CN103092080A - 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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- CN103092080A CN103092080A CN2012105371403A CN201210537140A CN103092080A CN 103092080 A CN103092080 A CN 103092080A CN 2012105371403 A CN2012105371403 A CN 2012105371403A CN 201210537140 A CN201210537140 A CN 201210537140A CN 103092080 A CN103092080 A CN 103092080A
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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 track traffic technology, the communication technology, CBTC (Communication Based Train Control is based on the Train Control of communication) arises.CBTC and one of conventional rails traffic technique difference are exactly that the mode of data communication between train and ground is different.In the conventional rails traffic system, train adopts track circuit usually with communicating by letter of ground, namely by rail and wheel signal transmission; And in the CBTC system, train adopts 802.11 in present mobile communication technology with communicating by letter of ground, uses wireless mobile communication device (for example AP, Access Point, access point) to carry out the data communication on train and ground.These wireless mobile communication device are arranged on the line according to appointed interval, and the Wireless Communication Equipment that can communicate by letter is with it simultaneously installed ON TRAINS, so just can realize having communicated by letter between train and ground.Following Fig. 1.
Wireless signal easily is interfered, and its transmission performance is affected by environment larger, and the coverage property of identical equipment its wireless signal in varying environment is different, can cause performance difference.Particularly in the CBTC system, the diversity of city rail traffic route, the parameters such as tunnel-shaped, length, bending radius, span have caused the wireless signal overlay model more to be difficult to confirm.Therefore after the network equipment installs, need the work such as a large amount of tests, analysis, adjustment.
Existing wireless signal covers confirmation method: the first step, envelope test, AP is disposed in some positions in true tunnel, use analog machine (in the scope of 300 meters of front and back) (for example 3 meters) at a certain distance in its vicinity, carry out the cover butter of signal strength, record the received signal strength value in each collection point, snr value, each collection point should be tested 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 moves on actual track) checking envelope test data.
No matter be which kind of mode, testing crew is all for the monitoring wireless signal condition, monitors the vehicle-mounted network equipment and whether can normally, correctly carry out handover, the availability of monitoring wireless link.To data analysis, adjust wireless network parameter according to result after trapped state, again test, until whole network long-term stability satisfy the CBTC system to the requirement of cordless communication network.
Due to singularity, the requirement of integrated engineering project process and the plan of track traffic industry, want to use on-the-spot actual environment to carry out the experiment work of CBTC wireless signal, need through application, coordination.And disperse the service time of finally applying for, needs interting with other specialties to use.This plan to experiment work, arrangement, effect all can be influential.Long due to circuit, be at outside work again, therefore need to drop into a large amount of manpower and materials.Because the field intensity that will verify single AP covers, there is not the interference of the wireless signal of adjacent AP generation in envelope test, therefore can't checks that homogenous frequency signal is on the impact of transmission performance.
Summary of the invention
For the problem that prior art exists, one of purpose of the present invention is to provide the emulator of 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 that comprises above-mentioned emulator; A further object of the present invention is to provide a kind of emulation mode 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 the 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; The first controller is used for the business datum of the CBTC wireless signal data of reality is sent to AP by network, controls the programmable radio signal attenuator according to the signal parameter in the CBTC wireless signal data of reality simultaneously the emulation wireless signal of AP is decayed; The programmable radio signal attenuator is used for according to the control of the first controller, the emulation wireless signal that AP sends being decayed.
Further, the CBTC wireless signal data of described reality comprise noise signal, useful CBTC signal and co-channel interference signal.
Further, useful CBTC signal, the co-channel interference signal in the CBTC wireless signal data of described reality comprises following parameter: the device name of signal source, signal place channel; The relation function parameter that noise signal in the CBTC wireless signal data of described reality, useful CBTC signal and co-channel interference signal comprise signal strength and position.
Further, described CBTC wireless signal emulator comprises a plurality of AP, the wireless signal of a signal source of an AP emulation.
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, described Wireless Communication Equipment be used for the actual track traffic route on AP set up network and be connected, complete handover; Described second controller is used for gathering by Wireless Communication Equipment the comprehensive distribution situation of the true wireless signal of various Typical Route on the actual track traffic route, the CBTC wireless signal data of record collection; 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 comprise tunnel bend, tunnel switch area and platform zone.
CBTC wireless signal emulation mode of the present invention comprises the steps:
1) wireless signal canonical parameter on collection actual track traffic route;
2) signal strength that collects and the relation function data of position are converted to nothing able to programme
The pad value that the wire signal attenuation device uses and the relation function data of time;
3) according to the relation function data simulation CBTC wireless signal environment of pad value and time.
Further, the method that gathers wireless signal canonical parameter on the actual track traffic route in step 1) is specially: on typical segment, described CBTC wireless signal acquiring equipment is moved in the simulation train operation in rail line, control described Wireless Communication Equipment scanning 2.4GHz-2.4835GHz frequency range by second controller, gather all signals in this scope, and record the signal data that collects.
Further, the collection period of described CBTC wireless signal acquiring equipment is controlled at Millisecond.
Further, step 2) in, the relation function data of the signal strength that collects and position being converted to the pad value that the programmable radio signal attenuator uses is specially with the method for the relation function data of time: transform each AP emissive power, calculate each wireless signal pad value according to the AP emissive power of conversion and the wireless signal of collection.
Further, in step 3), the method for emulation CBTC wireless signal environment is specially: read the wireless signal acquiring data that convert by the first controller, information and the relation function of field intensity and time according to each signal, by described programmable radio signal attenuator, each signal is added upper pad value, and the emulation CBTC wireless signal environment of typical segment on the output track traffic route.
The present invention compared with prior art has following advantage:
1, greatly saved human cost.The process need that gathers adopts original test method, gather respectively CBTC wireless signal sample by two steps that illustrate in the background technology scheme, after collecting image data, just can test in testing laboratory according to the method in implementation, step.That is to say from the manpower angle to only have the manpower that need to use when gathering for the first time with in the past identical, the test that gathers after completing only needs 1 to 2 testing crew to complete, and Once you begin test, does not even participate in artificial.This has greatly saved human cost.
2. significantly reduced 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 be passed through coordinated time, interts and uses the actual track environment.CBTC wireless signal environmental simulation system has been arranged, only need to take actual environment in acquisition phase, gathered and just can test in testing laboratory after completing and reduced holding time to actual environment.
Description of drawings
Fig. 1 is the communication mode schematic diagram on train and ground in the 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 that gathers wireless signal canonical parameter step on the actual track traffic route in CBTC wireless signal emulation mode of the present invention;
Fig. 5 is converted to the pad value of signal and the process flow diagram of the relation function data step of time with the signal strength that collects and the relation function data of position in CBTC wireless signal emulation mode of the present invention;
Fig. 6 is according to the pad value of signal and the process flow diagram of 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 are used for explanation the present invention, but do not limit protection scope of the present 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 who is configured to network bridge mode, and second controller 12 is a notebook computer.Wireless Communication Equipment 11 be used for the actual track traffic route on AP set up network and be connected, complete handover; Second controller 12 is used for gathering by Wireless Communication Equipment 11 the comprehensive distribution situation of the true wireless signal of various Typical Route on the actual track traffic route, the CBTC wireless signal data that record gathers.On the actual track traffic route, various Typical Route comprise that tunnel bend, tunnel switch area and platform are regional.
As shown in Figure 3, CBTC wireless signal emulator, comprise AP 21, the first controller 22, Ethernet switch 23 and programmable radio signal attenuator 24, this example comprises a plurality of AP 21, be configured to access point mode, what of quantity can be adjusted according to actual needs, minimum two, many do not limit; The first controller 22 is a notebook computer.The first controller 22 and AP 21 are communicated with by Ethernet switch 23, and AP is for the wireless signal of each signal source of CBTC wireless signal data simulation of the reality that collects according to CBTC wireless signal acquiring equipment; The first controller 22 is used for the business datum of the CBTC wireless signal of reality is sent to AP 21 by network, decays according to the emulation wireless signal of 24 couples of AP 21 of the control programmable radio signal attenuator of the signal parameter in the CBTC wireless signal of reality simultaneously; The programmable radio signal attenuator can be decayed to wireless signal according to certain rule, program (as " pad value/time " function after conversion), the field intensity of signal is reduced, and programmable radio signal attenuator 24 is used for according to the control of the first controller, the emulation wireless signal that AP sends being decayed.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) gather wireless signal canonical parameter under true environment.
Use collecting device, connect hardware device with reference to gatherer process hardware connection layout in Fig. 2.Simulation train operation mobile collection equipment such as (tunnel bend, tunnel switch area, platform zone) in rail line on typical segment, control Wireless Communication Equipment 11 scanning 2.4GHz-2.4835GHz frequency ranges by second controller 12, gather all signals in this scope, comprise device name, the signal place channel of signal source, 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.
Because the field intensity-function of position of the wireless signal of reality is the continuous of simulation, and through becoming the discrete of numeral after acquisition process, according to sampling thheorem, consider requirement and the acquisition system actual performance of degree of distortion when reducing for wireless signal, collection period should be controlled at Millisecond.
After collection is completed, with the acquired data storage file, flow process is referring to Fig. 4.
2) the relation function data of the signal strength that collects and position are converted to pad value that the programmable radio signal attenuator uses and the relation function data of time.The data that are used for gathering are converted into the data that the programmable radio signal attenuator can be used.Concrete grammar is: 1, transform AP 21 emissive powers, and for example the emissive power of AP 21 is 30mW, is 10*lg (30) dBm=14.77dBm according to its dBm value of formula; 2, calculate pad value, certain signal that for example collects is :-64dBm/10240 rice, the AP emissive power is 14.77dBm, therefore pad value is: 14.77-(64) dBm=78.77dBm, and train speed is 10 meter per seconds, the data that therefore transformed are: 78.77dBm/1024 second.Flow process is referring to Fig. 5.
3) emulation wireless signal environment
Use emulator, connect hardware device with reference to simulation process hardware connection layout 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 each signal source that collects of emulation (comprising useful signal, noise, co-channel interference etc.).Make the normal transmitted signal of AP, and the less radio-frequency port of each AP is connected to the input end of programmable radio signal attenuator.
Read the wireless signal data that collect by the first controller 22, information and pad value and time relationship function according to each signal, use the programmable radio signal attenuator that each signal is decayed according to pad value and time relationship function, like this, at the CBTC wireless signal environment that is typical segment on the rail line that simulates (tunnel bend, tunnel switch area, platform zone etc.) of the output terminal of programmable radio signal attenuator output.Flow process is referring to Fig. 6.
Claims (10)
1. CBTC wireless signal emulator, it is characterized in that, comprise AP, the first controller and programmable radio signal attenuator, described the 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; The first controller is used for the business datum of the CBTC wireless signal data of reality is sent to AP by network, controls the programmable radio signal attenuator according to the signal parameter in the CBTC wireless signal data of reality simultaneously the emulation wireless signal of AP is decayed; The programmable radio signal attenuator is used for according to the control of the first controller, the emulation wireless signal that AP sends being decayed.
2. CBTC wireless signal emulator according to claim 1, is characterized in that, the CBTC wireless signal data of described reality comprise noise signal, useful CBTC signal and co-channel interference signal.
3. CBTC wireless signal emulator according to claim 2, is characterized in that, useful CBTC signal, co-channel interference signal in the CBTC wireless signal data of described reality comprise following parameter: the device name of signal source, signal place channel; The relation function parameter that noise signal in the CBTC wireless signal data of described reality, useful CBTC signal and co-channel interference signal comprise signal strength and position.
4. according to claim 1-3 described CBTC wireless signal of any one emulators, is characterized in that, described CBTC wireless signal emulator comprises a plurality of AP, the wireless signal of a signal source of an AP emulation.
5. CBTC wireless signal analogue system, it is characterized in that, comprise as CBTC wireless signal emulator and CBTC wireless signal acquiring equipment as described in claim 1-4 any one, described CBTC wireless signal acquiring equipment comprises Wireless Communication Equipment and second controller, described Wireless Communication Equipment be used for the actual track traffic route on AP set up network and be connected, complete handover; Described second controller is used for gathering by Wireless Communication Equipment the comprehensive distribution situation of the true wireless signal of various Typical Route on the actual track traffic route, the CBTC wireless signal data of record collection; Described real CBTC wireless signal data are the CBTC wireless signal data that second controller gathers.
6. CBTC wireless signal analogue system according to claim 5, is characterized in that, on described actual track traffic route, various Typical Route comprise tunnel bend, tunnel switch area and platform zone.
7. employing CBTC wireless signal as described in claim 5 or 6 analogue system emulation mode to the CBTC wireless signal, is characterized in that, comprises the steps:
1) wireless signal canonical parameter on collection actual track traffic route;
2) signal strength that collects and the relation function data of 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.
8. the emulation mode of CBTC wireless signal according to claim 7, it is characterized in that, the method that gathers wireless signal canonical parameter on the actual track traffic route in step 1) is specially: on typical segment, described CBTC wireless signal acquiring equipment is moved in the simulation train operation in rail line, control described Wireless Communication Equipment scanning 2.4GHz-2.4835GHz frequency range by second controller, gather all signals in this scope, and record the signal data that collects.
9. the emulation mode of CBTC wireless signal according to claim 7, it is characterized in that, step 2) in, the relation function data of the signal strength that collects and position are converted to the pad value of signal and the method for the relation function data of time is specially: transform each AP emissive power, calculate each wireless signal pad value according to the AP emissive power that transforms and the wireless signal of collection.
10. the emulation mode of CBTC wireless signal according to claim 7, it is characterized in that, in step 3), the method for emulation CBTC wireless signal environment is specially: read the wireless signal acquiring data that convert by the first controller, information and the relation function of field intensity and time according to each signal, control the variation of each signal by described programmable radio signal attenuator, and the emulation CBTC wireless signal environment of typical segment on the output track traffic route.
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| 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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