CN108152622B - Interference degree quantitative evaluation method for vehicle-mounted communication system in wave-absorbing darkroom - Google Patents
Interference degree quantitative evaluation method for vehicle-mounted communication system in wave-absorbing darkroom Download PDFInfo
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- CN108152622B CN108152622B CN201711366840.XA CN201711366840A CN108152622B CN 108152622 B CN108152622 B CN 108152622B CN 201711366840 A CN201711366840 A CN 201711366840A CN 108152622 B CN108152622 B CN 108152622B
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Abstract
The invention belongs to the technical field of electromagnetic compatibility test evaluation of a communication system, and particularly relates to a quantitative evaluation method for the disturbed degree of an on-vehicle communication system in a wave-absorbing darkroom. The invention deduces the relation between the scanning amplitude and the sensitivity of the antenna port of the vehicle-mounted communication system by using a large amount of data measured by the communication port. And processing the antenna port test data and the sensitivity calibration value to obtain a quantitative conversion formula of the interference degree of the vehicle-mounted communication system, and generating quantitative data by using the conversion formula to judge the interference degree of the vehicle-mounted communication system.
Description
Technical Field
The invention belongs to the technical field of electromagnetic compatibility test evaluation of a communication system, and particularly relates to a quantitative evaluation method for the disturbed degree of an on-vehicle communication system in a wave-absorbing darkroom.
Background
At present, the integration level of vehicle-mounted electronic equipment of military vehicles is higher and higher, the increase of high-power electronic equipment greatly increases electronic interference, the receiving sensitivity of a vehicle-mounted communication system is often reduced after the vehicle-mounted communication system is installed, and performance indexes are greatly reduced. At present, the performance change of the installed communication system can be rapidly and quantitatively shown in urgent need, and no detailed rapid broadband communication port quantitative measurement method exists in the electromagnetic compatibility test evaluation of the military vehicle-mounted communication system. The common communication system test evaluation method is influenced by test conditions, test states and test contents, and cannot comprehensively and accurately reflect the electromagnetic compatibility of the communication system. In order to overcome the problem, an evaluation method for quantifying the interference degree of the vehicle-mounted communication system in the wave-absorbing darkroom needs to be provided. The method is used for generating the quantized data to judge the disturbed degree of the vehicle-mounted communication system, and the accuracy of the electromagnetic compatibility evaluation of the communication system can be improved.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to provide an evaluation method capable of accurately quantifying communication performance changes after the vehicle-mounted communication system is installed. The method mainly examines the coupling interference condition of the communication system port in the complex environment in the vehicle, and can accurately evaluate the interference degree of the vehicle-mounted communication system.
(II) technical scheme
In order to solve the technical problem, the invention provides a quantitative evaluation method for the disturbed degree of an on-board communication system in a wave-absorbing darkroom, which comprises the following steps:
step 1, obtaining noise level test data of an antenna port of a communication system;
step 2, extracting sampling frequency points;
step 3, obtaining a sensitivity calibration value of the communication system;
step 4, generating quantized data by using a conversion formula;
and 5, evaluating the disturbed condition of the communication system.
In step 1, the noise level of the antenna port of the communication system is measured in the anechoic chamber, and the test curve is measured by using the receiver.
The test curves comprise a peak value scan curve and an average value scan curve, and the peak value scan curve and the average value scan curve are measured by using a detection mode of amplitude peak values and amplitude average values of the receiver.
In the step 2, comparing the peak value scanning curve and the average value scanning curve obtained in the step 1 with an environment curve, and defining a part which is higher than the amplitude level of the test value in the environment curve by more than 6dB as an interference area; and selecting frequency points in the frequency range of the interference area on the test curve as sampling frequency points.
Selecting frequency points with the following characteristics as sampling frequency points in a frequency range of an interference area on a test curve;
the sampling frequency point at least has the following two characteristics at the same time:
within the interference region frequency range;
peak amplitude higher than center frequency F0The peak amplitude of plus or minus 25kHz is more than 3 dB;
the difference between the peak and mean amplitudes is within 6 dB.
In step 3, the communication system sensitivity is calibrated in the anechoic chamber under the conditions of the non-interference environment and the loading interference environment, and the communication system sensitivity calibration values in the two states are recorded.
In step 4, the sampling frequency point selected in step 2 and the sensitivity of the communication system measured in step 3 are used as input conditions, and X, Y value generated by using a conversion formula X ═ a | -B, Y ═ a | -C is used as quantized data.
Where a is the communication system sensitivity calibration obtained in step 3.
B is the amplitude of the sampling frequency point selected in the step 2 on the average value scanning curve; and C is the amplitude of the sampling frequency point selected in the step 2 on the peak value scanning curve.
After the quantized data X, Y are sorted, the quantized data X, Y in an interference-free environment and a loading interference environment are respectively compared, and the interference situation of the communication system is judged by comparing the requirements in the evaluation criterion:
TABLE 1 evaluation criteria for disturbed conditions of a communication system
| Corresponding sensitivity value range | X+Y | Rating of evaluation | Effect of communication |
| -107～-113dBm | 235～250 | 1 | Is very good |
| -102～-107dBm | 205～235 | 2 | In general |
| -96～-102dBm | 160～205 | 3 | Is poor |
| ≥-96dBm | ≤160 | 4 | Very poor |
(III) advantageous effects
Compared with the prior art, the interference degree quantitative evaluation method for the vehicle-mounted communication system in the wave-absorbing darkroom is provided, the coupling interference condition of the port of the vehicle-mounted communication system in the complex environment in the vehicle is examined, the conditions that the communication performance is reduced and the communication range is reduced after the vehicle-mounted communication system is installed can be quantified, and therefore the interference degree of the vehicle-mounted communication system can be accurately and quickly evaluated.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram illustrating an interference level test configuration of an antenna port of the vehicle-mounted communication system according to the present invention.
FIG. 3 is a schematic diagram of a configuration of sensitivity calibration test for a vehicle-mounted communication system according to the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to solve the problems in the prior art, the invention provides a quantitative evaluation method for the disturbed degree of an on-board communication system in a wave-absorbing darkroom, which comprises the following steps:
step 1, obtaining noise level test data of an antenna port of a communication system;
step 2, extracting sampling frequency points;
step 3, obtaining a sensitivity calibration value of the communication system;
step 4, generating quantized data by using a conversion formula;
and 5, evaluating the disturbed condition of the communication system.
In step 1, the noise level of the antenna port of the communication system is measured in the anechoic chamber, and the test curve is measured by using the receiver.
The test curves comprise a peak value scan curve and an average value scan curve, and the peak value scan curve and the average value scan curve are measured by using a detection mode of amplitude peak values and amplitude average values of the receiver.
In the step 2, comparing the peak value scanning curve and the average value scanning curve obtained in the step 1 with an environment curve, and defining a part which is higher than the amplitude level of the test value in the environment curve by more than 6dB as an interference area; and selecting frequency points in the frequency range of the interference area on the test curve as sampling frequency points.
Selecting frequency points with the following characteristics as sampling frequency points in a frequency range of an interference area on a test curve;
the sampling frequency point at least has the following two characteristics at the same time:
within the interference region frequency range;
peak amplitude higher than center frequency F0The peak amplitude of plus or minus 25kHz is more than 3 dB;
the difference between the peak and mean amplitudes is within 6 dB.
In step 3, the communication system sensitivity is calibrated in the anechoic chamber under the conditions of the non-interference environment and the loading interference environment, and the communication system sensitivity calibration values in the two states are recorded.
In the step 4, the sampling frequency point selected in the step 2 and the sensitivity of the communication system measured in the step 3 are used as input conditions, and a value X, Y generated by a conversion formula of X-a-B, Y-a-C is used as quantized data;
wherein, A is the communication system sensitivity calibration value obtained in step 3;
b is the amplitude of the sampling frequency point selected in the step 2 on the average value scanning curve;
and C is the amplitude of the sampling frequency point selected in the step 2 on the peak value scanning curve.
After the quantized data X, Y are sorted, the quantized data X, Y in an interference-free environment and a loading interference environment are respectively compared, and the interference situation of the communication system is judged by comparing the requirements in the evaluation criterion:
TABLE 1 evaluation criteria for disturbed conditions of a communication system
| Corresponding sensitivity value range | X+Y | Rating of evaluation | Effect of communication |
| -107～-113dBm | 235～250 | 1 | Is very good |
| -102～-107dBm | 205～235 | 2 | In general |
| -96～-102dBm | 160～205 | 3 | Is poor |
| ≥-96dBm | ≤160 | 4 | Very poor |
Example 1
In the embodiment, the evaluation method for quantifying the disturbed degree of the vehicle-mounted communication system in the wave-absorbing darkroom is summarized through a large amount of data, and the rule between the sensitivity and the level test and result of the antenna port is summarized. The formed rule can simplify the testing process, improve the testing accuracy of the communication system and quickly and quantitatively show the performance change of the installed communication system.
The specific implementation mode comprises the following steps:
the first step is as follows: it is checked whether the in-vehicle communication system has been correctly installed and operated in a normal state, and whether all connectors have been connected without damaged cables. Determining vehicle-mounted communication system parameters including parameters such as working frequency range, communication frequency point interval, bandwidth, sensitivity range, signal-to-noise ratio, radio frequency output power and the like;
the second step is that: and carrying out interference level test on the antenna port of the vehicle-mounted communication system. The possible radiation interference emission in the communication frequency band is measured by connecting a measuring receiver with a vehicle-mounted communication system antenna as a receiving antenna in a anechoic chamber, and the test configuration is shown in figure 2. And connecting a receiving signal port of the vehicle-mounted antenna to a measuring receiver, and performing frequency sweep test in a communication frequency range of the vehicle-mounted communication system and recording results (peak value and mean value spectrum curves).
The third step: according to a frequency spectrum curve obtained by an antenna port test, selecting a region with stronger interference in a measurement result and selecting a frequency point with higher amplitude in the region as a frequency point generating interference on a communication system. The specific selection method is shown as the second step in the technical scheme.
The fourth step: and carrying out quantitative calibration verification on the sensitivity of the communication system by adopting a radio comprehensive tester. During testing, the coupling network is adjusted according to the impedance of the testing network to match the impedance, the attenuator can select the range of 20-50 dB, and the specific testing configuration is shown in FIG. 3.
The fifth step: inputting the peak value, the average value and the sensitivity calibration value of the sampling frequency point into a conversion formula in the fourth step of the technical scheme for calculation to obtain specific numerical values of X, Y.
And a sixth step: the specific values of X, Y are sorted and listed according to the order of magnitude, and the disturbed condition of the communication system is judged according to the requirement of the evaluation criterion in the fifth step of the technical scheme.
Example 2
The embodiment provides an evaluation method for quantifying the disturbed degree of a vehicle-mounted communication system in a wave-absorbing dark room, as shown in fig. 1, the method includes the following steps:
s1, obtaining noise level test data of the antenna port of the communication system;
s2, extracting a sampling frequency point as an input condition;
s3, obtaining sensitivity calibration test data of the communication system;
s4, generating quantized data by using a conversion formula;
and S5, evaluating the disturbed condition of the communication system.
Wherein, step S1 specifically includes: the test curves include a peak scan curve and an average scan curve.
Wherein, step S2 specifically includes: and according to peak value and mean value curves obtained by port scanning, screening the frequency points in all interference areas by comparing amplitude characteristics according to conditions meeting the characteristics of sampling points to obtain sampling frequency points and listing.
Wherein, step S3 specifically includes: and calibrating the sensitivity values of the communication system respectively under the interference-free environment and the interference-loading environment.
Wherein, step S4 specifically includes: using the sampling frequency points and the sensitivity data obtained in the steps S2 and S3 as input conditions, and using a conversion formula X-a-B, Y-a-C to generate quantized data as a basis for judging the interference degree of the communication system;
wherein, step S5 specifically includes: the evaluation method is to use the quantized data to judge the disturbed condition of the communication system according to the required level in the evaluation criterion.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A quantitative evaluation method for the disturbed degree of a vehicle-mounted communication system in a wave-absorbing darkroom is characterized by comprising the following steps:
step 1, obtaining noise level test data of an antenna port of a communication system;
step 2, extracting sampling frequency points;
step 3, obtaining a sensitivity calibration value of the communication system;
step 4, generating quantized data by using a conversion formula;
step 5, evaluating the disturbed condition of the communication system;
in the step 2, comparing the peak value scanning curve and the average value scanning curve obtained in the step 1 with an environment curve, and defining a part which is higher than the amplitude level of the test value in the environment curve by more than 6dB as an interference area; selecting frequency points in the frequency range of the interference area on the test curve as sampling frequency points;
selecting frequency points with the following characteristics as sampling frequency points in the frequency range of an interference area on a test curve;
the sampling frequency point at least has the following two characteristics at the same time:
(1) within the interference region frequency range;
(2) peak amplitude higher than center frequency F0The peak amplitude of plus or minus 25kHz is more than 3 dB;
(3) the difference between the peak value and the mean value amplitude is within 6 dB;
in the step 3, calibrating the sensitivity of the communication system in the anechoic chamber under the conditions of an interference-free environment and an interference-loaded environment respectively, and recording the calibration values of the sensitivity of the communication system in two states;
in the step 4, the sampling frequency point selected in the step 2 and the sensitivity of the communication system measured in the step 3 are used as input conditions, and a conversion formula X ═ a | -B, Y ═ a | -C is used to generate X, Y values as quantized data;
a is the communication system sensitivity calibration value obtained in step 3;
b is the amplitude of the sampling frequency point selected in the step 2 on the average value scanning curve; and C is the amplitude of the sampling frequency point selected in the step 2 on the peak value scanning curve.
2. The method for quantitatively evaluating the disturbed degree of the vehicle-mounted communication system in the wave-absorbing darkroom of claim 1, wherein in the step 1, the noise level of the antenna port of the communication system is measured in the anechoic darkroom, and a test curve is measured by using a receiver.
3. The method for quantitatively evaluating the disturbed degree of the vehicle-mounted communication system in the wave-absorbing dark room as claimed in claim 2, wherein the test curves comprise a peak value scan curve and an average value scan curve, and the peak value scan curve and the average value scan curve are measured by using a detection mode of amplitude peak value and amplitude average value of the receiver.
4. The method for quantitatively evaluating the disturbed degree of the wave-absorbing darkroom vehicle-mounted communication system of claim 1,
after the quantized data X, Y are sorted, the quantized data X, Y in the interference-free environment and the loading interference environment are compared respectively, and the interference situation of the communication system is judged by comparing the requirements in the evaluation criterion:
evaluation criterion of disturbed condition of communication system:
when the corresponding sensitivity value range is in a range of-107 dBm to-113 dBm and X + Y is 235-250, the evaluation grade is 1, and the communication effect is very good;
when the corresponding sensitivity value range is in a range of-102 dBm to-107 dBm and X + Y is 205-235, the evaluation grade is 2, and the communication effect is general;
when the corresponding sensitivity value range is in a range of-96 dBm to-102 dBm and X + Y is 160-205, the evaluation grade is 3, and the communication effect is poor;
when the corresponding sensitivity value range is larger than or equal to-96 dBm and X + Y is smaller than or equal to 160, the evaluation grade is 4, and the communication effect is very poor.
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