CN111600822A - Universal frequency shift keying signal test system for rail transit signal system - Google Patents
Universal frequency shift keying signal test system for rail transit signal system Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
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- H—ELECTRICITY
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Abstract
The invention relates to a universal frequency shift keying signal testing system for a rail transit signal system, which comprises a signal source, a frequency shift signal sending unit, a signal transmission path, a signal receiving unit, a receiving end and an upper computer man-machine interaction unit, wherein the signal source, the frequency shift signal sending unit, the signal transmission path, the signal receiving unit, the receiving end and the upper computer man-machine interaction unit are sequentially connected. Compared with the prior art, the invention has the advantages of supporting various coding modes, having corresponding decoding capability, coping with the test of various frequency shift keying signals and the like.
Description
Technical Field
The invention relates to the technical field of signal testing, in particular to a universal frequency shift keying signal testing system for a rail transit signal system.
Background
The field of rail transit signal systems mainly applies Frequency Shift Keying (FSK) technology to systems such as digital coding rails, axle counting, beacon antennas and the like. The frequency shift track circuit takes the frequency parameter as control information, and utilizes signal modulation to shift the low-frequency signal modulation to a higher frequency, but keeps the amplitude of the low-frequency signal constant, and the frequency changes along with the change of the amplitude of the low-frequency signal. The frequency shift track circuit can transmit running information (such as running speed, detailed line parameters and the like) while realizing automatic block of the interval, and provides required related information for train running control. In the circuit of China, the domestic 18 information frequency shift automatic block system and the UM-71 uninsulated track circuit both adopt frequency shift keying signals with continuous phases.
Through search, a chinese patent publication No. CN106124839A discloses a portable detector for track frequency shift signals and a detection method thereof. The detector consists of a magnetoresistive sensor, a temperature sensor, a signal conditioning unit, an analog-to-digital conversion unit, a DSP microprocessor, a WIFI communication unit, an LCD display unit and a power supply unit; the detection method is formed by detecting the effective value of the frequency shift current and the frequency of the frequency shift current in the rail by the magnetic resistance sensing unit, and the inconvenience of detecting the frequency shift signal at a lead wire is eliminated. But the scene used by the invention is the field rapid detection, and the invention is characterized by small size and portability, and needs to coordinate a remote code sending end when in use.
Through retrieval, digital coding non-insulation track circuits used by urban rail transit varieties in China currently include AF-902/904 (Shanghai No. 2), FTGS audio track circuits, ZPW-2000A, UM71 and the like. Various systems are different in carrier frequency, frequency offset, coding bit mode and the like, and the situation of coexistence of various systems will continue in the long run, but a set of universal test platform is not available at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a universal frequency shift keying signal test system for a rail transit signal system, aiming at the existing frequency shift keying signals of various systems, the hardware of the test system can be reused, and the modulation and demodulation algorithm software can be flexibly configured, supports various coding modes and has corresponding decoding capability so as to be suitable for testing various frequency shift keying signals.
The purpose of the invention can be realized by the following technical scheme:
a universal frequency shift keying signal test system for a rail transit signal system comprises a signal source, a frequency shift signal sending unit, a signal transmission path, a signal receiving unit, a receiving end and an upper computer man-machine interaction unit, wherein the signal source, the frequency shift signal sending unit, the signal transmission path, the signal receiving unit, the receiving end and the upper computer man-machine interaction unit are sequentially connected.
Preferably, the signal source comprises a PXI case and an arbitrary waveform generator board card installed on the PXI case;
the arbitrary waveform generator board card generates complex signals with specific frequency, and the complex signals are used for simulating the actual waveform of the track circuit when a train runs.
Preferably, the arbitrary waveform generator board card adopts NI PXI-5422, Kunzhi QT1237 or Linghua PXI 1117;
the signal source is also provided with an upper computer interface for providing a waveform parameter setting input frame, and parameters of a required baseband frequency, a carrier frequency, a modulation mode, coding information and a transmission path model are selected in an application range according to test items;
the signal source supports predefined high-frequency carrier frequencies of 1700Hz, 2KHz, 2300Hz and 2600Hz, and also supports user-defined selection within the board card capability range;
the signal source predefining supports low-frequency baseband signal frequency, the tolerance is 1.1Hz, the frequency deviation delta f is 11.0Hz from 10.3Hz to 29.0Hz according to an arithmetic progression, and self-defined selection in the board card capability range is also supported.
Preferably, the test system further comprises a noise source connected to the frequency shift signal sending unit, wherein the noise source comprises power frequency interference, white noise or gaussian noise.
Preferably, the Frequency Shift signal sending unit includes a signal modulation and analog signal generation circuit, and the signal modulation and analog signal generation circuit supports multiple Frequency Shift keying modulations, including BFSK (Binary Frequency Shift Key), MSK (minimum Shift Key);
the frequency shift signal sending unit supports various information coding protocols, comprises an 8-bit header, 37-bit data information and 16-bit cyclic check bits, and supports different coding lengths;
the carrier frequency of the frequency shift signal sending unit covers the carrier frequency used in the field of rail transit signals, supports 18 types of defined low-frequency information of the rail circuit, and supports user-defined low-frequency information.
Preferably, the signal transmission path comprises a plurality of tuning sections, and each tuning section comprises a transmitting tuning unit of the track section, an air coil and a receiving tuning unit of the next adjacent track section.
Preferably, the signal transmission path selects an actual transmission medium or a transmission path simulation model.
Preferably, the signal receiving unit includes an analog signal isolation conditioning unit, an analog signal sampling transmission and storage unit, which are connected in sequence.
Preferably, the receiving end collects the original data signal and converts the original data signal into a binary data stream disk for storage, and uses the stored original data as a data source, selects different algorithms for demodulation and decoding, and further judges the lower baseband recovery index and the error rate index of each algorithm.
Preferably, the upper computer human-computer interaction unit is used for providing waveform observation, characteristic value calculation, demodulation algorithm selection, decoding information flow and error rate calculation.
Compared with the prior art, the invention has the following advantages:
1) one set of hardware equipment is reused, so that the cost is saved;
2) different demodulation algorithms use the same data set, the performance index contrast is credible, and the method can be used for judging the accuracy and consistency of message data and judging the safety information occupied by intervals.
3) For transmission links with the same characteristics, the advantages and disadvantages of different modulation modes are researched, and the feasibility of sending more detailed line information is researched.
4) The method is suitable for testing required by new method verification and function improvement, and can be used for researching and developing new functions of the insulated rail. As in the Shanghai No. 2 line reconstruction project, the system provides a simulation test device for testing an AF-904 track circuit and provides a simulation test device for a next generation of urban signal system.
5) The method is suitable for parameter performance tests of transponders, frequency shift track circuits and the like, such as energy threshold requirements, parameter tuning of carrier modulation modes, effect comparison of different modulation modes, signal-to-noise ratio, frequency offset and bit error rate comparison.
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FIG. 1 is a diagram of the hardware configuration of the present invention;
FIG. 2 is a functional diagram of modules in accordance with an embodiment of the present invention;
fig. 3 is a flow chart of the operation of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
As shown in fig. 1, a universal frequency shift keying signal testing system for a rail transit signal system includes a signal source 1, a frequency shift signal sending unit 2, a signal transmission path, a signal receiving unit 3, a receiving end 4 and an upper computer human-computer interaction unit 5, where the signal source 1, the frequency shift signal sending unit 2, the signal transmission path, the signal receiving unit 3, the receiving end 4 and the upper computer human-computer interaction unit 5 are connected in sequence.
The test system is built based on a PXI bus to complete analog signal generation and acquisition. The signal source comprises a PXI case and an arbitrary waveform generator board card arranged on the PXI case; the arbitrary waveform generator board card generates complex signals with specific frequency, and the complex signals are used for simulating the actual waveform of the track circuit when a train runs.
The arbitrary waveform generator board card adopts NI PXI-5422, Kunzhi QT1237 or Linghua PXI 1117; the signal source is also provided with an upper computer interface 7 for providing a waveform parameter setting input frame, and parameters of a required baseband frequency, a carrier frequency, a modulation mode, coding information and a transmission path model are selected within an application range according to test items;
the signal source supports predefined high-frequency carrier frequencies of 1700Hz, 2KHz, 2300Hz and 2600Hz, and also supports user-defined selection within the board card capability range;
the signal source predefining supports low-frequency baseband signal frequency, the tolerance is 1.1Hz, the frequency deviation delta f is 11.0Hz from 10.3Hz to 29.0Hz according to an arithmetic progression, and self-defined selection in the board card capability range is also supported.
When the simulation transmission path is used instead of the true transmission path, the sending end can be loaded with noise, and the test system further comprises a noise source 6 connected with the frequency shift signal sending unit, wherein the noise source comprises power frequency interference, white noise or Gaussian noise.
The Frequency Shift signal sending unit comprises a signal modulation and analog signal generation circuit, and the signal modulation and analog signal generation circuit supports multiple Frequency Shift keying modulations, including BFSK (Binary Frequency Shift Key), MSK (minimum Shift Key);
the frequency shift signal sending unit supports various information coding protocols, comprises an 8-bit header, 37-bit data information and 16-bit cyclic check bits, and supports different coding lengths;
the carrier frequency of the frequency shift signal sending unit covers the carrier frequency used in the field of rail transit signals, supports 18 types of defined low-frequency information of the rail circuit, and supports user-defined low-frequency information.
The signal transmission path comprises a plurality of tuning areas, and each tuning area comprises a transmitting tuning unit of the track section, an air coil and a receiving tuning unit of the next adjacent track section.
The signal transmission path selects an actual transmission medium or a transmission path simulation model. The selected orbit frequency shift transmission model assumes that an orbit transmission network is a circuit with uniformly distributed parameters, and the orbit transmission network is modeled and analyzed by using a uniform transmission theory.
The signal receiving unit comprises an analog signal isolation conditioning unit and an analog signal sampling transmission and storage unit which are sequentially connected.
The receiving end collects original data signals and converts the original data signals into binary data stream disks for storage, the stored original data are used as data sources, different algorithms are selected for demodulation and decoding, and then the baseband recovery indexes and the error rate indexes under the algorithms are judged.
And the upper computer man-machine interaction unit is used for providing waveform observation, characteristic value calculation, demodulation algorithm selection, decoding information flow and error rate calculation.
The receiving end is connected with a signal source or connected with an emulation transmission path unit; and monitoring the response waveform of the receiving end of the frequency shift track circuit in real time, and filtering and analyzing the response waveform. Analog signals are subjected to undersampled data acquisition, band-pass filtering and then are digitized by binary numbers and then are stored; since the FSK frequency shifted signal has typical narrowband signal characteristics, demodulation is performed using the Zoom-FFT algorithm.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Taking ZPW-2000 type track circuit as an example, the difference of indexes under the Zoom-FFT and common FFT demodulation method is researched:
setting a carrier frequency f of a certain section02600Hz, the frequency of the low frequency signal to be modulated is 13.6Hz, and the frequencies of the frequency shift signals in the track are 2589Hz and 2611 Hz. The frequency shift signals have 8 carrier frequencies and 14 low frequencies, and 144 possible combination modes are provided in total, and the combination modes are all in a test sequence and can be selected through the first upper computer 11. In addition, the first upper computer 11 can also select whether to load noise, select the noise type, set the noise attribute and the like. When a simulated transmission path is used, transmission path model parameters may also be selected on the first upper computer 11. The Zoom-FFT and the common FFT algorithm can be selectively loaded on the second upper computer 21, the acquired signals are demodulated in real time, and the quality of the two algorithms can be compared by observing the waveform on the virtual oscilloscope. In addition, stored waveform data can be loaded, Zoom-FFT and common FFT algorithms are selected to be loaded, the data set is demodulated off line, and virtual representation is observedThe waveform on the wave filter can compare the advantages and disadvantages of the two algorithms.
The simulation transmission path model selects different frequency shift track circuit transfer functions and parameters, and is more beneficial to research and test.
And analyzing and calculating parameters such as the carrier frequency, the modulation frequency, the frequency shift index, the frequency offset, the upper and lower edge frequencies and the like of the frequency shift signal, and calculating errors. Analyzing a peak value and an energy spectrum of the sample by using an FFT-RMS measurement mode; spectral leakage is prevented by adding a Hanning window.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A universal frequency shift keying signal test system for a rail transit signal system is characterized by comprising a signal source, a frequency shift signal sending unit, a signal transmission path, a signal receiving unit, a signal receiving end and an upper computer man-machine interaction unit, wherein the signal source, the frequency shift signal sending unit, the signal transmission path, the signal receiving unit, the signal receiving end and the upper computer man-machine interaction unit are sequentially connected.
2. The system as claimed in claim 1, wherein the signal source includes a PXI chassis and an arbitrary waveform generator board card installed on the PXI chassis;
the arbitrary waveform generator board card generates complex signals with specific frequency, and the complex signals are used for simulating the actual waveform of the track circuit when a train runs.
3. The system for testing universal frequency shift keying signals for a rail transit signal system according to claim 1, wherein the arbitrary waveform generator board card employs NI PXI-5422, kunzhi QT1237 or linghua PXI 1117;
the signal source is also provided with an upper computer interface for providing a waveform parameter setting input frame, and parameters of a required baseband frequency, a carrier frequency, a modulation mode, coding information and a transmission path model are selected in an application range according to test items;
the signal source supports predefined high-frequency carrier frequencies of 1700Hz, 2KHz, 2300Hz and 2600Hz, and also supports user-defined selection within the board card capability range;
the signal source predefining supports low-frequency baseband signal frequency, the tolerance is 1.1Hz, the frequency deviation delta f is 11.0Hz from 10.3Hz to 29.0Hz according to an arithmetic progression, and self-defined selection in the board card capability range is also supported.
4. The system of claim 1, further comprising a noise source connected to the frequency shift signal transmitter, wherein the noise source comprises power frequency interference, white noise or Gaussian noise.
5. The system of claim 1, wherein the Frequency Shift signal transmitting unit comprises a signal modulation and analog signal generating circuit, and the signal modulation and analog signal generating circuit supports multiple Frequency Shift keying modulations including BFSK (Binary Frequency Shift Key), MSK (minimum Shift Key);
the frequency shift signal sending unit supports various information coding protocols, comprises an 8-bit header, 37-bit data information and 16-bit cyclic check bits, and supports different coding lengths;
the carrier frequency of the frequency shift signal sending unit covers the carrier frequency used in the field of rail transit signals, supports 18 types of defined low-frequency information of the rail circuit, and supports user-defined low-frequency information.
6. The system as claimed in claim 1, wherein the signal transmission path comprises a plurality of tuning sections, each tuning section comprising a transmitting tuning unit of the track section, an air coil, and a receiving tuning unit of the next adjacent track section.
7. The system according to claim 1 or 6, wherein the signal transmission path is selected from an actual transmission medium or a transmission path simulation model.
8. The system according to claim 1, wherein the signal receiving unit comprises an analog signal isolation conditioning unit, an analog signal sampling transmission and storage unit, which are connected in sequence.
9. The system according to claim 1, wherein the trusted terminal collects original data signals and converts the signals into binary data stream disk storage, and uses the stored original data as a data source, selects different algorithms to demodulate and decode, and further determines the baseband recovery index and the bit error rate index under each algorithm.
10. The system according to claim 1, wherein the upper computer human-computer interaction unit is configured to provide waveform observation, eigenvalue calculation, demodulation algorithm selection, decoded information stream, and bit error rate calculation.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104022835A (en) * | 2014-05-13 | 2014-09-03 | 北京交通大学 | Track circuit simulation system added with interference from neighboring line |
| CN109116142A (en) * | 2018-07-20 | 2019-01-01 | 固安信通信号技术股份有限公司 | The anti-interference emulation test method of track circuit receiver and system |
| CN209102815U (en) * | 2018-08-16 | 2019-07-12 | 北京铁路信号有限公司 | A kind of track circuit transmitter test device |
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- 2020-05-22 CN CN202010442345.8A patent/CN111600822A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104022835A (en) * | 2014-05-13 | 2014-09-03 | 北京交通大学 | Track circuit simulation system added with interference from neighboring line |
| CN109116142A (en) * | 2018-07-20 | 2019-01-01 | 固安信通信号技术股份有限公司 | The anti-interference emulation test method of track circuit receiver and system |
| CN209102815U (en) * | 2018-08-16 | 2019-07-12 | 北京铁路信号有限公司 | A kind of track circuit transmitter test device |
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