CN115242329A - Signal interference detection system and vehicle - Google Patents
Signal interference detection system and vehicle Download PDFInfo
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- CN115242329A CN115242329A CN202210930891.5A CN202210930891A CN115242329A CN 115242329 A CN115242329 A CN 115242329A CN 202210930891 A CN202210930891 A CN 202210930891A CN 115242329 A CN115242329 A CN 115242329A
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- 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
Abstract
The embodiment of the invention discloses a signal interference detection system and a vehicle, wherein the system comprises: the attenuator is used for attenuating the intentional emission signal output by the vehicle-mounted system; the comprehensive tester is used for amplifying the intentional emission signal output by the vehicle-mounted system; the coupling capacitor is used for coupling and outputting the intentional emission signal output by the vehicle-mounted system or processed by the attenuator or the comprehensive tester; the spectrum analyzer is used for detecting the transmission power of the intentional transmission signal and detecting the signal state of the sensitive signal terminal. The embodiment of the invention adjusts the transmitting power of the intentional transmitting signal for many times through the attenuator and the comprehensive measuring instrument, and then determines whether the sensitive signal terminal is interfered by the current intentional transmitting signal or not and determines the transmitting power range in which the intentional transmitting signal generates interference through the change condition of the state parameter of the signal output by the sensitive signal terminal detected by the frequency spectrometer, thereby improving the efficiency and the accuracy of signal interference detection.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a signal interference detection system and a vehicle.
Background
With the continuous development of automobile intellectualization, more and more functional modules using high-speed signals are integrated in a single vehicle-mounted electronic product. So that the mutual interference generated by the functional modules in the product is more and more serious. When designing electronic products, the problem of mutual interference between different emission sources is considered, wherein the problem of interference of intentionally emitted signals such as network communication modules on other internal sensitive signals is serious.
However, the communication or electromagnetic environment of the automobile is becoming more and more complex, and especially new technologies of new energy, car networking, intelligent driving and other automobile industries are rapidly coming and being put into use in large quantities, and the communication or electromagnetic environment of the automobile is becoming more and more complex. However, at present, according to the complex electromagnetic environment of the automobile, it is difficult to test the signal anti-interference capability of the vehicle-mounted system in the automobile. Therefore, how to detect signal interference inside an on-board system of an automobile is an urgent problem to be solved.
Disclosure of Invention
In a first aspect, the present invention provides a signal interference detection system, including:
the attenuator is used for attenuating an intentional transmitting signal transmitted by the network module of the vehicle-mounted system through the coaxial cable;
the comprehensive tester is used for amplifying the transmitting power of the intentional transmitting signal transmitted by the network module through the coaxial cable;
the coupling capacitor is used for coupling and outputting the intentional transmitting signal transmitted by the coaxial cable after the network module is processed by the attenuator or the comprehensive tester;
and the frequency spectrograph is used for detecting the transmission power of the intentional transmission signal output by the coupling capacitor and detecting the signal state of a sensitive signal terminal of the vehicle-mounted system so as to determine whether the internal equipment of the vehicle-mounted system is interfered by the signal of the network module.
In an optional embodiment, the determining whether the internal device of the vehicle-mounted system is interfered by the signal of the network module includes:
and when any state parameter of the signal output by the sensitive signal terminal changes, determining that the internal equipment of the vehicle-mounted system is interfered by the signal of the network module.
In an alternative embodiment, the spectrometer is further configured to determine, based on the transmission power of the detected intentional transmission signal, a transmission power range in which the intentional transmission signal can interfere with the sensitive signal terminal.
In an optional embodiment, when performing signal interference detection, the comprehensive tester is further configured to amplify an intentional transmission signal output by the network module, and output the amplified intentional transmission signal to the attenuator;
the attenuator is also used for carrying out attenuation processing on the amplified intentional emission signal and then transmitting the intentional emission signal to the coupling capacitor.
In an alternative embodiment, the method further comprises:
and the power supply module is used for supplying power to the signal interference detection system.
In an alternative embodiment, the power supply module comprises:
the power supply is used for supplying power to the signal interference detection system;
and the filter is used for carrying out filtering processing on the power supply.
In an alternative embodiment, the method further comprises:
if the sensitive signal terminal is a loudspeaker signal terminal, the loudspeaker signal terminal is used for connecting the loudspeaker and outputting an audio signal;
and if the sensitive signal terminal is a camera signal terminal, the camera signal terminal is used for connecting a camera and outputting an image signal.
In an alternative embodiment, the filter is a power filter with an insertion loss of no less than 40 db.
In an alternative embodiment, the coupling capacitance is at least one, and the capacitance of the coupling capacitance ranges from 1 to 4.7nF;
the coaxial cable is a cable with an SMA interface, and the weaving density of a shielding layer of the coaxial cable is not less than 95%.
In a second aspect, the present invention provides a vehicle, comprising an onboard system and a signal interference detection system as described above.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a signal interference detection system which comprises an attenuator, a comprehensive tester, a coupling capacitor and a frequency spectrometer. The embodiment of the invention adjusts the transmitting power of the intentional transmitting signal for many times through the attenuator and the comprehensive measuring instrument, and then determines whether the sensitive signal terminal is interfered by the current intentional transmitting signal or not through the change condition of any state parameter of the signal output by the sensitive signal terminal detected by the frequency spectrometer, and determines the transmitting power range in which the intentional transmitting signal can generate interference on the sensitive signal terminal, thereby improving the efficiency and the accuracy of signal interference detection.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
FIG. 1 shows a schematic view of a vehicle according to an embodiment of the invention;
fig. 2 is a schematic diagram showing a structure of a signal interference detection system according to an embodiment of the present invention;
fig. 3 shows another schematic structural diagram of a signal interference detection system in an embodiment of the present invention.
Description of the main element symbols: 10-a network module; 20-comprehensive measuring instrument; 30-an attenuator; 40-coupling capacitance; 50-a spectrometer; 60-sensitive signal terminals; 70-a power supply module; 71-a power supply source; 72-a filter; 80-coaxial cable; 1-signal interference detection system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are intended to indicate only specific features, numerals, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the presence of or adding to one or more other features, numerals, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as terms defined in a commonly used dictionary) will be construed to have the same meaning as the contextual meaning in the related art and will not be construed to have an idealized or overly formal meaning unless expressly so defined in various embodiments of the present invention.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a vehicle, which includes an on-board system and a signal interference detection system 1, where the on-board system includes at least one sensitive signal terminal 60 and at least one network module 10. An in-vehicle system is any system or device that can provide functional services. For example, if the in-vehicle system is an in-vehicle entertainment system, the sensitive signal terminals 60 include, but are not limited to, speaker signal terminals and camera signal terminals, and the network module 10 includes, but is not limited to, a car communication module and a car networking module. Wherein the network module 10 can output an intentional transmission signal, such as a network communication signal.
However, in the vehicle-mounted system, the network module 10 outputting the intentional transmission signal is an intentional transmission interference source, which is a device dedicated to radiate electromagnetic energy, such as a broadcasting, television, communication, radar, navigation and other transmission equipment, and works by transmitting electromagnetic energy of useful signals to the space, and they will constitute functional interference to electronic systems or equipment that do not need these signals, and also be an important pollution source of the electromagnetic environment.
The sensitive signal terminal 60 can be connected to a corresponding device and output a corresponding signal to the connected device, for example, when the sensitive signal terminal 60 is a speaker signal terminal, the signal output by the sensitive signal terminal 60 is an audio signal, and when the sensitive signal terminal 60 is a camera signal terminal, the signal output is an image signal.
In the vehicle-mounted system, the intentional transmission signal can generate signal interference on the sensitive signal terminal 60, but because the electromagnetic environment in the vehicle-mounted system is complex, it is difficult to detect the interference between the signals through the internal structure of the vehicle-mounted system.
In order to detect interference between signals in an on-board system, the present embodiment provides a signal interference detecting system 1, referring to fig. 1, where the signal interference detecting system 1 includes:
the attenuator 30 is used for attenuating an intentional transmitting signal transmitted by the network module 10 of the vehicle-mounted system through the coaxial cable 80; the comprehensive tester 20 is used for amplifying the transmission power of the intentional transmission signal transmitted by the network module 10 of the vehicle-mounted system through the coaxial cable 80; the coupling capacitor 40 is used for coupling and outputting the intentional transmission signal transmitted by the coaxial cable 80 after the network module 10 is processed by the attenuator 30 or the comprehensive tester 20; the spectrometer 50 is configured to detect the transmission power of the intentional transmission signal output by the coupling capacitor 40 and detect a signal state of the sensitive signal terminal 60 of the vehicle-mounted system, so as to determine whether the device inside the vehicle-mounted system is interfered by the signal of the network module, that is, determine whether the sensitive signal terminal 60 inside the vehicle-mounted system is interfered by the signal of the network module 10.
Illustratively, the coaxial cable 80 is used to transmit the intentional transmission signal output by the network module 10 and the signal output by the sensitive signal terminal 60. For example, the coaxial cable adopts a cable with an SMA interface, and the weaving density of the shielding layer of the cable is not less than 95%, so that the coaxial cable is ensured to meet the impedance requirement of 50 ohms.
In this embodiment, an antenna port of a transmission signal of the network module 10 in the vehicle system is connected to the attenuator 30, and an intentional transmission signal output by the network module 10 is attenuated by the attenuator 30 and amplified by the integrated instrument 20, and then is coupled by the coupling capacitor 40 and output. Wherein the length of the coaxial cable 80 between the coupling capacitor 40 and each device to receive the intentional transmission signal is not more than 50mm, so as to reduce the attenuation of the intentional transmission signal during transmission.
In the present embodiment, it is determined whether the intentional transmission signal generates signal interference on the sensitive signal terminal 60 according to the state parameter and the variation of the signal output from the sensitive signal terminal 60 detected by the spectrometer 50. If any state parameter of the waveform, the amplitude and the frequency corresponding to the signal output by the sensitive signal terminal 60 changes, it is determined that the sensitive signal terminal 60 is interfered by the intentional transmission signal output by the network module.
The coupling capacitor 40 couples the intentional transmission signal and outputs the intentional transmission signal approximately without attenuation. In addition, the coupling capacitor 40 can cut off the unwanted dc signal in the intentional transmitting signal to output the wanted ac signal during the coupling process. Meanwhile, the spectrometer 50 may observe the state parameter of the signal output by the sensitive signal terminal 60, so as to determine whether the intentional transmission signal output by the network module 10 interferes with the sensitive signal terminal 60 according to the state parameter of the signal output by the sensitive signal terminal 60 detected by the spectrometer 50. For example, the signal interference detection system 1 may select at least one coupling capacitor 40, the coupling capacitor 40 having a capacitance in the range of 1-4.7nF.
Further, the present embodiment may also adjust the magnitude of the transmission power of the intentional transmission signal multiple times through the integrated meter 20 and/or the attenuator 30, and then determine the transmission power range in which the intentional transmission signal interferes with the sensitive signal terminal 60 according to the interference situation of the intentional transmission signal with different transmission powers on the sensitive signal terminal 60.
Exemplarily, the attenuator 30 and/or the integrator 20 adjust the transmission power of the intentional transmission signal output by the network module 10, and then the adjusted intentional transmission signal is coupled and output by the coupling capacitor 40, and the spectrum analyzer 50 detects the state parameter of the signal output by the sensitive signal terminal 60 and the transmission power of the coupled intentional transmission signal, so as to determine whether the sensitive signal terminal 60 is interfered by the intentional transmission signal, and determine the transmission power of the current intentional transmission signal. During the adjustment of the transmitting power, the transmitting power can be gradually and fixedly increased or decreased according to a preset fixed value, that is, the adjusted transmitting powers are in an arithmetic or geometric series form, and the preset fixed value can be set according to actual conditions, which is not limited herein; alternatively, when the transmission power is adjusted, the value of the transmission power thereof is arbitrarily increased or decreased in a random quantity.
Optionally, after the network module 10 of the vehicle-mounted system outputs the intentional transmission signal, the signal interference detection system 1 firstly couples and outputs the intentional transmission signal through the coupling capacitor 40, and the frequency spectrograph 50 detects a state parameter of the signal of the sensitive signal terminal 60 to determine whether the current transmission power of the intentional transmission signal can generate interference on the sensitive signal terminal 60.
Optionally, after the network module 10 of the vehicle-mounted system outputs the intentional transmission signal, the signal interference detection system 1 firstly attenuates or amplifies the intentional transmission signal through the attenuator 30 or the amplifier, and then couples and outputs the attenuated or amplified intentional transmission signal through the coupling capacitor 40, and the spectrum analyzer 50 detects a state parameter of the signal of the sensitive signal terminal 60 to determine whether the current transmission power of the attenuated or amplified intentional transmission signal can generate interference on the sensitive signal terminal 60.
Optionally, during signal interference detection, after the network module 10 of the vehicle-mounted system outputs the intentional transmitting signal, the signal interference detection system 1 may amplify the intentional transmitting signal by the integrated detector 20, output the intentional transmitting signal to the attenuator 30, attenuate the intentional transmitting signal by the attenuator 30, and transmit the intentional transmitting signal to the coupling capacitor 40 for coupling output; or, the signal interference detection system 1 firstly attenuates the intentional transmission signal output by the network module 10 through the attenuator 30 and then outputs the attenuated intentional transmission signal to the comprehensive tester 20, and then amplifies the intentional transmission signal through the comprehensive tester 20 and transmits the amplified intentional transmission signal to the coupling capacitor 40 for coupling and outputting.
Exemplarily, the comprehensive tester 20 or the attenuator 30 amplifies or attenuates the transmission power of the intentional transmission signal output by the network module 10, and the amplified or attenuated intentional transmission signal is coupled by the coupling capacitor 40 and then output, so as to determine whether the current transmission power of the intentional transmission signal can generate interference on the sensitive signal terminal 60 according to the state parameter of the signal output by the sensitive signal terminal 60 detected by the spectrometer 50. Further, when the above steps are performed a plurality of times, the minimum value and the maximum value of the transmission power of the intentional transmission signal that can generate interference on the sensitive signal terminal 60 may be correspondingly determined, and thus, the transmission power range in which the intentional transmission signal can generate interference on the sensitive signal terminal 60 may be determined. Specifically, the intentional transmission signal may be attenuated multiple times to obtain multiple intentional transmission signals with sequentially reduced transmission powers so as to determine a minimum transmission power corresponding to the intentional transmission signal when the intentional transmission signal can interfere with the sensitive signal terminal 60, and then the intentional transmission signal may be amplified multiple times to obtain multiple intentional transmission signals with sequentially increased transmission powers so as to determine a maximum transmission power corresponding to the intentional transmission signal when the intentional transmission signal can interfere with the sensitive signal terminal 60; or, the intentional transmission signal is amplified for a plurality of times to determine the maximum transmission power capable of generating interference, and then the intentional transmission signal is attenuated for a plurality of times to determine the minimum transmission power capable of generating interference.
Optionally, the coupling capacitor 40 may couple and output the intentional transmission signal output by the network module 10 of the vehicle-mounted system, and determine whether the current transmission power of the intentional transmission signal without amplification or attenuation processing may interfere with the sensitive signal terminal 60 according to the state parameter of the sensitive signal terminal 60 detected by the spectrometer 50.
Further, if the state parameter of the sensitive signal terminal 60 detected by the spectrometer 50 changes at this time, it is determined that the intentional transmission signal may interfere with the sensitive signal terminal 60 at the transmission power, so that the attenuator 30 and the integrator 20 adjust the transmission power of the intentional transmission signal to determine the maximum transmission power and the minimum transmission power at which the intentional transmission signal may interfere with the sensitive signal terminal 60. Specifically, the maximum and minimum transmission powers at which the intentional transmission signal interferes may be determined by amplifying or attenuating the transmission power of the intentional transmission signal a plurality of times by the comprehensive tester 20 or the attenuator 30; alternatively, the transmission power of the intentional transmission signal may be amplified to the preset maximum transmission power by the comprehensive measuring instrument 20, and then the intentional transmission signal with the maximum transmission power may be attenuated by the attenuator 30 for multiple times to determine the maximum and minimum transmission powers when the intentional transmission signal generates interference.
Preferably, after the network module 10 outputs the intentional transmission signal, the comprehensive tester 20 amplifies the intentional transmission signal and amplifies the intentional transmission signal to a preset maximum transmission power, then couples the intentional transmission signal with the maximum transmission power, the sensitive signal terminal 60 receives the coupled intentional transmission signal, and determines whether the intentional transmission signal interferes with the target signal output by the sensitive signal terminal 60 according to a state signal output by the sensitive signal terminal 60 after receiving the intentional transmission signal. After the target signal output by the sensitive signal terminal 60 receives the intentional transmission signal, if any one of a waveform, an amplitude and a frequency corresponding to the target signal changes, it is determined that the target signal output by the sensitive signal terminal 60 is interfered by the intentional transmission signal; further, after the intentional transmission signal is amplified to the maximum transmission power, the amplified intentional transmission signal is attenuated once, that is, the transmission power of the intentional transmission signal is adjusted to be slightly smaller than the maximum transmission power, whether the attenuated intentional transmission signal can interfere with the sensitive signal terminal 60 is judged, and the above steps are repeatedly performed to determine the transmission power range corresponding to the intentional transmission signal when the intentional transmission signal can interfere with the sensitive signal terminal 60.
Specifically, after the network module 10 outputs the intentional transmission signal, the comprehensive tester 20 amplifies the intentional transmission signal until the transmission power of the intentional transmission signal reaches the preset maximum transmission power, and outputs the intentional transmission signal, and the frequency spectrograph 50 detects the state parameter of the signal output by the current sensitive signal terminal 60, and determines whether the sensitive signal terminal 60 is interfered by the intentional transmission signal at this time. If the sensitive signal terminal 60 is not interfered by the intentional transmission signal, the attenuator 30 attenuates the amplified intentional transmission signal, and outputs the attenuated intentional transmission signal, the spectrometer 50 detects a state parameter of a signal output by the current sensitive signal terminal 60, and if it is determined that the current sensitive signal terminal 60 is interfered by the intentional transmission signal, the transmission power of the current intentional transmission signal is used as the maximum transmission power capable of generating interference. Meanwhile, the attenuator 30 performs attenuation processing on the intentional transmission signal again, determines whether the sensitive signal terminal 60 is interfered by the intentional transmission signal at this time, and if the target signal is not interfered by the intentional transmission signal, takes the transmission power of the intentional transmission signal at this time as the minimum transmission power capable of generating interference. If the sensitive signal terminal 60 is interfered by the intentional transmission signal, the attenuator 30 again performs attenuation processing on the intentional transmission signal, and repeats the above steps until the sensitive signal terminal 60 is not interfered by the intentional transmission signal, and the transmission power corresponding to the intentional transmission signal is taken as the minimum transmission power capable of generating interference.
For example, the network module 10 outputs an intentional transmission signal M1, the comprehensive tester 20 amplifies the transmission power of the intentional transmission signal M1 to the maximum transmission power, and outputs an intentional transmission signal M2, the intentional transmission signal M2 may be coupled by the coupling capacitor 40 and then output, and if the spectrometer 50 detects that the waveform, the amplitude, or the frequency of the signal output by the current sensitive signal terminal 60 changes, it is determined that the signal M2 interferes with the sensitive signal terminal 60. Then, the attenuator 30 attenuates the signal M2 once to obtain an intentionally transmitted signal M3, the signal M3 is coupled by the coupling capacitor 40 and then output, when it is determined by the spectrometer 50 that the signal M3 can also interfere with the sensitive signal terminal 60, the attenuator 30 attenuates the signal M3 once to obtain an intentionally transmitted signal M4, and the signal M4 is coupled by the coupling capacitor 40 and then output, wherein the transmission power of the signals M2, M3, and M4 is arranged in the order from large to small: m2, M3, M4, and the transmit power of M4 may be greater than, equal to, or less than the transmit power of M1; when it is determined that the signal M4 cannot generate interference on the sensitive signal terminal 60, according to the transmission powers of the above several intentional transmission signals capable of generating interference on the sensitive signal terminal 60, a transmission power range of the intentional transmission signal capable of generating interference on the sensitive signal terminal 60 is determined, where a maximum value of the transmission power is the transmission power of the signal M2, and a minimum value is the transmission power of the signal M3, that is, a transmission power range of the intentional transmission signal capable of generating interference on the sensitive signal terminal 60 is [ PM3, PM2], and P represents the transmission power.
The coupling capacitor 40 used in the present embodiment is also called electric field coupling or electrostatic coupling, which is a coupling manner generated due to the existence of the distributed capacitance. The coupling capacitor 40 enables a strong current system and a weak current system to be coupled and isolated through a capacitor, a high-frequency signal channel is provided, power frequency current is prevented from entering the weak current system, and personal safety is guaranteed. The coupling capacitor 40 is connected in the AC circuit, the voltage of the circuit connected with one pin gradually rises, charges are gradually accumulated on the electrode plate, and when the voltage of the circuit connected with the pin falls, the charges accumulated when the potential is high are returned to the circuit. The same is true of the other end. The capacitor is insulated, no current passes through the whole capacitor, but the phenomenon that the capacitor accumulates and releases charges along with the increase and decrease of the potential causes people to mistakenly assume that current passes through the capacitor. Thus, it can isolate the direct current and couple the alternating current signal in the form of a potential that rises and falls across it for transmission to other circuit elements. The coupling capacitor 40 is used for allowing an alternating current signal to normally pass through and blocking a direct current of the amplifying circuit at the previous stage, so that the working point of the amplifying circuit at the next stage is not influenced. Because the two polar plates of the capacitor are not provided with a direct current path, direct current cannot flow; two polar plates of the capacitor can store electric charge, the positive half cycle of the alternating current charges the capacitor, and the negative half cycle discharges the capacitor first, so that the continuous charging and discharging is equivalent to the current flowing through the capacitor.
Optionally, the present embodiment may further employ a coupler to couple the intentionally transmitted signal, where the coupler includes, but is not limited to, a microstrip line, a lumped parameter, a transmission line transformer, and the like.
Optionally, the attenuator 30 may be an amplitude-adjustable step attenuator 30, so that by adjusting the resistance characteristic, the intentionally-transmitted signal passes through the attenuator 30 to generate a certain amount of attenuation or an adjustable attenuation, so as to meet the requirement of the load or the next-stage network on the amplitude of the input signal during normal operation. For example, the attenuator 30 may also be a radio frequency step attenuator 30.
Optionally, in this embodiment, it may also be determined whether the transmission power of the intentional transmission signal meets the requirement or whether the signal interference detection apparatus works normally by using the transmission power of the intentional transmission signal detected by the frequency spectrometer 50; for example, if the transmission power of the intentional transmission signal output by the network module 10 is 33db, the intentional transmission signal is attenuated by the attenuator 30 by 10db and then input to the sensitive signal terminal 60, and at this time, if the transmission power of the attenuated intentional transmission signal detected by the spectrometer 50 is less than 23db (it should be greater than or equal to 23db after being attenuated by 10 db), it indicates that the signal interference detection apparatus is abnormal, and it can be further determined whether the attenuator 30 is faulty.
Preferably, as shown in fig. 2, the second structure of the signal interference detecting system 1 includes a network module 10, a sensitive signal terminal 60, two coupling capacitors 40, an integrated meter 20, an attenuator 30, and a spectrum analyzer 50; the network module 10 outputs an intentional transmission signal, which may be respectively passed through the integrated tester 20 and/or the coupling capacitor 1 and/or the attenuator 30, and then output after being coupled in the coupling capacitor 1. In this process, the intentional transmission signal output by the network module 10 may be first accessed to any one of the integrated instrument 20, the coupling capacitor 1, and the attenuator 30, and output after being processed correspondingly, and before being accessed to the coupling capacitor 2, the intentional transmission signal may be accessed to the coupling capacitor 2 after being processed correspondingly by one or more of the integrated instrument 20, the coupling capacitor 40, and the attenuator 30, and output after being coupled from the coupling capacitor 2, and the transmission power of the intentionally transmission signal after being coupled may also be detected by using the spectrum analyzer 50.
The present embodiment may employ the integrated meter 20 to adjust the transmission power of the intentional transmission signal output by the network module 10 to the maximum achievable transmission power, and detect the power peak of the intentional transmission signal in real time during transmission through the spectrum analyzer 50. The present embodiment may also adjust the step attenuator 30 such that the transmission power of the intentional transmission signal measured by the spectrometer 50 is less than the maximum transmission power, e.g., 10dB less than the maximum transmission power. Therefore, the signal interference detection device provided by the present embodiment can realize dynamic adjustment of the transmission power of the intentional transmission signal, wherein the maximum transmission power of the intentional transmission signal is determined by the product specification.
As a feasible implementation manner, when the signal interference detection system 1 dynamically adjusts the transmission power of the intentional transmission signal, it may be determined whether the vehicle-mounted system is interfered by the intentional transmission signal by observing and recording the current function and performance state of the vehicle-mounted system including the sensitive signal terminal 60 to be detected, and if the vehicle-mounted system has a reduced function or performance when outputting the intentional transmission signal, it indicates that the intentional transmission signal interferes with the vehicle-mounted system and the sensitive signal terminal 60 thereof, and then the transmission power of the intentional transmission signal may be adjusted by the comprehensive measurement instrument 20 or the attenuator 30, so as to determine the transmission power range of the intentional transmission signal that can generate interference.
Optionally, as shown in fig. 3, the signal interference detecting system 1 further includes a power supply module 70 for supplying power to each component in the signal interference detecting system 1, where the power supply module 70 is composed of an ac or dc power supply 71 and a filter 72, for example, the filter 72 is a power supply filter 72 with an insertion loss not less than 40db, so as to ensure that the power supply of the signal interference detecting apparatus is pure.
In the embodiment, whether the sensitive signal terminal 60 is interfered by the current intentional transmission signal is determined according to the change condition of any state parameter of the signal output by the sensitive signal terminal 60 detected by the frequency spectrograph 50, so that the efficiency and accuracy of signal interference detection are improved; furthermore, in this embodiment, the magnitude of the transmission power of the intentional transmission signal can be adjusted multiple times through the attenuator 30 and the comprehensive measuring instrument 20 to determine the transmission power range within which the intentional transmission signal can interfere with the sensitive signal terminal 60, so that the interference capability of the signal output by the product on other products is reduced in the subsequent function design process of the vehicle-mounted electronic products, and the mutual interference of the signals between the vehicle-mounted electronic products is avoided, so as to ensure the simultaneous or combined use of the vehicle-mounted electronic products, and the staggered use is not required, thereby improving the practicability, effectiveness and safety of the vehicle-mounted electronic products, and further improving the experience effect of the user.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A signal interference detection system, comprising:
the attenuator is used for attenuating an intentional transmitting signal transmitted by the network module of the vehicle-mounted system through the coaxial cable;
the comprehensive tester is used for amplifying the transmitting power of the intentional transmitting signal transmitted by the network module through the coaxial cable;
the coupling capacitor is used for coupling and outputting the intentional transmitting signal transmitted by the coaxial cable after the network module is processed by the attenuator or the comprehensive tester;
and the frequency spectrograph is used for detecting the transmission power of the intentional transmission signal output by the coupling capacitor and detecting the signal state of a sensitive signal terminal of the vehicle-mounted system so as to determine whether the internal equipment of the vehicle-mounted system is interfered by the signal of the network module.
2. The system according to claim 1, wherein the determining whether the internal device of the vehicle-mounted system is interfered by the signal of the network module comprises:
and when any state parameter of the signal output by the sensitive signal terminal changes, determining that the internal equipment of the vehicle-mounted system is interfered by the signal of the network module.
3. The signal interference detection system of claim 1, wherein the spectrometer is further configured to determine a transmission power range in which the intentional transmission signal can cause interference to the sensitive signal terminal, based on the transmission power of the detected intentional transmission signal.
4. The signal interference detecting system according to claim 1, wherein the comprehensive tester is further configured to amplify the intentional transmission signal output by the network module and output the amplified intentional transmission signal to the attenuator during signal interference detection;
the attenuator is also used for carrying out attenuation processing on the amplified intentional emission signal and transmitting the intentional emission signal to the coupling capacitor.
5. The signal interference detection system according to claim 1, further comprising:
and the power supply module is used for supplying power to the signal interference detection system.
6. The signal interference detection system of claim 5, wherein the power supply module comprises:
the power supply is used for supplying power to the signal interference detection system;
and the filter is used for filtering the power supply.
7. The signal interference detection system according to claim 1, further comprising:
if the sensitive signal terminal is a loudspeaker signal terminal, the loudspeaker signal terminal is used for connecting the loudspeaker and outputting an audio signal;
and if the sensitive signal terminal is a camera signal terminal, the camera signal terminal is used for connecting a camera and outputting an image signal.
8. The signal interference detection system of claim 6 wherein the filter is selected to be a power filter having an insertion loss of no less than 40 db.
9. The signal disturbance detection system according to claim 1, wherein the coupling capacitance is at least one, and a capacity of the coupling capacitance ranges from 1 nF to 4.7nF;
the coaxial cable is a cable with an SMA interface, and the weaving density of a shielding layer of the coaxial cable is not less than 95%.
10. A vehicle comprising an on-board system and a signal disturbance detection system according to any of claims 1-9.
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| CN105979534A (en) * | 2015-10-22 | 2016-09-28 | 乐视移动智能信息技术（北京）有限公司 | Method and system for detecting interference of LTE on WIFI |
| US20170194992A1 (en) * | 2016-01-04 | 2017-07-06 | Electronics And Telecommunications Research Institute | Method for enhancing performance of multi-input multi-output system on line-of-sight |
| CN114089079A (en) * | 2021-12-14 | 2022-02-25 | 北京科环世纪电磁兼容技术有限责任公司 | Anti-interference test system |
| CN114679230A (en) * | 2020-12-24 | 2022-06-28 | 海能达通信股份有限公司 | Radio frequency signal processing method and device and receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105979534A (en) * | 2015-10-22 | 2016-09-28 | 乐视移动智能信息技术（北京）有限公司 | Method and system for detecting interference of LTE on WIFI |
| US20170194992A1 (en) * | 2016-01-04 | 2017-07-06 | Electronics And Telecommunications Research Institute | Method for enhancing performance of multi-input multi-output system on line-of-sight |
| CN114679230A (en) * | 2020-12-24 | 2022-06-28 | 海能达通信股份有限公司 | Radio frequency signal processing method and device and receiver |
| CN114089079A (en) * | 2021-12-14 | 2022-02-25 | 北京科环世纪电磁兼容技术有限责任公司 | Anti-interference test system |
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