CN112881830B - Electromagnetic compatibility test method of vehicle-mounted terminal - Google Patents
Electromagnetic compatibility test method of vehicle-mounted terminal Download PDFInfo
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- CN112881830B CN112881830B CN202110056722.9A CN202110056722A CN112881830B CN 112881830 B CN112881830 B CN 112881830B CN 202110056722 A CN202110056722 A CN 202110056722A CN 112881830 B CN112881830 B CN 112881830B
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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 part level test platform; s2, performing electromagnetic radiation emission test and electromagnetic immunity test of the V2X terminal in a normal communication state. The method has important guiding significance for testing the network connection component, no definite standard and requirement exists for electromagnetic compatibility testing of the network connection component, but the method has important significance for researching the follow-up standard, and provides a certain guiding for developing the electromagnetic compatibility testing of the network connection component for enterprises or laboratories.
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 full scale Vihicle to everything, i.e., the association of vehicles with anything, mainly includes V2V vehicles with vehicles, V2I vehicles with infrastructure, V2P vehicles with people, V2N vehicles with clouds. The vehicle is a technology for communicating with other surrounding vehicles, people and objects through sensors and network communication technology, and analyzing and deciding according to the collected information. The internet of vehicles V2X has two important terminals, one is an on-board unit (OBU) mounted on the vehicle and the other is a roadside unit (RSU) mounted on the roadside or at the traffic intersection.
Currently, a main reference standard GB 32960.2 for electromagnetic compatibility test of a traditional vehicle-mounted terminal is an electric vehicle remote service and management system technical specification-part 2: vehicle terminals, however, cannot monitor various signals such as vehicle 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 the signals can stably and reliably work in an electromagnetic environment or not needs to be tested and verified one by building a test environment.
Disclosure of Invention
In view of this, the present invention aims to propose an electromagnetic compatibility test method for a vehicle-mounted terminal, so as to verify the electromagnetic radiation power of the V2X terminal in a normal communication state and the stability of functions and performances under electromagnetic immunity.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
an electromagnetic compatibility test method of a vehicle-mounted terminal, comprising the following steps: s1, building an LTE-V2X part level test platform; s2, performing electromagnetic radiation emission test and electromagnetic immunity test of the V2X terminal.
Further, the test platform includes:
the darkroom is used for placing a terminal DUT to be tested;
the business terminal is arranged outside the darkroom and is used for carrying out V2V communication with the DUT (device under test) in the darkroom;
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 business terminal;
the monitoring PC is placed outside the darkroom, is connected with the commercial terminal through signals and is used for observing the positioning state of the DUT of the terminal to be tested and the data transmission error rate index in real time; and
the EMS/EMI test system is used for generating electromagnetic interference signals to carry out electromagnetic compatibility test.
Further, during the electromagnetic radiation emission test, the DUT in the darkroom and the commercial terminal outside the darkroom are in a V2V communication state, and meanwhile, GPS signals are introduced into the darkroom to ensure that the DUT is in a normal positioning state; verifying electromagnetic radiation characteristics of the DUT in four communication states.
Further, when electromagnetic immunity test is performed, the DUT is normally powered on, and communication is normally operated; the method specifically comprises the following steps:
performing a 20M-2G vertical polarization test by adopting an ALSE method, skipping a GPS frequency band, wherein the test grade is 100V/M, and the modulation mode is CW; the positioning state and the data transmission error rate of the DUT are observed in real time through a monitoring PC outside the dark room, and the frequency range when the communication interruption phenomenon occurs is recorded;
the portable transmitter immunity test comprises the steps of selecting 2400-2500 MHz and 5725-5850MHz of test frequency bands, testing a plurality of points of a sample, observing the positioning state of the DUT and the data transmission error rate in real time through a monitoring PC outside a dark room, and recording the frequency band range when the communication interruption phenomenon occurs.
Compared with the prior art, the method provided by the invention has the following advantages:
(1) The method has important guiding significance for testing the network connection component, no definite standard and requirement exists for electromagnetic compatibility testing of the network connection component, but the method has important significance for researching the follow-up standard, and provides a certain guiding for developing the electromagnetic compatibility testing of the network connection component for enterprises or laboratories.
(2) The test platform of the method is reasonable in design and easy to realize, and can provide electromagnetic radiation emission test and electromagnetic immunity test of the V2X terminal in a normal communication state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain 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 physical diagram of a radiation emission arrangement according to an embodiment of the present invention;
FIG. 4 is a physical diagram of a radiation disturbance rejection arrangement according to an embodiment of the present invention;
FIG. 5 is a physical diagram of a portable transmitter immunity test arrangement according to an embodiment of the present invention;
fig. 6 is a diagram illustrating the interference location according to an embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
lte-V2X communication system profile
The LTE-V2X is a V2X Internet of vehicles wireless communication technology formed based on the evolution of the LTE mobile communication technology, and the vehicle-mounted information interaction system based on the LTE-V2X can provide support for vehicle-to-vehicle (V2V), vehicle-to-road (V2I), vehicle-to-network (V2N) and vehicle-to-person (V2P) application through the LTE-V2X communication. The principle of the vehicle-mounted information interaction system is shown in fig. 1, and the vehicle-mounted information interaction system mainly comprises the following basic components:
(1) Wireless communication subsystem: receiving and transmitting aerial wireless signals for communication with other vehicle-mounted information interaction systems, infrastructures, pedestrians and the like;
(2) Positioning subsystem: the positioning system can support lane-level positioning, inertial navigation, differential positioning and other positioning modes, and improves positioning accuracy;
(3) The vehicle-mounted equipment processing unit: processing various signal transmissions;
(4) An antenna: the wireless radio frequency signal is sent and received.
2. EMC test implementation (EMC test is also called electromagnetic compatibility) based on LTE-V2X vehicle-mounted terminal
2.1 test System arrangement
The test mainly simulates the communication scene of two terminals, and the test such as EMS and EMI is carried out by building an LTE-V2X component level test platform, so that the electromagnetic radiation power of the V2X terminal (terminal to be tested) in the normal communication state and the stability of functions and performances 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 for providing positioning information to the terminal to be tested and the other for providing positioning information to the business terminal);
a business terminal placed outside the darkroom for being in a V2V communication state with the DUT (device under test Device Under Test) inside the darkroom;
the monitoring PC is arranged 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
the EMS/EMI test system is used for generating electromagnetic interference signals to carry out electromagnetic compatibility test.
2.2 electromagnetic radiation emission test
Test methods refer to GB/T18655-2018, test range 150kHz-2.5GHz, and vertical polarization test only. The DUT in the darkroom and the commercial terminal outside the darkroom are in a V2V communication state, and meanwhile GPS signals are introduced into the darkroom, so that the DUT can be in a normal positioning state. Actual test arrangement as shown in fig. 3, to verify electromagnetic radiation characteristics of different communication states of the DUT, the DUT is divided into several operating states as follows:
mode one: the DUT is not powered on, and the bottom noise is detected;
mode two: the DUT is powered on normally and the communication works normally;
mode three: the DUT is normally powered on, so that V2V communication is guaranteed, and GPS signals are disconnected;
mode four: the DUT is normally powered on, so that GPS communication is guaranteed, and the V2V signal is disconnected.
2.3 electromagnetic immunity test
The test content of this section is arranged in a similar way to 2.2, as shown in fig. 4 and 5. But only one of the DUT's operating states is the DUT is powered up normally and the communications are operating normally.
The part test purpose is as follows: the method is used for monitoring 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 processes.
The monitoring mode is to observe indexes such as the positioning state of the DUT, the data transmission error rate and the like in real time through a PC end outside the dark room.
2.4 electromagnetic immunity test
2.4.1ALSE method immunity test
Test methods are 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 220MHz frequency point, the V2X communication state is interrupted, and the specific phenomenon is that in a monitoring picture, a data refreshing picture of the PC stops. An engineer is required to recover after simple repair.
2.4.2 Portable transmitter immunity test
Test arrangement and test method refer to ISO 11452-9 2012. Considering that the C-V2X communication working frequency ranges are around 2.4GHz and 5.9GHz, the test frequency ranges are 2400-2500 MHz and 5725-5850MHz. The 4 points of the test sample are shown in fig. 6.
In the range of 5725-5850MHz, communication interruption phenomenon occurs in the position 4 test process, and the test can be automatically recovered after the test is finished.
The scheme provides an LTE-V2X electromagnetic radiation and immunity testing method, which has important guiding significance for testing network connection components. With the development of intelligent and networking of automobiles, more and more electronic appliances are arranged on automobiles, so that the problem of electromagnetic compatibility is more and more serious. There are no clear standards and requirements for electromagnetic compatibility testing of networking components. The scheme of the invention has important significance for the research of the subsequent standard, and provides a certain guide for enterprises or laboratories to develop the electromagnetic compatibility test of the networking component.
The embodiment of the invention comprises the following steps:
electromagnetic radiation test methods refer to transmission GB/T18655-2018. The test range is 150kHz-2.5GHz, and only vertical polarization tests are performed. As the DUT in the darkroom and the commercial terminal outside the darkroom are in the V2V communication state, and meanwhile, the GPS signals are introduced into the darkroom, the DUT is ensured to be in the normal positioning state. Electromagnetic immunity test method reference ISO 11452-9 2012. Considering that the C-V2X communication working frequency ranges are around 2.4GHz and 5.9GHz, the test frequency ranges are 2400-2500 MHz and 5725-5850MHz.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (2)
1. An electromagnetic compatibility test method of a vehicle-mounted terminal is characterized by comprising the following steps:
s1, building an LTE-V2X part level test platform;
s2, performing electromagnetic radiation emission test and electromagnetic immunity test of the V2X terminal;
when electromagnetic radiation emission test is carried out, the DUT in the darkroom and a commercial terminal outside the darkroom are in a V2V communication state, and meanwhile, GPS signals are introduced into the darkroom to ensure that the DUT is in a normal positioning state; verifying electromagnetic radiation characteristics of a DUT in four communication states:
mode one: the DUT is not powered on, and the bottom noise is detected;
mode two: the DUT is powered on normally and the communication works normally;
mode three: the DUT is normally powered on, so that V2V communication is guaranteed, and GPS signals are disconnected;
mode four: the DUT is normally powered on, so that GPS communication is guaranteed, and the V2V signal is disconnected;
when electromagnetic immunity test is carried out, the DUT is normally powered on, and communication is normally operated; the method specifically comprises the following steps:
performing a 20M-2G vertical polarization test by adopting an ALSE method, skipping a GPS frequency band, wherein the test grade is 100V/M, and the modulation mode is CW; the positioning state and the data transmission error rate of the DUT are observed in real time through a monitoring PC outside the dark room, and the frequency range when the communication interruption phenomenon occurs is recorded;
the portable transmitter immunity test comprises the steps of selecting 2400-2500 MHz and 5725-5850MHz of test frequency bands, testing a plurality of points of a sample, observing the positioning state of the DUT and the data transmission error rate in real time through a monitoring PC outside a dark room, and recording the frequency band range when the communication interruption phenomenon occurs.
2. The method according to claim 1, characterized in that: the test platform comprises:
the darkroom is used for placing a terminal DUT to be tested;
the business terminal is arranged outside the darkroom and is used for carrying out V2V communication with the DUT (device under test) in the darkroom;
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 business terminal;
the monitoring PC is placed outside the darkroom, is connected with the commercial terminal through signals and is used for observing the positioning state of the DUT of the terminal to be tested and the data transmission error rate index in real time; and
the EMS/EMI test system is used for generating electromagnetic interference signals to carry out electromagnetic compatibility test.
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