system be identified used by therefore, it is necessary to judge the radio signal.Further,
The step is illustrated with method flow diagram shown in Fig. 3.
Step S201：The radio signal is pre-processed, obtains preprocessed signal.
Since current modulated signal according to form can be divided into modulated-analog signal and digital modulation signals, if this is wireless
Electric signal is digital modulation signals, then directly it can be sampled, obtain sampled signal, if the radio signal is simulation
Modulated signal then needs first to be AD converted, and obtains digital signal, then it is sampled, obtains sampled signal.On i.e.
The pretreatment stated is different according to the difference of signal being connected to, i.e. the pretreatment is AD conversion and/or sampling.
Step S202：The characteristic quantity of characterization modulation system is extracted based on the preprocessed signal.
To the preprocessed signal by AD conversion and/or sampling, characteristic quantity is extracted, wherein, this feature amount can be can
Any characteristic quantity of modulation system is characterized, such as：Characteristic of division based on cumulant, the characteristic of division based on spectral line, based on width
Spend characteristic of division of envelope flat degree etc..
Step S203：Judge that can the characteristic quantity be identified based on presetting method.
After the characteristic quantity for obtaining signal, a method is chosen from method database to the modulation system corresponding to this feature amount
It is identified, if this method cannot recognize that the corresponding modulation system of this feature amount, a method pair is chosen from remaining method
Modulation system corresponding to this feature amount is identified, until identifying modulation system or the general side corresponding to this feature amount
Until method in method database has all been chosen.Wherein, which can be radial basis function neural network (Radial
Basis Function Neural Network, RBFNN) or Signal Matching recognizer based on communications and liaison characteristic parameter.
Wherein, the Signal Matching recognizer based on communications and liaison characteristic parameter is to utilize detectable signal frequency index S, Chirp
Signal characteristic indices P, spectrum peak index T accurately and rapidly identify the modulation system of radio.Due to different modulating mode
Characteristic parameter under corresponding is different, therefore utilizes above three characteristic parameter, can quickly recognize and meet being somebody's turn to do for parameter specification
Class signal.
Wherein, when judging that can the characteristic quantity be identified based on presetting method, if can identify, step is performed
S103 terminates if it cannot identify.
Step S103：The corresponding demodulation side of modulation system used by can judgement be found with the radio signal
Formula.
When which kind of modulation system is the modulation system for identifying the radio signal belong to, for example, FSK, MFSK, PSK,
BPSK、QPSK、8PSK、DBPSK、DQPSK、8DPSK、16DPSK、MPSK、BPSM、QPSM、8PSM、QAM16、QAM32、QAM64
Deng.Can judgement be found and the corresponding demodulation mode of the modulation system.If corresponding demodulation mode cannot be found,
Terminate；If corresponding demodulation mode can be found, step S104 is performed.
Step S104：The radio signal is demodulated based on the demodulation mode.
In the corresponding demodulation mode of modulation system used by finding with the radio signal, just based on finding
Demodulation mode is demodulated the signal, obtains demodulated signal, to carry out subsequent processing.Further, since modulation is believed
Parallel burst mode transmission information number may be used, so after echo signal is recognized, need to carry out burst capture, it is accurate fixed
Position to the start-stop position of burst is believed using the burst detection algorithm based on spectrum entropy come the burst effectively realized under Low SNR
Number positioning.Wherein, the basic principle of the algorithm is：If observing number x (n) containing L sampling point, segment processing is carried out to it.It is if every
The N number of sampling points of Duan Hanyou, altogetherSection, whereinRepresent downward rounding.Observation data x (n) is write as matrix form, i.e.,
Then Short Time Fourier Transforms (Short-TimeFourierTransform, STFT) are carried out to observation data, i.e.,：
Wherein, k=0,1 ..., N-1 represent the frequency point of STFT.W (n) is the sliding window that length is N.H represents adjacent two window
The sampling point number at interval.Xk(m) form can be expressed as：
Wherein, | Xk(m) andAmplitude spectrum and phase spectrum are represented respectively.
It is right first from signal and the statistical property of noise amplitude spectrum | Xk(m)|2Define the normalizing of each frequency component
Change spectrum probability density function；
Wherein, pkIt is the corresponding probability density of certain frequency component k.Because burst is typically all sine wave modulation,
It has the harmonic structure of repetition on frequency spectrum, and noise does not have this feature then, therefore can use the entropy of frequency spectrum
(Entropy) it is detected.It is similar with Speech processing, the spectrum entropy of form is defined as follows to m segment signals：
Entropy H (m) is represented | Xk(m)2Information content, and entropy function have following property, i.e., when observation data x (n) be white
During noise, the probability of each frequency components of x (n) is equal, and uncertainty is maximum, and entropy is maximum value at this time；When observation data are
During burst, there is larger correlation, uncertainty is smaller, and entropy is also smaller at this time between sampling point.This explanation | Xk
(m)|2Probability distribution it is fuzzyyer, entropy is bigger.If the row vector that H is made of the spectrum entropy of each section of observation data, i.e. H=[H
(1), H (2) ..., H (M)], by H compared with preset thresholding, then think that burst starts to occur if less than the threshold value,
Think that signal terminates when composing entropy and being more than the thresholding.
Wherein, the detection performance that the selection of thresholding will directly influence algorithm.Compared with fixed threshold, adaptive threshold inspection
Method of determining and calculating can be according to the time-varying characteristics of signal, automatic adjusument threshold value.Decision threshold γ is defined as：
Wherein, N represents data window length, and α is the proportionality coefficient related with false-alarm probability, when constant false-alarm probability is
pFAWhen, have
It wherein, can be further using the synchronization header of burst, by synchronization using composing after entropy method carries out burst positioning
Head is related to observation data progress time domain, and the two is combined the burst effective position that can be realized under low signal-to-noise ratio.
Wherein, it is contemplated that influence (additive noise and multiplier interference) of the short wave channel fading characteristic to signal transmission, wherein,
Multiplier interference is non-linear including the frequency selective fading as caused by multipath effect and as caused by Doppler frequency difference effect between diameter
Time selective fading.Therefore more strategies may be used and combine the anti-fading non-blind receiving algorithm of partner come required when obtaining demodulation
Channel parameter.Wherein, which combines the anti-fading non-blind receiving algorithm of partner and includes：Based on signal envelope square spectrum
Symbol rate estimation, the carrier wave frequency deviation maximal possibility estimation based on unbound nucleus and the carrier wave initial phase based on unbound nucleus
Position estimation.
For the low signal-to-noise ratio short-wave signal under the blind condition of acceptance of non-partner, in carrier synchronization parameter (carrier frequency, load
Wave phase) estimation when, may be used the forward estimation algorithm of unbound nucleus, i.e., a certain standard be based on from the sample for receiving signal
Then (for example, maximum-likelihood criterion) direct estimation goes out parameter.It is first for signal capture and identification under the blind condition of acceptance of non-partner
The rough estimate of carrier wave frequency deviation is first carried out based on detectable signal, realizes the fast Acquisition of carrier wave, and evaluated error is limited in ±
Within 0.5Hz；Then down coversion and matched filtering processing are carried out；Again character rate, carrier frequency are carried out for each subcarriers
Partially, the fine estimation of carrier phase, to obtain per demodulating information bit stream all the way.
It is random in view of the influence to decline to shortwave burst, decline possibly is present at burst header, it is also possible to
Appear in burst middle part or tail portion.If at this point, estimate demodulation parameter (for example, utilizing burst header using single mode
Data are demodulated parameter Estimation), as a result it is likely to inaccurate.For this problem, take from burst different location
Hand is demodulated processing respectively, then result is carried out to the anti-fading non-blind receiving algorithm of partner of more strategy joints of amalgamation judging,
It is utilized respectively head, middle part, tail data the estimation demodulation parameter of burst, best demodulation is determined in conjunction with CRC check result
As a result.Further, for some burst of a certain subcarriers, which is divided into head, middle part, tail portion three parts
It accounts for, is demodulated parameter Estimation respectively, and pass through CRC check and determine whether the data frame is demodulated correctly, as long as having one
Class handling result CRC check OK, then it is assumed that frame data demodulation is correct, otherwise retains three classes handling result, in case multiple
The error-correcting decoding stage uses.Using this strategy, short wave channel fading characteristic can be effectively reduced to caused by the blind reception of signal
It influences.
1) symbol rate estimation based on signal envelope square spectrum：
Wherein, it is contemplated that the crystal oscillator of communicating pair can be there are certain error, so the signal code rate received will be
Theoretical value is nearby deviated.This is just needed before Symbol Timing is estimated, the estimation of character rate is carried out, using based on signal
The symbol rate estimation algorithm of envelope square spectrum.
To the observation data x (t) in white Gaussian noise w (t), i.e.,：
Wherein, anAnd bnRepresent the real and imaginary parts of information symbol, TbFor symbol period, fcFor carrier frequency.It carries out first
Hilbert converts to obtain analytic signalThen it calculatesSquared envelope signal z (t), i.e.,：
By suitably deriving, can obtain：
Wherein,And the Fourier transformation of u (t) can be expressed as
Therefore the discrete spectral line corresponding to character rate can be detected from the Fourier transform amplitude spectrum of z (t).
2) maximal possibility estimation based on unbound nucleus：
Wherein, for through overdeviation rough estimate, down coversion, matched filtering treated quasi- baseband signal, using based on non-
Data-aided maximum- likelihood estimation carries out carrier wave frequency deviation and finely estimates.
Assuming that the reception data for having obtained accurate sign synchronization are：
Wherein, akBe the general DQPSK data of independent identically distributed grade (assuming that the signal be using the 16 of DQPSK modulation systems
Sound signal), T is symbol period, feIt is unknown carrier wave frequency deviation, θ0It is unknown carrier phase, nkIt is that real part and imaginary part statistics are only
Vertical white complex gaussian noise, variance σ2.By suitably deriving, it is known that xkLog-likelihood function be：
Wherein, N represents data symbol length, and has：
Wherein,It represents to function Y (ak...) and in akTake mean value.Formula (2) is substituted into formula (1), and omit
Outlier can obtain：
For 2 π/M rotational symmetry constellations, can be further simplified as：
So as to which the maximal possibility estimation for obtaining carrier wave frequency deviation is：
Then enable：
To above formula derivation, only to the necessary condition that derivative is 0, i.e. imaginary part is analyzed for 0, i.e.,：
Wherein, auto-correlation function R (k) is defined as：
And haveAs can be seen that auto-correlation function R (k) contains all information of carrier wave frequency deviation, then use
Classical M＆M algorithms estimate frequency deviation, i.e.,：
Wherein, weight w (k) is：
3) the carrier wave initial phase estimation based on unbound nucleus：
Wherein, if time burst is shorter, in a time burst it is sufficient that phase estimation of progress, but if
Time burst is longer, it is further assumed that and it is just less reasonable without frequency deviation in a time burst, if needing entire burst being divided at this time
Dry period, assume in each section without frequency deviation, and skew estimation is carried out for every one piece of data.This processing method can generate
Phase hit between section and section, that is, the phase ambiguity between section and section.
For this problem, first have to obtain carrier phase estimated value based on V＆V algorithms.The realization process of V＆V algorithms can
To be summarised as：It is non-linear go one ＞ real and imaginary parts signal of modulating transformation sum respectively a ＞ calculate phase.If the section happens suddenly
It is shorter, it is considered as the carrier phase estimated result that this value is this section burst；If section burst is longer, then will judge
Phase hit whether is had, and further eliminates phase hit.
If the phase estimation value of the i-th segment data of V＆V algorithms output isIts value range represents DQPSK in ± π/M, M
The order of modulation of signal, and actual phase isIn one.Assuming that in a burst
The actual phase of (i-1)-th segment signal is：
So, the actual phase of the i-th segment signal：
Centainly it is closest toThat phase value, i.e.,：
Using this method, the probability of Phase Continuation saltus step can be effectively reduced, improves the noise robustness of algorithm.
Second embodiment
As a kind of embodiment, Fig. 4 is please referred to, is present embodiments provided a kind of applied to above-mentioned spectrum detector 100
Demodulation method, below in conjunction with Fig. 4 to its institute comprising the step of illustrate.
Step S301：Receive radio signal.
The step is identical with step S101, illustrates and please refers to step S101.
Step S302：Can modulation system be identified used by judging the radio signal based on presetting method.
The step is identical with step S102, illustrates and please refers to step S102, wherein, it cannot identify the aerogram
Used by number during modulation system, then step S305 is performed.
Step S303：The corresponding demodulation side of modulation system used by can judgement be found with the radio signal
Formula.
The step is identical with step S103, illustrates and please refers to step S103.
Step S304：The radio signal is demodulated based on the demodulation mode.
The step is identical with step S104, illustrates and please refers to step S104.
Step S305：It is recorded to the radio signal or Sampling hold.
When can not to the radio signal used by modulation system be identified when, just to the radio signal carry out
Recording or Sampling hold, as follow-up signal Modulation analysis material, so that the identification method for subsequently developing new knows this
Not.
3rd embodiment
The embodiment of the present invention additionally provides a kind of demodulating equipment, as shown in Figure 5.The demodulating equipment 110 includes：Receiving module
111st, the first judgment module 112, the second judgment module 113, selection module 114 and preserving module 115.
The receiving module 111, for receiving radio signal.
First judgment module 112 judges modulation system energy used by the radio signal for being based on presetting method
It is no identified.Further, as shown in fig. 6, first judgment module 112 further includes：Pre-process submodule 1121, feature extraction
Submodule 1122, judging submodule 1123.
Wherein, submodule 1121 is pre-processed, for being pre-processed to the radio signal, obtains preprocessed signal.
Feature extraction submodule 1122, for extracting the characteristic quantity of characterization modulation system based on the preprocessed signal.
Judging submodule 1123 judges that can the characteristic quantity be identified for being based on presetting method.
Second judgment module 113, for judging that can used by finding with the radio signal modulation system be opposite
The demodulation mode answered.
Module 114 is chosen, the radio signal is demodulated for being based on the demodulation mode.
Preserving module 115, for being recorded to the radio signal or Sampling hold.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference from other examples, and just to refer each other for identical similar part between each embodiment.
The technique effect and preceding method of the demodulating equipment 110 that the embodiment of the present invention is provided, realization principle and generation
Embodiment is identical, and to briefly describe, device embodiment part does not refer to part, can refer in corresponding in preceding method embodiment
Hold.
In several embodiments provided herein, it should be understood that disclosed device and method can also pass through
Other modes are realized.The apparatus embodiments described above are merely exemplary, for example, flow chart and block diagram in attached drawing
Show the device of multiple embodiments according to the present invention, the architectural framework in the cards of method and computer program product,
Function and operation.In this regard, each box in flow chart or block diagram can represent the one of a module, program segment or code
Part, a part for the module, program segment or code include one or more and are used to implement holding for defined logic function
Row instruction.It should also be noted that at some as in the realization method replaced, the function that is marked in box can also be to be different from
The sequence marked in attached drawing occurs.For example, two continuous boxes can essentially perform substantially in parallel, they are sometimes
It can perform in the opposite order, this is depended on the functions involved.It is it is also noted that every in block diagram and/or flow chart
The combination of a box and the box in block diagram and/or flow chart can use function or the dedicated base of action as defined in performing
It realizes or can be realized with the combination of specialized hardware and computer instruction in the system of hardware.
In addition, each function module in each embodiment of the present invention can integrate to form an independent portion
Point or modules individualism, can also two or more modules be integrated to form an independent part.
If the function is realized in the form of software function module and is independent product sale or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme of the present invention is substantially in other words
The part contribute to the prior art or the part of the technical solution can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, is used including some instructions so that a computer equipment (can be
People's computer, laptop, server or network equipment etc.) perform the whole of each embodiment the method for the present invention
Or part steps.And aforementioned storage medium includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.It should be noted that herein, relational terms such as first and second and the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or set
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
Also there are other identical elements in the process, method, article or apparatus that includes the element.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of demodulation method, which is characterized in that including：
Receive radio signal；
Can modulation system be identified used by judging the radio signal based on presetting method；
When to be, the corresponding demodulation mode of modulation system used by can judgement be found with the radio signal；
When to be, the radio signal is demodulated based on the demodulation mode.
2. according to the method described in claim 1, it is characterized in that, judge that the radio signal is used based on presetting method
Modulation system can be identified, including：
The radio signal is pre-processed, obtains preprocessed signal；
The characteristic quantity of characterization modulation system is extracted based on the preprocessed signal；
Judge that can the characteristic quantity be identified based on presetting method.
3. according to the method described in claim 2, it is characterized in that, judge that can the characteristic quantity be known based on presetting method
Not, including：
Signal Matching recognizer based on radial basis function neural network or based on communications and liaison characteristic parameter judges the characteristic quantity
It can be identified.
4. according to the method described in claim 1, it is characterized in that, can not to the radio signal used by modulation system
When being identified, the method further includes：
It is recorded to the radio signal or Sampling hold.
5. a kind of demodulating equipment, which is characterized in that including：
Receiving module, for receiving radio signal；
Can the first judgment module be known for being based on modulation system used by presetting method judges the radio signal
Not；
Second judgment module, for judging the corresponding demodulation of modulation system used by can finding with the radio signal
Mode；
Module is chosen, the radio signal is demodulated for being based on the demodulation mode.
6. demodulating equipment according to claim 5, which is characterized in that first judgment module includes：
Submodule is pre-processed, for being pre-processed to the radio signal, obtains preprocessed signal；
Characteristic extracting module, for extracting the characteristic quantity of characterization modulation system based on the preprocessed signal；
Judging submodule judges that can the characteristic quantity be identified for being based on presetting method.
7. demodulating equipment according to claim 6, which is characterized in that the judging submodule is additionally operable to based on radial direction base letter
Number neural network or the Signal Matching recognizer based on communications and liaison characteristic parameter judge that can the characteristic quantity be identified.
8. demodulating equipment according to claim 5, which is characterized in that the demodulating equipment further includes：Preserving module is used for
It is recorded to the radio signal or Sampling hold.
9. a kind of spectrum detector, which is characterized in that including：Processor and memory, the processor and the memory coupling
It closes；
The memory is used to store program；
The processor is performed for calling the program being stored in the memory described in any one of claim 1-4
Demodulation method.
10. a kind of computer readable storage medium, which is characterized in that the computer read/write memory medium is stored with processor
For executable program code in computer, the computer read/write memory medium includes a plurality of instruction, a plurality of instruction
It is configured to that the processor is made to perform any one of the claim 1-4 demodulation methods.
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