CN115514434A - Disturbance testing device and method for vehicle-mounted receiver - Google Patents
Disturbance testing device and method for vehicle-mounted receiver Download PDFInfo
- Publication number
- CN115514434A CN115514434A CN202110689268.0A CN202110689268A CN115514434A CN 115514434 A CN115514434 A CN 115514434A CN 202110689268 A CN202110689268 A CN 202110689268A CN 115514434 A CN115514434 A CN 115514434A
- Authority
- CN
- China
- Prior art keywords
- vehicle
- disturbance
- mounted receiver
- isolation
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention relates to a disturbance testing device of a vehicle-mounted receiver. The vehicle provided with the vehicle-mounted receiver is arranged in a test chamber, and the test chamber is made of wave-absorbing materials. The disturbance testing device comprises an isolation component positioned in the testing chamber and a measuring component positioned outside the testing chamber. One end of the isolation component is electrically connected to a cable of the vehicle-mounted antenna, and the isolation component is used for ground isolation of a vehicle in the AM frequency band. The measuring component is electrically connected to the other end of the isolation component and is used for measuring a disturbance signal of the vehicle-mounted receiver. The invention also relates to a disturbance testing method of the vehicle-mounted receiver.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a disturbance testing device and method of a vehicle-mounted receiver.
Background
According to antenna theory, the best reception is achieved when the antenna length is at least one quarter of the wavelength of the received signal. For AM broadcast bands, e.g. 1MHz frequencies, the corresponding quarter wavelength is 75 meters. Under actual working conditions, the whole vehicle is usually insulated from the road surface, and the size of the whole vehicle is far smaller than 75 meters. Therefore, the size of the whole vehicle does not meet the transmission characteristic of one-quarter wavelength of the AM frequency band antenna under the actual working condition.
However, in the disturbance test of the vehicle-mounted receiver, the ground where the whole vehicle is located and the ground of the test room are connected into a whole, and the whole vehicle and the peripheral equipment form a loop through the ground, so that the antenna transmission requirement (for example, the size of 75 meters) of the AM broadcast frequency band can be met. Therefore, when the test frequency band is an AM broadcast frequency band, if no corresponding measures are taken, the test result is far from the result under the actual working condition, and the actual working condition cannot be truly reflected.
Therefore, an improved test scheme is needed for the disturbance test of the vehicle-mounted receiver in the AM frequency band.
Disclosure of Invention
To solve or at least alleviate at least one of the above problems, the present invention provides a disturbance test scheme for a vehicle-mounted receiver as described below.
According to one aspect of the invention, the disturbance testing device for the vehicle-mounted receiver is provided, wherein a vehicle provided with the vehicle-mounted receiver is arranged in a testing chamber, and the testing chamber is made of wave-absorbing materials. The disturbance testing device comprises an isolation component positioned in the testing chamber and a measuring component positioned outside the testing chamber. One end of the isolation member is electrically connected to a cable of a vehicle-mounted antenna, and the isolation member is used to electrically isolate the vehicle from the measurement member in the AM band. The measuring component is electrically connected to the other end of the isolation component and is used for ground isolation of the vehicle on the AM frequency band.
In the disturbance testing device of the vehicle-mounted receiver, the isolation component comprises a coil with high attenuation performance on the AM frequency band.
In the disturbance testing device of the vehicle-mounted receiver, the isolation component comprises a coil wound on a circular magnetic ring.
In the disturbance testing device of the vehicle-mounted receiver, the circular magnetic ring wound by the coil is a ferrite core magnetic ring with high magnetic permeability.
In the disturbance testing device of the vehicle-mounted receiver, one end of the isolation member is electrically connected to the cable of the vehicle-mounted antenna via an impedance matching member.
According to another aspect of the invention, a disturbance testing method for a vehicle-mounted receiver is provided. The vehicle provided with the vehicle-mounted receiver is arranged in a test chamber, and the test chamber is made of wave-absorbing materials. The disturbance testing method comprises the following steps: the method comprises the steps of electrically connecting one end of an isolation component in the test chamber to a cable of a vehicle-mounted antenna, electrically connecting the other end of the isolation component to a measuring component outside the test chamber, and measuring a disturbance signal of the vehicle-mounted receiver by using the measuring component, wherein the isolation component is used for ground isolation of a vehicle in the AM frequency band.
In the disturbance test method of the vehicle-mounted receiver, the isolation component comprises a coil with high attenuation performance on an AM frequency band.
In the disturbance test method of the vehicle-mounted receiver, the isolation component comprises a coil wound on a circular magnetic ring.
In the disturbance test method of the vehicle-mounted receiver, the circular magnetic ring wound by the coil is a ferrite core magnetic ring with high magnetic conductivity.
In the disturbance test method of the vehicle-mounted receiver, one end of the isolation component is electrically connected to the cable of the vehicle-mounted antenna through an impedance matching component.
The above features, operation, and advantages of the present invention will become more apparent from the following description and the accompanying drawings.
Drawings
The above and other objects and advantages of the present invention will become more fully apparent from the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 shows a vehicle 1000 to which a disturbance testing apparatus of an in-vehicle receiver according to an embodiment of the present invention is applied.
Fig. 2 shows an isolation member 2000 according to an embodiment of the invention.
FIG. 3 shows a measurement layout 3000 of isolation member 310 according to one embodiment of the present invention.
Fig. 4 shows a frequency gain plot for cables before and after a spacer component connection according to one embodiment of the invention.
Fig. 5 shows a flow chart of a disturbance testing method 5000 of a vehicle-mounted receiver according to one embodiment of the invention.
FIG. 6 illustrates test results for a brushed motor condition using a disturbance test method 5000 of an in-vehicle receiver according to one embodiment of the invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. The present embodiments are provided so that this disclosure will be thorough and complete, and will fully and accurately convey the scope of the invention.
Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
Fig. 1 shows a vehicle 1000 to which a disturbance testing apparatus of an on-vehicle receiver according to an embodiment of the present invention is applied. As shown in fig. 1, a vehicle 1000 is in a test chamber formed of a wave-absorbing material 200. In the vehicle 1000, the cable 130 of the vehicle antenna 110 is electrically connected to the vehicle radio 120.
The disturbance test device comprises an isolation member 140 inside the test chamber and a measurement member 150 outside the test chamber. One end of the separation member 140 is electrically connected to the cable 130 of the vehicle antenna 110. Alternatively, as shown in fig. 1, the separation member 140 is connected to the cable 130 of the vehicle antenna 110 through the impedance matching unit 160. The other end of the isolation member 140 is electrically connected to the measurement member 150. Alternatively, as shown in fig. 1, the isolation component 140 and the measurement component 150 are connected by a cable 180 via an interface 170. The isolation component 140 is used for ground isolation of the vehicle 1000 in the AM frequency band, and the measurement component 150 is used for measuring a disturbance signal of the vehicle-mounted receiver.
Fig. 2 shows an isolation member 2000 according to an embodiment of the invention. The isolation member 200 includes a coil 210 having a high attenuation performance in the AM frequency band, thereby achieving electrical isolation of the vehicle from the ground in the AM frequency band.
"high attenuation performance" in the context of the present invention means that the gain in the AM band is significantly negative, e.g. less than-20 dB, as shown in fig. 4.
Optionally, the coil 210 is a cable coil wound on a circular magnetic ring 220. Because the coil has the choking effect (namely, when current passes through the coil, the magnetic field generated by the coil can block the magnetic field generated by the current due to self-inductance), the current can delay to pass through the coil, and therefore the effect of electrically isolating the vehicle from the ground on the AM frequency band in the disturbance test is achieved.
Alternatively, the coil 210 is constructed of a low loss coaxial cable wound 5-10 turns at uniform intervals on a circular magnetic ring 220. It is to be noted that the invention is not limited to the winding of the coil to 5-10 turns, but may be any suitable number of turns that enables an electrical isolation of the vehicle from the ground. Alternatively, the coil 210 may be a low loss coaxial cable of RG-59, RG174, or the like. It should be noted that the invention is not intended to limit the cables that make up the coils to such a type, but may be any type that enables the vehicle to be electrically isolated from the ground.
The reactance of the coil is proportional to the frequency, depending on the frequency being tested. To achieve the desired inductance (e.g., 500 ohms), a circular magnetic ring with high permeability is required.
In the context of the present invention, "high permeability" means a permeability generally greater than 2000, and preferably even close to 5000. For this purpose, a ferrite core magnet ring may be used. As an example, a circular magnetic ring manufactured by Amidon Inc. under model number FT-150A-J, with a permeability of 8370, may be used. As an alternative example, a circular magnetic ring, model FT-240A-J, manufactured by Amidon Inc. may also be used. It is to be noted that the present invention is not limited to the above-described type of magnetic ring, but may be any suitable type of magnetic ring capable of realizing a suitable inductance.
FIG. 3 shows a measurement layout 3000 of an isolation component 310 according to one embodiment of the invention. Wherein the gain S12 when the isolation member 310 is connected to the cables 330, 370 and the gain S12 when the isolation member 310 is not connected to the cables 330, 370 are measured by the network analyzer 320, respectively.
Specifically, when the positive poles of the cables 330 and 370 form a loop through the shorting bus 340 and the BNC sealing interface 350 through the isolation member 310 (as shown by the dotted line), the gain S12 of the loop at different frequencies is measured by the network analyzer 320, and the measurement result is shown as the curve a in fig. 4. As can be seen from fig. 4, when the isolation member 310 is connected in the cable 330, the gain S12 of the loop is less than-20 dB around the AM band, that is, the isolation member 310 achieves ground isolation for the AM band.
In contrast, the positive poles of the cables 330, 370 are connected by a coaxial cable 360. At this time, the gain S12 of the loop at different frequencies is measured, and the measurement result is shown as curve b in fig. 4. As can be seen from fig. 4, when the isolation member 310 is not connected in the cable 330, the gain S12 of the loop is about 0dB near the AM band, that is, when the isolation member 310 is not connected, the cable 330 has no effect of ground isolation on the AM band. In an alternative embodiment, the anodes of the cables 330, 370 may also be connected directly without the use of the coaxial cable 360.
It is to be noted that in the measurement layout 3000, the negative poles of the cables 330, 370 are always connected to each other.
Fig. 5 shows a flow chart of a disturbance testing method 5000 of a vehicle-mounted receiver according to one embodiment of the invention. The vehicle-mounted receiver and the vehicle in which the vehicle-mounted receiver is arranged are arranged in a test chamber made of wave-absorbing materials.
In step S510, one end of the partition member in the test chamber is electrically connected to the cable of the vehicle-mounted antenna. As an example, referring to fig. 1, one end of the separation member 140 in the test chamber is electrically connected to the cable 130 of the vehicle-mounted antenna 110. Wherein one end of the separation member 140 is electrically connected to the cable 130 of the vehicle antenna 110 via the impedance matching unit 160.
In step S520, the other end of the isolation member is electrically connected to a measurement member located outside the test chamber. Still referring to fig. 1, the other end of the isolation member 140 is electrically connected to the measurement member 150 located outside the test chamber via a cable 180 and through an interface 170.
In step S530, a disturbance signal of the vehicle-mounted receiver is measured using a measurement section such as the measurement section 150. Here, any signal capable of displaying the disturbance amount of the vehicle-mounted receiver on the AM frequency band, such as a voltage signal and a current signal, may be measured.
The isolation component is used for ground isolation of the vehicle on the AM frequency band. As an example, the isolation member may be a coil having a high attenuation performance in the AM band like the isolation member 200 shown in fig. 2, thereby achieving electrical isolation of the vehicle from the ground in the AM band. The coil is, for example, a cable coil wound on a circular magnetic ring. Because the coil has the choking effect (namely, when current passes through the coil, the magnetic field generated by the coil can block the magnetic field generated by the current due to self-inductance), the current can delay to pass through the coil, and therefore the ground isolation effect of the vehicle on the AM frequency band in the disturbance test is achieved. Alternatively, the coil is constructed by winding a low-loss coaxial cable 5-10 turns at uniform intervals around a circular magnetic ring. The coil may be a low-loss coaxial cable of RG-59, RG174, or the like.
FIG. 6 shows test results of a disturbance test method 5000 using an in-vehicle receiver according to one embodiment of the invention under a brushed motor condition. When the disturbance test method 5000 of the vehicle-mounted receiver is used, the network test result under the condition of the brushed motor is shown as a curve c. It can be seen from the curve c that the voltage fluctuates between-5 dB μ V and 10dB μ V in the AM frequency band, and the curve c can reflect the real situation of the vehicle-mounted receiver in the AM frequency band. By contrast, when the disturbance test method 5000 using the vehicle receiver is not used, the network test results under the brushed motor condition are shown as curve d. It can be seen from the curve d that the voltage is always less than-5 dB μ V in the AM band, and the curve d deviates significantly from the real situation of the vehicle receiver in the AM band. Therefore, the disturbance test method 5000 of the vehicle-mounted receiver is used for realizing the ground isolation in the AM frequency band and realizing the disturbance test close to the real situation.
According to the disturbance test scheme of the vehicle-mounted receiver, the isolation component is added in the test loop, so that the electrical isolation between the tested vehicle and the ground on the AM frequency band is realized, the loop is prevented from being formed between the tested vehicle and the ground, the path through which the signal passes in the AM frequency band under the test working condition is consistent with the path through which the signal passes in the AM frequency band under the actual working condition, and the disturbance test of the vehicle-mounted receiver under the AM frequency band according with the actual condition is realized.
It is to be understood that the terms "comprises" and "comprising," when used in this specification and in the claims, are intended to cover non-exclusive inclusions, unless otherwise specified.
Although only a few embodiments of the present invention have been described in detail above, those skilled in the art will readily appreciate that the present invention may be embodied in many other forms without departing from the spirit and scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. A disturbance testing device of a vehicle-mounted receiver is provided, a vehicle provided with the vehicle-mounted receiver is arranged in a testing chamber, the testing chamber is made of wave-absorbing materials, and the device is characterized in that,
the disturbance testing device comprises an isolation component positioned in the testing chamber and a measuring component positioned outside the testing chamber,
one end of the isolation component is electrically connected to a cable of the vehicle-mounted antenna, and the isolation component is used for ground isolation of a vehicle in the AM frequency band,
the measuring component is electrically connected to the other end of the isolation component and is used for measuring a disturbance signal of the vehicle-mounted receiver.
2. A disturbance test device of a vehicle-mounted receiver according to claim 1,
the isolation member includes a coil having high attenuation performance in the AM frequency band.
3. A disturbance test device for a vehicle-mounted receiver according to claim 2,
the isolation component comprises a coil wound on the circular magnetic ring.
4. A disturbance test device for a vehicle-mounted receiver according to claim 3,
the circular magnetic ring wound by the coil is a ferrite core magnetic ring with high magnetic conductivity.
5. A disturbance test device for a vehicle-mounted receiver according to claim 1,
one end of the separation member is electrically connected to the cable of the vehicle-mounted antenna via an impedance matching member.
6. A disturbance test method of a vehicle-mounted receiver is characterized in that a vehicle provided with the vehicle-mounted receiver is located in a test chamber, the test chamber is made of wave-absorbing materials, and the disturbance test method comprises the following steps:
a cable electrically connecting one end of the isolation member in the test chamber to a vehicle-mounted antenna,
electrically connecting the other end of the isolation member to a measurement member located outside the test chamber, an
Measuring disturbance signals of the vehicle-mounted receiver by using the measuring component,
the isolation component is used for isolating the vehicle on the ground in the AM frequency band.
7. A disturbance test method of a vehicle-mounted receiver according to claim 6,
the isolation member includes a coil having high attenuation performance in the AM frequency band.
8. A disturbance test method of a vehicle-mounted receiver according to claim 7,
the isolation component comprises a coil wound on the circular magnetic ring.
9. A disturbance test method of a vehicle-mounted receiver according to claim 8,
the circular magnetic ring wound by the coil is a ferrite core magnetic ring with high magnetic conductivity.
10. A disturbance test method of a vehicle-mounted receiver according to claim 6,
one end of the separation member is electrically connected to the cable of the vehicle-mounted antenna via an impedance matching member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110689268.0A CN115514434A (en) | 2021-06-22 | 2021-06-22 | Disturbance testing device and method for vehicle-mounted receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110689268.0A CN115514434A (en) | 2021-06-22 | 2021-06-22 | Disturbance testing device and method for vehicle-mounted receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115514434A true CN115514434A (en) | 2022-12-23 |
Family
ID=84500387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110689268.0A Pending CN115514434A (en) | 2021-06-22 | 2021-06-22 | Disturbance testing device and method for vehicle-mounted receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115514434A (en) |
-
2021
- 2021-06-22 CN CN202110689268.0A patent/CN115514434A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0339822A2 (en) | Transceiver testing apparatus | |
| US5633648A (en) | RF current-sensing coupled antenna device | |
| TWI478444B (en) | Cobra Antenna | |
| Beura et al. | Positioning of UHF PD sensors on power transformers based on the attenuation of UHF signals | |
| CA1137179A (en) | Antenna isolation device | |
| US20130050042A1 (en) | Cobra antenna | |
| JP2007067994A (en) | Antenna | |
| SikorSki et al. | Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers | |
| JPH0714389B2 (en) | Nuclear magnetic resonance imaging apparatus and other interface method and apparatus | |
| JP6179969B2 (en) | System for determining whether radio coverage is possible | |
| US3716806A (en) | Signal coupling apparatus utilizing hybrid transformer | |
| CN115514434A (en) | Disturbance testing device and method for vehicle-mounted receiver | |
| CN102944779A (en) | Shielding effectiveness test method of filtering and shielding integrated assembly | |
| US9000776B1 (en) | Structure characteristic impedance estimator using current probe | |
| US10290928B2 (en) | Antenna | |
| US8094083B1 (en) | Multi-band tree antenna | |
| RU2693556C1 (en) | Linear magnetic antenna for high-frequency range | |
| US7312694B2 (en) | Capacitive couplers and methods for communicating data over an electrical power delivery system | |
| US8111205B1 (en) | Mast clamp current probe (MCCP) insertion loss determining methods and systems | |
| US8311752B1 (en) | Method and apparatus to quantify mast clamp current probe effective loss on pole-mast antenna | |
| Hoek et al. | Tuned medium-band UHF PD measurement method for GIS | |
| Oganezova et al. | High Speed Cables Modeling and Simulations | |
| Choi et al. | Development of a novel tapered balun for the UWB UHF coupler | |
| Muterspaugh | Measurement of indoor antennas using GTEM cell | |
| Cavallini et al. | Characterization of patch antennae for PD detection in power cables |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |