CN103236891B - System and method for testing dedicated short range communication (DSRC) equipment - Google Patents
System and method for testing dedicated short range communication (DSRC) equipment Download PDFInfo
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Abstract
The invention discloses a system and a method for testing dedicated short range communication (DSRC) equipment. The system comprises a testing computer, special testing equipment, a signal source and a microwave antenna, testing software is installed in the testing computer, the testing computer chooses test content and configure test parameters according to tested equipment and controls testing processes according to the test content and the text parameters, the special testing equipment generates DSRC test data under the control of the testing computer, receives response data returned by the tested equipment and sends the data after being analyzed to the testing computer, the signal source outputs the DSRC test data according to input data of the special testing equipment or programming instructions of the testing computer, the microwave antenna emits the DSRC test data provided by the special testing equipment or the signal source to the tested equipment, receives response returned by the tested equipment and provides the response to the special testing equipment, and the testing computer further determines test results according to the test data provided by the special testing equipment. By the system and the method, testing of protocol uniformity of a link layer and an application layer and key parameters and receiving performance indexes of a physical layer of the DSRC equipment can be realized, and product quality of the tested equipment can be guaranteed.
Description
Technical field
The present invention relates to technical field of intelligent traffic, particularly relate to Dedicated Short Range Communications, DSRC device test system and method.
Background technology
Dedicated Short Range Communications, (Dedicated Short Range Communication, being called for short DSRC) agreement is one of important basic communication protocol in intelligent transportation system field, is widely used in the fields such as road electric non-stop toll, Vehicular traffic information service, traffic information collection and the service of vehicle public safety.China in 2007 issuing and implementation GB/T20851 series DSRC national standard, meets the highway ETC(Electronic Toll Collection of this standard, electric non-stop toll afterwards) technology and product be widely used.The automatic charging of ETC system is by track antenna RSU(Road sideUnit, also claims roadside unit) and vehicle carried electronic label OBU(On Board Unit, also claim board units) realized by the mode of radio communication.
The nucleus equipment of ETC system comprises: OBU, RSU, OBU issuing equipment etc., these nucleus equipments are as DSRC special equipment, also can be applicable to other intelligent transportation fields, the fields such as such as Vehicular traffic information service, traffic information collection and the service of vehicle public safety.At present these ETC system nucleus equipments are by multiple manufacturer production, in real system application, if area protocol data and standard criterion are not inconsistent, performance index disunity, may cannot carry out the problem of normal communication between generation equipment.
The normal operation of DSRC communication system and carrying out smoothly of ETC business, the most important condition is the requirement that its nucleus equipment meets Its Relevant Technology Standards.To ETC nucleus equipment, the project of test is needed to comprise physical layer index (carrier frequency, frequency tolerance, spurious emissions, the index of modulation, baseband rate, waveform, antenna pattern, transmitted bandwidth, reception bandwidth, wake sensitivity, receiving sensitivity, reception cut-off level etc. up), the protocol conformance of data link layer and application layer, equipment application function etc.
For the physical layer emitting performance index of DSRC equipment as carrier frequency, frequency tolerance, spurious emissions, the index of modulation, baseband rate, waveform, antenna pattern, transmitted bandwidth etc., utilize general Microwave Test Equipment all can realize, as the said physical layer emitting performance index utilizing frequency spectrograph and oscilloscope to detect RSU, OBU and OBU issuing equipment.But for receptivity index (receiving sensitivity, reception cut-off level, OBU wake sensitivity etc. the up) test of DSRC nucleus equipment, launch desired signal owing to needing to customize special testing equipment, therefore current without unified method of testing.Owing to first needing the test data frame of design specialized, be entered in special test equipment and send; Next needs to monitor communication process, and monitoring is record test data also; 3rd needs to change signal power.Existing generic radio checkout equipment, as oscilloscope, signal source, spectrum analyzer, universal instrument, power meter etc., these specific test requests cannot be realized, such as cannot judge to test the parameter threshold level terminated, although and for example signal source can realize the automatic programming control of part, demodulation cannot be carried out to the DSRC data returned and analyse.
Summary of the invention
The embodiment of the present invention provides a kind of Dedicated Short Range Communications, DSRC device test system, in order to detect the physical layer key parameter of ETC system nucleus equipment and the protocol conformance, equipment application function etc. of performance index, data link layer and application layer, ensure the product quality of equipment under test, this system comprises:
Test computer, is provided with testing software, for selecting content measurement and configuration testing parameter according to equipment under test, controls testing process according to described content measurement and described test parameter;
Special test equipment, under the control of described test computer, produces DSRC test data and sends, and the response data that reception equipment under test returns also gives described test computer after resolving;
Signal source, for exporting DSRC test data according to the input data of special test equipment or the programming instruction of test computer;
Microwave antenna, for the DSRC test data provided to equipment under test transmitting special test equipment or signal source, the response that reception equipment under test returns also is supplied to special test equipment;
The test data determination test result of described test computer also for providing according to special test equipment.
Described special test equipment comprises:
Baseband signal resolution unit, resolves for the base band data exported by rf signal reception unit, is supplied to test computer;
Rf signal reception unit, for receiving the signal of described microwave antenna;
Baseband signal generation unit, for the instruction according to test computer, produces corresponding DSRC test data;
Radiofrequency signal generation unit, for being converted into radiofrequency signal by the baseband signal of described baseband signal generation unit;
Attenuator, for decaying to described radiofrequency signal;
Control and record cell, for controlling and record the attenuation coefficient of described attenuator, record the precise time of the transmission of described emission of radio frequency signals unit and described rf signal reception unit reception equipment under test return data.
Described equipment under test is vehicle carried electronic label (OBU), ETC trackside antenna (RSU), OBU issuing equipment, and described content measurement is the protocol conformance of equipment under test link layer and application layer, physical layer key parameter and receptivity index, equipment application function etc.;
Described physical layer performance test content comprises receptivity index test (what comprise the receiving sensitivity of described equipment under test, reception cut-off level and OBU the wakes sensitivity up) test of described equipment under test.
The embodiment of the present invention also provides a kind of DSRC apparatus testing method, detect in order to the protocol conformance of the physical layer to ETC system nucleus equipment, application layer and application layer, physical layer key parameter and performance index, equipment application function etc., ensure the product quality of equipment under test, the method comprises:
Step 1, test prepare: connecting test equipment, and test computer selects content measurement and configuration testing parameter according to equipment under test;
Step 2, generation Baseband Testing data:
The first method producing Baseband Testing data is: test computer sends test instruction to special test equipment according to content measurement and test parameter, and special test equipment receives test instruction, and produce Baseband Testing data, the method is conventional method;
The method that the second produces Baseband Testing data is: the signal source model can carrying out automated programming for some, Baseband Testing data directly can be exported to signal source by test computer, and do not need special test equipment to produce test baseband signal, now the baseband signal generation unit of special test equipment and emission of radio frequency signals unit do not participate in test;
Step 3, generation radio frequency testing data:
The first produces in the corresponding step 2 of method of radio frequency testing data, and the first produces the method for Baseband Testing data: Baseband Testing data transformations is that radio frequency testing data export to microwave antenna by the emission of radio frequency signals unit of special test equipment;
The second produces in the corresponding step 2 of method of radio frequency testing data that the first produces the method for Baseband Testing data: Baseband Testing data are exported to signal source by the baseband signal generation unit of special test equipment, is radio frequency testing data by signal source by Baseband Testing data transformations;
The third produces the second in the corresponding step 2 of method of radio frequency testing data and produces the method for Baseband Testing data: Baseband Testing data are supplied to signal source by test computer, is radio frequency testing data by signal source by Baseband Testing data transformations;
Step 4, produce DSRC aerial test signal: radio frequency testing data are sent by microwave antenna after radio frequency testing data being decayed by the attenuator of special test equipment;
Step 5, receive test signal separate new record: the rf signal reception unit of special test equipment receives the response signal of equipment under test, and after giving the base band data resolution unit parsing of special test equipment, be supplied to test computer, the control of special test equipment simultaneously and the temporal information of recording unit records DSRC signal transmitting and receiving;
Step 6, statistical test result: the test data that test computer provides according to special test equipment, determine test result, provide test result.This test data is not only the data of parsing, also has other data such as transmitting data, temporal information.
In the invention process, above-mentioned testing procedure can because of the difference of test item and equipment under test and slightly difference.
The present invention can realize ETC system nucleus equipment, as the physical layer key parameter of vehicle carried electronic label, ETC trackside antenna equipment, OBU issuing equipment etc. and the Aulomatizeted Detect of the protocol conformance of technical indicator, data link layer and application layer and the function of equipment application layer, ensure the product quality of equipment under test, reduce the cost of manual testing, improve test accuracy, shorten the testing time.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is the structural representation of DSRC device test system in the embodiment of the present invention;
Fig. 2 is the structural representation of special test equipment in the embodiment of the present invention;
Fig. 3 is the process chart of DSRC apparatus testing method in the embodiment of the present invention;
Fig. 4 is the structural representation of test macro when equipment under test is RSU in the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further details.At this, schematic description and description of the present invention is for explaining the present invention, but not as a limitation of the invention.
Fig. 1 is the structural representation of DSRC device test system in the embodiment of the present invention.As shown in Figure 1, in the embodiment of the present invention, DSRC device test system comprises:
Test computer 101, is provided with testing software, for selecting content measurement and configuration testing parameter according to equipment under test, controls testing process according to content measurement and test parameter; In enforcement, test computer can carry out test parameter configuration to special test equipment, general purpose test equipment, and Signal transmissions when controlling test;
Special test equipment 102, under the control of test computer 101, produces DSRC test data and sends to described equipment under test by microwave antenna 103, and the response data that reception equipment under test returns also gives described test computer after resolving;
Microwave antenna 103, for the DSRC test data provided to equipment under test transmitting special test equipment or signal source, the response that reception equipment under test returns also is supplied to special test equipment;
Signal source 104, for exporting DSRC test data according to the input data of special test equipment or the programming instruction of test computer;
The test data determination test result of test computer 101 also for providing according to special test equipment.
In the present invention, test computer 101 is connected by wired mode with special test equipment 102, as network interface or serial ports etc.; Connected by network interface between test computer 101 and signal source 104; Special test equipment 102 with signal source 104, all adopt Special-purpose connecting line to be connected between special test equipment 102 with microwave antenna 103; Microwave antenna 103 and equipment under test adopt DSRC mode to communicate.
In the present invention, microwave antenna 103 is the special test antenna of DSRC frequency range, and its signal gain and radiation direction are all known.
Nucleus equipment of the present invention is special test equipment 102, and special test equipment integrally works.Fig. 2 is the concrete illustrative view of functional configuration of special test equipment.As shown in Figure 2, special test equipment is made up of following function module:
Baseband signal resolution unit 1021, resolves for the base band data exported by rf signal reception unit, is supplied to test computer;
Rf signal reception unit 1022, for receiving the signal of described microwave antenna;
Baseband signal generation unit 1023, for the instruction according to test computer, produces corresponding DSRC test data;
Emission of radio frequency signals unit 1024, for being converted into radiofrequency signal by the baseband signal of described baseband signal generation unit;
Attenuator 1025, for decaying to described radiofrequency signal;
Control and record cell 1026, for controlling and record the attenuation coefficient of described attenuator, record the precise time of the transmission of described emission of radio frequency signals unit and described rf signal reception unit reception equipment under test return data.
The DSRC device test system of the embodiment of the present invention can detect as the protocol conformance of the data link layer of OBU, RSU and OBU issuing equipment etc., application layer, physical layer key parameter and receptivity index, equipment application function etc. ETC system nucleus equipment, ensures the product quality of equipment under test.Concrete, the physical layer key parameter of equipment under test and receptivity index test comprise tested RSU, OBU and OBU issuing equipment receiving sensitivity, receive cut-off level, receive bandwidth, OBU wake one of sensitivity or combination up.When equipment under test is OBU, the output data of test computer simulation RSU are carried out DSRC with OBU and are communicated, and record communication data are to detect OBU performance; When equipment under test is RSU or OBU issuing equipment, the control information of tested RSU or the OBU issuing equipment of test computer analogue enlargement computer control, the output data simultaneously simulating OBU are carried out DSRC with tested RSU or OBU issuing equipment and are communicated, and record communication data are to detect the performance of tested RSU or OBU issuing equipment.
Fig. 3 is the process chart of DSRC apparatus testing method in the embodiment of the present invention.As shown in Figure 3, in the embodiment of the present invention, DSRC apparatus testing method can comprise:
Step 301, test prepare: connecting test equipment, and test computer selects content measurement and configuration testing parameter according to equipment under test;
Step 302, generation Baseband Testing data:
The first method (3021) producing Baseband Testing data is: test computer sends test instruction to special test equipment according to content measurement and test parameter, special test equipment receives test instruction information, produce DSRC Baseband Testing data, the method is conventional method;
The method (3022) that the second produces Baseband Testing data is: the signal source model can carrying out automated programming for some, test DSRC base band data directly can be exported to signal source by test computer, and do not need special test equipment to produce test baseband signal, now the baseband signal generation unit of special test equipment and emission of radio frequency signals unit do not participate in test.
Step 303, generation radio frequency testing data:
The first produces in method (3031) the corresponding step 302 of radio frequency testing data, and the first produces the method 3021 of Baseband Testing data: Baseband Testing data transformations is that radiofrequency signal exports to microwave antenna by the emission of radio frequency signals unit 1024 of special test equipment, now the linked switch of Fig. 2 is pulled upward, i.e. terminal A;
The second produces the method 3021 of the first generation Baseband Testing data in method (3032) the corresponding step 302 of radio frequency testing data: Baseband Testing data are exported to signal source by the baseband signal generation unit 1023 of special test equipment, by signal source, baseband signal is converted into radiofrequency signal, now the linked switch of Fig. 2 is pulled downwards, i.e. terminal B;
The third produces the second in method (3032) the corresponding step 302 of radio frequency testing data and produces the method 3022 of Baseband Testing data: Baseband Testing data are supplied to signal source by test computer, by signal source, base band data is converted into radiofrequency signal, now the linked switch in the left side of Fig. 2 is unsettled, the linked switch on right side is pulled downwards, i.e. terminal B.
The difference of these three kinds of radiofrequency signal production methods is only limited by the performance of equipment, if the radio frequency output signal quality of signal source is higher, then prioritizing selection signal source (the second or the third method) emitting radio frequency signal, now the linked switch of Fig. 2 is pulled downwards, i.e. terminal B; Else if the signal quality of the radio frequency signal generation unit of special test equipment and scope better, then can select the radio frequency signal generation unit 1024(first method of special test equipment oneself) export radiofrequency signal, now the linked switch of Fig. 2 is pulled upward, i.e. terminal A.
Step 304, the aerial test signal of generation DSRC: test signal is sent by microwave antenna after being decayed by RF test signal by attenuator.
Step 305, receive test signal separate new record: the rf signal reception unit of special test equipment receives the response signal of equipment under test, and after giving the parsing of base band data resolution unit, be supplied to test computer, simultaneously the temporal information of special test equipment record DSRC signal transmitting and receiving.
Step 306, statistical test result: the test data that test computer provides according to special test equipment, determine test result, provide test result.
Below for concrete test item, implementation detail of the present invention is described:
embodiment 1:OBU wakes sensitivity test up
The physical layer of the present embodiment test OBU wakes sensitivity index up, in the present embodiment, test computer simulation RSU, carry out DSRC with tested OBU to communicate and detect it and wake sensitivity up, equipment connection is shown in Fig. 1, wherein Baseband Testing signal and RF test signal produce by special test equipment, and method is as follows:
Step 1, test prepare: test computer is selected and configuration testing parameter, (this can set according to actual needs apart from concrete value at a distance of 3 meters for tested OBU and microwave antenna, need far field condition be met), tested OBU is consistent with the phase center direction of microwave antenna simultaneously;
Step 2, generation Baseband Testing data: in test computer, run ETC radio-frequency (RF) index specific test and measure software, special test equipment is driven to produce test data, in the present embodiment, test data is BST(Beacon Service Table, beacon service table) signal;
Step 3, produce RF test signal: the rf data transmitter unit of special test equipment produces radiofrequency signal, now in Fig. 2 left side linkage switch spanner to terminal A;
Step 4, produce DSRC aerial test signal: regulate the special test equipment attenuator attenuates factor, launch DSRC aerial test b ST signal to tested OBU by microwave antenna, now in Fig. 2 left side linkage switch spanner to terminal A;
Step 5, receive test signal separate new record: the rf signal reception unit of special test equipment receives the response signal of tested OBU, and in this test case, response signal is VST; The base band data resolution unit of special test equipment resolves the data received, and is supplied to test computer, simultaneously the temporal information of special test equipment record DSRC signal transmitting and receiving.
In the present embodiment, when test starts, the decay of the attenuator of special test equipment is comparatively large, and tested OBU does not return response VST signal; Now return step 4, regulate the decay factor of the attenuator of special test equipment, gradually reduce pad value, improve the power of the BST signal that microwave antenna is launched, until OBU is waken up and returns the VST(Vebicle ServiceTable of expectation, vehicle service table) signal, the now control of special test equipment and the numerical value of recording unit records decay factor, complete and once test;
Step 6, statistical test value: repeat step 1-5, carry out 5 tests, the control of special test equipment and the numerical value of recording unit records 5 decay factors, and counter mean value, be set to S.
Step 7, simulation test provide result: position and the state of other testing equipments are constant, tested OBU is replaced with power meter, be connected by special wired mode with microwave antenna by power meter, inhibit signal source power is constant subsequently, and the pad value arranging attenuator is S; Test computer controls special test equipment output single carrier signal, the signal power P received by power measurement amount, and what calculate OBU wakes sensitivity up, unit dBm, and computing formula is:
OBU wakes sensitivity=P-G up;
Wherein, P is signal power, and unit is dBm; G is the gain of microwave antenna, and unit is dB.
embodiment 2:OBU testing protocol consistency
The present embodiment test data link layer of OBU and the protocol conformance of application layer, in the present embodiment, test computer simulation RSU, carry out DSRC with tested OBU to communicate and the accordance detecting its protocol data, equipment connection as shown in Figure 1, wherein Baseband Testing signal is produced by special test equipment, and RF test signal is produced by signal source, and method is as follows:
Step 1, test prepare: test computer is selected and configuration testing parameter, (this can set according to actual needs apart from concrete value at a distance of 3 meters for tested OBU and microwave antenna, need far field condition be met), tested OBU is consistent with the phase center direction of microwave antenna simultaneously;
Step 2, generation Baseband Testing data: in test computer, run DSRC protocol conformance specific test and measure software, drive special test equipment to produce test data, in the present embodiment, test data is the serial DSRC signal started with BST;
Step 3, generation RF test signal: special test equipment produces the input that base band data is supplied to signal source, and produce RF test signal by signal source, now in Fig. 2, the linked switch of left and right sides is all pulled to terminal B;
Step 4, the aerial test signal of generation DSRC: regulate the special test equipment attenuator attenuates factor, launch the aerial test signal of DSRC to tested OBU by microwave antenna;
In the present embodiment, when test starts, the numerical value of the attenuator of special test equipment is arranged to be needed to ensure that OBU effectively can receive the DSRC test signal of microwave antenna transmitting, and no longer regulate decay factor in test process, its numerical value is also without the need to record.
Step 5, receive test signal separate new record: the rf signal reception unit of special test equipment receives the response signal of tested OBU; The base band data resolution unit of special test equipment resolves the data received, and is supplied to test computer, simultaneously the temporal information of special test equipment record DSRC signal transmitting and receiving.
Step 6, statistical test result: repeat step 1-5, carry out the test of various protocol test example.BST wake-up signal should be comprised in the radiofrequency signal that each test case first time sends, guarantee that OBU is effectively waken up.The transmitting and receiving time of special test equipment record test signal, and intactly test computer is supplied to together with test data.Whether test computer receives test and returns results and carry out resolving and judging, meet the requirements according to program setting judged result, generates test report.
embodiment 3:RSU testing protocol consistency
The present embodiment test data link layer of RSU and the protocol conformance of application layer, in the present embodiment, test computer simulated roadway computer, to tested RSU emission control instruction, also simulate OBU simultaneously, carry out DSRC with tested RSU and communicate and the accordance detecting its protocol data, connection layout as shown in Figure 4, wherein Baseband Testing signal is produced by special test equipment, and RF test signal is produced by signal source, and concrete grammar is as follows:
Step 1, test prepare: test computer is selected and configuration testing parameter, (this can set according to actual needs apart from concrete value at a distance of 3 meters for tested RSU and microwave antenna, need far field condition be met), tested RSU is consistent with the phase center direction of microwave antenna simultaneously;
Step 2, generation Baseband Testing data: in test computer, run DSRC protocol conformance specific test and measure software, special test equipment is driven to produce test data, in the present embodiment, first computer controls tested RSU and launches the DSRC wake-up signal started with BST, simulates OBU afterwards again and receives and respond upward signal;
Step 3, generation RF test signal: test computer controls tested RSU and launches downlink data, simulate OBU returns correct in incorrect up response data simultaneously, detect the protocol data accordance of RSU, namely the data that arrive of simulation OBU are produced by special test equipment, be converted into RF test signal by signal source, now in Fig. 2, the linked switch of left and right sides is all pulled to terminal B;
Step 4, the aerial test signal of generation DSRC: regulate the special test equipment attenuator attenuates factor, guarantee that microwave antenna can receive up-downgoing test data, test computer controls tested RSU and communicates with special test equipment simulation ETC, the rf signal reception unit of special test equipment receives the signal of tested RSU, the base band data resolution unit of special test equipment resolves the data received, be supplied to test computer, simultaneously the temporal information of special test equipment record DSRC signal transmitting and receiving.
In the present embodiment, when test starts, the numerical value of the attenuator of special test equipment is arranged to be needed to ensure that OBU effectively can receive the DSRC test signal of microwave antenna transmitting, and no longer regulate decay factor in test process, its numerical value is also without the need to record.
Step 5, statistical test result: repeat step 1-4, carry out the test of various protocol test example.Each test case first time has tested RSU to send BST wake-up signal.The transmitting and receiving time of special test equipment record test signal, and intactly test computer is supplied to together with test data.Whether test computer receives test and returns results and carry out resolving and judging, meet the requirements according to program setting judged result, generates test report.
embodiment 4:OBU receives bandwidth test
The physical layer reception bandwidth of the present embodiment test OBU, in the present embodiment, test computer simulation RSU, carry out DSRC with tested OBU to communicate and detect it and wake sensitivity up, equipment connection is shown in Fig. 1, wherein Baseband Testing signal is produced by test computer, and RF test signal is produced by signal source, and method is as follows:
Step 1, test prepare: test computer is selected and configuration testing parameter, (this can set according to actual needs apart from concrete value at a distance of 3 meters for tested OBU and microwave antenna, need far field condition be met), tested OBU is consistent with the phase center direction of microwave antenna simultaneously;
Step 2, generation Baseband Testing data: in test computer, run ETC radio-frequency (RF) index specific test and measure software, drive special test equipment to produce test data, now in Fig. 2, left side linkage switch is unsettled;
Step 3, produce RF test signal: the computer control of signal source tested person produce RF test signal, now in Fig. 2 left side linkage switch spanner to B terminal;
Step 4, the aerial test signal of generation DSRC: regulate the special test equipment attenuator attenuates factor, launch the aerial test signal of DSRC to tested OBU by microwave antenna;
In the present embodiment, when test starts, the numerical value of the attenuator of special test equipment is arranged to be needed to ensure that tested OBU effectively can receive the DSRC test signal of microwave antenna transmitting, and after this decay factor no longer changes.
Special test BST signal first launched by test computer, reception test pattern is in after tested OBU receives, after this identical descending test DSRC data launched by test computer, and as Transferchannel.request order, tested OBU returns Transferchannel.response signal.
Step 5, receive test signal separate new record: the radio-frequency carrier center frequency point of adjustment signal source, depart from the numerical value that the downlink center frequency of setting is certain, until OBU no longer replys Transferchannel.response, then terminate once to test, record this test last signal source depart from setting carrier wave frequency values.
Step 6, statistical test result: repeat step 1-5, carry out 5 tests, calculate the mean value of departure freqency.
Wherein, the reception bandwidth of tested OBU is relative to the difference that departs from of frequency twocouese of setting center carrier frequence, when being 5.79GHz as launched descending carrier setting center frequency point, if the offset carrier frequency of twocouese is respectively 5.785GHz and 5.795GHz, then the reception bandwidth of OBU is 5.795-5.785=100MHz.
If equipment under test has different channels, then repeat above step measure different channels respectively under reception bandwidth.
embodiment 5:RSU receives bandwidth test
The physical layer reception bandwidth of the present embodiment test RSU, in the present embodiment, test computer simulated roadway computer, to tested RSU emission control instruction, also simulate OBU simultaneously, carry out DSRC with tested RSU to communicate and detect it and receive bandwidth, connection layout as shown in Figure 4, wherein Baseband Testing signal is produced by test computer, RF test signal is produced by signal source, method of testing is substantially the same manner as Example 4, and difference is that controlling tested RSU by test computer is in reception test mode, no longer transmitting data.
embodiment 6:OBU receives cut-off level test
In the present embodiment, test computer simulation RSU, carry out DSRC with tested OBU and communicate and detect it and receive cut-off level, equipment connection is shown in Fig. 1, and wherein Baseband Testing signal is produced by test computer, and RF test signal is produced by signal source, and method is as follows:
Step 1, test prepare: test computer is selected and configuration testing parameter, (this can set according to actual needs apart from concrete value at a distance of 3 meters for tested OBU and microwave antenna, need far field condition be met), tested OBU is consistent with the phase center direction of microwave antenna simultaneously;
Step 2, generation Baseband Testing data: in test computer, run ETC radio-frequency (RF) index specific test and measure software, drive special test equipment to produce test data, now in Fig. 2, left side linkage switch is unsettled;
Step 3, produce RF test signal: the computer control of signal source tested person produce RF test signal, now in Fig. 2 left side linkage switch spanner to B terminal;
Step 4, the aerial test signal of generation DSRC: regulate the special test equipment attenuator attenuates factor, launch the aerial test signal of DSRC to tested OBU by microwave antenna;
In the present embodiment, when test starts, the numerical value of the attenuator of special test equipment is arranged to be needed to ensure that tested OBU effectively can receive the DSRC test signal of microwave antenna transmitting.
Special test BST signal first launched by test computer, reception test pattern is in after tested OBU receives, after this identical descending test DSRC data launched by test computer, and as Transferchannel.request order, tested OBU returns Transferchannel.response signal.
Step 5, receive test signal separate new record: the attenuation value increasing special test equipment, until OBU no longer replys Transferchannel.response, the now control of special test equipment and the numerical value of recording unit records decay factor, complete and once test.
Step 6, statistical test value: repeat step 1-5, carry out 5 tests, the control of special test equipment and the numerical value of recording unit records 5 decay factors, and add up its mean value, be set to S.
Step 7, simulation test provide result: position and the state of other testing equipments are constant, tested OBU is replaced with power meter, be connected by special wired mode with microwave antenna by power meter, inhibit signal source power is constant subsequently, and the pad value arranging attenuator is S; Test computer controls special test equipment output single carrier signal, the signal power P received by power measurement amount, and what calculate OBU wakes sensitivity up, unit dBm, and computing formula is:
Reception cut-off level=the P-G of OBU;
Wherein, P is signal power, and unit is dBm; G is the gain of microwave antenna, and unit is dB.
embodiment 5:RSU receives cut-off level test
In the present embodiment, test computer simulated roadway computer, to tested RSU emission control instruction, simultaneously also simulate OBU, carry out DSRC with tested RSU and communicate and detect it and receive cut-off level, connection layout as shown in Figure 4, wherein Baseband Testing signal is produced by test computer, and RF test signal is produced by signal source, and method of testing is substantially the same manner as Example 6, difference is that controlling tested RSU by test computer is in reception test mode, no longer transmitting data.
In sum, the present invention can realize ETC system nucleus equipment, as the physical layer key parameter of vehicle carried electronic label, ETC trackside antenna equipment, OBU issuing equipment etc. and the Aulomatizeted Detect of the protocol conformance of technical indicator, data link layer and application layer and the function of equipment application layer, ensure the product quality of equipment under test, reduce the cost of manual testing, improve test accuracy, shorten the testing time.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a Dedicated Short Range Communications, DSRC device test system, is characterized in that, this system is made up of following equipment:
Test computer, is provided with testing software, for selecting content measurement and configuration testing parameter according to equipment under test, controls testing process according to described content measurement and described test parameter;
Special test equipment, under the control of described test computer, produces DSRC test data and sends, and the response data that reception equipment under test returns also gives described test computer after resolving;
Signal source, for exporting DSRC test data according to the input data of special test equipment or the programming instruction of test computer;
Microwave antenna, for the DSRC test data provided to equipment under test transmitting special test equipment or signal source, the response that reception equipment under test returns also is supplied to special test equipment;
The test data determination test result of described test computer also for providing according to special test equipment;
Described special test equipment comprises:
Baseband signal generation unit, for the instruction according to test computer, produces corresponding DSRC test data.
2. DSRC device test system as claimed in claim 1, it is characterized in that, described special test equipment comprises:
Baseband signal resolution unit, resolves for the base band data exported by rf signal reception unit, is supplied to test computer;
Rf signal reception unit, for receiving the signal of described microwave antenna;
Emission of radio frequency signals unit, for being converted into radiofrequency signal by the baseband signal of described baseband signal generation unit;
Attenuator, for decaying to described radiofrequency signal;
Control and record cell, for controlling and record the attenuation coefficient of described attenuator, record the precise time of the transmission of described emission of radio frequency signals unit and described rf signal reception unit reception equipment under test return data.
3. DSRC device test system as claimed in claim 2, it is characterized in that, described equipment under test is vehicle carried electronic label OBU, track antenna RSU or OBU issuing equipment, and described content measurement is protocol conformance, physical layer key parameter and one of the receptivity index, equipment application function of equipment under test link layer and application layer or combines.
4. DSRC device test system as claimed in claim 3, it is characterized in that, the physical layer key parameter of described equipment under test and receptivity index test comprise tested RSU, OBU and OBU issuing equipment receiving sensitivity, receive cut-off level, receive bandwidth, OBU wake up one of sensitivity or combination.
5. DSRC device test system as claimed in claim 1, is characterized in that, if when described equipment under test is OBU, the output data of test computer simulation RSU are carried out DSRC with OBU and communicated, and record communication data are to detect OBU performance; If when described equipment under test is RSU or OBU issuing equipment, the control information of tested RSU or the OBU issuing equipment of test computer analogue enlargement computer control, simulate OBU to carry out DSRC with tested RSU or OBU issuing equipment and communicate, and record communication data are to detect tested RSU or OBU issuing equipment performance simultaneously.
6. a DSRC apparatus testing method, is characterized in that, comprising:
Step 1, test prepare: connecting test equipment, and test computer selects content measurement and configuration testing parameter according to equipment under test;
Step 2, generation Baseband Testing data;
Step 3, generation radio frequency testing data;
Step 4, produce DSRC aerial test signal: radio frequency testing data are sent by microwave antenna after radio frequency testing data being decayed by the attenuator of special test equipment;
Step 5, receive test signal separate new record: the rf signal reception unit of special test equipment receives the response signal of equipment under test, and after giving the base band data resolution unit parsing of special test equipment, be supplied to test computer, the control of special test equipment simultaneously and the temporal information of recording unit records DSRC signal transmitting and receiving;
Step 6, statistical test result: the test data that test computer provides according to special test equipment, determine test result, provide test result;
Produce Baseband Testing data, comprising:
Test computer sends test instruction to special test equipment according to content measurement and test parameter, and the baseband signal generation unit of special test equipment receives test instruction, produces Baseband Testing data, or
Test computer produces Baseband Testing data.
7. DSRC apparatus testing method as claimed in claim 6, is characterized in that,
When the baseband signal generation unit of special test equipment produces Baseband Testing data, produce radio frequency testing data, comprising:
Baseband Testing data transformations is radio frequency testing data by the emission of radio frequency signals unit of special test equipment;
Or Baseband Testing data are exported to signal source by the baseband signal generation unit of special test equipment, be radio frequency testing data by signal source by Baseband Testing data transformations.
8. DSRC apparatus testing method as claimed in claim 6, is characterized in that, when test computer produces Baseband Testing data, produces radio frequency testing data, comprising:
Baseband Testing data are supplied to signal source by test computer, are radio frequency testing data by signal source by Baseband Testing data transformations.
9. DSRC apparatus testing method as claimed in claim 6, it is characterized in that, described equipment under test is OBU, RSU and OBU issuing equipment, and described content measurement is protocol conformance and the key parameter of equipment under test link layer and application layer.
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Effective date of registration: 20160621 Address after: 100161 Beijing city Fengtai District six Lane Bridge No. 9 the first building block C room 902 Patentee after: BEIJING YILUXING TECHNOLOGY CO., LTD. Patentee after: Beijing Sutong Technology Co., Ltd. Address before: 100161 Beijing city Fengtai District six Lane Bridge No. 9 the first building block C room 902 Patentee before: Beijing Sutong Technology Co., Ltd. |