CN106803834A - A kind of direct sequence spread spectrum train-ground communication control system based on internet - Google Patents
A kind of direct sequence spread spectrum train-ground communication control system based on internet Download PDFInfo
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- CN106803834A CN106803834A CN201611031171.6A CN201611031171A CN106803834A CN 106803834 A CN106803834 A CN 106803834A CN 201611031171 A CN201611031171 A CN 201611031171A CN 106803834 A CN106803834 A CN 106803834A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/04—Protocols specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
Abstract
The invention discloses a kind of direct sequence spread spectrum train-ground communication control system based on internet, including trackside console controller and on-vehicle host controller, the input of the output end of trackside console controller respectively with memory, sound-optical controller and shielding door controller is electrically connected with；Trackside console controller is electrically connected with the first radio frequency transceiving module and trackside radio station respectively；First radio frequency transceiving module is connected by GPRS network with external equipment；On-vehicle host controller is electrically connected with vehicular station, RAM memory, mram memory, database and the second radio frequency transceiving module respectively；Second radio frequency transceiving module is connected by GPRS network with external equipment；First radio frequency transceiving module by GPRS network with and the second radio frequency transceiving module, the beneficial effect of the invention be add Internet technology, using the efficient data transfer and the superiority of data processing of internet.
Description
Technical field
The invention belongs to urban rail-transport vehicle-ground communication field, more particularly to a kind of direct sequence spread spectrum car based on internet
Ground communication control system.
Background technology
With the development of the communication technology and information technology, it is wide that computer carries out data traffic exchange by wireless channel
It is general to be applied to the various fields such as industry, business, traffic, military affairs.The widely used spread spectrum communication of current wireless network communication system
2.4~2.4835GHz frequency ranges are opened industry, science and the doctor freely to use by technology, domestic Wireless Management Committee
Treatment field ISM band.In field of urban rail, wireless communication technology also disappears including signal of communication, dispatch control, public security
It is applied in the different system such as anti-, mobile communication and passenger information issue.Moment keep subway train and ground installation it
Between high speed data exchange have become ensure subway passenger-traffic system high-efficiency operation basis and premise.
With the fast development of internet, single 2.4G direct sequence spread spectrums technical communication can not meet demand how
It is the task of top priority that internet is combined with 2.4G direct sequence spread spectrum technical communications.
The content of the invention
The efficient data that the present invention provides a kind of utilization internet to solve technical problem present in known technology is passed
A kind of direct sequence spread spectrum train-ground communication control system based on internet of the superiority of defeated and data processing.
The present invention is adopted the technical scheme that to solve technical problem present in known technology：One kind is based on internet
Direct sequence spread spectrum train-ground communication control system, including trackside console controller and on-vehicle host controller, the trackside main frame control
Input of the output end of device processed respectively with memory, sound-optical controller and shielding door controller is electrically connected with；The trackside master
Machine controller is electrically connected with the first radio frequency transceiving module and trackside radio station respectively；First radio transceiver
Module is connected by GPRS network with external equipment；The trackside radio station passes through 2.4G spread spectrum communications unit and onboard wireless
Radio station connects；The on-vehicle host controller respectively with vehicular station, RAM memory, mram memory, database and
Two radio frequency transceiving modules are electrically connected with；Second radio frequency transceiving module is connected by GPRS network with external equipment
Connect；First radio frequency transceiving module is by GPRS network and and the second radio frequency transceiving module.
Further, the output end of the input of the trackside console controller and the first power supply module is electrically connected with.
Further, the output end of the sound-optical controller respectively with warning lamp, the first loudspeaker, illuminating lamp and buzzer
Input is electrically connected with.
Further, the output end of the shielding door controller is electrical with the input of shielding gate driver by door control unit
Connection.
Further, the output end of the input of the on-vehicle host controller and the second power supply module is electrically connected with.
Further, the output end of the on-vehicle host controller respectively with LED display and the input of the second loudspeaker
It is electrically connected with.
Further, the on-vehicle host controller is provided with synchronized orthogonal Frequency Hopping Signal blind source separating module, the synchronization
The synchronized orthogonal Frequency Hopping Signal blind source separation method of quadrature frequency hopping signal blind source separating module is comprised the following steps：
Step one, is believed using the frequency hopping from multiple synchronized orthogonal frequency hopping radio sets containing the M array antenna received of array element
Number, to being sampled per reception signal all the way, the M roads discrete time-domain mixed signal after being sampledM=
1,2,…,M；
Step 2, carries out overlapping adding window Short Time Fourier Transform to M roads discrete time-domain mixed signal, obtains M mixing letter
Number time-frequency domain matrix
P=0,1 ..., P-1, q=0,1 ..., Nfft- 1, wherein P represents total
Window number, NfftRepresent FFT length；(p, q) represents time-frequency index, and specific time-frequency value isHere
NfftThe length of FFT is represented, p represents adding window number of times, TsRepresent sampling interval, fsSample frequency is represented, C is integer, represented
The sampling number at Short Time Fourier Transform adding window interval, C<Nfft, and Kc=Nfft/ C is integer, that is to say, that use overlap
The Short Time Fourier Transform of adding window；
Step 3, to the frequency-hopping mixing signal time-frequency domain matrix obtained in step 2
Pre-processed；It is rightLow energy is carried out to pre-process, i.e., in each sampling instant p, willValue of the amplitude less than thresholding ε sets to 0, and obtains
The setting of thresholding ε can determine according to the average energy for receiving signal；Find out the time-frequency of p moment (p=0,1,2 ... P-1) non-zero
Numeric field data, usesRepresent, whereinRepresent the response of p moment time-frequencyThese non-zeros are normalized and pre-processed by corresponding frequency indices when non-zero, are obtained
Pretreated vectorial b (p, q)=[b1(p,q),b2(p,q),…,bM(p,q)]T, wherein
Step 4, estimates the jumping moment of each jump and respectively jumps corresponding normalized hybrid matrix using clustering algorithm
Column vector, Hopping frequencies；
Step 5, estimates that the normalization hybrid matrix column vector for obtaining estimates time-frequency domain frequency hopping source signal according to step 4；
Which moment index belongs to and jump is judged to all sampling instants index p, specific method is：IfThen represent that moment p belongs to l jumps；IfThen represent that moment p belongs to the 1st
Jump；The all moment p jumped to l (l=1,2 ...)l, estimate the time-frequency numeric field data of each frequency hopping source signal of the jump, computing formula is such as
Under：
Step 6, splices to the time-frequency domain frequency hopping source signal between different frequency hopping points；Estimate that l is jumped correspondingIt is individual
Incident angle, usesThe corresponding incident angle of l n-th source signal of jump is represented,Computing formula it is as follows：
Represent that l jumps n-th hybrid matrix column vector for estimating to obtainM-th element, c represents the light velocity,
That is vc=3 × 108Meter per second；Judge that l (l=2,3 ...) is jumped right between the source signal of estimation and the source signal of the first jump estimation
Should be related to, judgment formula is as follows：
Wherein mn (l)Represent that l jumps the m for estimatingn (l)Individual signal and first n-th signal for jumping estimation belong to same source
Signal；By different frequency hopping point estimation to the signal for belonging to same source signal be stitched together, as final time-frequency domain source
Signal estimation, uses YnTime-frequency domain estimate of n-th source signal of (p, q) expression in time frequency point (p, q), p=0,1,2 ...,
P, q=0,1,2 ..., Nfft- 1, i.e.,
Step 7, according to source signal time-frequency domain estimate, recovers time domain frequency hopping source signal；To each sampling instant p (p=
0,1,2 ...) frequency domain data Yn(p, q), q=0,1,2 ..., Nfft- 1 is NfftThe IFFT conversion of point, obtains p sampling instants pair
The time domain frequency hopping source signal answered, uses yn(p,qt)(qt=0,1,2 ..., Nfft- 1) represent；The time domain that above-mentioned all moment are obtained
Frequency hopping source signal yn(p,qt) treatment is merged, obtain final time domain frequency hopping source signal and estimate, specific formula is as follows：
Here Kc=Nfft/ C, C are the sampling number at Short Time Fourier Transform adding window interval, NfftIt is the length of FFT.
Further, first radio frequency transceiving module is provided with signal detection module, the signal detection module
Signal detecting method is comprised the following steps：
The first step, signal x1 is obtained using frequency mixer by radio frequency or intermediate-freuqncy signal with single-frequency mixing；
Second step, using the high fdrequency component of low pass filter A removal signals x1, the three dB bandwidth of low pass filter A is more than divides
Analysis bandwidth B s, obtains signal x2, and now x2 is the signal of zero intermediate frequency, and the signal with a width of Bs is influenceed by wave filter A
Very little, it is negligible；
3rd step, two step treatment are carried out by signal x2 simultaneously：First by x2 by low pass filter B, passband is 0--PBs,
P<1, the low-frequency time-domain signal x2L of signal is obtained with a width of PBs；Again by x2 by high-pass filter, passband is PBs-Bs,
The high frequency time-domain signal x2H of signal is obtained with a width of (1-P) Bs；
4th step, is added up, i.e. the quadratic sum of the mould of time-domain signal using time domain, obtains the energy value EL of signal x2L, and
The energy value EH of signal x2H；
5th step, tries to achieve ratio R=EL/EH；
6th step, thresholding is demarcated, and R values is repeatedly sought to the data for having signal and no signal first, by statistical probability
Obtain thresholding C1 and C2, C2>The size of C1, C2 value mainly influences the size of false dismissal probability, C1 mainly to influence false alarm probability, selected
The thresholding selected should ensure that the unfavorable factor of both the above is possible small；
7th step, the renewal of flag bit flag, flag=0 represents that a preceding testing result is no signal, this kind of condition
Under, only work as R>It is judged to currently detected signal during C2, flag is changed into 1；Work as flag=1, represent that a preceding testing result is
Have a signal, it is this kind of under the conditions of, only work as R<It is judged to currently be not detected by signal during C1, flag is changed into 0；
8th step, controls whether subsequent demodulation thread etc. is opened according to flag bit：Flag=1, opens subsequent demodulation thread
Deng, otherwise close subsequent demodulation thread.
The present invention has the advantages and positive effects that：This is based on the direct sequence spread spectrum train-ground communication control system of internet,
Add Internet technology on the basis of 2.4G direct sequence spectrum spread communication technologies, fully using the efficient data transfer in internet with
The superiority of data processing, service truck ground high speed, anti-interference, real time bidirectional data exchange and transmission command signal, external equipment leads to
Crossing GPRS network can improve the convenience of operation, equipment to trackside console controller and on-vehicle host controller remote control
It is simple to operate, it is easy to use.
Brief description of the drawings
Fig. 1 is that the direct sequence spread spectrum train-ground communication Control system architecture based on internet provided in an embodiment of the present invention is illustrated
Figure.
In figure：1st, trackside console controller；2nd, the first power supply module；3rd, memory；4th, sound-optical controller；5th, shielding gate
Device processed；6th, warning lamp；7th, the first loudspeaker；8th, illuminating lamp；9th, buzzer；10th, door control unit；11st, gate driver is shielded；12、
First radio frequency transceiving module；13rd, trackside radio station；14th, GPRS network；15th, external equipment；16th, 2.4G spread spectrum communications
Unit；17th, vehicular station；18th, on-vehicle host controller；19th, RAM memory；20th, mram memory；21st, database；
22nd, the second radio frequency transceiving module；23rd, the second power supply module；24th, LED display；25th, the second loudspeaker.
Specific embodiment
For the content of the invention of the invention, feature and effect can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing
Describe in detail as follows.
Structure of the invention is explained in detail with reference to Fig. 1：
Direct sequence spread spectrum train-ground communication control system based on internet provided in an embodiment of the present invention, including trackside main frame control
Device processed 1 and on-vehicle host controller 18, the output end of the trackside console controller 1 respectively with memory 3, sound-optical controller 4
Input with shielding door controller 5 is electrically connected with；The trackside console controller 1 respectively with the first radio frequency transceiving module
12 and trackside radio station 13 be electrically connected with；First radio frequency transceiving module 12 passes through GPRS network 14 and external equipment
15 connections；The trackside radio station 13 is connected by 2.4G spread spectrum communications unit 16 with vehicular station 17；It is described vehicle-mounted
Console controller 18 is respectively with vehicular station 17, RAM memory 19, mram memory 20, database 21 and second is wireless
RF receiving and transmission module 22 is electrically connected with；Second radio frequency transceiving module 22 is connected by GPRS network 14 with external equipment 15
Connect；First radio frequency transceiving module 12 is by GPRS network 14 and and the second radio frequency transceiving module 22.
Further, the output end of the input of the trackside console controller 1 and the first power supply module 2 is electrically connected with.
Further, the output end of the sound-optical controller 4 respectively with warning lamp 6, the first loudspeaker 7, illuminating lamp 8 and buzzing
The input of device 9 is electrically connected with.
Further, the output end of the shielding door controller 5 is by door control unit 10 and the input for shielding gate driver 11
End is electrically connected with.
Further, the output end of the input of the on-vehicle host controller 18 and the second power supply module 23 is electrically connected with.
Further, the output end of the on-vehicle host controller 18 respectively with the loudspeaker 25 of LED display 24 and second
Input is electrically connected with.
Further, the on-vehicle host controller is provided with synchronized orthogonal Frequency Hopping Signal blind source separating module, the synchronization
The synchronized orthogonal Frequency Hopping Signal blind source separation method of quadrature frequency hopping signal blind source separating module is comprised the following steps：
Step one, is believed using the frequency hopping from multiple synchronized orthogonal frequency hopping radio sets containing the M array antenna received of array element
Number, to being sampled per reception signal all the way, the M roads discrete time-domain mixed signal after being sampledM=
1,2,…,M；
Step 2, carries out overlapping adding window Short Time Fourier Transform to M roads discrete time-domain mixed signal, obtains M mixing letter
Number time-frequency domain matrix
P=0,1 ..., P-1, q=0,1 ..., Nfft- 1, wherein P represents total
Window number, NfftRepresent FFT length；(p, q) represents time-frequency index, and specific time-frequency value isHere
NfftThe length of FFT is represented, p represents adding window number of times, TsRepresent sampling interval, fsSample frequency is represented, C is integer, represented
The sampling number at Short Time Fourier Transform adding window interval, C<Nfft, and Kc=Nfft/ C is integer, that is to say, that use overlap
The Short Time Fourier Transform of adding window；
Step 3, to the frequency-hopping mixing signal time-frequency domain matrix obtained in step 2
Pre-processed；It is rightLow energy is carried out to pre-process, i.e., in each sampling instant p, willValue of the amplitude less than thresholding ε sets to 0, and obtains
The setting of thresholding ε can determine according to the average energy for receiving signal；Find out the time-frequency of p moment (p=0,1,2 ... P-1) non-zero
Numeric field data, usesRepresent, whereinRepresent the response of p moment time-frequencyThese non-zeros are normalized and pre-processed by corresponding frequency indices when non-zero, are obtained
Pretreated vectorial b (p, q)=[b1(p,q),b2(p,q),…,bM(p,q)]T, wherein
Step 4, estimates the jumping moment of each jump and respectively jumps corresponding normalized hybrid matrix using clustering algorithm
Column vector, Hopping frequencies；
Step 5, estimates that the normalization hybrid matrix column vector for obtaining estimates time-frequency domain frequency hopping source signal according to step 4；
Which moment index belongs to and jump is judged to all sampling instants index p, specific method is：Ifl
>=2, then it represents that moment p belongs to l jumps；IfThen represent that moment p belongs to the 1st jump；To l (l=1,2 ...)
The all moment p for jumpingl, estimate the time-frequency numeric field data of each frequency hopping source signal of the jump, computing formula is as follows：
Step 6, splices to the time-frequency domain frequency hopping source signal between different frequency hopping points；Estimate that l is jumped correspondingIt is individual
Incident angle, usesThe corresponding incident angle of l n-th source signal of jump is represented,Computing formula it is as follows：
Represent that l jumps n-th hybrid matrix column vector for estimating to obtainM-th element, c represents the light velocity,
That is vc=3 × 108Meter per second；Judge that l (l=2,3 ...) is jumped right between the source signal of estimation and the source signal of the first jump estimation
Should be related to, judgment formula is as follows：
Wherein mn (l)Represent that l jumps the m for estimatingn (l)Individual signal and first n-th signal for jumping estimation belong to same source
Signal；By different frequency hopping point estimation to the signal for belonging to same source signal be stitched together, as final time-frequency domain source
Signal estimation, uses YnTime-frequency domain estimate of n-th source signal of (p, q) expression in time frequency point (p, q), p=0,1,2 ...,
P, q=0,1,2 ..., Nfft- 1, i.e.,
Step 7, according to source signal time-frequency domain estimate, recovers time domain frequency hopping source signal；To each sampling instant p (p=
0,1,2 ...) frequency domain data Yn(p, q), q=0,1,2 ..., Nfft- 1 is NfftThe IFFT conversion of point, obtains p sampling instants pair
The time domain frequency hopping source signal answered, uses yn(p,qt)(qt=0,1,2 ..., Nfft- 1) represent；The time domain that above-mentioned all moment are obtained
Frequency hopping source signal yn(p,qt) treatment is merged, obtain final time domain frequency hopping source signal and estimate, specific formula is as follows：
Here Kc=Nfft/ C, C are the sampling number at Short Time Fourier Transform adding window interval, NfftIt is the length of FFT.
Further, first radio frequency transceiving module is provided with signal detection module, the signal detection module
Signal detecting method is comprised the following steps：
The first step, signal x1 is obtained using frequency mixer by radio frequency or intermediate-freuqncy signal with single-frequency mixing；
Second step, using the high fdrequency component of low pass filter A removal signals x1, the three dB bandwidth of low pass filter A is more than divides
Analysis bandwidth B s, obtains signal x2, and now x2 is the signal of zero intermediate frequency, and the signal with a width of Bs is influenceed by wave filter A
Very little, it is negligible；
3rd step, two step treatment are carried out by signal x2 simultaneously：First by x2 by low pass filter B, passband is 0--PBs,
P<1, the low-frequency time-domain signal x2L of signal is obtained with a width of PBs；Again by x2 by high-pass filter, passband is PBs-Bs,
The high frequency time-domain signal x2H of signal is obtained with a width of (1-P) Bs；
4th step, is added up, i.e. the quadratic sum of the mould of time-domain signal using time domain, obtains the energy value EL of signal x2L, and
The energy value EH of signal x2H；
5th step, tries to achieve ratio R=EL/EH；
6th step, thresholding is demarcated, and R values is repeatedly sought to the data for having signal and no signal first, by statistical probability
Obtain thresholding C1 and C2, C2>The size of C1, C2 value mainly influences the size of false dismissal probability, C1 mainly to influence false alarm probability, selected
The thresholding selected should ensure that the unfavorable factor of both the above is possible small；
7th step, the renewal of flag bit flag, flag=0 represents that a preceding testing result is no signal, this kind of condition
Under, only work as R>It is judged to currently detected signal during C2, flag is changed into 1；Work as flag=1, represent that a preceding testing result is
Have a signal, it is this kind of under the conditions of, only work as R<It is judged to currently be not detected by signal during C1, flag is changed into 0；
8th step, controls whether subsequent demodulation thread etc. is opened according to flag bit：Flag=1, opens subsequent demodulation thread
Deng, otherwise close subsequent demodulation thread.
Operation principle：This is based on the direct sequence spread spectrum train-ground communication control system of internet, one side trackside console controller 1
Carried out by trackside radio station 13,2.4G spread spectrum communications unit 16 and vehicular station 17 with on-vehicle host controller 18 double
To data exchange, on-vehicle host controller 18 passes through vehicular station 17,2.4G spread spectrum communications unit 16 and trackside radio
Platform 13 sends operational order to trackside console controller 1, and another aspect trackside console controller 1 and on-vehicle host controller 18 are logical
Cross the first radio frequency transceiving module 12, GPRS network 14 and carry out bi-directional data with the second radio frequency transceiving module 22 and exchange,
On-vehicle host controller 18 passes through the second radio frequency transceiving module 22, the radio frequency transceiving module 12 of GPRS network 14 and first
Operational order is sent to trackside console controller 1, external equipment 15 passes through the radio frequency transceiving module of GPRS network 14 and first
12 pairs of trackside console controllers 1 carry out remote control, and external equipment 15 passes through the radio transceiver mould of GPRS network 14 and second
Block 22 carries out remote control to on-vehicle host controller 18, and internet skill is added on the basis of 2.4G direct sequence spectrum spread communication technologies
Art, fully using the efficient data transfer in internet and the superiority of data processing, improves the convenience of operation, and first supplies
Electric module 2 is that trackside console controller 1 provides power supply, and the second power supply module 23 is that on-vehicle host controller 18 provides power supply, the
One radio frequency transceiving module 12 and the second radio frequency transceiving module 22 are used to receive and send wireless network signal.
The above is only the preferred embodiments of the present invention, and any formal limitation is not made to the present invention,
It is every according to technical spirit of the invention to any simple modification made for any of the above embodiments, equivalent variations and modification are belonged to
In the range of technical solution of the present invention.
Claims (3)
1. a kind of direct sequence spread spectrum train-ground communication control system based on internet, including trackside console controller and on-vehicle host control
Device processed, it is characterised in that the output end of the trackside console controller respectively with memory, sound-optical controller and shielding gate control
The input of device is electrically connected with；The trackside console controller respectively with the first radio frequency transceiving module and trackside radio station
It is electrically connected with；First radio frequency transceiving module is connected by GPRS network with external equipment；The trackside radio station
It is connected with vehicular station by 2.4G spread spectrum communication units；The on-vehicle host controller respectively with vehicular station,
RAM memory, mram memory, database and the second radio frequency transceiving module are electrically connected with；Second less radio-frequency is received
Hair module is connected by GPRS network with external equipment；First radio frequency transceiving module is by GPRS network and and second
Radio frequency transceiving module；
The input of the trackside console controller and the output end of the first power supply module are electrically connected with；
Input of the output end of the sound-optical controller respectively with warning lamp, the first loudspeaker, illuminating lamp and buzzer is electrical
Connection；
The output end of the shielding door controller is electrically connected with by door control unit with the input of shielding gate driver；
The input of the on-vehicle host controller and the output end of the second power supply module are electrically connected with；
The output end of the on-vehicle host controller is electrically connected with the input of LED display and the second loudspeaker respectively.
2. the direct sequence spread spectrum train-ground communication control system of internet is based on as claimed in claim 1, it is characterised in that the car
Carry console controller and be provided with synchronized orthogonal Frequency Hopping Signal blind source separating module, the synchronized orthogonal Frequency Hopping Signal blind source separating mould
The synchronized orthogonal Frequency Hopping Signal blind source separation method of block is comprised the following steps：
Step one is right using containing Frequency Hopping Signal of the M array antenna received of array element from multiple synchronized orthogonal frequency hopping radio sets
Sampled per signal is received all the way, the M roads discrete time-domain mixed signal after being sampled
Step 2, carries out overlapping adding window Short Time Fourier Transform to M roads discrete time-domain mixed signal, obtains M mixed signal
Time-frequency domain matrixWherein P represents total
Window number, NfftRepresent FFT length；(p, q) represents time-frequency index, and specific time-frequency value isHere
NfftThe length of FFT is represented, p represents adding window number of times, TsRepresent sampling interval, fsSample frequency is represented, C is integer, represented
The sampling number at Short Time Fourier Transform adding window interval, C<Nfft, and Kc=Nfft/ C is integer, that is to say, that use overlap
The Short Time Fourier Transform of adding window；
Step 3, to the frequency-hopping mixing signal time-frequency domain matrix obtained in step 2Carry out
Pretreatment；It is rightLow energy is carried out to pre-process, i.e., in each sampling instant p, willValue of the amplitude less than thresholding ε sets to 0, and obtains
The setting of thresholding ε can determine according to the average energy for receiving signal；Find out the time-frequency of p moment (p=0,1,2 ... P-1) non-zero
Numeric field data, usesRepresent, whereinRepresent the response of p moment time-frequencyThese non-zeros are normalized and pre-processed by corresponding frequency indices when non-zero, are obtained
Pretreated vectorial b (p, q)=[b1(p,q),b2(p,q),…,bM(p,q)]T, wherein
Step 4, using clustering algorithm estimate each jump jumping moment and respectively jump corresponding normalized mixed moment array to
Amount, Hopping frequencies；
Step 5, estimates that the normalization hybrid matrix column vector for obtaining estimates time-frequency domain frequency hopping source signal according to step 4；To institute
There is sampling instant to index p and judge which moment index belongs to and jump, specific method is：If
Then represent that moment p belongs to l jumps；IfThen represent that moment p belongs to the 1st jump；L (l=1,2 ...) is jumped
All moment pl, estimate the time-frequency numeric field data of each frequency hopping source signal of the jump, computing formula is as follows：
Step 6, splices to the time-frequency domain frequency hopping source signal between different frequency hopping points；Estimate that l is jumped correspondingIndividual incidence
Angle, usesThe corresponding incident angle of l n-th source signal of jump is represented,Computing formula it is as follows：
Represent that l jumps n-th hybrid matrix column vector for estimating to obtainM-th element, c represents the light velocity, i.e. vc
=3 × 108Meter per second；Judge that l (l=2,3 ...) is jumped corresponding between the source signal of estimation and the source signal of the first jump estimation
Relation, judgment formula is as follows：
Wherein mn (l)Represent that l jumps the m for estimatingn (l)Individual signal and first n-th signal for jumping estimation belong to same source letter
Number；By different frequency hopping point estimation to the signal for belonging to same source signal be stitched together, believe as final time-frequency domain source
Number estimate, use YnTime-frequency domain estimate of n-th source signal of (p, q) expression in time frequency point (p, q), p=0,1,2 ..., P,
Q=0,1,2 ..., Nfft- 1, i.e.,
Step 7, according to source signal time-frequency domain estimate, recovers time domain frequency hopping source signal；To each sampling instant p (p=0,1,
2 ...) frequency domain data Yn(p, q), q=0,1,2 ..., Nfft- 1 is NfftThe IFFT conversion of point, obtains p sampling instants corresponding
Time domain frequency hopping source signal, uses yn(p,qt)(qt=0,1,2 ..., Nfft- 1) represent；The time domain frequency hopping that above-mentioned all moment are obtained
Source signal yn(p,qt) treatment is merged, obtain final time domain frequency hopping source signal and estimate, specific formula is as follows：
Here Kc=Nfft/ C, C are the sampling number at Short Time Fourier Transform adding window interval, NfftIt is the length of FFT.
3. the direct sequence spread spectrum train-ground communication control system based on internet as claimed in claim 1, it is characterised in that described the
One radio frequency transceiving module is provided with signal detection module, and the signal detecting method of the signal detection module includes following step
Suddenly：
The first step, signal x1 is obtained using frequency mixer by radio frequency or intermediate-freuqncy signal with single-frequency mixing；
Second step, using the high fdrequency component of low pass filter A removal signals x1, the three dB bandwidth of low pass filter A is more than analytic band
Bs wide, obtains signal x2, and now x2 is the signal of zero intermediate frequency, and the signal with a width of Bs is influenceed very little by wave filter A,
It is negligible；
3rd step, two step treatment are carried out by signal x2 simultaneously：First by x2 by low pass filter B, passband is 0--PBs, P<1,
The low-frequency time-domain signal x2L of signal is obtained with a width of PBs；Again by x2 by high-pass filter, passband is PBs-Bs, is obtained
The high frequency time-domain signal x2H of signal is with a width of (1-P) Bs；
4th step, is added up, i.e. the quadratic sum of the mould of time-domain signal using time domain, obtains the energy value EL of signal x2L, and signal
The energy value EH of x2H；
5th step, tries to achieve ratio R=EL/EH；
6th step, thresholding is demarcated, and is repeatedly sought R values to the data for having signal and no signal first, is obtained by statistical probability
Thresholding C1 and C2, C2>The size of C1, C2 value mainly influences the size of false dismissal probability, C1 mainly to influence false alarm probability, selected
Thresholding should ensure that the unfavorable factor of both the above is possible small；
7th step, the renewal of flag bit flag, flag=0 represents that a preceding testing result is no signal, it is this kind of under the conditions of,
Have and work as R>It is judged to currently detected signal during C2, flag is changed into 1；Work as flag=1, represent a preceding testing result to there is letter
Number, it is this kind of under the conditions of, only work as R<It is judged to currently be not detected by signal during C1, flag is changed into 0；
8th step, controls whether subsequent demodulation thread etc. is opened according to flag bit：Flag=1, opens subsequent demodulation thread etc., no
Then close subsequent demodulation thread.
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