CN102778872A - 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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- CN102778872A CN102778872A CN2012102321351A CN201210232135A CN102778872A CN 102778872 A CN102778872 A CN 102778872A CN 2012102321351 A CN2012102321351 A CN 2012102321351A CN 201210232135 A CN201210232135 A CN 201210232135A CN 102778872 A CN102778872 A CN 102778872A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012937 correction Methods 0.000 title claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 title abstract description 8
- 238000001228 spectrum Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000003137 locomotive effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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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 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 invention relates to the field of railways, in particular to a method for correcting the dynamic offset of a track circuit reader signal carrier frequency in real time.
Technical Field
The train operation control system (train control system for short) plays an important role in the train speed control of railways, especially high-speed railways, as an important device for guaranteeing the driving safety. The track circuit reader is used as one of key equipment of the system, forms a corresponding track circuit reader signal by performing electromagnetic induction with a ground track circuit, extracts target speed information in front of train running contained in the signal by using a corresponding algorithm, and further transmits the target speed information to a train control system host as a basis for controlling the train running speed. Therefore, the generation quality and the change rule of the track circuit reader signals are very important for guaranteeing the normal work of a train control system and the safe operation of a train.
The track circuit reader signal is a frequency shift keying signal with continuous phases, and the signal characteristics mainly comprise: carrier frequency, modulation low frequency, initial phase and amplitude, etc. Although only the modulation low frequency is required to correspond to the target speed information before the train operation, the characteristic information such as the carrier frequency and the amplitude is also necessary information in the information extraction process. In the research work of the applicant, the applicant finds that because the sampling frequency of the track circuit reader signal is fixed and unchanged, the displacement increment of the train on the track corresponding to each sampling point data changes along with the change of the train speed, and the change finally causes the carrier frequency of the track circuit reader signal to generate quantitative offset, and the faster the speed is, the larger the dynamic offset is. Therefore, in the process of high-speed train operation, the corresponding carrier frequency may shift out of the normal index range, and the extraction of the target speed information before train operation is finally affected.
Therefore, the dynamic offset generated by the signal carrier frequency of the track circuit reader in the running process of the train needs to be corrected in real time, and no corresponding research result or solution exists at present. Therefore, in order to ensure that the track circuit reader accurately extracts the speed information of the train operation target, a method which can directly calculate and obtain the carrier frequency offset of the track circuit reader signal and correspondingly correct the signal carrier frequency in real time is urgently needed. The method has very important practical significance for guaranteeing the traffic safety of railways, particularly high-speed railways.
Disclosure of Invention
In order to solve the problem that the signal carrier frequency of the track circuit reader is dynamically offset and improve the reliability and accuracy of extracting the target speed information of the train in the high-speed running process of the train, the invention provides a real-time correction method for the signal carrier frequency dynamic offset of the track circuit reader.
In order to achieve the purpose, the invention adopts the following technical scheme:
a real-time correction method for dynamic carrier frequency offset of track circuit reader,
obtaining the standard value f of the carrier frequency of the track circuit signalc；
Calculating compensating capacitive impedance in a track circuit
；
Obtaining the equivalent shunt resistance R of the trainf；
Calculating a carrier frequency offset factor beta;
obtaining the running speed v of the trains；
Calculating the dynamic deviation deltaf of the carrier frequency of the track circuit reader signal at the running speedc；
The track circuit reader calculates the frequency spectrum of its received signal and based on the dynamic offset deltafcShifting the whole spectrum to the zero frequency direction by delta fcI.e. carrier frequency f' in the frequency spectrumcSubtracting the dynamic offset Δ fcThus realizing the corresponding correction process.
The invention has the following beneficial effects:
1. the information required by the correction method is directly from railway field equipment, such as a speed sensor (train speed), a track circuit reader (a standard value of a track circuit signal carrier frequency) and correspondingly specified system use conditions (a compensation capacitance value, unit length steel rail impedance and ballast resistance and train equivalent shunt resistance). Therefore, the real-time correction of the dynamic offset of the signal carrier frequency of the track circuit reader can be realized without field measurement;
2. The correction method fully considers the influence of a plurality of factors such as train running speed, line parameters, locomotive parameters and the like on the signal carrier frequency of the track circuit reader, and has high accuracy.
Detailed Description
The real-time correction method for the dynamic carrier frequency offset of the track circuit reader signal according to the present invention will be further described as follows:
step 1: according to the train running direction and the initial estimation of the track circuit reader to the received signal carrier frequency, the standard value f of the signal carrier frequency can be determinedc；
Step 2: according to the track circuit design file of the train operation line, the steel rail impedance of unit length is obtained
Ballast resistor rdAnd a capacitance value c of the compensation capacitor, and calculating the impedance of the compensation capacitor
；
And 3, step 3: determining the equivalent shunt resistance R of the train according to the maximum equivalent shunt resistance condition of the locomotive specified by the track circuitf；
And 4, step 4: calculating carrier frequency offset factor
。
Wherein,
、、
， 
，
，ltthe distance between the two compensation capacitors on the track,in order to operate on the imaginary part of the complex number,
and
respectively representing hyperbolic cosine and hyperbolic sine operations;
and 5, step 5: real-time obtaining current running speed v of train by train speed sensors；
And 6, step 6: according to the formula Δ fcCalculating the speed v of the train by = beta vs/2 pisDynamic offset deltaf of track circuit reader signal carrier frequency under motion c；
And 7, step 7: shift the whole frequency spectrum to the zero frequency direction by delta fcI.e. carrier frequency f' in the frequency spectrumcSubtracting the dynamic offset Δ fcThus realizing the corresponding correction process.
Specifically, the following will describe the implementation steps of the present invention in detail with reference to the preferred embodiments thereof.
It is to be understood that the following description is only exemplary in nature and is not intended as a restrictive description of the invention. In the following description specific numbers may be referred to, however it is also to be understood that these numbers are also only exemplary and that a person skilled in the art may, with reference to the present disclosure, choose appropriate numbers for track circuits on different railway lines to calculate.
Taking a track circuit reader signal actually obtained when a train runs on a certain section of track circuit of the Jing-jin intercity high-speed railway as an example, the signal is correspondingly analyzed, and the carrier frequency of the signal is 2601.55 Hz.
Then, based on the track circuit and train operation condition, the invention corrects the deviation of the track circuit reader signal carrier frequency, the process is as follows:
step 1: the carrier frequency of the signal is obtained to be 2600-1 type by the carrier frequency estimation function of the track circuit reader, namely the carrier frequency standard value f of the track circuit signal c=2601.40Hz；
Step 2: according to the line design file of the Jing-jin intercity track circuit, the steel rail impedance and the ballast resistance of a unit length are respectively taken as
、rd=6.15 Ω km, and the compensation capacitance value c =25 μ f, and the compensation capacitance impedance is calculated
；
And 3, step 3: according to the maximum shunt resistance condition of the locomotive specified by the track circuit, the equivalent shunt resistance R of the train is takenf=0.25Ω；
And 4, step 4: calculating carrier frequency offset factor
；
And 5, step 5: determination of the speed v of operation by a train speed sensors=340km/h, reduced to vs=(340/3.6)m/s；
And 6, step 6: according to the formula Δ fc=βvsA/2 pi, calculating to obtain the carrier frequency deviation delta f of the track circuit reader signal at that timec=0.01*340/3.6/2π=0.15Hz；
And 7, step 7: according to the calculated carrier frequency deviation delta f of the track circuit reader signalcAnd =0.15Hz, the frequency spectrum of the track circuit reader signal is corrected as a whole, namely, the track circuit reader signal is shifted to the zero frequency direction by 0.15 Hz. The signal carrier frequency is also changed from the actual measurement frequency 2601.55Hz before the movement to the standard carrier frequency 2601.55Hz-0.15Hz =2 after the correction601.4Hz。
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (4)
1. A method for real-time correction of carrier frequency dynamic offset of track circuit reader signals, the method comprising:
obtaining the standard value f of the carrier frequency of the track circuit signalc；
Calculating compensating capacitive impedance in a track circuit
；
Obtaining the equivalent shunt resistance R of the trainf；
Calculating a carrier frequency offset factor beta;
obtaining the running speed v of the trains；
Calculating the dynamic deviation deltaf of the carrier frequency of the track circuit reader signal at the running speedc；
The track circuit reader calculates the frequency spectrum of its received signal and based on the dynamic offset deltafcShifting the whole spectrum to the zero frequency direction by delta fcI.e. carrier frequency f' in the frequency spectrumcSubtracting the dynamic offset Δ fcThus realizing the corresponding correction process.
2. The method of claim 1, wherein the method of calculating the compensation capacitive impedance in the track circuit is embodied as:
obtaining a capacitance value c of the compensation capacitor;
according to the standard value f of the track circuit signal carrier frequencycAnd the capacitance value c of the compensation capacitor according to the formula
Calculating the impedance of the compensating capacitor
。
3. The method of claim 1, wherein the method for calculating the carrier frequency offset factor specifically comprises:
obtaining rail impedance per unit length of track circuit
And ballast resistor r d；
According to the formula
Calculating a carrier frequency offset factor beta, wherein <math>
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</math> ，ltThe distance between the two compensation capacitors on the track,
the imaginary part is taken for the complex number.
4. The method of claim 1, wherein the calculating the dynamic offset Δ f of the carrier frequency of the track circuit reader signalcThe method comprises the following steps:
according to the formula Δ fc=βvsThe speed v of the train is calculated by the speed 2 pisDynamic offset deltaf of track circuit reader signal carrier frequency under motionc。
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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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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 |
-
2012
- 2012-07-05 CN CN201210232135.1A patent/CN102778872B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| 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》 * |
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| 赵林海等: "基于HHT、DBWT的无绝缘轨道电路补偿电容故障诊断", 《铁道学报》 * |
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