CN102778872B - Real-time correction method for dynamic displacement of track circuit reader signal carrier frequency - Google Patents
Real-time correction method for dynamic displacement of track circuit reader signal carrier frequency Download PDFInfo
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- CN102778872B CN102778872B CN201210232135.1A CN201210232135A CN102778872B CN 102778872 B CN102778872 B CN 102778872B CN 201210232135 A CN201210232135 A CN 201210232135A CN 102778872 B CN102778872 B CN 102778872B
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Abstract
The invention relates to a real-time correction method for the dynamic displacement of the track circuit reader signal carrier frequency, which belongs to the railway field and is used for solving the problem that the track circuit reader signal carrier frequency generates dynamic displacement. The real-time correction method comprises the following steps of: obtaining a standard value fc of the track circuit reader signal carrier frequency; calculating a compensation capacitor impedance Zcp in a track circuit; obtaining a train equivalent shunt resistance Rf; calculating a carrier frequency displacement factor beta; obtaining a train running speed vs; calculating the dynamic displacement delta fc of the track circuit reader signal carrier frequency at the running speed; calculating the frequency spectrum of the receiving signal of the track circuit reader by the track circuit reader; and according to the calculation result of the dynamic displacement delta fc, moving the integral frequency spectrum to the zero-frequency direction for delta fc, i.e. subtracting the dynamic displacement delta fc from the carrier frequency f'c in the frequency spectrum so as to realize a corresponding correction process. Information required by the correction method is directly from railway field equipment and can be directly integrated to rail circuit reader equipment, and therefore reliability and accuracy on extracting train target speed information are improved in the high-speed running process of a train.
Description
Technical field
The present invention is about railway territory, and what relate to is a kind of modification method, refers to especially a kind of real-time correcting method of track circuit reader signal carrier frequency dynamic deflection.
Technical background
As the visual plant of guarantee driving safety, at railway, especially vital effect is being brought into play in the train speed control aspect of high-speed railway to train operation control system (being called for short: train control system).Track circuit reader is as one of key equipment of this system, form corresponding track circuit reader signal by carrying out electromagnetic induction with ground rail circuit, recycling respective algorithms extract the target velocity information of the train operation ahead comprising in this signal, and further set it as control train running speed according to sending train control system main frame to.As can be seen here, the generation quality of track circuit reader signal and Changing Pattern are for ensureing that the normal work of train control system and the safe operation of train are very important.
Track circuit reader signal is the continuous frequency shift keyed signals of a kind of phase place, and its signal characteristic mainly comprises: carrier frequency, modulation low frequency, initial phase and amplitude etc.Wherein, although only require that modulation low frequency is corresponding with train operation ahead target velocity information, the characteristic informations such as carrier frequency and amplitude are also the necessary informations of information extraction process.Applicant finds in its research work, because the sample frequency of track circuit reader signal immobilizes, make each sampling number according to corresponding train displacement increment in orbit, can change with the variation of train speed, and this variation finally can cause track circuit reader signal carrier frequency to produce quantitatively skew, and speed is faster, this dynamic offset is larger.Therefore,, in the process of train high-speed cruising, likely can cause corresponding carrier frequency offset to go out its normal indication range, and finally affect the extraction to train operation ahead target velocity information.
Hence one can see that, and the dynamic deflection that need to occur train travelling process middle orbit circuit reader signal carrier frequency is revised in real time, and also there is no corresponding achievement in research or solution at present.Therefore, for ensureing the accurate extraction of track circuit reader to train operation target velocity information, can directly calculate in the urgent need to a kind of the carrier shift that obtains track circuit reader signal, and this signal carrier frequency be made to the method for corresponding real-time correction.This has very important realistic meaning for the traffic safety that ensures railway, especially high-speed railway.
Summary of the invention
For solving above-mentioned track circuit reader signal carrier frequency generation dynamic deflection problem, improve in train high-speed cruising process, to reliability and the accuracy of the information extraction of train target velocity, the invention provides a kind of real-time correcting method of track circuit reader signal carrier frequency dynamic deflection.
For achieving the above object, the present invention adopts following technical proposals:
A real-time correcting method for track circuit reader signal carrier frequency dynamic deflection,
Obtain track-circuit signalling carrier frequency standard value f
c;
Calculate the building-out capacitor impedance in track circuit
;
Obtain train equivalence by-passed resistor R
f;
Calculate carrier shift factor-beta;
Obtain train running speed v
s;
Calculate the dynamic deflection Δ f of the track circuit reader signal carrier frequency under this travelling speed
c;
Track circuit reader calculates the frequency spectrum of its reception signal, and according to dynamic deflection Δ f
cresult of calculation, frequency spectrum entirety is moved to Δ f to zero-frequency direction
c, by the carrier frequency frequency f ＇ in frequency spectrum
cdeduct dynamic deflection Δ f
cthereby, realize corresponding makeover process.
The present invention has following beneficial effect:
1. this modification method information needed is all directly from Railway Site equipment, as speed pickup (train speed), track circuit reader (standard value of track-circuit signalling carrier frequency), and the system service condition of respective specified (rail impedance of building-out capacitor capacitance, unit length and railway ballast resistance, train equivalence by-passed resistor).Therefore, can realize the real-time correction to track circuit reader signal carrier frequency dynamic deflection without carrying out on-the-spot field survey;
2. this modification method fully takes into account the multifactor impacts on track circuit reader signal carrier frequency such as train running speed, line parameter circuit value and locomotive parameters, and accuracy is higher.
Embodiment
To the real-time correcting method of track circuit reader signal carrier frequency dynamic deflection of the present invention be described further below:
The 1st step: according to current of traffic and track circuit reader to received signal carrier frequency according to a preliminary estimate, can determine the standard value f of signal carrier frequency
c;
The 2nd step: according to the track circuit design document of train operation circuit, obtain the rail impedance of unit length
, railway ballast resistance r
d, and building-out capacitor capacitance c, and calculate building-out capacitor impedance
;
The 3rd step: according to the locomotive maximum equivalent by-passed resistor condition of track circuit defined, determine train equivalence by-passed resistor R
f;
The 4th step: calculate the carrier shift factor
.
Wherein,
,
,
,
,
, l
tfor the spacing of two building-out capacitors on track,
for plural number being got to imaginary part operation,
with
represent respectively cosh and sinh operation;
The 5th step: obtain in real time the current travelling speed v of train by train speed sensor
s;
The 6th step: according to formula Δ f
c=β vs/2 π calculates train with speed v
sthe dynamic deflection Δ f of the track circuit reader signal carrier frequency under motion conditions
c;
The 7th step: frequency spectrum entirety is moved to Δ f to zero-frequency direction
c, by the carrier frequency frequency f ＇ in frequency spectrum
cdeduct dynamic deflection Δ f
cthereby, realize corresponding makeover process.
Particularly, below in connection with the preferred embodiments of the present invention, implementation step of the present invention is elaborated.
Need to understand, following description is only example character, but not limitation of the present invention is described.May relate in the following description concrete numeral, but also it is to be understood that, these numerals are only also example character, and those skilled in the art can, with reference to content of the present invention, choose suitable numeral for the track circuit on different rail tracks and calculate.
Taking train in Beijing-reality is obtained while moving on Jin inter-city high-speed rail section track circuit track circuit reader signal is as example, this signal learns through corresponding analysis, its carrier frequency frequency is 2601.55Hz.
Next, taking this track circuit and train operation situation as condition, by the present invention, the skew of track circuit reader signal carrier frequency is revised, its process is as follows:
The 1st step: by the carrier frequency assessment function of track circuit reader, the carrier frequency that obtains this signal is 2600-1 type, i.e. track-circuit signalling carrier frequency standard value f
c=2601.40Hz;
The 2nd step: according to the line design file of the intercity track circuit of Jing-Jin, rail impedance and the railway ballast resistance of getting unit length are respectively
, r
d=6.15 Ω km, and building-out capacitor capacitance c=25 μ f, and calculate building-out capacitor impedance
;
The 3rd step: according to the maximum by-passed resistor condition of the locomotive of track circuit defined, get train equivalence by-passed resistor R here
f=0.25 Ω;
The 4th step: calculate the carrier shift factor
;
The 5th step: measure travelling speed v by train speed sensor
s=340km/h, is converted into v
s=(340/3.6) m/s;
The 6th step: according to formula Δ f
c=β v
s/ 2 π, calculate track circuit reader signal carrier shift Δ f at that time
c=0.01*340/3.6/2 π=0.15Hz;
The 7th step: according to the track circuit reader signal carrier shift Δ f that calculates gained
c=0.15Hz, makes correction to the frequency spectrum entirety of track circuit reader signal, moves 0.15Hz to zero-frequency direction.Signal carrier frequency also, by the practical frequency 2601.55Hz before moving, becomes revised standard carrier frequency 2601.55Hz-0.15Hz=2601.4Hz.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and distortion and not depart from the spirit and scope of the present invention the present invention.Like this, if within these amendments of the present invention and distortion belong to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and distortion interior.
Claims (1)
1. a real-time correcting method for track circuit reader signal carrier frequency dynamic deflection, is characterized in that, described method comprises: obtain track-circuit signalling carrier frequency standard value f
c;
Calculate the building-out capacitor impedance in track circuit
the method of the building-out capacitor impedance in wherein said calculating track circuit is specially, and obtains building-out capacitor capacitance c, according to track-circuit signalling carrier frequency standard value fc and building-out capacitor capacitance c, according to formula
calculate building-out capacitor impedance
Obtain train equivalence by-passed resistor R
f;
Calculate carrier shift factor-beta; The method of the wherein said calculating carrier shift factor is specially, and obtains the rail impedance of track circuit unit length
with railway ballast resistance r
d, according to formula
calculate carrier shift factor-beta, wherein
l
tfor the spacing of two building-out capacitors on track, Im () is for getting imaginary part operation to plural number, and ch () and sh () represent respectively cosh and sinh operation;
Obtain train running speed v
s;
Calculate the dynamic deflection △ f of the track circuit reader signal carrier frequency under this travelling speed
c; The dynamic deflection △ f of wherein said calculating track circuit reader signal carrier frequency
cmethod be specially, according to formula △ f
c=β v
s/ 2 π calculate train with speed v
sthe dynamic deflection △ f of the track circuit reader signal carrier frequency under motion conditions
c;
Track circuit reader calculates the frequency spectrum of its reception signal, and according to dynamic deflection △ f
cresult of calculation, frequency spectrum entirety is removed to zero-frequency direction
Move △ f
c, by the carrier frequency frequency f in frequency spectrum
c' deduct dynamic deflection △ f
cthereby, realize corresponding makeover process.
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|---|---|---|---|
| CN201210232135.1A CN102778872B (en) | 2012-07-05 | 2012-07-05 | Real-time correction method for dynamic displacement of track circuit reader signal carrier frequency |
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|---|---|---|---|
| CN201210232135.1A CN102778872B (en) | 2012-07-05 | 2012-07-05 | Real-time correction method for dynamic displacement of track circuit reader signal carrier frequency |
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| CN102778872B true CN102778872B (en) | 2014-07-23 |
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| CN102267478A (en) * | 2011-05-16 | 2011-12-07 | 铁道部运输局 | Train-mounted device for train control system and method for demodulating track-circuit signal |
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2012
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Patent Citations (4)
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| CN1258457C (en) * | 2003-10-23 | 2006-06-07 | 北京交大思诺科技有限公司 | Vehicle testing method for rail circuit leckage resistamce and its testing equipment |
| US7872583B1 (en) * | 2005-12-15 | 2011-01-18 | Invisitrack, Inc. | Methods and system for multi-path mitigation in tracking objects using reduced attenuation RF technology |
| CN102004246A (en) * | 2010-09-10 | 2011-04-06 | 浙江大学 | Fault diagnosis and reading speed correction method of antenna included angle deviation of train vehicle-mounted radar speed sensor and |
| CN102267478A (en) * | 2011-05-16 | 2011-12-07 | 铁道部运输局 | Train-mounted device for train control system and method for demodulating track-circuit signal |
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| Title |
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| Instruments》.2005,全文. * |
| Zhao Lin-hai et al..Application of Wavelets Analysis Technique in the Analyzing and Processing of Frequency Shift signal.《Proceedings of the Seventh International Conference on Electronic Measurement & Instruments》.2005,全文. |
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| 基于HHT、DBWT的无绝缘轨道电路补偿电容故障诊断;赵林海等;《铁道学报》;20110331;第33卷(第03期);第49-54页 * |
| 赵林海等.基于AOK-TFR的轨道电路故障诊断方法.《西南交通大学学报》.2011,第46卷(第01期),第84-91页. |
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