CN113141217B - Quick system of patrolling and examining of track traffic multifrequency wireless signal - Google Patents
Quick system of patrolling and examining of track traffic multifrequency wireless signal Download PDFInfo
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- CN113141217B CN113141217B CN202110261128.3A CN202110261128A CN113141217B CN 113141217 B CN113141217 B CN 113141217B CN 202110261128 A CN202110261128 A CN 202110261128A CN 113141217 B CN113141217 B CN 113141217B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- 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
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- 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
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- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention discloses a track traffic multi-frequency wireless signal rapid inspection system, and belongs to the field of track traffic communication. The system consists of a radio frequency processor, a controller and an upper computer. The radio frequency processor consists of a broadband digital demodulator, an interface module and a frequency mixer. The broadband digital demodulator is responsible for signal acquisition, AD conversion and data processing, an input signal is a radio frequency signal, and output data is frequency spectrum information. The frequency synthesizer provides a mixing signal for the broadband digital demodulator. The interface module is connected with the controller through a USB to receive instructions and send control information to the broadband digital demodulator and the frequency synthesizer, and meanwhile, the interface module receives signals of the broadband digital demodulator and sends the signals to the upper computer. The upper computer is connected with the controller through a network cable, receives the multi-frequency point signals, stores the frequency spectrum information and carries out further data processing. The method for multi-thread parallel work is used for completing the rapid inspection of the multi-band radio signals, and technical support is provided for monitoring the rail transit field intensity.
Description
Technical Field
The invention relates to a track traffic multi-frequency wireless signal rapid inspection system, and belongs to the field of track traffic communication.
Background
The rail transit wireless communication comprises a plurality of systems of private service communication and public service communication, and in order to ensure good coverage of wireless signals, the signals of a plurality of wireless frequency bands need to be regularly subjected to routing inspection along a line. Due to normal line operation during the day, patrol hours are typically limited at night. The currently adopted method is to adopt respective independent equipment to test the wireless signal field intensity for various different frequency bands, and the efficiency is very low. If the centralized equipment is adopted to test the field intensity of the wireless signal, the time for alternately detecting a plurality of frequency bands is slow in a general field intensity test method, and the requirement of small intervals on the test distance is difficult to meet under the condition that the inspection vehicle moves fast. Therefore, there is a great need to complete the polling of the multi-band radio signal by a fast method.
Disclosure of Invention
The invention aims to provide a track traffic multi-frequency wireless signal rapid inspection system aiming at the defects in the prior art, and the system can rapidly finish multi-frequency radio signal inspection.
To illustrate the present invention, the following assumptions are made:
1) The frequency of the multi-frequency signal in the rail transit scene is set on a fixed frequency point.
2) The power of the normal signal is greater than-90 dBm.
3) The position interval of the test points should be less than a fixed value.
In order to achieve the purpose of the invention, the conception of the invention is as follows:
through reasonable time sequence distribution, all parts work in parallel, and multi-band wireless signals are rapidly inspected and uploaded to an upper computer.
According to the inventive concept, the invention adopts the following technical scheme:
a multi-frequency wireless signal rapid inspection system for rail transit comprises a radio frequency processor, a controller and an upper computer, wherein the radio frequency processor is connected with the upper computer through the controller; the hardware of the radio frequency processor mainly comprises an interface module, a frequency synthesizer and a broadband digital demodulator which are constructed by an FPGA.
Preferably, the broadband digital modem is responsible for signal acquisition, AD conversion and data processing, the input signal is a radio frequency signal, and the output data is frequency spectrum information. The frequency synthesizer provides a mixing signal for the wideband digital demodulator. The interface module is connected with the controller through a USB to receive instructions and send control information to the broadband digital demodulator and the frequency synthesizer, and meanwhile, the interface module receives signals of the broadband digital demodulator and sends the signals to the upper computer.
Preferably, the controller interface sets parameters of a starting frequency, a terminating frequency and a frequency resolution of hardware.
Preferably, the upper computer is connected with the controller through a network cable, receives the multi-frequency point signal, stores the frequency spectrum information and performs further data processing.
Preferably, in the wideband digital demodulator, the control of the acquisition of the multi-frequency signals is performed by a parallel multi-thread method, only signals of a single frequency band are received at each moment, a pair of radio frequency signals are demodulated by a thread, and the demodulation comprises setting a detection frequency, a demodulator bandwidth and a digital filter coefficient, and performing digital filtering calculation. The two-thread two-pair demodulated signal analog-to-digital conversion comprises sampling, sample holding, segmented quantization and quantization coding, and the first thread and the second thread are simultaneously carried out, so that the rapid detection is ensured.
Preferably, in the interface module, the third thread issues local oscillation frequency commands required by different frequency band detection to the frequency synthesizer according to the frequency and bandwidth correspondence table and the clock sequence, the fourth thread receives digital signals sent by the broadband digital demodulator, adds a timestamp, outputs a UDP sequence to communicate with the control machine, and the third thread and the fourth thread are performed simultaneously, so that rapid detection is ensured.
Preferably, the controller is connected with the radio frequency processor through a USB, and sends a control instruction to the radio frequency processor, and receives spectrum information at the same time. The upper computer is connected with the controller through a network cable, receives the frequency spectrum information and carries out signal peak value detection and signal arrangement and warehousing. The control machine and the upper computer execute programs in parallel, and the two tasks ensure quick detection.
Preferably, the control machine starts and sets parameters: the method comprises the steps that a PC is started by a computer, and a program uses default starting frequency, end frequency, frequency resolution and low-noise amplifier to carry out frequency detection; parameters can be set according to requirements; the measurement can be started again after changing the parameters.
Preferably, the radio frequency processor test procedure: and after the test is started, scanning is started for a plurality of frequency bands to obtain the signal field intensity, and the signal field intensity is circularly acquired without intervals.
Preferably, the statistical analysis process of the upper computer result is as follows: the collected multiple field intensity values in each group are stored and analyzed, and the data storage function can store the collected data in a local txt file according to groups, wherein the file name is collected information. The collected frequency point field intensity data can be transmitted to an upper computer data processing terminal by using a UDP transmission protocol through a transmission function, and a frequency point field intensity graph is drawn, so that the frequency information of the signal is clear and visible.
Compared with the prior art, the invention has the following obvious prominent characteristics and remarkable advantages:
1. the invention adopts the centralized equipment to test the field intensity of the wireless signal, meets the requirement of small interval on the test distance under the condition that the inspection vehicle moves quickly, and finishes the inspection of the multi-band wireless signal by using a multi-thread parallel quick method;
2. the system comprises a human-computer interaction user interface and a data processing terminal, can specify parameters such as a scanning frequency range, a sampling frequency and a low-noise amplifier, can load and store the set parameters, and can display a spectrogram of collected field intensity data in real time by an upper computer.
Drawings
Fig. 1 is a block diagram of the architecture of the system of the present invention.
Fig. 2 is a thread diagram of the data interaction process of the rf processor of the present invention.
FIG. 3 is a flow chart of the control engine data processing procedure of the present invention.
FIG. 4 is a flow chart of the host computer data processing process of the present invention.
Detailed Description
The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings:
the first embodiment is as follows:
referring to fig. 1, a track traffic multifrequency wireless signal system of patrolling and examining fast comprises radio frequency processor 1, control machine 2 and 3 tripless of host computer, its characterized in that: the radio frequency processor 1 is connected with an upper computer 3 through a control machine 2; the radio frequency processor 1 is composed of a broadband digital demodulator 1-1, an interface module 1-3 and a frequency synthesizer 1-2.
The track traffic multi-frequency wireless signal rapid inspection system can rapidly complete multi-frequency radio signal inspection.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
the radio frequency processor 1 consists of a broadband digital demodulator 1-1, an interface module 1-3 and a frequency synthesizer 1-2; in the broadband digital demodulator 1-1, a parallel multithreading method is adopted for controlling the acquisition of multi-frequency signals, only a signal of a single frequency band is received at each moment, a pair of radio frequency signals are demodulated by a thread, the detection frequency, the demodulator bandwidth and the digital filter coefficient are set, and digital filtering calculation is carried out; the two-thread two-pair demodulated signal analog-to-digital conversion comprises sampling, sample holding, segmented quantization and quantization coding, and the first thread and the second thread are simultaneously carried out, so that the rapid detection is ensured.
In the interface module 1-3, the third thread issues local oscillation frequency commands required by different frequency band detection to the frequency synthesizer according to the corresponding table of frequency and bandwidth and the clock sequence, the fourth thread receives digital signals sent by the broadband digital demodulator, adds a timestamp and outputs a UDP sequence to communicate with the control machine, and the third thread and the fourth thread are performed simultaneously, so that rapid detection is ensured.
The controller 2 is connected with the radio frequency processor 1-2 through a USB (universal serial bus), sends a control instruction to the controller and receives frequency spectrum information at the same time; the upper computer 3 is connected with the control machine 2 through a network cable, receives the frequency spectrum information, and performs signal peak value detection and signal arrangement warehousing; the control machine 2 and the upper computer 3 execute in parallel, and the two tasks ensure quick detection.
In the embodiment, the field intensity of the wireless signal is tested by adopting centralized equipment, the requirement of small interval on the testing distance is met under the condition that the inspection vehicle moves quickly, and the multi-band wireless signal inspection is completed by using a multi-thread parallel quick method; the system comprises a human-computer interaction user interface and a data processing terminal, parameters such as a scanning frequency range, a sampling frequency and a low-noise amplifier can be appointed, the set parameters can be loaded and stored, and an upper computer can display a spectrogram of collected field intensity data in real time.
Example three:
referring to fig. 1-4, the operation steps of the track traffic multi-frequency wireless signal fast inspection system are as follows:
1. starting a control machine and setting parameters:
1) The control machine is a self-starting PC on the computer, and the program uses default initial frequency, end frequency, frequency resolution and low-noise amplifier to carry out frequency detection;
2) Setting parameters according to requirements;
3) Saving the current configuration or loading a configuration file to set parameters;
4) Starting measurement again after changing parameters;
2. the test and data transmission process of the radio frequency processor comprises the following steps:
a. the radio frequency processor receives a radio frequency signal, the broadband digital demodulator executes a thread one, the radio frequency signal is demodulated, the detection frequency, the demodulator bandwidth and the digital filter coefficient are set, and digital filtering calculation is carried out; performing parallel execution on a thread II, performing analog-to-digital conversion on the demodulated signal, wherein the analog-to-digital conversion comprises sampling, sample holding, segmented quantization and quantization coding; the interface module executes a third thread, issues local oscillation frequency commands required by different frequency band detection to the frequency synthesizer according to a corresponding table of frequency and bandwidth and a clock sequence, receives digital signals sent by the broadband digital demodulator in parallel, adds a timestamp, and outputs a UDP sequence to communicate with a control machine;
b. whether a control machine program is in a measuring state is detected, if so, the test is started, namely, a test command is sent to a radio frequency processor, the radio frequency processor starts to scan three frequency bands to acquire signal field intensity, and data are displayed in real time in a non-interval circulating collection manner;
c. after the step b is carried out, the controller temporarily stores the collected multiple field intensity values of each group, whether the field intensity values are in a storage state is detected through a detection program, if yes, the collected data are stored in a local txt file according to the groups, and the file name is collected information;
3. the statistical analysis process of the upper computer results:
whether the program is in a transmission state or not can be detected, if so, the UDP transmission protocol is used for transmitting the acquired frequency point field intensity data to the upper computer data processing terminal, the frequency point field intensity graph is drawn, the frequency information of the signal is clear and visible, and the data is stored again.
Example four:
the present embodiment is basically the same as the third embodiment, and the features are as follows:
in the step 1) of the starting and parameter setting process of the control machine, the measured radio frequency processor and the control machine work when being powered on, the data acquisition starts immediately, the frequency point scanning detection of three frequency range is carried out according to the default setting parameters, and the data is displayed and stored in real time. The measurement may be stopped at the user interface.
In the step 2) and the step 3) of the starting and parameter setting process of the control machine, after the measurement is stopped, the parameters can be changed on a user interface to meet the requirements of different frequency band scanning detection in different scenes. The currently set parameters can be saved in a local xml file, and the file can be directly loaded when being used again, so that the configuration is completed. And after the setting is finished, the measurement is restarted. In the parameter setting process, the sampling frequency can adjust the accuracy of the sampling frequency point and the signal field intensity by changing the scanning frequency range. And according to the frequency point interval obtained by calculating the frequency range and the number of scanning points, the sampling frequency is ensured to be maximum under the condition that the sampling frequency is not greater than the frequency point interval, so that the acquisition speed is fastest and most accurate.
In the step b in the testing and data transmission process of the radio frequency processor, after the measurement is started, sampling scanning of three frequency bands is carried out according to the starting frequency point, the ending frequency point, the sampling rate and the low-noise amplification parameter displayed on the current interface, each group of frequency bands are uniformly scanned and collected with a plurality of frequency points, and the signal field intensity is recorded. Immediately after one group is collected, the next group is collected until the user manually stops the measurement.
In step c of the test and data transmission process of the radio frequency processor, when the radio frequency processor is in a storage state, the field intensity values of the acquired data are stored in txt files according to groups, file names are represented by information and comprise acquisition time, frequency band numbers, sampling frequency, peak power and channel power, and the field intensity values can be checked and analyzed at any time after being offline.
In the statistical analysis process of the upper computer results, the control machine can send each group of collected data to the upper computer data processing terminal in real time in the measuring process, and the upper computer can select whether to communicate with the control machine, can receive the data in a transmission state and store the data. The upper computer terminal can display the spectrogram in a certain frequency band number frequency band range in real time and can also back up transmitted data to the local.
To sum up, the quick system of patrolling and examining of track traffic multifrequency radio signal of above-mentioned embodiment belongs to track traffic communication field. The system consists of a radio frequency processor, a controller and an upper computer. The radio frequency processor consists of a broadband digital demodulator, an interface module and a frequency mixer. The broadband digital demodulator is responsible for signal acquisition, AD conversion and data processing, an input signal is a radio frequency signal, and output data is frequency spectrum information. The frequency synthesizer provides a mixing signal for the wideband digital demodulator. The interface module is connected with the controller through a USB to receive instructions and send control information to the broadband digital demodulator and the frequency synthesizer, and meanwhile, the interface module receives signals of the broadband digital demodulator and sends the signals to the upper computer. The upper computer is connected with the controller through a network cable, receives the multi-frequency point signals, stores the frequency spectrum information and carries out further data processing. The method for multi-thread parallel work is used for completing the rapid inspection of the multi-band radio signals, and technical support is provided for monitoring the rail transit field intensity.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made according to the purpose of the invention, and all changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be made in the form of equivalent substitution, so long as the invention is in accordance with the purpose of the invention, and the invention shall fall within the protection scope of the present invention as long as the technical principle and the inventive concept of the present invention are not departed from the present invention.
Claims (2)
1. The utility model provides a track traffic multifrequency wireless signal system of patrolling and examining fast, comprises radio frequency processor (1), controller (2) and host computer (3) triplex, its characterized in that: the radio frequency processor (1) is connected with an upper computer (3) through a control machine (2); the radio frequency processor (1) consists of a broadband digital demodulator (1-1), an interface module (1-3) and a frequency synthesizer (1-2);
the operation steps of the track traffic multi-frequency wireless signal rapid inspection system are as follows:
starting a control machine and setting parameters:
1) The control machine is a self-starting PC on the computer, and the program uses default initial frequency, end frequency, frequency resolution and low-noise amplifier to carry out frequency detection;
2) Setting parameters according to requirements;
3) Saving the current configuration or loading a configuration file to set parameters;
4) Starting measurement again after changing parameters;
the testing and data transmission process of the radio frequency processor comprises the following steps:
a. the radio frequency processor receives a radio frequency signal, the broadband digital demodulator executes a thread one, the radio frequency signal is demodulated, the detection frequency, the demodulator bandwidth and the digital filter coefficient are set, and digital filtering calculation is carried out; performing parallel execution on a thread II, performing analog-to-digital conversion on the demodulated signal, wherein the analog-to-digital conversion comprises sampling, sample holding, segmented quantization and quantization coding; the interface module executes a thread three, issues local oscillation frequency commands required by different frequency band detection to the frequency synthesizer according to a corresponding table of frequency and bandwidth and a clock sequence, receives digital signals sent by the broadband digital demodulator, adds a timestamp, and outputs a UDP sequence to communicate with the controller;
b. whether a control machine program is in a measuring state is detected, if so, the test is started, namely, a test command is sent to a radio frequency processor, the radio frequency processor starts to scan three frequency bands to acquire signal field intensity, and data are displayed in real time in a non-interval circulating collection manner;
c. after the step b is carried out, the control machine temporarily stores the collected multiple field intensity values of each group, whether the field intensity values are in a storage state is detected, if yes, the collected data are stored in a local txt file according to the groups, and the file name is collected information;
the statistical analysis process of the upper computer results:
whether the program is in a transmission state can be detected through the detection program, if so, the collected frequency point field intensity data is transmitted to an upper computer data processing terminal through a UDP transmission protocol, a frequency point field intensity graph is drawn, the frequency information of the signal is clear and visible, and the data is stored again.
2. The track traffic multi-frequency wireless signal rapid inspection system according to claim 1, characterized in that: the controller (2) is connected with the radio frequency processor (1) through a USB (universal serial bus), sends a control instruction to the radio frequency processor (1), and receives frequency spectrum information; the upper computer (3) is connected with the controller (2) through a network cable, receives the frequency spectrum information, and performs signal peak value detection and signal arrangement and warehousing; the control machine (2) and the upper computer (3) execute programs in parallel, and rapid detection is ensured.
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