CN103092080B - Communications Based Train Control (CBTC) signal simulation device, simulation system and simulation method - Google Patents
Communications Based Train Control (CBTC) signal simulation device, simulation system and simulation method Download PDFInfo
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- CN103092080B CN103092080B CN201210537140.3A CN201210537140A CN103092080B CN 103092080 B CN103092080 B CN 103092080B CN 201210537140 A CN201210537140 A CN 201210537140A CN 103092080 B CN103092080 B CN 103092080B
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Abstract
The invention discloses a Communications Based Train Control (CBTC) signal simulation device, a simulation system and a simulation method. The simulation system comprises the CBTC wireless signal simulation device and the CBTC wireless signal collecting device, the CBTC wireless signal collecting device comprises a wireless network device and a second control device, the wireless network device is used for building network connection with a arithmetic processor (AP) on a real rail transit line and completing the handover, the second control device is used for collecting the general distribution situation of the real wireless signals of various typical lines on the real rail transit line through the wireless network device and recording the collected CBTC wireless signal data, and a programmable wireless signal attenuator is used for simulating the CBTC wireless signals according to the collected CBTC wireless signals data. The CBTC signal simulation device, the simulation system and the simulation method greatly save the manual experimental cost, and greatly reduce the holding time to the real CBTC wireless signal environment.
Description
Technical field
The present invention relates to wireless signal analogue system and emulation mode, espespecially a kind of CBTC wireless signal analogue system and emulation mode.
Background technology
Along with the development of technology of track traffic, the communication technology, CBTC (Communication Based Train Control, communication-based train control) arises.CBTC and one of conventional rails traffic technique difference be exactly between train and ground the mode of data communication different.In conventional rails traffic system, the communication on train and ground adopts track circuit usually, namely by rail and wheel signal transmission; And the communication on train and ground adopts in present mobile communication technology 802.11 in CBTC system, wireless mobile communication device (such as AP, Access Point, access point) is used to carry out the data communication on train and ground.These wireless mobile communication device arranged on the line according to appointed interval, the Wireless Communication Equipment that simultaneously can communicate with it is installed ON TRAINS, this makes it possible to realize the communication between train and ground.Following Fig. 1.
Wireless signal is easily interfered, and its transmission performance is affected by environment comparatively large, and the coverage property of identical equipment its wireless signal is in different environments different, can cause performance difference.Particularly in CBTC system, the diversity of city rail traffic route, the parameters such as tunnel-shaped, length, bending radius, span result in wireless signal overlay model and are more difficult to confirm.Therefore, after the network equipment installs, the work such as a large amount of tests, analysis, adjustment are needed.
Existing wireless signal covers confirmation method: the first step, envelope test, in true tunnel, AP is disposed in some positions, (within the scope of 300 meters, front and back) at a certain distance (such as 3 meters) in its vicinity to use analog machine, carry out the cover butter of signal strength, record the signal strength value received by each collection point, snr value, each collection point should test 1 minute, average, finally tentatively determine the layout points position of adjacent AP according to the distribution of field intensity; Second step, motor-car (train runs on actual track) checking envelope test data.
No matter be which kind of mode, testing crew is all in order to monitoring wireless signal condition, monitors the vehicle-mounted network equipment and whether normally, correctly can carry out handover, the availability of monitoring wireless link.To data analysis after trapped state, according to result adjustment wireless network parameter, again test, until whole network long-term stability meet the requirement of CBTC system to cordless communication network.
Because the singularity of track traffic industry, integrated engineering project process require and plan, want to use on-the-spot actual environment to carry out the experiment work of CBTC wireless signal, need through application, coordinate.And the service time of finally applying for is dispersion, need to be interspersed with use with other specialties.This plan on experiment work, arrangement, effect all can have impact.Because circuit is longer, be again at outside work, therefore need to drop into a large amount of manpower and materials.Due to the Field strength coverage of single AP will be verified in envelope test, there is not the interference of the wireless signal that adjacent AP produces, therefore cannot check the impact of homogenous frequency signal on transmission performance.
Summary of the invention
For prior art Problems existing, an object of the present invention is the emulator providing CBTC system wireless signal on a kind of analog orbit traffic route; Another object of the present invention is to provide a kind of analogue system comprising above-mentioned emulator; Another object of the present invention is the emulation mode providing a kind of above-mentioned analogue system.
For achieving the above object, CBTC wireless signal emulator of the present invention, comprise AP, the first controller and programmable radio signal attenuator, described first controller and AP are by network-in-dialing, and AP is used for the wireless signal according to each signal source of CBTC wireless signal data simulation of reality; First controller is used for the business datum in the CBTC wireless signal data of reality to send to AP by network, controls the emulation wireless signal of programmable radio signal attenuator to AP simultaneously decay according to the signal parameter in the CBTC wireless signal data of reality; Programmable radio signal attenuator is used for decaying to the emulation wireless signal that AP sends according to the control of the first controller.
Further, the CBTC wireless signal data of described reality comprise noise signal, useful CBTC signal and co-channel interference signal.
Further, the useful CBTC signal in the CBTC wireless signal data of described reality, co-channel interference signal comprise following parameter: the device name of signal source, signal place channel; Noise signal in the CBTC wireless signal data of described reality, useful CBTC signal and co-channel interference signal comprise the relation function parameter of signal strength and position.
Further, described CBTC wireless signal emulator comprises multiple AP, and an AP emulates the wireless signal of a signal source.
CBTC wireless signal analogue system of the present invention, comprise described CBTC wireless signal emulator and CBTC wireless signal acquiring equipment, described CBTC wireless signal acquiring equipment comprises Wireless Communication Equipment and second controller, and described Wireless Communication Equipment is connected for setting up network with the AP on actual track traffic route, completes handover; Described second controller is for gathering the comprehensive distribution situation of the true wireless signal of various Typical Route on actual track traffic route, the CBTC wireless signal data that record gathers by Wireless Communication Equipment; Described real CBTC wireless signal data are the CBTC wireless signal data that second controller gathers.
Further, on described actual track traffic route, various Typical Route comprises tunnel bend, tunnel switch area and platform region.
CBTC wireless signal emulation mode of the present invention, comprises the steps:
1) wireless signal canonical parameter on actual track traffic route is gathered;
2) the relation function data of the signal strength collected and position are converted to pad value and the relation function data of time that programmable radio signal attenuator uses;
3) according to pad value and the relation function data simulation CBTC wireless signal environment of time.
Further, step 1) in gather the method for wireless signal canonical parameter on actual track traffic route and be specially: typical segment is simulated train operation in rail line and moves described CBTC wireless signal acquiring equipment, control described Wireless Communication Equipment by second controller and scan 2.4GHz-2.4835GHz frequency range, gather all signals within the scope of this, and record the signal data collected.
Further, the collection period of described CBTC wireless signal acquiring equipment controls at Millisecond.
Further, step 2) in the relation function data of the signal strength collected and position are converted to pad value that programmable radio signal attenuator uses and the relation function data of time method be specially: transform each AP emissive power, the wireless signal according to the AP emissive power transformed and collection calculates each radio signal attenuation value.
Further, step 3) in the method for emulation CBTC wireless signal environment be specially: read the wireless signal acquiring data converted by the first controller, according to information and the relation function of field intensity and time of each signal, by described programmable radio signal attenuator, upper pad value is added to each signal, and the emulation CBTC wireless signal environment of typical segment on output track traffic route.
The present invention compared with prior art tool has the following advantages:
1, human cost has greatly been saved.The process need gathered adopts original test method, CBTC wireless signal sample is gathered respectively by two steps illustrated in background technology scheme, after collecting image data, just can test in testing laboratory according to the method in implementation, step.That is from manpower angle, need to use and manpower identical in the past when only having first time to gather, the test after having gathered only needs 1 to 2 testing crews to complete, and once test, does not even participate in artificial.This has greatly saved human cost.
2. significantly decrease the holding time to true CBTC wireless signal environment.Due to the singularity of track traffic industry, the schedule requirement of integrated engineering project, each specialty can only pass through coordinated time, interts and uses actual track environment.There is CBTC wireless signal environment analogue system, only needed to take actual environment in acquisition phase, just can carry out testing and decreasing the holding time to actual environment in testing laboratory after having gathered.
Accompanying drawing explanation
Fig. 1 is the communication mode schematic diagram on train and ground in CBTC system;
Fig. 2 is the structural representation of wireless signal acquiring equipment in CBTC wireless signal analogue system of the present invention;
Fig. 3 is the structural representation of wireless signal emulator in CBTC wireless signal analogue system of the present invention;
Fig. 4 is the process flow diagram gathering wireless signal canonical parameter step on actual track traffic route in CBTC wireless signal emulation mode of the present invention;
Fig. 5 is the process flow diagram in CBTC wireless signal emulation mode of the present invention, the relation function data of the signal strength collected and position being converted to the pad value of signal and the relation function data step of time;
Fig. 6 is the process flow diagram according to the pad value of signal and the relation function data simulation CBTC wireless signal environment step of time in CBTC wireless signal emulation mode of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but do not limit the scope of the invention.
CBTC wireless signal analogue system of the present invention, comprise CBTC wireless signal acquiring equipment and CBTC wireless signal emulator, as shown in Figure 2, CBTC wireless signal acquiring equipment comprises Wireless Communication Equipment 11 and second controller 12, in this example, Wireless Communication Equipment 11 is an AP being configured to network bridge mode, and second controller 12 is a notebook computer.Wireless Communication Equipment 11 is connected for setting up network with the AP on actual track traffic route, completes handover; Second controller 12, for being gathered the comprehensive distribution situation of the true wireless signal of various Typical Route on actual track traffic route by Wireless Communication Equipment 11, records the CBTC wireless signal data gathered.On actual track traffic route, various Typical Route comprises tunnel bend, tunnel switch area and platform region.
As shown in Figure 3, CBTC wireless signal emulator, comprise AP 21, first controller 22, Ethernet switch 23 and programmable radio signal attenuator 24, this example comprises multiple AP 21, be configured to access point mode, the number of quantity can adjust according to actual needs, minimum two, many does not limit; First controller 22 is a notebook computer.First controller 22 is communicated with by Ethernet switch 23 with AP 21, and AP is used for the wireless signal of each signal source of CBTC wireless signal data simulation of the reality collected according to CBTC wireless signal acquiring equipment; First controller 22, for the business datum in the CBTC wireless signal of reality is sent to AP 21 by network, is decayed according to the emulation wireless signal of the signal parameter control programmable radio signal attenuator 24 couples of AP 21 in the CBTC wireless signal of reality simultaneously; Programmable radio signal attenuator can be decayed to wireless signal according to certain rule, program (" pad value/time " function as after conversion), the field intensity of signal is reduced, and programmable radio signal attenuator 24 is decayed to the emulation wireless signal that AP sends for the control according to the first controller.The less radio-frequency port of each AP 21 is connected to the input end of programmable radio signal attenuator 24.
CBTC wireless signal emulation mode of the present invention, comprises the steps:
1) wireless signal canonical parameter under collection true environment.
Use collecting device, connect hardware device with reference to gatherer process signal wiring figure in Fig. 2.(tunnel bend, tunnel switch area, platform region etc.) simulation train operation mobile collection equipment in typical segment in rail line, control Wireless Communication Equipment 11 by second controller 12 and scan 2.4GHz-2.4835GHz frequency range, gather all signals within the scope of this, comprise the device name of signal source, signal place channel, the field intensity of signal and the relation function of position.So just can effectively collect in this section, the situation of signal, noise, co-channel interference.
Field intensity-function of position due to the wireless signal of reality is the continuous print of simulation, and after acquisition process, become the discrete of numeral, according to sampling thheorem, consider requirement and the acquisition system actual performance of degree of distortion when reducing for wireless signal, collection period should control at Millisecond.
By acquired data storage file after collection completes, flow process is see Fig. 4.
2) the relation function data of the signal strength collected and position are converted to pad value and the relation function data of time that programmable radio signal attenuator uses.Be used for by the data transformations of collection be programmable radio signal attenuator can data.Concrete grammar is: 1, and transform AP 21 emissive power, the emissive power of such as AP 21 is 30mW, is 10*lg (30) dBm=14.77dBm according to its dBm value of formula; 2, calculate pad value, certain signal such as collected is :-64dBm/10240 rice, AP emissive power is 14.77dBm, therefore pad value is: 14.77-(-64) dBm=78.77dBm, and train speed is 10 meter per seconds, and the data therefore transformed are: 78.77dBm/1024 second.Flow process is see Fig. 5.
3) wireless signal environment is emulated
Use emulator, connect hardware device with reference to simulation process signal wiring figure in Fig. 3.
Configure the configuration information of all AP 21, comprise emissive power, channel etc., make it identical with actual environment, each AP is used for emulating each signal source collected (comprising useful signal, noise, co-channel interference etc.).Make AP normally send signal, and the less radio-frequency port of each AP is connected to the input end of programmable radio signal attenuator.
The wireless signal data collected are read by the first controller 22, according to the information of each signal and pad value and time relationship function, programmable radio signal attenuator is used to decay according to pad value and time relationship function to each signal, like this, the CBTC wireless signal environment of typical segment (tunnel bend, tunnel switch area, platform region etc.) on the rail line simulated being of exporting of the output terminal of programmable radio signal attenuator.Flow process is see Fig. 6.
Claims (6)
1. a CBTC wireless signal analogue system, is characterized in that, comprises CBTC wireless signal emulator and CBTC wireless signal acquiring equipment;
Described CBTC wireless signal emulator comprises AP, the first controller and programmable radio signal attenuator, and described first controller and AP are by network-in-dialing, and AP is used for the wireless signal according to each signal source of CBTC wireless signal data simulation of reality; First controller is used for the business datum in the CBTC wireless signal data of reality to send to AP by network, controls the emulation wireless signal of programmable radio signal attenuator to AP simultaneously decay according to the signal parameter in the CBTC wireless signal data of reality; Programmable radio signal attenuator is used for decaying to the emulation wireless signal that AP sends according to the control of the first controller;
Wherein, the CBTC wireless signal data of described reality comprise noise signal, useful CBTC signal and co-channel interference signal;
Wherein, the useful CBTC signal in the CBTC wireless signal data of described reality, co-channel interference signal comprise following parameter: the device name of signal source, signal place channel; Noise signal in the CBTC wireless signal data of described reality, useful CBTC signal and co-channel interference signal comprise the relation function parameter of signal strength and position;
Wherein, described CBTC wireless signal emulator comprises multiple AP, and an AP emulates the wireless signal of a signal source;
Described CBTC wireless signal acquiring equipment comprises Wireless Communication Equipment and second controller, and described Wireless Communication Equipment is connected for setting up network with the AP on actual track traffic route, completes handover; Described second controller is for gathering the comprehensive distribution situation of the true wireless signal of various Typical Route on actual track traffic route, the CBTC wireless signal data that record gathers by Wireless Communication Equipment; Described real CBTC wireless signal data are the CBTC wireless signal data that second controller gathers.
2. CBTC wireless signal analogue system according to claim 1, is characterized in that, on described actual track traffic route, various Typical Route comprises tunnel bend, tunnel switch area and platform region.
3. adopt CBTC wireless signal analogue system as claimed in claim 1 or 2 to an emulation mode for CBTC wireless signal, it is characterized in that, comprise the steps:
1) wireless signal canonical parameter on actual track traffic route is gathered;
2) the relation function data of the signal strength collected and position are converted to the pad value of signal and the relation function data of time;
3) according to the pad value of signal and the relation function data simulation CBTC wireless signal environment of time.
4. the emulation mode of CBTC wireless signal according to claim 3, it is characterized in that, step 1) in gather the method for wireless signal canonical parameter on actual track traffic route and be specially: typical segment is simulated train operation in rail line and moves described CBTC wireless signal acquiring equipment, control described Wireless Communication Equipment by second controller and scan 2.4GHz-2.4835GHz frequency range, gather all signals within the scope of this, and record the signal data collected.
5. the emulation mode of CBTC wireless signal according to claim 3, it is characterized in that, step 2) in the relation function data of the signal strength collected and position are converted to the pad value of signal and the relation function data of time method be specially: transform each AP emissive power, the wireless signal according to the AP emissive power transformed and collection calculates each radio signal attenuation value.
6. the emulation mode of CBTC wireless signal according to claim 3, it is characterized in that, step 3) in the method for emulation CBTC wireless signal environment be specially: read the wireless signal acquiring data converted by the first controller, according to information and the relation function of field intensity and time of each signal, the change of each signal is controlled by described programmable radio signal attenuator, and the emulation CBTC wireless signal environment of typical segment on output track traffic route.
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| CN104883697B (en) * | 2015-04-20 | 2018-08-28 | 北京全路通信信号研究设计院集团有限公司 | A kind of vehicle-ground wireless communication simulation method and system |
| CN104849524A (en) * | 2015-05-19 | 2015-08-19 | 重庆大学 | Data acquisition system orienting high-power pulse signal and method thereof |
| CN107172650B (en) * | 2016-03-08 | 2022-03-25 | 中兴通讯股份有限公司 | Simulation method and system for large-scale complex wireless communication system |
| CN105912344A (en) * | 2016-05-03 | 2016-08-31 | 上海自仪泰雷兹交通自动化***有限公司 | Automatic generation system for deliverables required for deploying CBTC system |
| CN111510932A (en) * | 2020-03-21 | 2020-08-07 | 杭州迪普科技股份有限公司 | Wireless access point deployment method and device, electronic equipment and computer readable medium |
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