CN114358046A - Multi-complexity-level complex electromagnetic interference environment simulation generation method and system - Google Patents
Multi-complexity-level complex electromagnetic interference environment simulation generation method and system Download PDFInfo
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Abstract
The invention relates to a multi-complexity-level complex electromagnetic interference environment simulation generation method, which comprises the following steps: obtaining a two-dimensional time-frequency characteristic parameter of fast S transformation of an interfered object signal in a space electromagnetic environment; searching a complexity parameter standard table to obtain the time occupancy rate T corresponding to the complexity gradePFrequency occupancy rate FPAnd energy occupancy EP(ii) a Calculating the duration T of the interference signal under the complexity level2Center frequency F2Power E2The value range of (a); adopting a frequency agile signal generator, and setting interference signal generation parameters of signal frequency, power and duration in the frequency agile signal generator; a complex electromagnetic interference environment is generated corresponding to the level of complexity. The invention also discloses a multi-complexity-level complex electromagnetic interference environment simulation generation system. The invention adopts a rapid S conversion method, and can simultaneously obtain four main characteristic parameters of the interfered signalThe electromagnetic environment with four different complexity levels, such as general complexity, mild complexity, moderate complexity, severe complexity and the like, can be automatically generated.
Description
Technical Field
The invention relates to the technical field of electromagnetic signal processing, in particular to a method and a system for simulating and generating a complex electromagnetic interference environment with multiple complexity levels.
Background
The generation of the complex electromagnetic environment is the premise and the basis for carrying out simulation training in the complex electromagnetic environment, and all countries in the world pay attention to the simulation generation of the complex electromagnetic environment. Electromagnetic environment simulation research in foreign countries is relatively early, and a lot of mature commercial software is available for simulating the electromagnetic environment.
At present, firstly, the cost required for generating a complex electromagnetic environment by using real electronic equipment is high, the simulated electromagnetic environment is closest to the actual electromagnetic environment, but the expensive simulation cost becomes an important obstacle for simulation training. Secondly, the simulator is adopted to simulate the complex electromagnetic environment, which is a simulation generation method of the complex electromagnetic environment with more applications at present. The electronic warfare simulators are of various types and can be divided into a radiation type simulator and an injection type simulator according to different modes of radiating electromagnetic signals; according to different simulation objects, the simulation system can be divided into a radar electronic countermeasure simulator, a communication countermeasure simulator, a photoelectric countermeasure simulator and the like; the electromagnetic environment simulation system is divided into an electromagnetic signal environment simulator, a tactical background combat training simulator, a main combat equipment model matching simulator and the like according to application purposes, and the electromagnetic environment simulated by the simulator has a single function and does not have a multi-complexity electromagnetic environment simulation function. Finally, a computer simulation technology is utilized to simulate a complex electromagnetic environment, a finite difference method is generally adopted, and the method has the main defects of pure software simulation and relatively poor fidelity, the electromagnetic environment frequency band range simulated by pure software is narrow, the simulation space is relatively small, and a large amount of calculation is needed for the electromagnetic environment simulation with a wide frequency band and a large space range.
Disclosure of Invention
The invention mainly aims to provide a multi-complexity-level complex electromagnetic interference environment simulation generation method which is strong in universality, can effectively extract time-frequency characteristic parameters by adopting rapid S conversion, is simple to realize, does not need various parameter measurement devices, can automatically calculate and generate required interference signal parameters, and can automatically execute an electromagnetic interference environment of a required level.
In order to achieve the purpose, the invention adopts the following technical scheme: a multi-complexity-level complex electromagnetic interference environment simulation generation method comprises the following sequential steps:
(1) carrying out rapid S transformation on the space electromagnetic signals acquired by the spectrum analyzer in real time to obtain two-dimensional time-frequency characteristic parameters of the rapid S transformation of the interfered object signals in the space electromagnetic environment: duration T1Center frequency F1Bandwidth B1Power E1；
(2) Searching a complexity parameter standard table according to the complexity grade value of the complex electromagnetic interference environment to be simulated and generated to obtain the time occupancy rate T corresponding to the complexity gradePFrequency occupancy rate FPAnd energy occupancy EP；
(3) Time occupancy T according to the complexity levelPFrequency occupancy rate FPAnd energy occupancy EPUsing the formula | T2T1|/T1＝TP、|F2-F1|/B1＝FP、|E2|/E1＝EPCalculating the duration T of the interference signal at the complexity level2Center frequency F2Power E2The value range of (a);
(4) according to the duration T of the interfering signal2Center frequency F2Power E2The value range of the frequency agile signal generator is adopted, and interference signal generation parameters of signal frequency, power and duration in the frequency agile signal generator are set in a GPIB or LAN program control mode;
(5) and generating a complex electromagnetic interference environment corresponding to the complexity level through an external transmitting antenna and a power amplifier.
In step (1), the fast S-transform is a short-time fourier transform fast algorithm of a signal with a gaussian function as a window function, and its expression is:
in the formula (I), the compound is shown in the specification,
g (f + f') is the Fourier transform of the spatial electromagnetic signal x (t),
w (f', f) is the Fourier transform of a Gaussian window function ψ (t),
t is time, f' is sampling frequency, f is frequency, τ is time shift factor, and i is an imaginary number.
In step (1), the center frequency F1The maximum corresponding frequency point of a two-dimensional time frequency matrix S (t, f) of the signal is obtained; bandwidth B1Is a center frequency F1Subtracting the lower limit frequency from the upper limit frequency when S (t, f) > 0 is nearby; duration T1At the center frequency F of the time-frequency matrix after the rapid S transformation of the interfered object signal1Near amplitude S (t)1t2Time length of F. + -.B) > 0, t1As the end of the signal, t2Is the signal start time; power E1And the amplitude corresponding to the maximum position of the two-dimensional time frequency matrix S (t, f).
In the step (3), | - | denotes an absolute value.
In the step (4), setting the signal frequency in the frequency agile signal generator as the center frequency F2Setting the power in the agile frequency signal generator to power E at any frequency within the range2Setting the duration in the agile frequency signal generator to the duration T2。
Another object of the present invention is to provide a system for simulation generation of a multi-complexity-level complex electromagnetic interference environment, the system comprising:
the receiving antenna adopts an omnidirectional horn antenna with the frequency of 0-40 GHz and is used for receiving electromagnetic signals with the frequency of 0-40 GHz in space;
the frequency spectrum analyzer adopts a real-time analysis instrument with frequency coverage of 0-40 GHz and is used for signal acquisition, time domain analysis and frequency domain analysis;
the upper computer is used for carrying out rapid S transformation on the acquired electromagnetic signals and calculating the duration T1Center frequency F1Bandwidth B1And power E1Controlling the frequency agile signal generator according to the calculation result, and setting interference signal generation parameters of signal frequency, power and duration in the frequency agile signal generator;
the frequency agile signal generator executes signal frequency, power and duration according to a program control instruction sent by the upper computer;
the power amplifier is used for amplifying the power of the output signal of the frequency agile signal generator, and the amplification factor is 0-50 dB;
the transmitting antenna transmits and propagates the electromagnetic signal output by the power amplifier to a free space environment;
the receiving antenna is connected with the spectrum analyzer through a radio frequency line, the spectrum analyzer is connected with the upper computer through a General Purpose Interface Bus (GPIB) or a Local Area Network (LAN), the upper computer is connected with the frequency agile signal generator through the General Purpose Interface Bus (GPIB) or the Local Area Network (LAN), the frequency agile signal generator is connected with the power amplifier through the radio frequency line, and the power amplifier is connected with the transmitting antenna through the radio frequency line.
According to the technical scheme, the beneficial effects of the invention are as follows: firstly, the method is simple to realize, does not need various parameter measuring equipment, adopts a fast S transformation method, overcomes the one-dimensional limitation of Fourier transformation, realizes the extraction of parameters under the condition of single signal acquisition, and can simultaneously and fast extract the duration T1Center frequency F1Bandwidth B1Power E1(ii) a Secondly, the method has strong universality and high automation degree, only needs to appoint the complexity level of the electromagnetic environment to be simulated, and the system automatically generates the interference signal according to the characteristic parameters of the monitoring signalAnd (5) characterizing parameters and automatically executing a simulation generation task.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a block diagram of the system of the present invention;
fig. 3 is a two-dimensional time-frequency diagram of fast S-transform of an interfered object signal according to a first embodiment of the present invention.
Detailed Description
As shown in fig. 1, a method for generating a multi-complexity-level complex electromagnetic interference environment simulation includes the following steps:
(1) carrying out rapid S transformation on the space electromagnetic signals acquired by the spectrum analyzer in real time to obtain two-dimensional time-frequency characteristic parameters of the rapid S transformation of the interfered object signals in the space electromagnetic environment: duration T1Center frequency F1Bandwidth B1Power E1；
(2) Searching a complexity parameter standard table according to the complexity grade value of the complex electromagnetic interference environment to be simulated and generated to obtain the time occupancy rate T corresponding to the complexity gradePFrequency occupancy rate FPAnd energy occupancy EP；
(3) Time occupancy T according to the complexity levelPFrequency occupancy rate FPAnd energy occupancy EPUsing the formula | T2T1|/T1＝TP、|F2-F1|/B1＝FP、|E2|/E1＝EPCalculating the duration T of the interference signal at the complexity level2Center frequency F2Power E2The value range of (a);
(4) according to the duration T of the interfering signal2Center frequency F2Power E2The value range of the frequency agile signal generator is adopted, and interference signal generation parameters of signal frequency, power and duration in the frequency agile signal generator are set in a GPIB or LAN program control mode;
(5) and generating a complex electromagnetic interference environment corresponding to the complexity level through an external transmitting antenna and a power amplifier.
In step (1), the fast S-transform is a short-time fourier transform fast algorithm of a signal with a gaussian function as a window function, and its expression is:
in the formula (I), the compound is shown in the specification,
g (f + f') is the Fourier transform of the spatial electromagnetic signal x (t),
w (f', f) is the Fourier transform of a Gaussian window function ψ (t),
t is time, f' is sampling frequency, f is frequency, τ is time shift factor, and i is an imaginary number.
In step (1), the center frequency F1The maximum corresponding frequency point of a two-dimensional time frequency matrix S (t, f) of the signal is obtained; bandwidth B1Is a center frequency F1Subtracting the lower limit frequency from the upper limit frequency when S (t, f) > 0 is nearby; duration T1At the center frequency F of the time-frequency matrix after the rapid S transformation of the interfered object signal1Near amplitude S (t)1-t2Time length of F. + -.B) > 0, t1As the end of the signal, t2Is the signal start time; power E1And the amplitude corresponding to the maximum position of the two-dimensional time frequency matrix S (t, f).
In the step (3), | - | denotes an absolute value.
In the step (4), setting the signal frequency in the frequency agile signal generator as the center frequency F2Setting the power in the agile frequency signal generator to power E at any frequency within the range2Setting the duration in the agile frequency signal generator to the duration T2。
As shown in fig. 2, the present system includes:
the receiving antenna adopts an omnidirectional horn antenna with the frequency of 0-40 GHz and is used for receiving electromagnetic signals with the frequency of 0-40 GHz in space;
the frequency spectrum analyzer adopts a real-time analysis instrument with frequency coverage of 0-40 GHz and is used for signal acquisition, time domain analysis and frequency domain analysis;
the upper computer is used for carrying out rapid S transformation on the acquired electromagnetic signals and calculating the duration T1Center frequency F1Bandwidth B1And power E1Controlling the frequency agile signal generator according to the calculation result, and setting interference signal generation parameters of signal frequency, power and duration in the frequency agile signal generator;
the frequency agile signal generator executes signal frequency, power and duration according to a program control instruction sent by the upper computer;
the power amplifier is used for amplifying the power of the output signal of the frequency agile signal generator, and the amplification factor is 0-50 dB;
the transmitting antenna transmits and propagates the electromagnetic signal output by the power amplifier to a free space environment;
the receiving antenna is connected with the spectrum analyzer through a radio frequency line, the spectrum analyzer is connected with the upper computer through a General Purpose Interface Bus (GPIB) or a Local Area Network (LAN), the upper computer is connected with the frequency agile signal generator through the General Purpose Interface Bus (GPIB) or the Local Area Network (LAN), the frequency agile signal generator is connected with the power amplifier through the radio frequency line, and the power amplifier is connected with the transmitting antenna through the radio frequency line.
Example one
To better understand how to calculate the duration T of the interference signal in a certain area in the fast S transform domain1Center frequency F1Bandwidth B1Power E1The simulated interfered signal source is a sine wave with a frequency of 13.56MHz, and after the sine wave is subjected to fast S-transform, a corresponding two-dimensional time-frequency diagram is shown in fig. 3. As can be seen from fig. 3, the signal duration is 2ns to 4ns, the center frequency is 13.56MH, the bandwidth is calculated by 3dB cut-off frequency, which is about 0.4MH, and the power is 0.356 mW.
Supposing that the complexity grade value severe complexity of the complex electromagnetic interference environment is generated, searching a complexity parameter standard table to obtain the time occupancy T of the severe complexity gradePFrequency occupancy rate FPAnd energy occupancy EP40-100% of the total weight; the complexity parameter criteria table is table 1:
TABLE 1 standard table of complexity parameters of electromagnetic environment
According to the time occupancy T under the severe complexity levelPFrequency occupancy rate FPAnd energy occupancy EPThe value is 40-100%, and a calculation formula | T is adopted2-T1|/T1＝TP、|F2-F1|/B1＝FP、|E2|/E1＝EPThe duration T of the interference signal at this level of complexity can be calculated2Should have a duration of 0.8ns to 2ns, a center frequency F2Is 13.16MHz to 13.96MHz, power E2The value range of (a) is 0.1424mW to 0.356 mW;
according to the duration T of the interfering signal2Center frequency F2Power E2The upper computer adopts a frequency agile signal generator through a GPIB or LAN program control mode, the signal frequency in the frequency agile signal generator is set to be any value between 13.16MHz and 13.96MHz, the power is set to be any value between 0.1424mW and 0.356mW, and the duration is set to be any value between 0.8ns and 2 ns. Comparing typical heavy complexity interfering signals may set the frequency at 13.56MH for a duration equal to or greater than 2ns for the interfered signal and a power equal to or greater than 0.356mW for the measured interfering signal.
Through an external transmitting antenna and a power amplifier, a complex electromagnetic interference environment with severe complexity level can be generated when the power amplification multiple equipment is 0 Db.
In summary, compared with the prior art, the method provided by the invention adopts a fast S transformation method, can simultaneously obtain four main characteristic parameters of the interfered signal, and can automatically generate four electromagnetic environments with different complexity levels, such as general complexity, mild complexity, moderate complexity and severe complexity. A complex complexity electromagnetic environment of a certain complexity level may also be generated by multiple signal sources together.
Claims (6)
1. A multi-complexity-level complex electromagnetic interference environment simulation generation method is characterized by comprising the following steps: the method comprises the following steps in sequence:
(1) carrying out rapid S transformation on the space electromagnetic signals acquired by the spectrum analyzer in real time to obtain two-dimensional time-frequency characteristic parameters of the rapid S transformation of the interfered object signals in the space electromagnetic environment: duration T1Center frequency F1Bandwidth B1Power E1；
(2) Searching a complexity parameter standard table according to the complexity grade value of the complex electromagnetic interference environment to be simulated and generated to obtain the time occupancy rate T corresponding to the complexity gradePFrequency occupancy rate FPAnd energy occupancy EP；
(3) Time occupancy T according to the complexity levelPFrequency occupancy rate FPAnd energy occupancy EPUsing the formula | T2-T1|/T1＝TP、|F2-F1|/B1＝FP、|E2|/E1＝EPCalculating the duration T of the interference signal at the complexity level2Center frequency F2Power E2The value range of (a);
(4) according to the duration T of the interfering signal2Center frequency F2Power E2The value range of the frequency agile signal generator is adopted, and interference signal generation parameters of signal frequency, power and duration in the frequency agile signal generator are set in a GPIB or LAN program control mode;
(5) and generating a complex electromagnetic interference environment corresponding to the complexity level through an external transmitting antenna and a power amplifier.
2. The method of generating a multi-complexity-level complex electromagnetic interference environment simulation of claim 1, wherein: in step (1), the fast S-transform is a short-time fourier transform fast algorithm of a signal with a gaussian function as a window function, and its expression is:
in the formula (I), the compound is shown in the specification,
is a fourier transform of the spatial electromagnetic signal x (t),
w (f', f) is the Fourier transform of a Gaussian window function ψ (t),
t is time, f' is sampling frequency, f is frequency, τ is time shift factor, and i is an imaginary number.
3. The method of generating a multi-complexity-level complex electromagnetic interference environment simulation of claim 1, wherein: in step (1), the center frequency F1The maximum corresponding frequency point of a two-dimensional time frequency matrix S (t, f) of the signal is obtained; bandwidth B1Is a center frequency F1Subtracting the lower limit frequency from the upper limit frequency when S (t, f) > 0 is nearby; duration T1At the center frequency F of the time-frequency matrix after the rapid S transformation of the interfered object signal1Near amplitude S (t)1-t2Time length of F. + -.B) > 0, t1As the end of the signal, t2Is the signal start time; power E1And the amplitude corresponding to the maximum position of the two-dimensional time frequency matrix S (t, f).
4. The method of generating a multi-complexity-level complex electromagnetic interference environment simulation of claim 1, wherein: in the step (3), | · | represents an absolute value.
5. The method of generating a multi-complexity-level complex electromagnetic interference environment simulation of claim 1, wherein: in the step (4), setting the signal frequency in the frequency agile signal generator as the center frequency F2Setting the power in the agile frequency signal generator to power E at any frequency within the range2Setting the duration in the agile frequency signal generator to the duration T2。
6. System for implementing the multi-complexity-level complex electromagnetic interference environment simulation generation method of any of claims 1 to 5, characterized by: the system comprises:
the receiving antenna adopts an omnidirectional horn antenna with the frequency of 0-40 GHz and is used for receiving electromagnetic signals with the frequency of 0-40 GHz in space;
the frequency spectrum analyzer adopts a real-time analysis instrument with frequency coverage of 0-40 GHz and is used for signal acquisition, time domain analysis and frequency domain analysis;
the upper computer is used for carrying out rapid S transformation on the acquired electromagnetic signals and calculating the duration T1Center frequency F1Bandwidth B1And power E1Controlling the frequency agile signal generator according to the calculation result, and setting interference signal generation parameters of signal frequency, power and duration in the frequency agile signal generator;
the frequency agile signal generator executes signal frequency, power and duration according to a program control instruction sent by the upper computer;
the power amplifier is used for amplifying the power of the output signal of the frequency agile signal generator, and the amplification factor is 0-50 dB;
the transmitting antenna transmits and propagates the electromagnetic signal output by the power amplifier to a free space environment;
the receiving antenna is connected with the spectrum analyzer through a radio frequency line, the spectrum analyzer is connected with the upper computer through a General Purpose Interface Bus (GPIB) or a Local Area Network (LAN), the upper computer is connected with the frequency agile signal generator through the General Purpose Interface Bus (GPIB) or the Local Area Network (LAN), the frequency agile signal generator is connected with the power amplifier through the radio frequency line, and the power amplifier is connected with the transmitting antenna through the radio frequency line.
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| CN117131232A (en) * | 2023-10-26 | 2023-11-28 | 中国人民解放军32806部队 | Automatic generation method and system for electromagnetic signal database |
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| CN117131232A (en) * | 2023-10-26 | 2023-11-28 | 中国人民解放军32806部队 | Automatic generation method and system for electromagnetic signal database |
| CN117131232B (en) * | 2023-10-26 | 2024-01-02 | 中国人民解放军32806部队 | Automatic generation method and system for electromagnetic signal database |
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