CN114019275B - Software-driven electromagnetic environment closed-loop generation system and method - Google Patents
Software-driven electromagnetic environment closed-loop generation system and method Download PDFInfo
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- CN114019275B CN114019275B CN202111259435.4A CN202111259435A CN114019275B CN 114019275 B CN114019275 B CN 114019275B CN 202111259435 A CN202111259435 A CN 202111259435A CN 114019275 B CN114019275 B CN 114019275B
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Abstract
The invention discloses a software-driven electromagnetic environment closed-loop generation system and a software-driven electromagnetic environment closed-loop generation method. According to the method, an electromagnetic environment monitoring unit is added in a traditional electromagnetic environment generation system in a networking mode to improve the unidirectional characteristic of an electromagnetic environment physical generation unit, monitoring data of the electromagnetic environment monitoring unit are fed back to control software in real time, and the specified generation of electromagnetic environment intensity is realized by using a closed-loop control method. The invention can be applied to electromagnetic environment generation, calibration and the like in the field of equipment electromagnetic environment effect test or complex electromagnetic environment adaptability assessment, and reduces the processes of cable loss calibration, emission channel check, emission antenna fine alignment and the like of a transmitting end in the traditional electromagnetic environment generation, thereby greatly simplifying the calibration process and increasing the test efficiency.
Description
Technical Field
The invention relates to the field of electromagnetic environment effect tests, in particular to a software-driven electromagnetic environment closed-loop generation system and method.
Background
Electronic devices typically exhibit interference, performance degradation, damage, etc. in complex electromagnetic environments. In order to research, analyze and evaluate the electromagnetic environment effect and the adaptability under the complex electromagnetic environment, grasping the affected degree of various technical indexes of the electronic equipment and physically simulating the electromagnetic environment approaching to the reality is an effective means. The electromagnetic environment of the electronic equipment is complex and changeable under the real environment condition, and the electronic equipment has the characteristics of numerous radiation sources, wide frequency band coverage, complex signal patterns and the like. The current common electromagnetic environment physical generation system generally utilizes a multichannel technology to realize the coverage of an electromagnetic environment broadband, but the problems of uneven frequency domain in environment construction and the like caused by different antenna gains, different line losses, different spatial attenuations and the like of a construction system exist on the broadband coverage, special electromagnetic environment calibration is needed, the current calibration is mainly realized by a mode of adding interpolation to a plurality of selected intensities, and the problems of slow calibration process, limited precision, time-consuming subsequent data processing and the like exist. Therefore, a new electromagnetic environment generating method is needed to realize the rapid and accurate generation of the electromagnetic environment with the specified intensity at the tested electronic equipment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a software-driven electromagnetic environment closed-loop generation system and a software-driven electromagnetic environment closed-loop generation method, solves the problems of quick calibration and accurate generation in electromagnetic environment generation, and can be applied to complex electromagnetic environment physical simulation.
The technical scheme adopted for solving the technical problems is as follows:
The invention provides a software-driven electromagnetic environment closed-loop generation system, which comprises an electromagnetic environment physical simulation unit, an electromagnetic environment monitoring unit and closed-loop control software; wherein:
The electromagnetic environment physical simulation unit is used for simulating and transmitting signals in a wide frequency range, and the coverage of the wide frequency range is formed by combining transmitting channels in different frequency ranges;
the electromagnetic environment monitoring unit is used for monitoring the signal transmitted by the electromagnetic environment physical simulation unit;
the closed-loop control software is used for networking and controlling the electromagnetic environment physical simulation unit and the electromagnetic environment monitoring unit in a wired or wireless mode, so that unified control over the electromagnetic environment physical generation unit and the electromagnetic environment monitoring unit is realized; the monitoring data of the electromagnetic environment monitoring unit is fed back to the control software in real time, and the electromagnetic environment intensity of the designated position is rapidly generated by using a closed-loop control method.
Further, the electromagnetic environment physical simulation unit of the present invention includes: vector signal source, power amplifier, transmitting antenna and accessories; or with a purpose-built, integrated electronic component.
Further, the electromagnetic environment monitoring unit of the present invention includes: a receiving antenna, spectrometer or receiver, and are physically connected to each other by a radio frequency cable.
Further, in the closed-loop control software of the present invention, the frequency is used to avoid the frequency range of the electromagnetic environment generated during the wireless connection, or a wireless connection mode of non-radio frequency signals is adopted, and the wireless connection mode of non-radio frequency signals includes ultrasonic waves.
Further, the receiving antenna of the electromagnetic environment monitoring unit is arranged in the middle of the tested area and flexibly adjusted according to the arrangement position or the environment of the tested equipment EUT; under the complex external field condition, the antenna is arranged at the side of the EUT, the main body part of the EUT is not shielded by the receiving antenna, the receiving antenna and the EUT are both positioned in the 3dB wave beam width of the transmitting antenna of the electromagnetic environment physical simulation generating unit, and meanwhile, the receiving antenna and the transmitting antenna of the electromagnetic environment physical simulation generating system are basically aligned, so that the receiving antenna and the transmitting antenna are ensured to be both in the 3dB wave beam width of the other side; under the local internal field condition, the EUT is moved out of the tested area under the special condition, and after the electromagnetic environment calibration is completed by utilizing the electromagnetic environment closed-loop generation system, the EUT is put into the tested area for subsequent tests.
The invention provides a software-driven electromagnetic environment closed-loop generation method, which comprises the following steps:
setting a carrier signal without modulation in the electromagnetic environment generation process;
setting the resolution bandwidth of a spectrometer of the electromagnetic environment monitoring unit through electromagnetic environment closed-loop control software;
Setting a target value and an actual value according to the electric field intensity at the tested position; combining the receiving antenna coefficient, the cable loss of the electromagnetic environment monitoring unit, the receiving amplitude of the spectrometer and the level setting value of the electromagnetic environment physical generating unit to obtain the relation between the field intensity at the target and the receiving amplitude of the spectrometer measured by the electromagnetic environment monitoring unit;
The method comprises the steps that the output amplitude of a signal source in an electromagnetic environment physical simulation unit is set at will, the reading of a spectrometer in an electromagnetic environment monitoring unit is monitored for a certain time, a closed loop control software compares a monitored value with a set value, and when the set precision is not met, the output of the electromagnetic environment physical simulation unit is continuously corrected by using an iterative formula;
and comparing the monitoring value with a set value after correcting the output amplitude of the signal source in the electromagnetic environment physical simulation unit every time, and indicating that the designated field intensity of the tested area is reached when the difference between the monitoring value and the set value is smaller than the set precision.
Further, in the method of the present invention:
The electric field intensity at the tested position is set to be a target value E 0 in dB mu V/m, the actual value E 1 in dB mu V/m; the antenna coefficient of the receiving antenna of the electromagnetic environment monitoring unit is AF 1, the unit is dB/m, the cable loss is L 1, the receiving amplitude of the spectrometer is P r, the unit is dBm, the level setting value of the electromagnetic environment physical generating unit is P t, the unit is dBm, and the relation between the field intensity E 1 at the target and the P r measured by the electromagnetic environment monitoring unit can be obtained by the following formula.
Further, in the method of the present invention:
The signal source output amplitude P t in the electromagnetic environment physical simulation unit is set at will, the reading P r of the spectrometer in the electromagnetic environment monitoring unit is monitored for a certain time, the closed loop control software compares the monitored value with a set value, when the set precision is not satisfied, i.e. the absolute value E 1-E0 is smaller than a set value, the output P t of the electromagnetic environment physical simulation unit is continuously corrected by using the following iterative formula, and the calibration or generation process of the third time is shown in brackets:
Pt(k)＝Pt(k-1)+K1*(e(k-1)-e(k-2))+K2*e(k-1)
In the above formula, k=2, … n and P t (1) are initial values of the signal source amplitude, and are set arbitrarily; e represents the difference between the target field strength value E 0 and the actual field strength value E 1, i.e., e=e 0-Pr-107-AF1-L1, E (k) represents the difference between the kth time target field strength value E 0 and the actual field strength value E 1, E (0) =0; p t (K) represents the amplitude value set by the kth signal source, and K 1 and K 2 represent feedback coefficients respectively, which are not more than 1.
The invention has the beneficial effects that: according to the software-driven electromagnetic environment closed-loop generation system and method, the electromagnetic environment monitoring unit is added in the traditional electromagnetic environment generation system in a networking mode to improve the unidirectional characteristic of the electromagnetic environment physical generation unit, the monitoring data of the electromagnetic environment monitoring unit are fed back to the control software in real time, the specified generation of the electromagnetic environment intensity is realized by using a closed-loop control method, and the processes of cable loss calibration, transmitting channel check, transmitting antenna precise alignment and the like of a transmitting end in the traditional electromagnetic environment generation are reduced, so that the calibration process is greatly simplified, and the test efficiency is increased.
The software-driven electromagnetic environment closed-loop generation method provided by the invention is simple, simple and efficient in principle, does not need transmitting channel information of an electromagnetic environment physical generation end and does not need precise alignment between transmitting and receiving antennas, so that the calibration process is greatly simplified, the test efficiency is increased, and the method has strong engineering practicability.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the composition of an electromagnetic environment closed loop generation system according to an embodiment of the present invention;
Fig. 2 is an example of a closed loop control process of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in FIG. 1, the software-driven electromagnetic environment closed-loop generation system in the embodiment of the invention relates to an electromagnetic environment signal generation method under a single or multiple radiation source scene, which can be applied to electromagnetic environment generation, calibration and the like in the field of equipment electromagnetic environment effect test or complex electromagnetic environment adaptability assessment. The electromagnetic environment physical generation unit and the electromagnetic environment monitoring unit are controlled in a unified mode by utilizing a wireless networking mode, the electromagnetic environment intensity generation of a designated position is rapidly and accurately realized by utilizing a closed-loop control algorithm, and the problems of slow calibration and large error in the electromagnetic environment physical generation are solved.
The system consists of an electromagnetic environment physical simulation unit, an electromagnetic environment monitoring unit and closed-loop control software. The electromagnetic environment physical simulation unit consists of vector signal sources, a power amplifier, a transmitting antenna and other instrument equipment and accessories, and the coverage of the wide frequency range of the electromagnetic environment physical simulation unit can be formed by combining transmitting channels of different frequency ranges; or may be comprised of custom made, integrated electronic components. The electromagnetic environment monitoring unit is composed of a receiving antenna, a frequency spectrograph or a receiver, and is physically connected with each other through a radio frequency cable. The closed-loop control software is used for networking control of the electromagnetic environment physical simulation unit and the electromagnetic environment monitoring unit in a wired or wireless mode, and when the wireless mode is connected, the wireless connection needs to pay attention to the fact that the use frequency of the wireless connection should avoid the frequency range of the electromagnetic environment, or a wireless connection mode (such as ultrasonic wave) of non-radio frequency signals is adopted.
The receiving antenna of the electromagnetic environment monitoring unit is generally arranged in the middle of the tested area, and is flexibly adjusted according to the arrangement position or the environment of the tested equipment (EUT, equipment under test), for example, under the complex external field condition, the receiving antenna can be arranged at the side of the EUT, but the receiving antenna is required to be ensured not to shield the main body part of the EUT, and the receiving antenna and the EUT are both positioned within the 3dB wave beam width of the transmitting antenna of the electromagnetic environment physical simulation generating unit, and meanwhile, the receiving antenna and the transmitting antenna of the electromagnetic environment physical simulation generating system are required to be basically aligned, so that the receiving antenna and the transmitting antenna are both ensured to be within the 3dB wave beam width of each other. Under the local internal field condition, the EUT is required to be moved out of the tested area under the special condition, and after the electromagnetic environment calibration is completed by utilizing the electromagnetic environment closed-loop generation system, the EUT is placed into the tested area for subsequent tests.
The embodiment of the invention discloses a software-driven electromagnetic environment closed-loop generation method, which specifically comprises the following steps:
The carrier signal without modulation is arranged in the electromagnetic environment generation process, so that the quick response of the electromagnetic environment monitoring unit is facilitated. The resolution bandwidth of the spectrometer of the electromagnetic environment monitoring unit is reasonably set by electromagnetic environment closed-loop control software, and is generally set to be 1MHz.
Here, the electric field strength at the test position is set to be a target value E 0 (in dB μV/m) and an actual value E 1 (in dB μV/m); the antenna coefficient of the receiving antenna of the electromagnetic environment monitoring unit is AF 1 (dB/m), the cable loss is L 1, the receiving amplitude of the spectrometer is P r (dBm), the level setting value of the electromagnetic environment physical generating unit is P t (dBm), and the relation between the field intensity E 1 at the target and the P r measured by the electromagnetic environment monitoring unit can be obtained by the following formula E 1＝Pr+107+AF1+L1.
The signal source output amplitude P t in the electromagnetic environment physical simulation unit is set at will, the reading P r of the spectrometer in the electromagnetic environment monitoring unit is monitored for a certain time, the closed loop control software continuously corrects the output P t of the electromagnetic environment physical simulation unit by using the following iterative formula when the monitoring value is compared with the set value and the set precision is not met (i.e., |E 1-E0 | is smaller than a set value), and the calibration or generation process is shown in brackets for the third time.
Pt(k)＝Pt(k-1)+K1*(e(k-1)-e(k-2))+K2*e(k-1)
In the above formula, k=2, … n and P t (1) are initial values of the signal source amplitude, and are set arbitrarily; e represents the difference between the target field strength value E 0 and the actual field strength value E 1, i.e., e=e 0-Pr-107-AF1-L1, E (k) represents the difference between the kth time target field strength value E 0 and the actual field strength value E 1, E (0) =0; p t (K) represents the amplitude value set by the kth signal source, and K 1 and K 2 represent feedback coefficients, respectively, which are generally not greater than 1.
After each correction P t, the monitoring value E 1 is compared with the set value E 0, and when the difference between the two is smaller than the set precision, the designated field intensity of the tested area is reached. K 1 and K 2 are generally reasonably set, and the time to reach the specified field strength is generally not more than 2s.
In another embodiment of the invention:
FIG. 1 is a schematic diagram showing the components of an electromagnetic environment closed loop generation system, wherein a signal source, a power amplifier and a transmitting antenna together form an electromagnetic environment physical generation unit; the receiving antenna and the spectrometer form an electromagnetic environment monitoring unit. The two units are uniformly controlled by closed-loop control software in a wired or wireless mode (selected according to the actual test distance). The receiving antenna and the tested device are positioned within the 3dB wave beam width of the transmitting antenna, and the receiving antenna and the transmitting antenna are roughly aligned.
A scene is selected, an electromagnetic environment with 70dB mu V/m electric field intensity covered by a 3 GHz-4 GHz frequency band is required to be realized in a tested area, and a frequency interval of 0.1GHz is selected for field intensity calibration. The antenna coefficient AF 1 of the receiving antenna and the cable loss L 1 between the receiving antenna and the spectrometer are obtained in advance, then the field intensity of the tested area can be obtained by E 1＝Pr+107+AF1+L1, and Pr is the reading of the spectrometer.
The signal source is set as continuous wave, the frequency is set to 3GHz (the frequency is automatically adjusted according to software later), and the output amplitude Pt is-45 dBm. The closed loop control software sets the output amplitude to be adjusted every 0.1s, according to the adjustment formula mentioned above. The final implementation was adjusted in place at 0.8s (i.e. after 8 adjustments), i.e. the tested area reached 70dB V/m.
And then continuously adjusting the frequency, repeating the above procedures, thereby obtaining a calibration result of the coverage of the frequency band of 3 GHz-4 GHz, wherein the time consumption T=the frequency adjustment time+the frequency number of the whole process is the closed-loop control time, and the total calibration time is not more than 10s for a scene.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (6)
1. The method is characterized by being realized by a software-driven electromagnetic environment closed-loop generation system, wherein the system comprises an electromagnetic environment physical simulation unit, an electromagnetic environment monitoring unit and closed-loop control software; wherein:
The electromagnetic environment physical simulation unit is used for simulating and transmitting signals in a wide frequency range, and the coverage of the wide frequency range is formed by combining transmitting channels in different frequency ranges;
the electromagnetic environment monitoring unit is used for monitoring the signal transmitted by the electromagnetic environment physical simulation unit;
The closed-loop control software is used for networking and controlling the electromagnetic environment physical simulation unit and the electromagnetic environment monitoring unit in a wired or wireless mode, so that unified control over the electromagnetic environment physical generation unit and the electromagnetic environment monitoring unit is realized; the monitoring data of the electromagnetic environment monitoring unit is fed back to the control software in real time, and the electromagnetic environment intensity of the designated position is rapidly generated by using a closed-loop control method;
the method comprises the following steps:
setting a carrier signal without modulation in the electromagnetic environment generation process;
setting the resolution bandwidth of a spectrometer of the electromagnetic environment monitoring unit through electromagnetic environment closed-loop control software;
setting a target value and an actual value according to the electric field intensity at the tested position; combining the antenna coefficient of the receiving antenna, the cable loss and the receiving amplitude of the spectrometer of the electromagnetic environment monitoring unit and the level setting value of the electromagnetic environment physical generating unit to obtain the relation between the field intensity at the target and the receiving amplitude of the spectrometer measured by the electromagnetic environment monitoring unit;
The method comprises the steps that the output amplitude of a signal source in an electromagnetic environment physical simulation unit is set at will, the reading of a spectrometer in an electromagnetic environment monitoring unit is monitored for a certain time, a closed loop control software compares a monitored value with a set value, and when the set precision is not met, the output of the electromagnetic environment physical simulation unit is continuously corrected by using an iterative formula;
after the output amplitude of a signal source in the electromagnetic environment physical simulation unit is corrected each time, comparing a monitoring value with a set value, and when the difference between the monitoring value and the set value is smaller than the set precision, indicating that the designated field intensity of the tested area is reached at the moment;
The method comprises the following steps:
The signal source output amplitude P t in the electromagnetic environment physical simulation unit is set at will, the reading P r of the spectrometer in the electromagnetic environment monitoring unit is monitored for a certain time, the closed loop control software compares the monitored value with a set value, when the set precision is not satisfied, i.e. the absolute value E 1-E0 is smaller than a set value, the output P t of the electromagnetic environment physical simulation unit is continuously corrected by using the following iterative formula, and the calibration or generation process of the third time is shown in brackets:
In the above formula, k=2, … n and P t (1) are initial values of the signal source amplitude, and are set arbitrarily; e represents the difference between the target field strength value E 0 and the actual field strength value E 1, i.e., e=e 0-Pr-107-AF1-L1, E (k) represents the difference between the kth time target field strength value E 0 and the actual field strength value E 1, E (0) =0; p t (K) represents the amplitude value set by the kth signal source, and K 1 and K 2 represent feedback coefficients respectively, which are not more than 1.
2. The software-driven electromagnetic environment closed-loop generation method according to claim 1, wherein the electromagnetic environment physical simulation unit includes: vector signal source, power amplifier, transmitting antenna and accessories; or with a purpose-built, integrated electronic component.
3. The method for generating a closed loop of a software-driven electromagnetic environment according to claim 1, wherein the electromagnetic environment monitoring unit comprises: a receiving antenna, spectrometer or receiver, and are physically connected to each other by a radio frequency cable.
4. The method for generating a closed loop of an electromagnetic environment driven by software according to claim 1, wherein in the closed loop control software, a frequency is used to avoid a frequency range for generating the electromagnetic environment when the closed loop control software is connected in a wireless mode, or a wireless connection mode of non-radio frequency signals is adopted, and the wireless connection mode of the non-radio frequency signals comprises ultrasonic waves.
5. A software-driven electromagnetic environment closed-loop generation method according to claim 3, wherein the receiving antenna of the electromagnetic environment monitoring unit is arranged in the middle of the tested area, and is adjusted according to the arrangement position or the environment of the tested equipment EUT; under the complex external field condition, the antenna is arranged at the side of the EUT, the main body part of the EUT is not shielded by the receiving antenna, the receiving antenna and the EUT are both positioned in the 3dB wave beam width of the transmitting antenna of the electromagnetic environment physical simulation generating unit, and meanwhile, the receiving antenna is aligned with the transmitting antenna of the electromagnetic environment physical simulation generating system, so that the receiving antenna and the transmitting antenna are both ensured to be in the 3dB wave beam width of the other side; and under the local internal field condition, the EUT is moved out of the tested area, and after the electromagnetic environment calibration is completed by utilizing the electromagnetic environment closed-loop generation system, the EUT is put into the tested area for subsequent tests.
6. The software-driven electromagnetic environment closed-loop generation method according to claim 1, wherein:
the electric field intensity at the tested position is set to be a target value E 0 in dB mu V/m, the actual value E 1 in dB mu V/m; the antenna coefficient of the receiving antenna of the electromagnetic environment monitoring unit is AF 1, the unit is dB/m, the cable loss is L 1, the receiving amplitude of the spectrometer is P r, the unit is dBm, the level setting value of the electromagnetic environment physical generating unit is P t, the unit is dBm, and the relation between the field intensity E 1 at the target and the P r measured by the electromagnetic environment monitoring unit can be obtained by the following formula.
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