A whole vehicle radio antenna self-compatibility test system, method and device

Abstract

The application discloses a whole vehicle radio antenna self-compatibility test system, method and device, and relates to the technical field of radio antenna testing. The system comprises an audio source, a signal generator and a transmitting antenna. The audio source is connected to the signal generator, the signal generator is connected to the transmitting antenna, the transmitting antenna is arranged at a preset distance from a vehicle radio antenna of a vehicle to be tested, the transmitting antenna and the vehicle radio antenna have the same distribution parameters based on the same reference surface, and the distance between any part of the transmitting antenna and the vehicle radio antenna is not less than the preset distance. The audio source generates a modulated signal. The signal generator takes the modulated signal as input and outputs a radio signal of a target frequency, and the radio signal is transmitted outward through the transmitting antenna. The radio signal is received by the vehicle radio antenna, demodulated by a vehicle radio of the vehicle to be tested and played. The whole vehicle electromagnetic self-compatibility test of the vehicle radio antenna is realized according to the playing condition. The system does not need to deploy a complex test system, has low cost, short cycle and can reduce invalid test.

Description

Technical Field

[0001] This invention relates to the field of vehicle-mounted equipment testing, and more specifically, to a self-compatibility testing system, method, and apparatus for a vehicle radio antenna. Background Technology

[0002] With the increasing intelligence of automobiles, the number of electronic components in vehicles is growing, and the electromagnetic environment inside the vehicle is becoming increasingly complex. Most traditional domestic and international standards only specify requirements for the vehicle's electromagnetic radiation emission levels and its immunity to harsh external electromagnetic environments. However, there is no unified or clear testing method for the self-compatibility testing of the vehicle's electromagnetic environment. Typically, OEMs analyze electromagnetic compatibility reports of the vehicle's electronic and electrical components to determine if there is potential for mutual interference between these components. Alternatively, OEMs may define simple operating conditions and use more complex equipment such as audio analyzers to analyze the data, thereby achieving self-compatibility testing of the vehicle's electromagnetic environment.

[0003] However, the above-mentioned methods for electromagnetic compatibility testing of the entire vehicle system have many problems. For example, analyzing only the electromagnetic compatibility reports of the vehicle's electronic and electrical components is highly dependent on the data, making it difficult to reproduce the actual operating environment of the vehicle. This cannot guarantee that electromagnetic compatibility issues will not occur during actual operation and carries the risk of invalid testing. Analyzing data using other complex equipment such as audio analyzers involves complex setups, numerous connected devices, high prices, long maintenance cycles, and high costs. In conclusion, neither of these testing methods can achieve efficient testing and verification; instead, they prolong the development cycle of vehicle design verification. Summary of the Invention

[0004] This invention provides a vehicle radio antenna self-compatibility testing system, method, and apparatus to overcome at least one problem existing in the prior art.

[0005] According to a first aspect of the embodiments of this specification, a vehicle radio antenna self-compatibility test system is provided, comprising: an audio source, a signal generator, and a transmitting antenna;

[0006] The audio source is connected to the signal generator, the signal generator is connected to the transmitting antenna, the transmitting antenna is set at a preset distance from the vehicle radio antenna of the vehicle under test, and the transmitting antenna and the vehicle radio antenna have the same distribution parameters based on the same reference plane, and the distance between any part of the transmitting antenna and the vehicle radio antenna is not less than the preset distance;

[0007] The audio source is used to generate a modulation signal;

[0008] The signal generator is used to take the modulated signal as input and output a radio signal at the target frequency;

[0009] The radio signal at the target frequency is transmitted outward through the transmitting antenna and received by the vehicle radio antenna. It is then demodulated by the vehicle radio of the vehicle under test and played back. Based on the playback, the electromagnetic self-compatibility test of the vehicle radio antenna is performed.

[0010] Optionally, the preset distance is 1m.

[0011] Optionally, the audio source is an audio playback device with an AUX interface.

[0012] Optionally, the audio source inputs the modulation signal into the signal generator via a BNC coaxial cable.

[0013] Optionally, the signal generator is capable of external modulation and has an output frequency range of 0.53 to 108 MHz.

[0014] Optionally, the maximum frequency deviation of the signal generator shall not exceed 500kHz, and the output impedance shall be 50Ω.

[0015] Optionally, the target field strength is a typical value of the field strength of a radio broadcast in the near field.

[0016] According to a second aspect of the embodiments of this specification, a method for testing the self-compatibility of a vehicle radio antenna is provided, comprising:

[0017] Establish a vehicle radio antenna self-compatibility test system as described in any of the technical solutions in the first aspect;

[0018] The set voltage value that the signal generator needs to be set under the target field strength is calculated according to formulas (1), (2), (3) and (4), and the output voltage of the signal generator is adjusted to the set voltage value, wherein the target field strength is the preset test field strength;

[0019]

[0020]

[0021]

[0022]

[0023] Where a is the field strength value at the base of the vehicle radio antenna, b is the target field strength, and U A U is the actual output voltage of the signal generator. BThe set voltage value of the signal generator to achieve the target field strength;

[0024] Under the target field strength, the operating data of the car radio when it works alone is compared with the operating data when it works together with other car electronic and electrical devices. Based on the comparison results, the influence of the car electronic and electrical devices on the operation of the car radio antenna is determined, thereby realizing the whole vehicle electromagnetic self-compatibility test of the car radio antenna. The operating data includes sound quality and / or loudness.

[0025] Optionally, before calculating the set voltage value that the signal generator needs to set under the target field strength according to formulas (1), (2), (3) and (4), the method further includes: obtaining the field strength value at the base position of the vehicle radio antenna and the actual output voltage value of the signal generator.

[0026] According to a third aspect of the embodiments of this specification, a vehicle radio antenna self-compatibility testing device is provided, comprising:

[0027] A module is provided for building a vehicle radio antenna self-compatibility test system as described in any of the technical solutions in the first aspect.

[0028] The voltage value determination module is used to calculate the set voltage value that the signal generator needs to be set under the target field strength according to formula (1), formula (2), formula (3) and formula (4), and adjust the output voltage of the signal generator to the set voltage value, wherein the target field strength is the preset test field strength;

[0029]

[0030]

[0031]

[0032]

[0033] Where a is the field strength value at the base of the vehicle radio antenna, b is the target field strength, and U A U is the actual output voltage of the signal generator. B The set voltage value of the signal generator to achieve the target field strength;

[0034] The comparison module is used to compare the operating data of the vehicle radio when it is working alone with the operating data of other vehicle electronic and electrical devices when they are working together under the target field strength, so as to determine the influence of the vehicle electronic and electrical devices on the operation of the vehicle radio antenna based on the comparison results, thereby realizing the whole vehicle electromagnetic self-compatibility test of the vehicle radio antenna, wherein the operating data includes sound quality and / or loudness.

[0035] This specification describes an embodiment that utilizes an audio source, signal generator, and transmitting antenna in conjunction to construct the electromagnetic compatibility environment for the entire vehicle. It enables self-compatibility testing of the vehicle radio antenna without the need for a complex testing system. The test scheme is simple and easy to operate, thus reducing testing costs and shortening the testing cycle. Furthermore, by ensuring that the transmitting antenna and the vehicle radio antenna have the same distributed parameters based on the same reference plane, it avoids introducing irrelevant variables such as antenna distributed capacitance that could interfere with or affect the test, thereby improving test accuracy.

[0036] Furthermore, 1m was chosen as the test distance. Most frequency bands of radio broadcasting are in the far field (the distance d between the two antennas is greater than 1 / 2π of the wavelength λ of the radio broadcasting frequency f, i.e., d>λ / (2πf)). At this distance, the attenuation trends of the electric field and magnetic field in space are the same, and the electromagnetic waves in space are plane waves. This makes the test conducted according to this method more universal. Moreover, as the distance increases, the transmission efficiency of the radio transmitting antenna and the output power of the signal source need to be greatly improved. The test requirements can be met at the 1m position, while reducing the requirements for the transmitting antenna and signal generator, thereby reducing the test cost and improving the test efficiency.

[0037] Furthermore, by calculating the set voltage value required for the signal generator under the target field strength using a preset formula, the target test field strength can be accurately and quickly established without multiple random voltage adjustments, improving the convenience and efficiency of the test and further shortening the test cycle. On the other hand, this test method ensures that the actual field strength in the test reaches the target field strength, making the test field strength controllable. This solves the problem of poor consistency between the actual field strength and the target field strength in existing vehicle electromagnetic self-compatibility tests, reduces the number of invalid tests caused by the actual field strength being lower than the target field strength, and further shortens the test cycle and improves the standardization of electromagnetic self-compatibility testing.

[0038] Compared with the prior art, the inventive points of the embodiments in this specification include at least:

[0039] 1. By cooperating with an audio source, a signal generator, and a transmitting antenna, the electromagnetic compatibility environment can be simulated. The scheme is simple, easy to operate, and low in cost. At the same time, the transmitting antenna and the vehicle radio antenna have the same distributed parameters based on the same reference plane, avoiding the interference and influence of irrelevant variables such as the distributed capacitance of the antenna on the test, thereby improving the accuracy of the test. This is one of the inventive points of this embodiment of the invention.

[0040] 2. Setting the transmitting antenna at a distance of 1 meter from the vehicle's onboard radio antenna satisfies the testing requirements while reducing the demands on the transmitting antenna and signal generator, thus lowering testing costs. It also helps ensure that the electric and magnetic fields in space exhibit the same attenuation trend, and since electromagnetic waves in space are plane waves, the field strength at each point on the wavefront is more likely to be equal, avoiding interference and influence from different field strength distributions. Therefore, the test is more universal and has higher accuracy. Simultaneously, avoiding the increased hardware requirements of the equipment with increasing distance, and further reducing testing costs, is one of the inventive points of this embodiment.

[0041] 3. The method of calculating the set voltage value required for the signal generator under the target field strength is simple and easy to operate. It can accurately and quickly build the target test field strength without the need for multiple random voltage adjustments, which is efficient and fast. At the same time, it can also ensure that the actual field strength in the test reaches the target field strength, realize the controllability of the test field strength, and reduce and avoid invalid tests caused by the actual field strength being lower than the target field strength. This is one of the inventive points of this invention. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the composition of a vehicle radio antenna self-compatibility test system according to an embodiment of the present invention;

[0044] Figure 2a This is a schematic diagram showing the installation of the transmitting antenna when the vehicle radio antenna is a pole antenna.

[0045] Figure 2b This is a schematic diagram showing the installation of the transmitting antenna when the car radio antenna is a shark fin antenna;

[0046] Figure 2c This is a schematic diagram showing the installation of the transmitting antenna when the car radio antenna is used as a window antenna.

[0047] Figure 3This is a flowchart of a vehicle radio antenna self-compatibility test method according to an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the composition of a vehicle radio antenna self-compatibility testing device according to an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram illustrating the working principle of a vehicle radio antenna self-compatibility testing system according to another embodiment of the present invention. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this specification are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0052] This specification discloses a vehicle radio antenna self-compatibility testing system, method, and apparatus. These are described in detail below.

[0053] Figure 1 This is a schematic diagram of the composition of a vehicle radio antenna self-compatibility testing system according to an embodiment of the present invention; as shown below. Figure 1 As shown, the test system includes: an audio source, a signal generator, and a transmitting antenna;

[0054] The audio source is connected to the signal generator, the signal generator is connected to the transmitting antenna, the transmitting antenna is set at a preset distance from the vehicle radio antenna of the vehicle under test, and the transmitting antenna and the vehicle radio antenna have the same distribution parameters based on the same reference plane, and the distance between any part of the transmitting antenna and the vehicle radio antenna is not less than the preset distance;

[0055] The audio source is used to generate a modulation signal;

[0056] The signal generator is used to take the modulated signal as input and output a radio signal at the target frequency;

[0057] The radio signal at the target frequency is transmitted outward through the transmitting antenna and received by the vehicle radio antenna. It is then demodulated by the vehicle radio of the vehicle under test and played back. Based on the playback, the electromagnetic self-compatibility test of the vehicle radio antenna is performed.

[0058] In one embodiment, the transmitting antenna is a broadcast radio transmitting antenna for transmitting radio waves. Vehicle radio antennas generally include pole antennas, shark fin antennas, and window antennas. When setting up the system, for different types of antennas, the distributed parameters of the two antennas based on the same reference plane are required to be the same. For example, the reference plane can be the ground, and the vehicle under test is parked on the ground, so that the distributed parameters of the two antennas relative to the ground are the same. This avoids introducing irrelevant variables such as the distributed capacitance of the antennas to interfere with and affect the test, thereby improving the accuracy and effectiveness of the test. This is one of the inventive points of this invention.

[0059] In one embodiment, the preset distance is 1m. On one hand, this distance aligns with international standards for electromagnetic compatibility testing of vehicle components, allowing for data more similar to that obtained during component testing. On the other hand, as the distance increases, the transmission efficiency of the transmitting antenna and the output power of the signal source need to be significantly improved. Choosing 1m as the test distance satisfies testing requirements while reducing hardware requirements for the transmitting antenna and signal source, thereby reducing testing costs and improving testing efficiency. Furthermore, at a 1m position, the distance d between the two antennas is greater than 1 / 2π of the wavelength λ of the radio broadcast frequency f, i.e., d > λ / (2πf), where π is the symbol for pi. Since most radio broadcast frequencies are far-field frequencies, the attenuation trends of the electric and magnetic fields in space are the same. The electromagnetic waves in space are plane waves, making it easier for the field strength at each point on the wavefront to be equal, avoiding interference and influence from uneven field strength distribution on the test, and reducing the introduction of irrelevant variables that interfere with the test. Therefore, this makes the test more universal and has higher accuracy, which is one of the inventive points of this invention.

[0060] In one embodiment, the audio source, signal generator, and transmitting antenna are combined to construct the electromagnetic compatibility environment of the entire vehicle. Self-compatibility testing of the vehicle radio antenna can be achieved without deploying a complex testing system. The testing scheme is simple and easy to operate, thus reducing testing costs and shortening the testing cycle, which is one of the inventive points of this invention.

[0061] Specifically, when setting up the test system, the antenna with the circuit board mounted in the base should be configured as follows:

[0062] Figure 2a This is a schematic diagram showing the installation of the transmitting antenna when the car radio antenna is a pole antenna, as shown below. Figure 2aAs shown, for a pole antenna, the transmitting antenna and the pole antenna are parallel in space, their bases are horizontal and at the same height, and the distance between any part of the two antennas is not less than 1m.

[0063] Figure 2b This is a schematic diagram showing the installation of the transmitting antenna when the car radio antenna is a shark fin antenna, as shown below. Figure 2b As shown, for a shark fin antenna, the base of the transmitting antenna and the shark fin antenna should be horizontal and at the same height, and the distance between any part of the two antennas should not be less than 1m.

[0064] Figure 2c This is a schematic diagram showing the installation of the transmitting antenna when the car radio antenna is used as a window antenna. Figure 2c As shown, for window antennas, the bases of the transmitting antenna and the window antenna should be horizontal and at the same height, and the distance between any part of the two antennas should not be less than 1 meter. When testing antennas for different vehicles, the above installation rules can be used as a reference for equipment placement and setup. This achieves replicability of operation, reduces the professional requirements, and makes the operation simple and easy to implement.

[0065] In one embodiment, the audio source is an audio playback device with an AUX interface. Audio playback devices with AUX interfaces can more effectively shield against external electromagnetic interference, reducing the introduction of irrelevant variables in interference testing and helping to improve the accuracy of the test.

[0066] In one embodiment, the audio source inputs the modulation signal to the signal generator via a BNC coaxial cable. The audio source, used for playing audio, and its input to the signal generator via a BNC coaxial cable provides better resistance to external interference and avoids poor test results due to audio information being affected by variables unrelated to the test.

[0067] In one embodiment, the signal generator is capable of external modulation and has an output frequency range of 0.53–108 MHz. The signal source is configured for external modulation, the modulation signal is configured as an externally input audio source, and the output frequency is configured as the target frequency to be tested. The requirement is that the radio waves within the target frequency are generated by the signal source and modulated by the external audio source, and that the radio waves at the target frequency can effectively transmit the information input from the external audio source.

[0068] In addition, in order not to affect the interoperability of various radio frequencies, in one embodiment, the maximum frequency deviation of the signal generator does not exceed 500kHz and the output impedance is 50Ω.

[0069] In one implementation, the target field strength is a typical value of the field strength of a radio broadcast in the near field. To simulate the electromagnetic environment faced by a vehicle in actual use and improve the effectiveness of the test, the target field strength can be a typical value of the radio broadcast in the near field, such as 39.81 uV / m, 398.11 uV / m, and 1258.93 uV / m, respectively.

[0070] Figure 3 A flowchart of a vehicle radio antenna self-compatibility test method according to another embodiment of this specification is shown in Figure 2. The test method includes:

[0071] S310, Build a vehicle radio antenna self-compatibility test system as described in any of the above embodiments;

[0072] S320, calculate the set voltage value that the signal generator needs to set under the target field strength according to formula (1), formula (2), formula (3) and formula (4), and adjust the output voltage of the signal generator to the set voltage value, wherein the target field strength is the preset test field strength;

[0073]

[0074]

[0075]

[0076]

[0077] Where a is the field strength value at the base of the vehicle radio antenna, b is the target field strength, and U A U is the actual output voltage of the signal generator. B The set voltage value of the signal generator to achieve the target field strength;

[0078] S330, under the target field strength, the operating data of the car radio when it works alone is compared with the operating data when it works together with other car electronic and electrical devices, so as to determine the influence of the car electronic and electrical devices on the operation of the car radio antenna based on the comparison results, thereby realizing the whole vehicle electromagnetic self-compatibility test of the car radio antenna, wherein the operating data includes sound quality and / or loudness.

[0079] After setting up the test system described in any of the above embodiments according to the steps introduced above, the transmitting antenna transmits radio waves, which are captured and received by the car radio antenna. After demodulation by the car radio, the waves are played into the car through the car speaker / audio system. According to step S320, the output voltage of the signal generator is readjusted and set to achieve the preset target field strength. Specifically, a handheld spectrum analyzer or receiver is used to record the field strength at the location of the car radio antenna base, and the output voltage in the current signal source setting parameters is obtained. By calculating using the formula, the actual set voltage value of the signal source required for the expected typical field strength can be obtained.

[0080] After resetting the output voltage of the signal generator to achieve the preset target field strength, turn off all electronic and electrical equipment in the vehicle except for the radio, close all doors and windows, adjust the radio volume, and record the operating data when the car radio is working alone. Then, test the operating data when the car radio is working with any other vehicle electronic and electrical equipment, compare the operating data under the two conditions, and perform a vehicle-wide electromagnetic self-compatibility test on the car radio antenna based on the comparison results. The vehicle electronic and electrical equipment includes, but is not limited to, the heater motor, ignition switch, and windshield wipers.

[0081] The target voltage value that the signal generator needs to set under the target field strength is calculated by formula. The target test field strength can be accurately and quickly built without multiple random voltage adjustments, which is efficient and fast. At the same time, it can also ensure that the actual field strength in the test reaches the target field strength, realize the controllability of the test field strength, and reduce and avoid invalid tests caused by the actual field strength being lower than the target field strength. This is one of the inventive points of this invention.

[0082] In one embodiment, before calculating the set voltage value that the signal generator needs to set under the target field strength according to formulas (1), (2), (3) and (4), the method further includes: obtaining the field strength value at the base position of the vehicle radio antenna and the actual output voltage value of the signal generator.

[0083] Adapted to the above method embodiments, Figure 4 A schematic diagram of the composition of a vehicle radio antenna self-compatibility test apparatus according to another embodiment of this specification is shown. Figure 4 As shown, the self-compatibility testing device 400 includes:

[0084] Module 410 is used to build a vehicle radio antenna self-compatibility test system as described in any of the technical solutions in the first aspect;

[0085] The voltage value determination module 420 is used to calculate the set voltage value that the signal generator needs to be set under the target field strength according to formula (1), formula (2), formula (3) and formula (4), and adjust the output voltage of the signal generator to the set voltage value, wherein the target field strength is a preset test field strength;

[0086]

[0087]

[0088]

[0089]

[0090] Where a is the field strength value at the base of the vehicle radio antenna, b is the target field strength, and U A U is the actual output voltage of the signal generator. B The set voltage value of the signal generator to achieve the target field strength;

[0091] The comparison module 430 is used to compare the operating data of the vehicle radio when it is working alone with the operating data of other vehicle electronic and electrical devices when they are working together under the target field strength, so as to determine the influence of the vehicle electronic and electrical devices on the operation of the vehicle radio antenna based on the comparison results, thereby realizing the whole vehicle electromagnetic self-compatibility test of the vehicle radio antenna, wherein the operating data includes sound quality and / or loudness.

[0092] The working principle of the testing system of this invention will be explained in detail below, taking a heater motor as an example. Figure 5 The working principle diagram of the test system is shown, such as... Figure 5 As shown, the workflow of this testing system includes the following steps:

[0093] Step 1: Place the radio transmitting antenna 1 meter away from the car radio antenna. Specifically, for a pole antenna, the radio transmitting antenna and the pole antenna must be parallel in space, with their bases at the same horizontal level, and the distance between any part of the two antennas must not be less than 1 meter; for a shark fin antenna, the radio transmitting antenna and the shark fin antenna base must be at the same horizontal level, and the distance between any part of the two antennas must not be less than 1 meter; for a car window antenna, the radio transmitting antenna and the car window antenna base must be at the same horizontal level, and the distance between any part of the two antennas must not be less than 1 meter.

[0094] Step 2: The audio source loops the audio and inputs it into the signal source via a BNC coaxial cable;

[0095] Step 3: Set the signal source to external modulation, set the modulation signal to the external audio source, and set the output frequency to the target frequency to be tested. The radio waves within the target frequency must be generated by the signal source and modulated by the external audio source. The radio waves at the target frequency must be able to effectively transmit the information input by the external audio source. In addition, to avoid affecting the mutual operation of each radio frequency, the maximum frequency deviation should not exceed 500kHz. Set the output impedance to 50Ω. Adjust the output voltage of the signal source according to Step 4.

[0096] Step 4: Using a handheld spectrum analyzer or receiver, record the field strength at the location of the car radio antenna base and obtain the initial output frequency set by the current signal source. Calculate the output voltage of the signal source when the field strength reaches 39.81uV / m, 398.11uV / m, and 1258.93uV / m according to formulas (1), (2), (3), and (4). Based on the calculated voltage value, reset the parameters of the signal source and set the output voltage parameter of the signal source to the calculated voltage value to achieve the target field strength (i.e., 39.81uV / m, 398.11uV / m, and 1258.93uV / m).

[0097] Step 5: Turn off all electronic and electrical equipment in the vehicle except for the radio, close all doors and windows, adjust the radio volume, and, based on the passenger compartment layout in the overall vehicle structure design, measure the sound quality at the geometric center of the vehicle and ensure it is clear and does not exceed 45 decibels (a relatively comfortable loudness that is acceptable to humans). Keep the car radio volume unchanged to obtain the original working data of the car radio working alone.

[0098] Step 6: According to the pre-defined test cases, conduct tests under different operating conditions and record the operating data of the in-car radio, such as the sound quality and loudness. For the test of the in-car heater motor, with the vehicle in the ON position, increase the heater motor speed by one level every 30 seconds, and record the radio sound quality and loudness at different heater motor speeds. Sound quality can be judged by the human ear. With good sound quality, the in-car radio reception should be clear and identical to the sound from an external audio source. With good sound quality, the in-car radio reception should be clear and the content should be continuously distinguishable. With average sound quality, the in-car radio reception should be continuously distinguishable. With poor sound quality, the in-car radio reception should not be continuously distinguishable. With very poor sound quality, the in-car radio reception should not be continuously distinguishable and the noise level should be higher than that of an external audio source.

[0099] Step 7: Based on the information obtained in Step 6, determine the impact of the operation of the vehicle's electronic and electrical equipment on the operation of the vehicle radio antenna under different working conditions, and realize the self-compatibility test of the electromagnetic environment of the whole vehicle system for the vehicle radio antenna. Specifically, based on the radio's operating data recorded in Step 6, compare it with the original operating data of the radio recorded in Step 5, and analyze and determine whether there are phenomena such as noise or irregular noise under different speeds of the heater motor.

[0100] The working principle of this testing system is as follows:

[0101] After all the parameters of the signal source are set, the external audio source is input as a modulation signal into the signal generator. The signal generator transmits the modulated signal into the surrounding space through the radio transmission antenna. The car radio antenna captures the radio signal of the target frequency in the space.

[0102] In the actual testing system, the tested objects are the car radio, car horn / speaker, and radio antenna. The independent variable is the rotational speed of the heater motor at different speeds, and the dependent variable is the radio sound quality, loudness, and other data recorded inside the car. After completing the test system setup according to steps 1 to 6 described above, the radio transmitting antenna transmits radio waves into space, which are captured and received by the car receiving antenna. After demodulation by the car radio, the waves are played into the car through the car horn / speaker. At this time, the heater motor speed is adjusted to increase by one speed at intervals, and the radio data is recorded. By comparing the original radio data recorded in step 5, it is analyzed and determined whether there are any noises or irregular noises at different heater motor speeds.

[0103] Actual testing involves numerous and complex operating conditions. Below are a few simple test conditions, but actual testing is not limited to those described below:

[0104] 1. With the ignition switch ON, the engine does not start, and the driver's side window is in the process of rising;

[0105] 2. With the ignition switch ON, the engine does not start, and the passenger-side window is in the process of rising;

[0106] 3. With the ignition switch ON, the engine starts, and the heater motor is at its highest setting.

[0107] 4. With the ignition switch ON, the engine starts, and the sunroof is in the process of opening;

[0108] 5. Ignition switch ON, engine starts, windshield wipers on high speed;

[0109] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0110] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle radio antenna self-compatibility testing system, characterized in that, include: Audio source, signal generator, and transmitting antenna; The audio source is connected to the signal generator, the signal generator is connected to the transmitting antenna, the transmitting antenna is set at a preset distance from the vehicle radio antenna of the vehicle under test, and the transmitting antenna and the vehicle radio antenna have the same distribution parameters based on the same reference plane, and the distance between any part of the transmitting antenna and the vehicle radio antenna is not less than the preset distance; wherein, the preset distance is 1m; The audio source is used to generate a modulation signal; wherein the audio source is an audio playback device with an AUX interface, and the audio source inputs the modulation signal into the signal generator via a BNC coaxial cable; The signal generator is used to take the modulated signal as input and output a radio signal at the target frequency; wherein, the signal generator is capable of external modulation and has an output frequency range of 0.53~108MHz, the maximum frequency deviation of the signal generator does not exceed 500kHz, and the output impedance is 50Ω. The radio signal at the target frequency is transmitted outward through the transmitting antenna and received by the vehicle radio antenna. It is then demodulated by the vehicle radio of the vehicle under test and played back. Based on the playback, the electromagnetic self-compatibility test of the vehicle radio antenna is performed. Under the target field strength, the operating data of the car radio when it works alone is compared with the operating data when it works together with other car electronic and electrical devices. Based on the comparison results, the influence of the car electronic and electrical devices on the operation of the car radio antenna is determined, thereby realizing the whole vehicle electromagnetic self-compatibility test of the car radio antenna. The operating data includes sound quality and / or loudness.

2. The vehicle radio antenna self-compatibility testing system according to claim 1, characterized in that, The target field strength is the typical value of the field strength of radio broadcasting in the near field.

3. A method for testing the self-compatibility of a vehicle radio antenna, characterized in that, include: Establish a vehicle radio antenna self-compatibility test system as described in any one of claims 1 to 2; The set voltage value that the signal generator needs to be set under the target field strength is calculated according to formula (1), formula (2), formula (3) and formula (4), and the output voltage of the signal generator is adjusted to the set voltage value, wherein the target field strength is the preset test field strength; (1) (2) (3) (4) Where a is the field strength value at the base of the vehicle radio antenna, b is the target field strength, and U A U is the actual output voltage of the signal generator. B The set voltage value of the signal generator to achieve the target field strength; Under the target field strength, the operating data of the car radio when it works alone is compared with the operating data when it works together with other car electronic and electrical devices. Based on the comparison results, the influence of the car electronic and electrical devices on the operation of the car radio antenna is determined, thereby realizing the whole vehicle electromagnetic self-compatibility test of the car radio antenna. The operating data includes sound quality and / or loudness.

4. The self-compatibility test method for vehicle radio antennas according to claim 3, characterized in that, Before calculating the set voltage value that the signal generator needs to set under the target field strength according to formulas (1), (2), (3) and (4), the method further includes: obtaining the field strength value at the base position of the vehicle radio antenna and the actual output voltage value of the signal generator.

5. A self-compatibility testing device for a vehicle radio antenna, characterized in that, include: A module is provided for building a vehicle radio antenna self-compatibility test system as described in any one of claims 1 to 2; The voltage value determination module is used to calculate the set voltage value that the signal generator needs to be set under the target field strength according to formula (1), formula (2), formula (3) and formula (4), and adjust the output voltage of the signal generator to the set voltage value, wherein the target field strength is the preset test field strength; (1) (2) (3) (4) Where a is the field strength value at the base of the vehicle radio antenna, b is the target field strength, and U A U is the actual output voltage of the signal generator. B The set voltage value of the signal generator to achieve the target field strength; The comparison module is used to compare the operating data of the vehicle radio when it is working alone with the operating data of other vehicle electronic and electrical devices when they are working together under the target field strength, so as to determine the influence of the vehicle electronic and electrical devices on the operation of the vehicle radio antenna based on the comparison results, thereby realizing the whole vehicle electromagnetic self-compatibility test of the vehicle radio antenna, wherein the operating data includes sound quality and / or loudness.

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