CN112881830A - Electromagnetic compatibility test method of vehicle-mounted terminal - Google Patents
Electromagnetic compatibility test method of vehicle-mounted terminal Download PDFInfo
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- CN112881830A CN112881830A CN202110056722.9A CN202110056722A CN112881830A CN 112881830 A CN112881830 A CN 112881830A CN 202110056722 A CN202110056722 A CN 202110056722A CN 112881830 A CN112881830 A CN 112881830A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides an electromagnetic compatibility test method of a vehicle-mounted terminal, which comprises the following steps: s1, building an LTE-V2X component level test platform; and S2, performing an electromagnetic radiation emission test and an electromagnetic immunity test of the V2X terminal in a normal communication state. The method has important guiding significance for testing the network connection part, no clear standard and requirement exist for the electromagnetic compatibility test of the network connection part, the method has important significance for the research of subsequent standards, and certain guidance is provided for enterprises or laboratories to develop the electromagnetic compatibility test of the network connection part.
Description
Technical Field
The invention belongs to the technical field of electromagnetic compatibility testing, and particularly relates to an electromagnetic compatibility testing method of a vehicle-mounted terminal.
Background
V2X is called "Vihicle to eventing", i.e. the connection between car and anything, mainly including V2V car and car, V2I car and infrastructure, V2P car and person, V2N car and cloud. The detailed point is that the vehicle communicates with other surrounding vehicles, people and objects through sensors and network communication technology, and the technology analyzes and makes decisions according to the collected information. The internet of vehicles V2X has two important terminals, one is a unit (OBU) mounted on a vehicle, and the other is a Road Side Unit (RSU) installed at a roadside or a traffic intersection.
At present, the main reference standard for the electromagnetic compatibility test of the traditional vehicle-mounted terminal is GB 32960.2 "technical specification of electric vehicle remote service and management system — part 2: vehicle-mounted terminal, but it cannot monitor various signals such as vehicle-mounted GPS communication, cellular communication, LTE-V, and the like.
Along with the development of vehicle intellectualization and networking, more and more intelligent networking terminals have multiple communication functions, and whether these signals can stably and reliably work under the electromagnetic environment needs to be tested and verified one by building a test environment.
Disclosure of Invention
In view of this, the present invention is directed to provide an electromagnetic compatibility testing method for a vehicle-mounted terminal, so as to verify electromagnetic radiation power of a V2X terminal in a normal communication state and stability of functions and performance under electromagnetic immunity.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an electromagnetic compatibility test method of a vehicle-mounted terminal comprises the following steps: s1, building an LTE-V2X component level test platform; and S2, performing an electromagnetic radiation emission test and an electromagnetic immunity test of the V2X terminal.
Further, the test platform comprises:
the darkroom is used for placing a terminal DUT to be tested;
the commercial terminal is placed outside the darkroom and is used for carrying out V2V communication with a terminal DUT to be tested in the darkroom;
2 satellite simulators, one used for providing positioning information for the terminal to be tested, and the other used for providing positioning information for the commercial terminal;
the monitoring PC is placed outside the darkroom, is in signal connection with the commercial terminal and is used for observing the positioning state and the data transmission error rate index of the terminal DUT to be tested in real time; and
EMS/EMI test system for generating electromagnetic interference signal to carry out electromagnetic compatibility test.
Further, during the electromagnetic radiation emission test, a DUT in the darkroom and a commercial terminal outside the darkroom are in a V2V communication state, and meanwhile, a GPS signal is introduced into the darkroom to ensure that the DUT is in a normal positioning state; and verifying the electromagnetic radiation characteristics of the DUT in four communication states.
Further, when the electromagnetic immunity test is carried out, the DUT is normally powered on, and the communication is normally operated; the method specifically comprises the following steps:
performing radiation immunity test, namely performing 20M-2G vertical polarization test by adopting an ALSE method immunity test, skipping over a GPS frequency band, wherein the test grade is 100V/M, and the modulation mode is CW; observing the positioning state and the data transmission error rate of the DUT in real time through a monitoring PC outside a darkroom, and recording the frequency range when the communication interruption phenomenon occurs;
and (3) carrying out anti-interference test on the portable transmitter, selecting 2400-2500 MHz and 5725-5850MHz as test frequency bands, testing a plurality of points of a sample, observing the positioning state and the data transmission error rate of the DUT in real time through a monitoring PC outside a darkroom, and recording the frequency band range when the communication interruption phenomenon occurs.
Compared with the prior art, the method has the following advantages:
(1) the method has important guiding significance for testing the network connection part, no clear standard and requirement exist for the electromagnetic compatibility test of the network connection part, the method has important significance for the research of subsequent standards, and certain guidance is provided for enterprises or laboratories to develop the electromagnetic compatibility test of the network connection part.
(2) The test platform of the method is reasonable in design and easy to realize, and can provide the electromagnetic radiation emission test and the electromagnetic immunity test of the V2X terminal in a normal communication state.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a vehicle information interaction system;
fig. 2 is a schematic diagram of an LTE-V2X component level test platform according to an embodiment of the present invention;
FIG. 3 is a pictorial view of a radiation emitting arrangement according to an embodiment of the present invention;
FIG. 4 is a diagram of a radiation immunity arrangement according to an embodiment of the present invention;
FIG. 5 is a physical diagram of an anti-interference test layout of a portable transmitter according to an embodiment of the present invention;
fig. 6 is a diagram illustrating interference locations according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
LTE-V2X communication System Profile
The LTE-V2X refers to a V2X vehicle networking wireless communication technology formed based on the evolution of an LTE mobile communication technology, and the vehicle-mounted information interaction system based on the LTE-V2X can realize the support of vehicle-vehicle (V2V), vehicle-road (V2I), vehicle-network (V2N) and vehicle-person (V2P) applications through the LTE-V2X communication. The principle of the vehicle-mounted information interaction system is shown in fig. 1, and mainly comprises the following basic components:
(1) the wireless communication subsystem: receiving and transmitting air wireless signals for communicating with other vehicle-mounted information interaction systems, infrastructures, pedestrians and the like;
(2) positioning the subsystem: the method can support lane-level positioning, support positioning modes such as inertial navigation and difference, and improve positioning accuracy;
(3) an in-vehicle device processing unit: processing various signal transmissions;
(4) an antenna: and the wireless radio frequency signal is transmitted and received.
2. EMC test implementation based on LTE-V2X vehicle terminal (EMC test is also called electromagnetic compatibility)
2.1 test System layout
The test mainly simulates communication scenes of two terminals, EMS and EMI tests are carried out by building an LTE-V2X component level test platform, and the electromagnetic radiation power of the V2X terminal (terminal to be tested) in a normal communication state and the stability of functions and performance under electromagnetic interference resistance are verified.
As shown in fig. 2, the test platform includes:
a darkroom for placing a terminal to be tested;
2 satellite simulators (one is used for providing positioning information for a terminal to be tested, and the other is used for providing positioning information for a commercial terminal);
a commercial terminal placed outside a darkroom for communicating with a Device Under Test (DUT) in the darkroom at V2V;
the monitoring PC is placed outside the darkroom and is used for observing indexes such as the positioning state of the DUT, the data transmission error rate and the like in real time; and
EMS/EMI test system for generating electromagnetic interference signal to carry out electromagnetic compatibility test.
2.2 electromagnetic radiation emission test
The test method refers to GB/T18655-2018, the test range is 150kHz-2.5GHz, and only the vertical polarization test is carried out. The DUT in the darkroom is in V2V communication with the commercial terminal outside the darkroom, while the GPS signal is introduced in the darkroom to ensure that the DUT is in a normal position. The actual test arrangement is shown in fig. 3, in order to verify the electromagnetic radiation characteristics of the DUT in different communication states, the DUT is divided into the following operating states:
the first mode is as follows: the DUT is not electrified, and the bottom noise is detected;
and a second mode: the DUT is normally powered on, and the communication works normally;
and a third mode: the DUT is normally powered on, V2V communication is guaranteed, and GPS signals are disconnected;
and a fourth mode: the DUT is normally powered on, GPS communication is guaranteed, and the V2V signal is disconnected.
2.3 electromagnetic immunity test
The test content in this section is arranged in a manner similar to that of 2.2, as shown in fig. 4 and 5. But the DUTs only operate in one state, i.e., the DUTs are powered up normally and the communications are operating normally.
This part of the test was for the purpose: the method monitors whether the function and the performance of the DUT are reliable in a communication state in the radiation immunity test and the portable transmitter immunity test.
The monitoring mode is to observe indexes such as the positioning state of the DUT and the data transmission error rate in real time through a PC (personal computer) terminal outside a darkroom.
2.4 electromagnetic immunity test
2.4.1ALSE method of interference rejection testing
The test method is referred to ISO 11452-2-2004. Only 20M-2G vertical polarization test (skipping GPS frequency band) is carried out, the test grade is 100V/M, and the modulation mode is CW.
In the vicinity of the frequency point of 220MHz, the communication state of V2X is interrupted, and the specific phenomenon is that the data refreshing picture of the PC stops in the monitoring picture. Requiring the engineer to simply recover after repair.
2.4.2 Portable transmitter immunity test
The test arrangement and test method are referred to ISO 11452-92012. Considering that the C-V2X communication operating frequency band is around 2.4GHz and 5.9GHz, the test frequency band is selected from 2400-2500 MHz and 5725-5850 MHz. The samples were tested at 4 points as shown in figure 6.
In the range of 5725-5850MHz, the communication interruption phenomenon occurs in the test process of the position 4, and the test can be automatically recovered after the test is finished.
The scheme provides an LTE-V2X electromagnetic radiation and noise immunity testing method, and the method has important guiding significance for testing the networking component. Along with the development of automobile intellectualization and networking, more and more electronic appliances are arranged on the automobile, and the problem of electromagnetic compatibility caused by the fact is more and more serious. There are no clear standards and requirements for testing the electromagnetic compatibility of networking components. The scheme of the invention has important significance for the research of subsequent standards, and provides certain guidance for enterprises or laboratories to develop the electromagnetic compatibility test of the networking parts.
The embodiment of the invention comprises the following steps:
the electromagnetic radiation test method refers to GB/T18655-2018. The test range is 150kHz-2.5GHz, and only the vertical polarization test is carried out. Because the DUT in the darkroom is in a V2V communication state with the commercial terminal outside the darkroom, and simultaneously, the GPS signal is introduced into the darkroom, the DUT can be ensured to be in a normal positioning state. The electromagnetic interference resistance test method is referred to ISO 11452-92012. Considering that the C-V2X communication operating frequency band is around 2.4GHz and 5.9GHz, the test frequency band is selected from 2400-2500 MHz and 5725-5850 MHz.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. An electromagnetic compatibility test method of a vehicle-mounted terminal is characterized by comprising the following steps:
s1, building an LTE-V2X component level test platform;
and S2, performing an electromagnetic radiation emission test and an electromagnetic immunity test of the V2X terminal.
2. The method of claim 1, wherein: the test platform comprises:
the darkroom is used for placing a terminal DUT to be tested;
the commercial terminal is placed outside the darkroom and is used for carrying out V2V communication with a terminal DUT to be tested in the darkroom;
2 satellite simulators, one used for providing positioning information for the terminal to be tested, and the other used for providing positioning information for the commercial terminal;
the monitoring PC is placed outside the darkroom, is in signal connection with the commercial terminal and is used for observing the positioning state and the data transmission error rate index of the terminal DUT to be tested in real time; and
EMS/EMI test system for generating electromagnetic interference signal to carry out electromagnetic compatibility test.
3. The method of claim 2, wherein: when an electromagnetic radiation emission test is carried out, a DUT in a darkroom and a commercial terminal outside the darkroom are in a V2V communication state, and meanwhile, a GPS signal is introduced into the darkroom to ensure that the DUT is in a normal positioning state; and verifying the electromagnetic radiation characteristics of the DUT under the following four communication states:
the first mode is as follows: the DUT is not electrified, and the bottom noise is detected;
and a second mode: the DUT is normally powered on, and the communication works normally;
and a third mode: the DUT is normally powered on, V2V communication is guaranteed, and GPS signals are disconnected;
and a fourth mode: the DUT is normally powered on, GPS communication is guaranteed, and the V2V signal is disconnected.
4. The method of claim 2, wherein: when the electromagnetic immunity test is carried out, the DUT is normally powered on, and the communication normally works; the method specifically comprises the following steps:
performing radiation immunity test, namely performing 20M-2G vertical polarization test by adopting an ALSE method immunity test, skipping over a GPS frequency band, wherein the test grade is 100V/M, and the modulation mode is CW; observing the positioning state and the data transmission error rate of the DUT in real time through a monitoring PC outside a darkroom, and recording the frequency range when the communication interruption phenomenon occurs;
and (3) carrying out anti-interference test on the portable transmitter, selecting 2400-2500 MHz and 5725-5850MHz as test frequency bands, testing a plurality of points of a sample, observing the positioning state and the data transmission error rate of the DUT in real time through a monitoring PC outside a darkroom, and recording the frequency band range when the communication interruption phenomenon occurs.
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