CN101701981A - Frequency shift parameter measuring system of frequency shift track circuit and measuring method thereof - Google Patents
Frequency shift parameter measuring system of frequency shift track circuit and measuring method thereof Download PDFInfo
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- CN101701981A CN101701981A CN200910309292A CN200910309292A CN101701981A CN 101701981 A CN101701981 A CN 101701981A CN 200910309292 A CN200910309292 A CN 200910309292A CN 200910309292 A CN200910309292 A CN 200910309292A CN 101701981 A CN101701981 A CN 101701981A
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Abstract
The invention discloses a frequency shift parameter measuring system of a frequency shift track circuit, comprising a signal conditioning circuit, a true RMS measuring circuit, an analog digital conversion module and a data processing module which are successively connected, wherein the data processing module is connected with the signal conditioning circuit and is also connected with a zero-crossing detection circuit and a power management module; the zero-crossing detection circuit is connected with the signal conditioning circuit, and the power management module is respectively connected with the analog digital conversion module, the signal conditioning circuit, the true RMS measuring circuit and the zero-crossing detection circuit. When the system is adopted to measure, a completely continuous multi-cycle synchronous frequency measuring method is combined with statistics to measure the frequency and frequency deviation of carrier frequency; low frequency is measured by combining a multi-cycle continuous counting method with a table lookup method, so that the invention has high measurement precision and small algorithm complexity and gives consideration to measurement precision and instantaneity. Meanwhile, singlechip or CPLD or FPGA can be adopted to realize, which lowers system hardware cost.
Description
Technical field
The invention belongs to the signal measurement technique field, relate to a kind of railway signal measuring system, be specifically related to a kind of shift frequency parameter measurement system of frequency shift modulated track circuit, the invention still further relates to the method for utilizing said system to measure.
Background technology
In the railway system, mainly be to regulate and control for train operation, to guarantee traffic safety by the shift frequency block system.At present mainly adopt the method for software to finish based on fast fourier transform (Fast FourierTransformation FFT) algorithm to the measurement of frequency-shift signaling, the complexity of software algorithm is by the resolution decision to frequency in this method, want to improve measuring accuracy to frequency, the calculating that must increase fft algorithm is counted, frequency measurement for high-precision requirement, certainly will require counting of fft algorithm many, cause its algorithm complex height, influence the real-time of system in actual applications, therefore propose a kind of measuring accuracy height, shift frequency parameter measurement system that real-time is good and method have great importance to the practicality that improves system.
Summary of the invention
The shift frequency parameter measurement system that the purpose of this invention is to provide a kind of frequency shift modulated track circuit, it is not high to have solved existing shift frequency parameter measurement system measuring accuracy, and real-time is bad, the algorithm complicated problems.
Another object of the present invention provides the method that a kind of shift frequency parameter measurement system of using frequency shift modulated track circuit is measured.
The technical solution adopted in the present invention is, a kind of shift frequency parameter measurement system of frequency shift modulated track circuit, comprise the signal conditioning circuit, true rms measurement circuit, analog-to-digital conversion module and the data processing module that connect successively, data processing module also is connected with signal conditioning circuit, also be connected with zero-crossing detection circuit and power management module on the data processing module, zero-crossing detection circuit also is connected with signal conditioning circuit, and power management module also is connected with analog-to-digital conversion module, signal conditioning circuit, true rms measurement circuit, zero-crossing detection circuit respectively.
Another technical scheme of the present invention is, the method that a kind of shift frequency parameter measurement system of using frequency shift modulated track circuit is measured is specifically implemented according to following steps:
Step 1: power management module is to signal conditioning circuit, true rms measurement circuit, analog-to-digital conversion module, zero-crossing detection circuit and data processing module power supply, tested frequency-shift signaling is input to signal conditioning circuit, signal conditioning circuit carries out the data preconditioned to tested frequency-shift signaling, tested frequency-shift signaling is decayed in the safe voltage scope frequency-shift signaling after obtaining decaying;
Step 2: the frequency-shift signaling that signal conditioning circuit will be gone up after the decay that obtains of step passes to the true rms measurement circuit, obtains the real effective simulating signal after the decay;
Step 3: the real effective simulating signal that the true rms measurement circuit will be gone up after the decay that obtains of step passes to analog-to-digital conversion module, carries out the real effective digital signal after analog to digital conversion obtains decaying;
Step 4: the real effective digital signal transfers that analog-to-digital conversion module will be gone up after the decay that obtains of step is given data processing module, obtains the very effectively initial value of tested frequency-shift signaling through data processing;
Step 5: data processing module is given signal conditioning circuit according to the very effectively initial value output control signal of the tested frequency-shift signaling that the last step obtains, after making signal conditioning circuit adjust enlargement factor tested frequency-shift signaling is nursed one's health, the amplitude of the frequency-shift signaling after the conditioning is in the suitable scope;
Step 6: the shift frequency parameter that detects tested frequency-shift signaling: very effectively carrier frequency frequency, frequency deviation and the low frequency frequency of final value, tested frequency-shift signaling of tested frequency-shift signaling,
Detect the very effectively final value of tested frequency-shift signaling, specifically implement according to following steps:
A. the frequency-shift signaling after the conditioning that step 5 is obtained passes to the true rms measurement circuit, obtains the real effective simulating signal after the conditioning;
The real effective simulating signal that b. will go up after the conditioning that obtains of step passes to analog-to-digital conversion module, carries out the real effective digital signal after analog to digital conversion obtains nursing one's health;
The real effective digital signal transfers that c. will go up after the conditioning that obtains of step is given data processing module, obtains the very effectively final value of tested frequency-shift signaling through data processing;
Detect carrier frequency frequency, frequency deviation and the low frequency frequency of tested frequency-shift signaling, specifically implement according to following steps:
A. the frequency-shift signaling after the conditioning that step 5 is obtained inputs to zero-detection circuit and carries out shaping, obtains the frequency-shift signaling after the shaping;
B. will go up frequency-shift signaling and standard clock signal access data processing module after the shaping that obtains of step, and adopt certain algorithm to obtain the carrier frequency frequency of tested frequency-shift signaling, frequency deviation and low frequency frequency.
Characteristics of the present invention also are,
Data processing module is wherein selected CPLD, FPGA or single-chip microcomputer for use;
The certain algorithm of employing is wherein obtained carrier frequency frequency, frequency deviation and the low frequency frequency of tested frequency-shift signaling, specifically implements according to following steps:
A. the Measurement Algorithm of carrier frequency frequency and frequency deviation is: produce a high standard clock signal f more than 1000 times of frequency ratio carrier frequency frequency simultaneously
0, catch standard clock signal and frequency-shift signaling f with logic gates
xBe in the moment of rising edge simultaneously, two adjacent synchronization points as a count cycle, are used standard clock signal f
0With frequency-shift signaling f
xAs the count pulse of counter A sum counter B, write down the count value N of the count value M sum counter B of a count cycle inside counting device A, respectively then by formula
MT
x＝NT
0
Calculate the frequency f of each cycle correspondence
x, this frequency may be upper side frequency, the lower side frequency of frequency-shift signaling or go up the intermediate frequency that lower side frequency replaces the moment that so continuous coverage goes out a plurality of frequency values, counts the maximum and inferior f how of occurrence number in a series of frequency values
xValue is two side frequencys of automatic block with audio frequency shift modulated track circuit signal, i.e. upper side frequency and lower side frequency are according to the carrier frequency frequency f
Carrier frequencyExpression formula:
Expression formula with frequency deviation Δ f:
Obtain the carrier frequency frequency and the frequency deviation of tested frequency-shift signaling;
B. the Measurement Algorithm of low frequency frequency is: with the adjacent rising edge of the frequency-shift signaling after the shaping is the count cycle, count than the high standard clock signal more than 1000 times of frequency-shift signaling frequency with one, several cycles of continuous counter, find out the one-period of low frequency frequency according to the size of each cycle count value, obtain the size of total count value in each low-frequency cycle then, used standard time clock frequency is set up corresponding relation between low frequency frequency and the count value according to system when software or hardware are realized, adopts the method for tabling look-up can obtain the low frequency frequency at last.
The invention has the beneficial effects as follows, adopt fully synchronous continuously frequency measurement method of multicycle to measure carrier frequency frequency and frequency deviation with the method that statistics combines, adopt multicycle continuous counter method to combine and measure the low frequency frequency with look-up table, improved measuring accuracy on the one hand, the algorithm complex aspect greatly reduces than traditional FFT method operand on the other hand, the T.T. length of measuring can be finished in several low-frequency cycles, thereby had guaranteed taking into account of measuring accuracy and real-time.Simultaneously, because the reduction of algorithm complex, the specific implementation of this algorithm can adopt single-chip microcomputer or CPLD or FPGA to realize, has reduced the hardware cost of system.
Description of drawings
Fig. 1 is the structural representation of the shift frequency parameter measurement system of frequency shift modulated track circuit of the present invention;
Fig. 2 is for having no chance track frequency-shift signaling synoptic diagram in the measuring system of the present invention;
Fig. 3 is the measuring method synoptic diagram of carrier frequency frequency and frequency deviation in the measuring method of the present invention.
Among the figure, 1. signal conditioning circuit, 2. true rms measurement circuit, 3. analog-to-digital conversion module, 4. data processing module, 5. zero-crossing detection circuit, 6. power management module.
Embodiment
The present invention is described in detail below in conjunction with the drawings and the specific embodiments.
Naked shift frequency track signal as shown in Figure 2, frequency-shift signaling is respectively upper side frequency f by frequency
OnWith lower side frequency f
DownSignal with the low frequency frequency f
LowAlternately occur, then the carrier frequency frequency f
Carrier frequencyFor
Frequency deviation Δ f is
The structure of the shift frequency parameter measurement system of frequency shift modulated track circuit of the present invention, as shown in Figure 1, comprise the signal conditioning circuit 1 that connects successively, true rms measurement circuit 2, analog-to-digital conversion module 3 and data processing module 4, data processing module 4 also is connected with signal conditioning circuit 1, also be connected with zero-crossing detection circuit 5 and power management module 6 on the data processing module 4, zero-crossing detection circuit 5 also is connected with signal conditioning circuit 1, power management module 6 also respectively with analog-to-digital conversion module 3, signal conditioning circuit 1, true rms measurement circuit 2, zero-crossing detection circuit 5 is connected.Data processing module 4 is selected CPLD, FPGA or single-chip microcomputer for use.
The present invention uses the method that the shift frequency parameter measurement system of frequency shift modulated track circuit is measured, and specifically implements according to following steps:
Step 1: 6 pairs of signal conditioning circuits 1 of power management module, true rms measurement circuit 2, analog-to-digital conversion module 3, data processing module 4 and zero-crossing detection circuit 5 power supplies, tested frequency-shift signaling is input to signal conditioning circuit 1,1 pair of tested frequency-shift signaling of signal conditioning circuit carries out preliminary data preconditioned, tested frequency-shift signaling is decayed in the safe voltage scope frequency-shift signaling after obtaining decaying;
Step 2: the frequency-shift signaling that will go up after the decay that obtains of step passes to true rms measurement circuit 2, obtains the real effective simulating signal after the decay;
Step 3: the real effective simulating signal that will go up after the decay that obtains of step passes to analog-to-digital conversion module 3, carries out the real effective digital signal after analog to digital conversion obtains decaying;
Step 4: the real effective digital signal transfers that will go up after the decay that obtains of step is given data processing module 4, obtains the very effectively initial value of tested frequency-shift signaling through data processing;
Step 5: data processing module 4 is given signal conditioning circuit 1 according to the very effectively initial value output control signal of the tested frequency-shift signaling that the last step obtains, after making signal conditioning circuit 1 adjust enlargement factor tested frequency-shift signaling is nursed one's health, the amplitude of the frequency-shift signaling after the conditioning is in the suitable scope;
Step 6: the shift frequency parameter that detects tested frequency-shift signaling: very effectively carrier frequency frequency, frequency deviation and the low frequency frequency of final value, tested frequency-shift signaling of tested frequency-shift signaling.
On the one hand, detect the very effectively final value of tested frequency-shift signaling, specifically implement according to following steps:
A. the frequency-shift signaling after the conditioning that step 5 is obtained passes to true rms measurement circuit 2, obtains the real effective simulating signal after the conditioning;
The real effective simulating signal that b. will go up after the conditioning that obtains of step passes to analog-to-digital conversion module 3, carries out the real effective digital signal after analog to digital conversion obtains nursing one's health;
The real effective digital signal transfers that c. will go up after the conditioning that obtains of step is given data processing module 4, obtains the very effectively final value of tested frequency-shift signaling through data processing;
On the other hand, detect carrier frequency frequency, frequency deviation and the low frequency frequency of tested frequency-shift signaling, specifically implement according to following steps:
A. the frequency-shift signaling after the conditioning that step 5 is obtained inputs to zero-detection circuit 5 and carries out shaping, obtains the frequency-shift signaling after the shaping;
B. will go up frequency-shift signaling and standard clock signal access data processing module 4 after the shaping that obtains of step, and adopt certain algorithm to obtain the carrier frequency frequency of tested frequency-shift signaling, frequency deviation and low frequency frequency.
Adopt full frequency measuring method synchronously of continuous multicycle to measure upper side frequency and lower side frequency for the measurement of carrier frequency frequency and frequency deviation, thereby obtain carrier frequency and frequency deviation with the method that statistics combines; Adopt multicycle continuous counter and the method that statistics combines for the measurement of low frequency frequency, measure a total count value of low-frequency cycle, adopt the method for tabling look-up to obtain the low frequency frequency at last.The specific implementation of Measurement Algorithm adopts CPLD (CPLD Complicate Programmable LogicDevice) or FPGA (field programmable gate array Field Programmable Gate Array) or chip microcontroller.
Measure the algorithm of carrier frequency frequency, frequency deviation and the employing of low frequency frequency of tested frequency-shift signaling, specifically implement according to following steps:
(1) measuring method of carrier frequency frequency and frequency deviation is as follows: as shown in Figure 3, produce a high standard clock signal f more than 1000 times of frequency ratio carrier frequency frequency simultaneously
0, catch standard clock signal and frequency-shift signaling f with logic gates
xBe in the moment (being called synchronization point) of rising edge simultaneously, two adjacent synchronization points as a count cycle, are used standard clock signal f
0With frequency-shift signaling f
xAs the count pulse of counter A sum counter B, write down the count value N of the count value M sum counter B of a count cycle inside counting device A, respectively then by formula
NT
x＝NT
0 (3)
Calculate the frequency f of each cycle correspondence
x, this frequency may be upper side frequency, the lower side frequency of frequency-shift signaling or go up the intermediate frequency that lower side frequency replaces the moment that so continuous coverage goes out a plurality of frequency values, counts the maximum and inferior f how of occurrence number in a series of frequency values
xBe worth, be two side frequencys of automatic block with audio frequency shift modulated track circuit signal, i.e. upper side frequency and lower side frequency.Use afterwards formula (1) and formula (2) obtain carrier frequency or the centre frequency and the frequency deviation of corresponding frequency-shift signaling.
(2) measuring method of low frequency frequency is as follows: with the adjacent rising edge of the frequency-shift signaling after the shaping is the count cycle, count than the high standard clock signal more than 1000 times of frequency-shift signaling frequency with one, several cycles of continuous counter (guaranteeing that the tale time is greater than at least one low-frequency cycle), find out the one-period of low frequency frequency according to the size of each cycle count value, obtain the size of total count value in each low-frequency cycle then, because for the different low-frequency cycles, the standard clock signal number difference of being counted, after considering counting and the error brought of software and hardware, used standard time clock frequency is set up corresponding relation between low frequency frequency and the count value according to system when software or hardware are realized, adopts the method for tabling look-up can obtain the low frequency frequency at last.
The shift frequency parameter measurement system and the measuring method of frequency shift modulated track circuit of the present invention, adopt fully synchronous continuously frequency measurement method of multicycle to measure carrier frequency frequency and frequency deviation with the method that statistics combines, adopt multicycle continuous counter method to combine and measure the low frequency frequency with look-up table, improved measuring accuracy on the one hand, the algorithm complex aspect greatly reduces than traditional FFT method operand on the other hand, the T.T. length of measuring can be finished in several low-frequency cycles, thereby had guaranteed taking into account of measuring accuracy and real-time.Simultaneously, because the reduction of algorithm complex, the specific implementation of this algorithm can adopt single-chip microcomputer or CPLD or FPGA to realize, has reduced the hardware cost of system.
Claims (4)
1. the shift frequency parameter measurement system of a frequency shift modulated track circuit, it is characterized in that, comprise the signal conditioning circuit (1) that connects successively, true rms measurement circuit (2), analog-to-digital conversion module (3) and data processing module (4), data processing module (4) also is connected with signal conditioning circuit (1), also be connected with zero-crossing detection circuit (5) and power management module (6) on the data processing module (4), zero-crossing detection circuit (5) also is connected with signal conditioning circuit (1), power management module (6) also respectively with analog-to-digital conversion module (3), signal conditioning circuit (1), true rms measurement circuit (2), zero-crossing detection circuit (5) is connected.
2. according to the described shift frequency parameter measurement system of claim 1, it is characterized in that described data processing module (4) is selected CPLD, FPGA or single-chip microcomputer for use.
3. method that application rights requires the shift frequency parameter measurement system of 1 described frequency shift modulated track circuit to measure, it is characterized in that, adopt the shift frequency parameter measurement system of frequency shift modulated track circuit, comprise the signal conditioning circuit (1) that connects successively, true rms measurement circuit (2), analog-to-digital conversion module (3) and data processing module (4), data processing module (4) also is connected with signal conditioning circuit (1), also be connected with zero-crossing detection circuit (5) and power management module (6) on the data processing module (4), zero-crossing detection circuit (5) also is connected with signal conditioning circuit (1), power management module (6) also respectively with analog-to-digital conversion module (3), signal conditioning circuit (1), true rms measurement circuit (2), zero-crossing detection circuit (5) is connected
Specifically implement according to following steps:
Step 1: power management module (6) is to signal conditioning circuit (1), true rms measurement circuit (2), analog-to-digital conversion module (3), data processing module (4) and zero-crossing detection circuit (5) power supply, tested frequency-shift signaling is input to signal conditioning circuit (1), signal conditioning circuit (1) carries out the data preconditioned to tested frequency-shift signaling, tested frequency-shift signaling is decayed in the safe voltage scope frequency-shift signaling after obtaining decaying;
Step 2: the frequency-shift signaling that signal conditioning circuit (1) will be gone up after the decay that obtains of step passes to true rms measurement circuit (2), obtains the real effective simulating signal after the decay;
Step 3: the real effective simulating signal that true rms measurement circuit (2) will be gone up after the decay that obtains of step passes to analog-to-digital conversion module (3), carries out the real effective digital signal after analog to digital conversion obtains decaying;
Step 4: the real effective digital signal transfers that analog-to-digital conversion module (3) will be gone up after the decay that obtains of step is given data processing module (4), obtains the very effectively initial value of tested frequency-shift signaling through data processing;
Step 5: data processing module (4) is given signal conditioning circuit (1) according to the very effectively initial value output control signal of the tested frequency-shift signaling that the last step obtains, after making signal conditioning circuit (1) adjust enlargement factor tested frequency-shift signaling is nursed one's health, the amplitude of the frequency-shift signaling after the conditioning is in the suitable scope;
Step 6: the shift frequency parameter that detects tested frequency-shift signaling: very effectively carrier frequency frequency, frequency deviation and the low frequency frequency of final value, tested frequency-shift signaling of tested frequency-shift signaling,
Detect the very effectively final value of tested frequency-shift signaling, specifically implement according to following steps:
A. the frequency-shift signaling after the conditioning that step 5 is obtained passes to true rms measurement circuit (2), obtains the real effective simulating signal after the conditioning;
The real effective simulating signal that b. will go up after the conditioning that obtains of step passes to analog-to-digital conversion module (3), carries out the real effective digital signal after analog to digital conversion obtains nursing one's health;
The real effective digital signal transfers that c. will go up after the conditioning that obtains of step is given data processing module (4), obtains the very effectively final value of tested frequency-shift signaling through data processing;
Detect carrier frequency frequency, frequency deviation and the low frequency frequency of tested frequency-shift signaling, specifically implement according to following steps:
A. the frequency-shift signaling after the conditioning that step 5 is obtained inputs to zero-detection circuit (5) and carries out shaping, obtains the frequency-shift signaling after the shaping;
B. will go up frequency-shift signaling and standard clock signal access data processing module (4) after the shaping that obtains of step, and adopt certain algorithm to obtain the carrier frequency frequency of tested frequency-shift signaling, frequency deviation and low frequency frequency.
4. the method that the shift frequency parameter measurement system of application frequency shift modulated track circuit according to claim 3 is measured, it is characterized in that, the certain algorithm of described employing is obtained carrier frequency frequency, frequency deviation and the low frequency frequency of tested frequency-shift signaling, specifically implements according to following steps:
A. the Measurement Algorithm of carrier frequency frequency and frequency deviation is: produce a high standard clock signal f more than 1000 times of frequency ratio carrier frequency frequency simultaneously
0, catch standard clock signal and frequency-shift signaling f with logic gates
xBe in the moment of rising edge simultaneously, two adjacent synchronization points as a count cycle, are used standard clock signal f
0With frequency-shift signaling f
xAs the count pulse of counter A sum counter B, write down the count value N of the count value M sum counter B of a count cycle inside counting device A, respectively then by formula
MT
x＝NT
0
Calculate the frequency f of each cycle correspondence
x, this frequency may be upper side frequency, the lower side frequency of frequency-shift signaling or go up the intermediate frequency that lower side frequency replaces the moment that so continuous coverage goes out a plurality of frequency values, counts the maximum and inferior f how of occurrence number in a series of frequency values
xValue is two side frequencys of automatic block with audio frequency shift modulated track circuit signal, i.e. upper side frequency and lower side frequency, according to the expression formula of carrier frequency frequency f carrier frequency:
Expression formula with frequency deviation Δ f:
Obtain the carrier frequency frequency and the frequency deviation of tested frequency-shift signaling;
B. the Measurement Algorithm of low frequency frequency is: with the adjacent rising edge of the frequency-shift signaling after the shaping is the count cycle, count than the high standard clock signal more than 1000 times of frequency-shift signaling frequency with one, several cycles of continuous counter, find out the one-period of low frequency frequency according to the size of each cycle count value, obtain the size of total count value in each low-frequency cycle then, used standard time clock frequency is set up corresponding relation between low frequency frequency and the count value according to system when software or hardware are realized, adopts the method for tabling look-up can obtain the low frequency frequency at last.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949977A (en) * | 2010-06-02 | 2011-01-19 | 华南理工大学 | Railway frequency shift signal anti-interference device and method based on blind source separation |
| CN102717817A (en) * | 2012-06-27 | 2012-10-10 | 李志恒 | System and method for publishing information at high speed railway platform |
| CN102717818A (en) * | 2012-06-27 | 2012-10-10 | 李志恒 | System and method for prompting transferring information in car when high-speed railway train arrives at station |
| CN103884909A (en) * | 2014-02-18 | 2014-06-25 | 西南交通大学 | Low-signal-to-noise ratio track frequency shift signal high accuracy detection method based on sparse decomposition |
| CN104459312A (en) * | 2014-12-03 | 2015-03-25 | 柳州铁道职业技术学院 | Frequency shift signal frequency indicator for automatic blocking practical training device |
| CN103884909B (en) * | 2014-02-18 | 2016-11-30 | 中国铁路总公司 | Low signal-to-noise ratio track frequency-shifting signal high-precision detecting method based on Its Sparse Decomposition |
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2009
- 2009-11-04 CN CN200910309292A patent/CN101701981A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949977A (en) * | 2010-06-02 | 2011-01-19 | 华南理工大学 | Railway frequency shift signal anti-interference device and method based on blind source separation |
| CN101949977B (en) * | 2010-06-02 | 2012-12-05 | 华南理工大学 | Railway frequency shift signal anti-interference method based on blind source separation |
| CN102717817A (en) * | 2012-06-27 | 2012-10-10 | 李志恒 | System and method for publishing information at high speed railway platform |
| CN102717818A (en) * | 2012-06-27 | 2012-10-10 | 李志恒 | System and method for prompting transferring information in car when high-speed railway train arrives at station |
| CN102717817B (en) * | 2012-06-27 | 2015-07-01 | 李志恒 | System and method for publishing information at high speed railway platform |
| CN102717818B (en) * | 2012-06-27 | 2015-07-01 | 李志恒 | System and method for prompting transferring information in car when high-speed railway train arrives at station |
| CN103884909A (en) * | 2014-02-18 | 2014-06-25 | 西南交通大学 | Low-signal-to-noise ratio track frequency shift signal high accuracy detection method based on sparse decomposition |
| CN103884909B (en) * | 2014-02-18 | 2016-11-30 | 中国铁路总公司 | Low signal-to-noise ratio track frequency-shifting signal high-precision detecting method based on Its Sparse Decomposition |
| CN104459312A (en) * | 2014-12-03 | 2015-03-25 | 柳州铁道职业技术学院 | Frequency shift signal frequency indicator for automatic blocking practical training device |
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Open date: 20100505 |