CN115208493B - Subway CBTC signal detection method, system and device based on handheld terminal - Google Patents
Subway CBTC signal detection method, system and device based on handheld terminal Download PDFInfo
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- CN115208493B CN115208493B CN202210716048.7A CN202210716048A CN115208493B CN 115208493 B CN115208493 B CN 115208493B CN 202210716048 A CN202210716048 A CN 202210716048A CN 115208493 B CN115208493 B CN 115208493B
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- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 230000006870 function Effects 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 11
- 238000001228 spectrum Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
-
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/3833—Hand-held transceivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C2201/00—Transmission systems of control signals via wireless link
- G08C2201/90—Additional features
- G08C2201/93—Remote control using other portable devices, e.g. mobile phone, PDA, laptop
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a subway CBTC signal detection method, a system and a device based on a handheld terminal, wherein the method comprises the following steps: acquiring CBTC wireless signals and converting the CBTC wireless signals to obtain baseband data; analyzing the baseband data according to the characteristics of the system to obtain original data; and responding to the acquired data message, cleaning and processing the original data, and displaying the processed data. The system comprises: the system comprises a radio frequency acquisition module, a baseband analysis module and a handheld terminal. The device comprises a memory and a processor for executing the subway CBTC signal detection method based on the handheld terminal. By using the method and the device, signal analysis and interference positioning can be realized, and interference and discovery problems can be timely checked. The subway CBTC signal detection method, system and device based on the handheld terminal and the storage medium can be widely applied to the field of signal monitoring.
Description
Technical Field
The application relates to the field of signal monitoring, in particular to a subway CBTC signal detection method, system and device based on a handheld terminal.
Background
The train automatic control system (Communication Based Train Control System) based on wireless communication is a center of a rail transit communication control system and is important for rail transit safety operation. The CBTC wireless signals mainly adopt 2.4G frequency bands and 1.8G frequency bands, wherein the 2.4G frequency bands are open frequency bands and are easily influenced by civil wireless communication equipment such as WiFi, bluetooth or unmanned aerial vehicles; meanwhile, the 1.8G frequency band is an industrial frequency band, is not special for subways, and is easy to be interfered by the adjacent frequency of the base station of an operator. The traditional test instrument for detecting the CBTC wireless signals of the subway is mainly a spectrum analyzer, only can display spectrum waveforms of wireless environments, can not analyze signals and locate interference, and can not timely check interference and find problems.
Disclosure of Invention
In order to solve the technical problems, the application aims to provide a subway CBTC signal detection method, a subway CBTC signal detection system and a subway CBTC signal detection device based on a handheld terminal, which can realize signal analysis and interference positioning and timely troubleshoot interference and discovery problems.
The first technical scheme adopted by the application is as follows: a subway CBTC signal detection method based on a handheld terminal comprises the following steps:
acquiring CBTC wireless signals and converting the CBTC wireless signals to obtain baseband data;
analyzing the baseband data according to the characteristics of the system to obtain original data;
and responding to the acquired data message, cleaning and processing the original data, and displaying the processed data.
Further, the step of acquiring and converting the CBTC wireless signal to obtain baseband data specifically includes:
according to the standard requirements of a wireless communication system, acquiring CBTC wireless signals according to a specific center frequency and a sampling rate;
performing conversion processing on the CBTC wireless signals to obtain baseband data;
and uploading and storing the baseband data.
Further, the step of analyzing the baseband data according to the characteristics of the system to obtain the original data specifically includes:
according to the characteristics of the system, frame synchronization is carried out on the baseband data, and the starting position of a wireless frame is determined;
performing channel estimation by using a pilot signal with a radio frame starting position as a reference to obtain a channel estimation result;
and demodulating and decoding the load data part in the baseband data according to the channel estimation result and the standard characteristic to obtain the original data.
Further, the calculation formula of the channel estimation is as follows:
in the above-mentioned method, the step of,representing channel estimation value, X * Represents the conjugate transpose of the matrix, X represents the transmitting-side pilot signal, and Y represents the received signal.
Further, the demodulation formula is expressed as follows:
in the above formula, I represents a unit array, sigma 2 Representing the channel noise average power, S representing the received signal.
Further, the step of cleaning and processing the original data and displaying the processed data in response to the collected data message specifically includes:
setting detection parameters and starting threads according to user needs;
the socket is started through a thread to connect with CBTC wireless signal analysis service and obtain original data;
sending the original data to a message queue through a thread callback function;
capturing original data based on a message queue processing program, and cleaning and processing the original data to obtain processed data;
and sending the processed data to a parent process for signal display based on the thread callback function.
Further, the cleaning and processing the raw data specifically includes:
performing Fourier transformation on an input signal in the original data to obtain spectrum data of the input signal;
and carrying out signal offset correction based on dynamic gain on the input signal in the original data to obtain corrected data.
The second technical scheme adopted by the application is as follows: subway CBTC signal detection system based on handheld terminal includes:
the radio frequency acquisition module is used for acquiring CBTC wireless signals according to a preset center frequency and a sampling rate and converting the CBTC wireless signals to obtain baseband data;
the baseband analyzing module is used for analyzing baseband data according to the characteristics of the system to obtain original data;
and the handheld terminal is used for responding to the acquired data information, cleaning and processing the original data and displaying the processed data.
The third technical scheme adopted by the application is as follows: subway CBTC signal detection device based on handheld terminal includes:
at least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement a handheld terminal-based subway CBTC signal detection method as described above.
The method, the system and the device have the beneficial effects that: according to the application, the radio frequency acquisition module is used for completing CBTC wireless signal measurement, the baseband analysis module is used for realizing signal analysis, and finally the handheld terminal APP software is used for displaying the detection result of the CBTC wireless signal, so that the spectrum scanning function of the spectrum analyzer can be realized, the signal analysis and interference positioning can be realized, and the interference and discovery problems can be timely checked, thereby overcoming the defects of the traditional spectrum analyzer of the test instrument.
Drawings
FIG. 1 is a flow chart of steps of a subway CBTC signal detection method based on a handheld terminal;
fig. 2 is a structural block diagram of a subway CBTC signal detection system based on a handheld terminal of the present application.
Detailed Description
The application will now be described in further detail with reference to the drawings and to specific examples. The step numbers in the following embodiments are set for convenience of illustration only, and the order between the steps is not limited in any way, and the execution order of the steps in the embodiments may be adaptively adjusted according to the understanding of those skilled in the art.
As shown in fig. 1, the application provides a subway CBTC signal detection method based on a handheld terminal, which comprises the following steps:
s1, acquiring CBTC wireless signals and converting the CBTC wireless signals to obtain baseband data;
s1.1, acquiring CBTC wireless signals according to the standard requirements of a wireless communication system and specific center frequency and sampling rate;
s1.2, converting CBTC wireless signals to obtain baseband data;
s1.3, uploading baseband data and storing.
Specifically, according to different wireless communication system standards, the wireless communication signals are converted into baseband data by a software radio hardware module according to specific center frequency and sampling rate, and the baseband data are stored in a local storage unit or transmitted to a remote storage unit through a network.
S2, analyzing the baseband data according to the characteristics of the system to obtain original data;
s2.1, according to the characteristics of a system, carrying out frame synchronization on baseband data, and determining the starting position of a wireless frame;
specifically, the supportable wireless communication system includes: 802.11 family and LTE-M.
S2.2, carrying out channel estimation by using a pilot signal by taking the starting position of the wireless frame as a reference to obtain a channel estimation result;
specifically, the method of channel estimation may employ a common algorithm, such as Least Squares (LS), and the calculation formula of the channel estimation is as follows:
in the above-mentioned method, the step of,representing channel estimation value, X * Represents the conjugate transpose of the matrix, X represents the transmitting-side pilot signal, and Y represents the received signal.
S2.3, demodulating and decoding the load data part in the baseband data according to the channel estimation result and the standard characteristic to obtain the original data.
The demodulation algorithm may adopt a classical MMSE algorithm, and assuming that the received signal is S in the data segment, the demodulation result of the data segment may be expressed as:
in the above formula, I represents a unit array, sigma 2 Representing the channel noise average power, S representing the received signal.
The decoding algorithm needs to select either classical viterbi decoding or iterative decoding algorithms according to the protocol specification.
Specifically, according to different standards of the CBTC, the stored baseband data is parsed. Firstly, according to the characteristics of different systems, frame synchronization is carried out on wireless baseband data, and the starting position of a wireless frame is determined; then, taking the initial position of the wireless frame as a reference, and utilizing a pilot signal or a synchronous signal to carry out channel estimation; and demodulating and decoding the load data part according to different standard standards according to the result of channel estimation, and recovering the original data.
And S3, responding to the acquired data information, cleaning and processing the original data, and displaying the processed data.
S3.1, setting detection parameters according to user needs and starting a thread;
specifically, starting an APP program of the handheld terminal, acquiring CBTC wireless signal detection setting parameters, initializing an interface, and starting related threads.
S3.2, starting socket connection CBTC wireless signal analysis service through threads and obtaining original data;
specifically, the thread starts socket connection CBTC wireless signal analysis service (ZeroMQ protocol), and monitors to acquire data at the port through a polling receiving method.
S3.3, sending the original data to a message queue through a thread callback function;
specifically, the collected data is sent to a message queue through a thread callback function.
S3.4, capturing original data based on the message queue processing program, and cleaning and processing the original data to obtain processed data;
specifically, after the message queue processing program captures the collected data message, the original data is cleaned and processed, including FFT, mirror image processing, interference filtering, AGC and other processes.
S3.4.1, performing Fourier transform on the input signal in the original data to obtain spectrum data of the input signal;
specifically, the formula is expressed as follows:
B＝FFT(Y[real]，Y[imag])
in the above formula, Y represents the input signal, Y [ real ] represents the real signal, and Y [ imag ] represents the imaginary signal.
S3.4.2, performing signal offset correction based on dynamic gain on the input signal in the original data to obtain corrected data.
Specifically, the formula is expressed as follows:
OUT[i]＝B[i]-AGC+OFFSET
in the above equation, AGC denotes the dynamic gain of data samples, OFFSET denotes the signal OFFSET, bi denotes the input signal, and OUT i denotes the input signal.
After the signal B [ i ] is corrected, the final signal OUT [ i ] is output.
And S3.5, sending the processed data to a parent process for signal display based on the thread callback function.
Specifically, the processed data is sent to a parent process (APP interface program) through a callback function for displaying the spectrum data and the decoded data.
S3.6, circulating the steps S3.1-S3.5, and acquiring and displaying data in real time.
Specifically, the APP program of the handheld terminal automatically and circularly repeats the steps, so that the real-time acquisition and display of the measurement data are ensured.
As shown in fig. 2, a subway CBTC signal detection system based on a handheld terminal includes:
the radio frequency acquisition module is used for acquiring CBTC wireless signals according to a preset center frequency and a sampling rate and converting the CBTC wireless signals to obtain baseband data;
the baseband analyzing module is used for analyzing baseband data according to the characteristics of the system to obtain original data;
and the handheld terminal is used for responding to the acquired data information, cleaning and processing the original data and displaying the processed data.
The content in the method embodiment is applicable to the system embodiment, the functions specifically realized by the system embodiment are the same as those of the method embodiment, and the achieved beneficial effects are the same as those of the method embodiment.
Subway CBTC signal detection device based on handheld terminal:
at least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement a handheld terminal-based subway CBTC signal detection method as described above.
The content in the method embodiment is applicable to the embodiment of the device, and the functions specifically realized by the embodiment of the device are the same as those of the method embodiment, and the obtained beneficial effects are the same as those of the method embodiment.
A storage medium having stored therein instructions executable by a processor, characterized by: the processor executable instructions when executed by the processor are for implementing a handheld terminal based subway CBTC signal detection method as described above.
The content in the method embodiment is applicable to the storage medium embodiment, and functions specifically implemented by the storage medium embodiment are the same as those of the method embodiment, and the achieved beneficial effects are the same as those of the method embodiment.
While the preferred embodiment of the present application has been described in detail, the application is not limited to the embodiment, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (5)
1. A subway CBTC signal detection method based on a handheld terminal is characterized by comprising the following steps:
acquiring CBTC wireless signals and converting the CBTC wireless signals to obtain baseband data;
analyzing the baseband data according to the characteristics of the system to obtain original data;
responding to the collected data information, cleaning and processing the original data, and displaying the processed data;
the step of acquiring and converting the CBTC wireless signals to obtain baseband data specifically comprises the following steps:
according to the standard requirements of a wireless communication system, acquiring CBTC wireless signals according to a specific center frequency and a sampling rate;
performing conversion processing on the CBTC wireless signals to obtain baseband data;
uploading baseband data and storing;
the step of analyzing the baseband data according to the characteristics of the system to obtain the original data specifically comprises the following steps:
according to the characteristics of the system, frame synchronization is carried out on the baseband data, and the starting position of a wireless frame is determined;
performing channel estimation by using a pilot signal with a radio frame starting position as a reference to obtain a channel estimation result;
demodulating and decoding a load data part in the baseband data according to the channel estimation result and the standard characteristic to obtain original data;
the calculation formula of the channel estimation is as follows:
in the above-mentioned method, the step of,representing channel estimation value, X * Representing the conjugate transpose of the matrix, X representing the transmitting end pilot signal, Y representing the receiving signal;
the step of cleaning and processing the original data and displaying the processed data in response to the collected data message specifically comprises the following steps:
setting detection parameters and starting threads according to user needs;
the socket is started through a thread to connect with CBTC wireless signal analysis service and obtain original data;
sending the original data to a message queue through a thread callback function;
capturing original data based on a message queue processing program, and cleaning and processing the original data to obtain processed data;
and sending the processed data to a parent process for signal display based on the thread callback function.
2. The method for detecting the CBTC signal of the subway based on the handheld terminal according to claim 1 wherein a demodulation formula is expressed as follows:
in the above formula, I represents a unit array, sigma 2 Representing the channel noise average power, S representing the received signal.
3. The subway CBTC signal detection method based on the handheld terminal according to claim 2, wherein said cleaning and processing the raw data specifically includes:
performing Fourier transformation on an input signal in the original data to obtain spectrum data of the input signal;
and carrying out signal offset correction based on dynamic gain on the input signal in the original data to obtain corrected data.
4. Subway CBTC signal detection system based on handheld terminal, its characterized in that includes:
the radio frequency acquisition module is used for acquiring CBTC wireless signals according to a preset center frequency and a sampling rate and converting the CBTC wireless signals to obtain baseband data;
the baseband analyzing module is used for analyzing baseband data according to the characteristics of the system to obtain original data;
the handheld terminal is used for responding to the acquired data information, cleaning and processing the original data and displaying the processed data;
the method for acquiring and converting the CBTC wireless signals to obtain baseband data specifically comprises the following steps: according to the standard requirements of a wireless communication system, acquiring CBTC wireless signals according to a specific center frequency and a sampling rate; performing conversion processing on the CBTC wireless signals to obtain baseband data; uploading baseband data and storing;
analyzing the baseband data according to the characteristics of the system to obtain the original data, wherein the method specifically comprises the following steps: according to the characteristics of the system, frame synchronization is carried out on the baseband data, and the starting position of a wireless frame is determined; performing channel estimation by using a pilot signal with a radio frame starting position as a reference to obtain a channel estimation result; demodulating and decoding a load data part in the baseband data according to the channel estimation result and the standard characteristic to obtain original data;
the calculation formula of the channel estimation is as follows:
in the above-mentioned method, the step of,representing channel estimation value, X * Representing the conjugate transpose of the matrix, X representing the transmitting end pilot signal, Y representing the receiving signal;
the method comprises the steps of responding to the collected data message, cleaning and processing the original data, and displaying the processed data, wherein the method specifically comprises the following steps: setting detection parameters and starting threads according to user needs; the socket is started through a thread to connect with CBTC wireless signal analysis service and obtain original data; sending the original data to a message queue through a thread callback function; capturing original data based on a message queue processing program, and cleaning and processing the original data to obtain processed data; and sending the processed data to a parent process for signal display based on the thread callback function.
5. Subway CBTC signal detection device based on handheld terminal, its characterized in that includes:
at least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement a handheld terminal-based subway CBTC signal detection method as recited in any one of claims 1-3.
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| US8228849B2 (en) * | 2002-07-15 | 2012-07-24 | Broadcom Corporation | Communication gateway supporting WLAN communications in multiple communication protocols and in multiple frequency bands |
| JP5080400B2 (en) * | 2008-08-25 | 2012-11-21 | 株式会社日立製作所 | Wireless terminal, base station, and channel characteristic estimation method |
| FR2938140B1 (en) * | 2008-10-31 | 2011-04-15 | St Microelectronics Sa | INTERFERENCE REMOVAL RECEIVER BETWEEN CARRIERS. |
| JP5358738B2 (en) * | 2011-05-18 | 2013-12-04 | パナソニック株式会社 | Receiving device, integrated circuit, receiving method, and program |
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| CN111970025A (en) * | 2020-06-28 | 2020-11-20 | 上海伽易信息技术有限公司 | Subway CBTC frequency hopping signal full-band synchronous differential detection method |
| CN114079516A (en) * | 2021-09-06 | 2022-02-22 | 中国民航大学 | DVOR air signal test analysis system based on unmanned aerial vehicle and ZYNQ |
| CN114390575A (en) * | 2022-01-24 | 2022-04-22 | 上海伽易信息技术有限公司 | Wireless signal synchronous detection method, system and device facing CBTC |
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