CN115694670B - Radio frequency domain virtual reality method and device based on microwave photon technology - Google Patents
Radio frequency domain virtual reality method and device based on microwave photon technology Download PDFInfo
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Abstract
The application provides a radio frequency domain virtual reality method and a device based on a microwave photon technology, wherein the method comprises the following steps: installing the device to be tested in the programmable electromagnetic space S; determining a radio frequency excitation waveform group according to an electromagnetic scene to be virtualized; calculating the filter response to be experienced before the radio frequency excitation waveform group radiates outwards from each electromagnetic radiation unit of the array A; generating a radio frequency excitation waveform group and distributing the radio frequency excitation waveform group to each electromagnetic radiation unit of the array A through optical fibers; realizing filter response by utilizing a microwave photon technology; recording various information of the equipment to be tested, analyzing and changing the electromagnetic scene to be virtualized, and repeating the steps to realize the multi-scene radio frequency domain virtual reality. The application takes the distribution and amplitude-phase processing of broadband radio frequency signals based on the microwave photon technology as a support, constructs an electromagnetic scene to be virtualized by encircling a radiation array of equipment to be tested, and realizes the virtual reality of an radio frequency domain in a smaller space.
Description
Technical Field
The application belongs to the field of radio frequency testing and simulation, and relates to a radio frequency domain virtual reality method and device based on a microwave photon technology.
Background
Virtual reality refers to a technique of immersing a user into a simulated environment by computer generation of the environment. Virtual reality may utilize data and parameters in a real or hypothetical scene to computationally generate electronic signals that are combined with various output devices to translate them into phenomena that can be felt by the user. At present, most of virtual reality uses people as users. Through VR glasses that can isolate ambient light and have the earphone that gives sound insulation effect, virtual reality can let the participant produce feeling of being personally on the scene, all has extensive application prospect in fields such as amusement and recreation, industry research and development, education training, business promotion, telemedicine.
In addition to optics and acoustics, virtual reality is also of great importance in the microwave radio frequency domain. The virtual reality technology of the radio frequency domain can test and verify the radio frequency equipment from multiple angles by constructing a flexible radio frequency electromagnetic environment, and has the outstanding advantages of high scene richness, high scene switching speed, low scene construction cost and the like compared with the traditional means. At present, some radio frequency domain testing and research means have some characteristics of radio frequency domain virtual reality, such as semi-physical radio frequency simulation [ Liu Xiao, zhao Feng, ai Xiaofeng ], radar semi-physical simulation and key technical research progress [ J ]. System engineering and electronic technology, 2020,42 (7), 1471-1477 ], electromagnetic target simulator and the like [ Chen Dong ], and several key technical researches [ D ] of electromagnetic target simulator in semi-physical simulation system, doctor's academic paper, huadong university of education, 2019 ]. However, these approaches support a generally small rf operating bandwidth, and the instantaneous bandwidth of generating, processing and transmitting signals is also inadequate, with short plates in the virtual of the signal waveform dimensions. Meanwhile, the radiation subsystem of the existing system is mostly located in a single direction, and a complex scene of multi-source and multi-angle simultaneous radiation is difficult to form.
Disclosure of Invention
In order to solve the problems in the prior art, the application provides a radio frequency domain virtual reality method based on a microwave photon technology, which comprises the following steps:
step 1, installing equipment to be tested in a programmable electromagnetic space S; the programmable electromagnetic space S is electromagnetically isolated from the outside, and an array A which is formed by M electromagnetic radiation units and surrounds the equipment to be tested is arranged on the inner wall of the programmable electromagnetic space S;
step 2, determining a radio frequency excitation waveform group { s } according to the electromagnetic scene to be virtualized n (t) |n=1, 2, …, N }; the radio frequency excitation waveform groupConsists of N radio frequency excitation waveforms s n (t) represents a waveform at time t;
step 3, calculating a radio frequency excitation waveform group { S } by combining the electromagnetic scene to be virtualized from the relative geometric relationship between the equipment to be tested and the programmable electromagnetic space S n (t) |n=1, 2, …, N } filter response H experienced before radiating outwards from each electromagnetic radiating element of array a N×M (ω)＝{H 1,1 (ω),H 1,2 (ω),…,H 1,M (ω)；H 2,1 (ω),…,H 1,M (ω)；…,H n,m (ω),…；H N,1 (ω),…,H N,M (ω) }, whereinFilter response for the mth electromagnetic radiating element to the frequency component ω in the nth waveform, n=1, 2, …, N, m=1, 2, …, M;
step 4, generating a radio frequency excitation waveform group { s } n (t) |n=1, 2, …, N }, and distributed to the electromagnetic radiation elements of array a by optical fibers;
step 5, realizing H by utilizing microwave photon technology N×M (omega) completing the RF excitation waveform group { s } of each electromagnetic radiation unit n (t) |n=1, 2, …, N } and radiating the filtered signal;
step 6, recording and analyzing various information of the equipment to be tested, wherein the various information comprises states, parameters and output signals;
and 7, changing the electromagnetic scene to be virtualized, and repeating the steps 2 to 6 to realize the multi-scene radio frequency domain virtual reality.
Further, the specific process of distributing the radio frequency excitation waveform component to each electromagnetic radiation unit through the optical fiber in the step 4 is as follows:
step 201, generating L paths of optical carriers; the L paths of optical carriers have different optical wavelengths, and the L paths of optical carriers are not less than the radio frequency excitation waveform group { s } n Number N of waveforms in (t) |n=1, 2, …, N };
step 202, using the generated RF waveform { s } n Intensity modulation of L paths of optical carriers by (y) |n=1, 2, …, N } respectivelyObtaining X= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l=1, 2, …, L } two sets of dimmed signals, each set containing L paths; part of waveforms in the modulation process can be modulated on a plurality of optical carriers; the two groups of modulated light signals satisfy the complementary relation of intensity, namely x l (t) intensity variations in phase with the corresponding RF waveform, y l (t) the intensity variation is inverted from the corresponding RF waveform, and [ x ] l (t)+y l (t)]Is a constant value that does not vary with time t;
step 203, combining the two modulated signals of X and Y into one path for transmission to obtain two paths of multiplexed signalsAnd->
And 204, transmitting the two multiplexed signals after combining to M electromagnetic radiation units through an optical branching network and multistage optical amplification.
Further, the implementation of H by utilizing microwave photon technology N×M (omega) a certain filter responseThe process of (2) is as follows:
step 301, optical wavelength division multiplexing signals from a distribution network received by an mth electromagnetic radiation unit are transmitted through an optical wavelength division demultiplexerAnd->Divided into x= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l = 1,2, …, L } two sets of dimmed signals;
step 302, x of the two groups of modulated light signals obtained by branching in step 301, which corresponds to the nth signal of the radio frequency excitation waveform group n (t) and y n (t) two paths each divided into K channels, numberedRespectively {1,2, …, K } and { K+1, K+2, …,2K }, 2K channels are obtained in total, and the amplitudes A of the 2K channels are respectively adjusted k And time delay tau k Make the followingApproximation->A corresponding web response; wherein j represents an imaginary part;
step 303, superposing optical signals on 2K channels in a non-coherent mode and sending the optical signals to a balanced photoelectric detector to realize adjustable filtering of radio frequency signals carried by the optical signals of the channels.
Further, two-way multiplexing signalAnd->And the light polarization multiplexing is combined into one path for transmission and distribution.
Further, if L paths of the L paths of modulated light signals carry the same radio frequency excitation signal, the corresponding L groups of 2 Kxl channels are jointly regulated and overlapped to achieve a more approximationIs included.
The utility model also provides a radio frequency domain virtual reality device based on microwave photon technique, include:
programmable electromagnetic space S: for housing the device to be tested and for constructing a programmable electromagnetic field; the programmable electromagnetic space S is electromagnetically isolated from the outside, and an array A which is formed by M electromagnetic radiation units and surrounds the equipment to be tested is arranged on the inner wall of the programmable electromagnetic space S;
the radio frequency excitation waveform calculation module: for determining a set of radio frequency excitation waveforms { s } according to an electromagnetic scene to be virtualized n (t) |n=1, 2, …, N }; the radio frequency excitation waveform group consists of N radio frequency excitation waveforms;
a filter response calculation module: for calculating a radio frequency excitation waveform group { S } by combining the electromagnetic scene to be virtualized from the relative geometrical relationship between the equipment to be tested and S n The waveform in (t) |n=1, 2, …, N } has a filter response H that is experienced before radiating outward from each electromagnetic radiating element in array a M×M (ω)＝{H 1,1 (ω),H 1,2 (ω),…,H 1,M (ω)；H 2,1 (ω),…,H 1,M (ω)；…,H n,m (ω),…；H N,1 (ω),…,H N,M (ω) }, whereinA filter response for the mth electromagnetic radiation unit to the frequency component ω in the nth signal;
the radio frequency signal generation and distribution module: for generating a set of radio frequency excitation waveforms { s } n (t) |n=1, 2, …, N }, and distributed to the electromagnetic radiation units by optical fibers;
m microwave photon amplitude and phase control modules: for implementing H by microwave photon techniques N×M (omega) completing the RF excitation waveform group { s } of each electromagnetic radiation unit n (t) |n=1, 2, …, N } and radiating the filtered signal;
the equipment to be tested monitoring module: the system is used for recording and analyzing various information of the equipment to be tested, wherein the various information comprises states, parameters and output signals.
Further, the radio frequency signal generating and distributing module specifically includes:
an optical carrier generating module: for generating L-way optical carriers; the L paths of optical carriers have different optical wavelengths, and the L paths of optical carriers are not less than the radio frequency excitation waveform group { s } n Number N of waveforms in (t) |n=1, 2, …, N };
waveform generation and electro-optic modulation module: for generating radio frequency waveforms { s } 1 (t),s 1 (t),…,s N (t) } and respectively modulating the intensity of the L paths of optical carriers by using the same to obtain X= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l=1, 2, …, L } two sets of dimmed signals, each set containing L paths; the modulation is overThe in-process partial waveform can be modulated on a plurality of optical carriers; the two groups of modulated light signals satisfy the complementary relation of intensity, namely x l (t) intensity variations in phase with the corresponding RF waveform, y l (t) the intensity variation is inverted from the corresponding RF waveform, and [ x ] l (t)+y l (t)]Is a constant value that does not vary with time t;
an optical multiplexing module: for combining the two modulated signals of X and Y into one path for transmission to obtain two paths of multiplexing signalsAnd->
And a light distribution module: the optical multiplexing device is used for transmitting the two multiplexed signals after combining to M electromagnetic radiation units through an optical branching network and multi-stage optical amplification.
Further, the microwave photon amplitude-phase control module specifically includes:
an optical demultiplexing module: for multiplexing optical wavelength division multiplexed signals received by an mth electromagnetic radiation unit from a distribution network by means of an optical wavelength division demultiplexerAnd->Divided into x= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l = 1,2, …, L } two sets of dimmed signals;
multichannel amplitude delay control module: x is used for enabling the n-th signal of the corresponding radio frequency excitation waveform group in the two groups of modulated light signals obtained by the optical demultiplexing module n (t) and y n (t) two paths are respectively divided into K paths, the numbers are {1,2, …, K } and { K+1, K+2, …,2K }, 2K paths are obtained in total, and the amplitudes A of the 2K paths are respectively adjusted k And time delay tau k Make the followingApproximation->A corresponding web response; wherein j represents an imaginary part;
signal superposition and photoelectric detection module: the optical signals on 2K channels are overlapped in a non-coherent mode and sent to the balance photoelectric detector, so that the adjustable filtering of radio frequency signals carried by the optical signals is realized.
Further, the radio frequency signal generating and distributing module generates two paths of multiplexing signalsAnd->And the light polarization multiplexing is combined into one path for transmission and distribution.
Further, in the microwave photon amplitude-phase control module, if p paths of the L paths of modulated optical signals carry the same radio frequency excitation signal, the corresponding p groups of 2k×p channels are jointly regulated and overlapped to achieve a more approximationWherein p=2, 3, …, L.
Compared with the prior art, the application has the following technical effects:
1. according to the application, through controlling the emission signals of the electromagnetic radiation units, complex radiation waves in an expected scene are synthesized in a slightly larger space than the to-be-tested radio frequency equipment, the limitations that the radiation direction is single and far field conditions need to be met in the prior art are overcome, the construction of complex scenes such as multiple sources, multiple angles, simultaneous radiation and the like can be supported, and the land and house cost of the radio frequency equipment test and virtual simulation can be greatly saved;
2. the application realizes the distribution of the excitation signal and the amplitude, phase and delay control by utilizing the microwave photon technology, can obviously expand the bandwidth of the radio frequency virtual reality system, and can meet the radio frequency test and verification requirements in the complex electromagnetic scene of all directions and wide frequency.
Drawings
Fig. 1 is a schematic diagram of a radio frequency domain virtual reality device according to an embodiment of the application.
Fig. 2 is a schematic diagram of a radio frequency signal generating and distributing module according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a part of a radio frequency signal generating and distributing module when optical polarization multiplexing is adopted in the embodiment of the application.
Fig. 4 is a schematic diagram of a microwave photon amplitude and phase control module at each electromagnetic radiation unit according to an embodiment of the present application.
Detailed Description
Aiming at the problems of high land requirement, single realizable scene, narrow working frequency band and the like of the conventional radio frequency test and virtual method, the idea of the application is to construct an electromagnetic scene to be virtualized by encircling a radiation array of equipment to be tested by taking distribution and amplitude-phase processing of broadband radio frequency signals based on a microwave photon technology as a support, and realize virtual reality of an radio frequency domain in a smaller space.
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application discloses a radio frequency domain virtual reality method based on a microwave photon technology, which comprises the following steps:
step 1, installing equipment to be subjected to radio frequency test (equipment to be tested for short) in a programmable electromagnetic space S; the programmable electromagnetic space S is electromagnetically isolated from the outside, and an array A which is formed by M electromagnetic radiation units and surrounds the equipment to be tested is arranged on the inner wall of the programmable electromagnetic space S;
step 2, determining a radio frequency excitation waveform group { s } according to the electromagnetic scene to be virtualized n (t) |n=1, 2, …, N }; the radio frequency excitation waveform group consists of N radio frequency excitation waveforms s n (t) represents a waveform at time t;
step 3, calculating a radio frequency excitation waveform group { S } by combining the electromagnetic scene to be virtualized from the relative geometric relationship between the equipment to be tested and the programmable electromagnetic space S n (t) |n=1, 2, …, N } filter responses experienced before radiating outwards from the individual electromagnetic radiating elements of array a, in particular using H N×M (ω) wherein H N×M (ω)＝{H 1,1 (ω),H 1,2 (ω),…,H 1,M (ω)；H 2,1 (ω),…,H 1,M (ω)；…,H n,m (ω),…；H N,1 (ω),…,H N,M (ω)}，A filter response for the mth electromagnetic radiating element to the frequency component ω in the nth waveform; n=1, 2, …, N, m=1, 2, …, M;
step 4, generating a radio frequency excitation waveform group { s } n (t) |n=1, 2, …, N }, and distributed to the electromagnetic radiation elements of array a by optical fibers;
step 5, realizing H by utilizing microwave photon technology N×M (omega) completing the RF excitation waveform group { s } of each electromagnetic radiation unit n (t) |n=1, 2, …, N } and radiating the filtered signal;
step 6, recording and analyzing various information of the equipment to be tested, wherein the various information comprises states, parameters and output signals;
and 7, changing the electromagnetic scene to be virtualized, and repeating the steps 2 to 6 to realize the multi-scene radio frequency domain virtual reality.
Preferably, in the proposed rf domain virtual reality method, the specific process of distributing the rf excitation waveform component to each electromagnetic radiation unit through the optical fiber in step 4 is as follows:
step 201, generating L paths of optical carriers; the L paths of optical carriers have different optical wavelengths, and the L paths of optical carriers are not less than the radio frequency excitation waveform group { s } n Number N of waveforms in (t) |n=1, 2, …, N };
step 202, using the generated RF waveform set { s } n The waveforms in (t) |n=1, 2, …, N } respectively perform intensity modulation on the L paths of optical carriers to obtain x= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l=1, 2, …, L } two sets of dimmed signals, each set containing L paths; part of waveforms in the modulation process can be modulated on a plurality of optical carriers; the two groups of modulated light signals satisfy the complementary relation of intensity, namely x l (t) intensity variations in phase with the corresponding RF waveform, y l (t) the intensity variation is inverted from the corresponding RF waveform, and [ x ] l (t)+y l (t)]Is a constant value that does not vary with time t;
step 203, combining the two modulated signals of X and Y into one path for transmission to obtain two paths of multiplexed signalsAnd->
And 204, transmitting the two multiplexed signals after combining to M electromagnetic radiation units through an optical branching network and multistage optical amplification.
Preferably, in the proposed rf domain virtual reality method, H is implemented in step 5 using microwave photon technology N×M (omega) a certain filter responseThe process of (2) is as follows:
step 301, optical wavelength division multiplexing signals from a distribution network received by an mth electromagnetic radiation unit are transmitted through an optical wavelength division demultiplexerAnd->Divided into x= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l = 1,2, …, L } two sets of dimmed signals;
step 302, x of the two groups of modulated light signals obtained by branching in step 301, which corresponds to the nth signal of the radio frequency excitation waveform group n (t) and y n (t) two paths are respectively divided into K paths, the numbers are {1,2, …, K } and { K+1, K+2, …,2K }, 2K paths are obtained in total, and the amplitudes A of the 2K paths are respectively adjusted k And time delay tau k Make the followingApproximation->A corresponding web response; wherein j represents an imaginary part; the approximation is determined in actual condition;
step 303, superposing optical signals on 2K channels in a non-coherent mode and sending the optical signals to a balanced photoelectric detector to realize adjustable filtering of radio frequency signals carried by the optical signals of the channels.
Preferably, in the proposed radio frequency domain virtual reality method, the signals are multiplexed in two waysAnd->And the light polarization multiplexing is combined into one path for transmission and distribution.
Preferably, in the proposed rf domain virtual reality method, if p paths of the L paths of modulated optical signals carry the same rf excitation signal, the corresponding p groups of 2 kxp channels are jointly adjusted and superimposed to achieve a more approximate approachWherein p=2, 3, …, L.
As shown in fig. 1, the embodiment of the present application further provides a radio frequency domain virtual reality device based on microwave photon technology, which includes:
programmable electromagnetic space S: the device is used for accommodating equipment to be subjected to radio frequency testing and constructing a programmable electromagnetic field; the S is electromagnetically isolated from the outside, and an array A which is formed by M electromagnetic radiation units and surrounds the equipment to be tested is arranged on the inner wall of the S; the programmable electromagnetic space S is a three-dimensional closed space and is not limited to be a sphere;
the radio frequency excitation waveform calculation module: for determining a set of radio frequency excitation waveforms { s } according to an electromagnetic scene to be virtualized n (t) |n=1, 2, …, N }; the radio frequency excitation waveform group consists of N radio frequency excitation waveforms;
a filter response calculation module: for calculating a radio frequency excitation waveform group { S } by combining the electromagnetic scene to be virtualized from the relative geometrical relationship between the equipment to be tested and S n The waveform in (t) |n=1, 2, …, N } has a filter response H that is experienced before radiating outward from each electromagnetic radiating element in array a N×M (ω)＝{H 1,1 (ω),H 1,2 (ω),…,H 1,M (ω)；H 2,1 (ω),…,H 1,M (ω)；…,H n,m (ω),…；H N,1 (ω),…,H N,M (ω) }, whereinA filter response for the mth electromagnetic radiation unit to the frequency component ω in the nth signal;
the radio frequency signal generation and distribution module: for generating a set of radio frequency excitation waveforms { s } n (t) |n=1, 2, …, N }, and distributed to the electromagnetic radiation units by optical fibers;
m microwave photon amplitude and phase control modules: for implementing H by microwave photon techniques N×M (omega) completing the RF excitation waveform group { s } of each electromagnetic radiation unit n (t) |n=1, 2, …, N } and radiating the filtered signal;
the equipment to be tested monitoring module: the device is used for recording and analyzing the state, parameters, output signals and the like of the device to be tested.
Preferably, the radio frequency signal generating and distributing module specifically includes:
an optical carrier generating module: for generating L-way optical carriers; the L paths of optical carriers have different optical wavelengths, and the L paths of optical carriers are not less than the radio frequency laserExcitation waveform group { s ] n Number N of waveforms in (t) |n=1, 2, …, N };
waveform generation and electro-optic modulation module: for generating sets of radio frequency waveforms { s } n Waveforms in (t) |n=1, 2, …, N } and intensity modulating the L paths of optical carriers with the waveforms respectively, to obtain x= { X 1 (t),x 2 (t),…x L (t) } and y= { Y 1 (t),y 2 (t),…,y L (t) } two sets of dimmed signals, each set having L paths; part of waveforms in the modulation process can be modulated on a plurality of optical carriers; the two groups of modulated light signals satisfy the complementary relation of intensity, namely x l (t) intensity variations in phase with the corresponding RF waveform, y l (t) the intensity variation is inverted from the corresponding RF waveform, and [ x ] l (t)+y l (t)]Is a constant value that does not vary with time t, where l=1, 2, …, L;
an optical multiplexing module: for combining the two modulated signals of X and Y into one path for transmission to obtain two paths of multiplexing signalsAnd->
And a light distribution module: the optical multiplexing device is used for transmitting the two multiplexed signals after combining to M electromagnetic radiation units through an optical branching network and multi-stage optical amplification.
Preferably, the microwave photon amplitude-phase control module specifically includes:
an optical demultiplexing module: for multiplexing optical wavelength division multiplexed signals received by an mth electromagnetic radiation unit from a distribution network by means of an optical wavelength division demultiplexerAnd->Divided into x= { X 1 (t),x 2 (t),…x L (t) } and y= { Y 1 (t),y 2 (t),…,y L (t) } two groupsA dimmed signal;
multichannel amplitude delay control module: x is used for enabling the n-th signal of the corresponding radio frequency excitation waveform group in the two groups of modulated light signals obtained by the optical demultiplexing module n (t) and y n (t) two paths are respectively divided into K paths, the numbers are {1,2, …, K } and { K+1, K+2, …,2K }, 2K paths are obtained in total, and the amplitudes A of the 2K paths are respectively adjusted k And time delay tau k Make the followingApproximation->A corresponding web response; wherein j represents an imaginary part;
signal superposition and photoelectric detection module: the optical signals on 2K channels are overlapped in a non-coherent mode and sent to the balance photoelectric detector, so that the adjustable filtering of radio frequency signals carried by the optical signals is realized.
Preferably, in the proposed rf domain virtual reality device, the rf signal generating and distributing module generates two-way multiplexing signalsAnd->The light polarization multiplexing can be combined into one path for transmission and distribution.
Preferably, in the proposed rf domain virtual reality device, for the microwave photon amplitude-phase control module, if L paths of the L paths of modulated optical signals carry the same rf excitation signal, 2kχ L channels in total of the corresponding L groups may be jointly adjusted and superimposed to achieve a more approximate approachIs included.
In order to facilitate the public understanding, the following description of the present application will be given in further detail with reference to a preferred embodiment.
Broadband radiation signals from two directions alpha and beta in a distant place are contained in an electromagnetic environment to be virtualized, and the corresponding waveforms are s respectively 1 (t) and s 2 (t). Since the electromagnetic scene to be virtualized is in the far field region of the two radiation sources, two plane waves corresponding to α and β should be generated in the programmable electromagnetic space. However, due to the geometry of the programmable electromagnetic space, the electromagnetic environment in the rf domain virtual reality system is generally located in the near field region of the inner wall radiating array of the programmable electromagnetic space, and it is difficult to directly generate plane waves. For this purpose, an equivalent planar wavefront can be formed in the near field by plane wave synthesis techniques of the radiating array. In this process, the generated signal waveforms are first transmitted and distributed to the individual elements of the radiating array via the feed network. And then, calculating the amplitude and the phase of each array element radiation signal in the array according to the geometric layout of the array and the wave vector direction of the plane wave, and regulating the amplitude and the phase of the signal according to the amplitude and the phase. Because the signal waveform has a larger bandwidth, in order to realize plane wave synthesis of a wide frequency band, control parameters of the amplitude and the phase of the radiation signal should be designed for different frequency components in the wide frequency band respectively.
The application adopts the microwave photon technology to realize s 1 (t) and s 2 (t) feeding transmission and distribution of two signal waveforms, and completion of the pair s in each electromagnetic radiation unit 1 (t) and s 2 And (t) amplitude and phase control. As shown in fig. 2, first, an optical carrier generating module generates L paths of optical carriers {1,2, …, L } with different wavelengths, where {3,4, …, L } is an idle optical carrier, which can be used to improve the performance of amplitude-phase regulation. In a dual output electro-optic intensity modulator, s is used 1 (t) modulating the optical carrier 1 to generate two paths of modulated optical signals x with complementary intensities 1 (t) and y 1 (t); at the same time use s 2 (t) modulating the optical carrier 2 to generate two paths of modulated optical signals x with complementary intensities 2 (t) and y 2 (t). Let us set x 1 (t) and x 2 (t) in phase with the corresponding electrical signal, y 1 (t) and y 2 (t) is in anti-phase with the corresponding electrical signal. Using optical wavelength division multiplexing, x 1 (t) and x 2 (t) combining into one pathWill y 1 (t) and y 2 (t) one way->Afterwards, the optical multiplexing signal is +.>Andtransmitted to each unit of the radiation array through the optical power dividing and amplifying network.
It is worth mentioning that, with electro-optical polarization modulation and optical polarization multiplexing,and->The two signals may be combined into one for transmission, as shown in fig. 3. An electro-optic polarization modulator may be considered as a combination of two phase modulators with opposite modulation indices on the principal axes of two orthogonal polarizations. In this way, two modulated signals with complementary modulation characteristics can be transmitted in parallel along the two polarization principal axes of the optical fiber, respectively. Since the polarization and the wavelength of light are decoupled, the optical wavelength division multiplexing shown in fig. 2 can be implemented after polarization multiplexing is used. When the polarization multiplexing signal is transmitted to the array element, the polarization beam splitter can be used for splitting the signal at an analysis angle of 45 degrees, so that two paths of mutually separated intensity modulation signals with complementary characteristics can be obtained>And->As shown in fig. 4, a #>Andafter being transmitted to each unit, the optical wave is divided into x by an optical wave demultiplexer 1 (t)、x 2 (t) and y 1 (t)、y 2 (t). In order to achieve amplitude-modulated phase processing of the signal, delay filter taps have to be constructed for each radio frequency waveform. Specifically, in the form of signal waveform s 1 (t) for example, will be equal to s 1 (t) corresponding dimmed signal x 1 (t) and x 2 And (t) respectively dividing the signals into K paths, and respectively adjusting the delay and the amplitude of the obtained 2K paths of signals to form 2K adjustable filter taps. And adding the intensity envelopes of the 2K paths of optical signals through non-coherent synthesis of an optical domain, and performing photoelectric conversion to complete the control of the broadband amplitude and phase of the signals. Due to x 1 (t) and y 1 (t) having complementary modulation characteristics, of 2K adjustable filter taps, and x 1 (t) the corresponding K taps have positive coefficients, y 1 (t) the corresponding K taps have negative coefficients. Because both positive and negative tap coefficients can be realized, when the value K is large enough and the delay and amplitude control accuracy is sufficient, the formed filter response is +.> The response of various filters such as low pass, high pass, band stop, all pass delay, all pass phase shift, dispersion and matched pulse pressure can be approximated. If the expected filter response is so complex that the 2K tap approximations are not ideal, the corresponding waveform may be modulated on the (p-1) Lu Kongxian optical carrier. In this way, the corresponding channel may additionally introduce 2 (p-1) K filter taps, the total number of taps may reach 2Kp, where p=2, 3, …, L. The processed waveform can be used as the emission signal of the unit to radiate to the programmable electromagnetic space for forming the expected electromagnetic scene and completing the virtual reality of the radio frequency domain.
The application can realize the equipment test and research under the wide-band complex electromagnetic scene in a smaller space, thereby solving the problems of limited bandwidth, single simulation scene, high field requirement and the like in the prior art.
Compared with the prior art, the application has the following beneficial effects:
1. the complex radiation wave in the expected scene can be synthesized in a slightly larger space than the to-be-tested radio frequency equipment by controlling the emission signals of each electromagnetic radiation unit, so that the limitations that the radiation direction is single and far field conditions need to be met in the prior art are overcome, and the cost of the ground and the house for testing and virtual simulation of the radio frequency equipment is greatly saved while the construction of complex scenes such as multiple sources, multiple angles, simultaneous radiation and the like is supported;
2. the microwave photon technology is utilized to realize the distribution of excitation signals and the control of amplitude, phase and delay, so that the bandwidth of the radio frequency virtual reality system can be remarkably expanded, and the radio frequency test and verification requirements under the complex electromagnetic scene with all directions and wide frequency can be met.
The terms "first," "second," "third," "fourth," and the like in the description of the application and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided by the present application, it should be understood that the disclosed systems and apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or partly in the form of a software product, or all or part of the technical solution, which is stored in a storage medium, and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the rf domain virtual reality method based on microwave photon technology according to various embodiments of this application. And the aforementioned storage medium includes: u disk, mobile hard disk, read-only memory (ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The radio frequency domain virtual reality method based on the microwave photon technology is characterized by comprising the following steps of:
step 1, installing equipment to be tested in a programmable electromagnetic space S; the programmable electromagnetic space S is electromagnetically isolated from the outside, and an array A which is formed by M electromagnetic radiation units and surrounds the equipment to be tested is arranged on the inner wall of the programmable electromagnetic space S;
step 2, determining a radio frequency excitation waveform group { s } according to the electromagnetic scene to be virtualized n (t) |n=1, 2, …, N }; the radio frequency excitation waveform group consists of N radio frequency excitation waveforms s n (t) represents a waveform at time t;
step 3, calculating a radio frequency excitation waveform group { S } by combining the electromagnetic scene to be virtualized from the relative geometric relationship between the equipment to be tested and the programmable electromagnetic space S n (t) |n=1, 2, …, N } from each electromagnetic radiation sheet of array aThe filter response H to be experienced before the outward radiation in the element N×M (ω)＝{H 1,1 (ω),H 1,2 (ω),…,H 1,M (ω)；H 2,1 (ω),…,H 2,M (ω)；…,H n,m (ω),…；H N,1 (ω),…,H N,M (ω) }, wherein H n,m (ω) is the filter response of the mth electromagnetic radiation unit to the frequency component ω in the nth waveform, n=1, 2, …, N, m=1, 2, …, M;
step 4, generating a radio frequency excitation waveform group { s } n (t) |n=1, 2, …, N }, and distributed to the electromagnetic radiation elements of array a by optical fibers;
step 5, realizing H by utilizing microwave photon technology N×M (omega) completing the RF excitation waveform group { s } of each electromagnetic radiation unit n (t) |n=1, 2, …, N } and radiating the filtered signal;
step 6, recording and analyzing various information of the equipment to be tested, wherein the various information comprises states, parameters and output signals;
and 7, changing the electromagnetic scene to be virtualized, and repeating the steps 2 to 6 to realize the multi-scene radio frequency domain virtual reality.
2. The method of virtual reality in radio frequency domain based on microwave photon technology according to claim 1, wherein the specific process of distributing radio frequency excitation waveform components to each electromagnetic radiation unit through optical fiber in step 4 is as follows:
step 201, generating L paths of optical carriers; the L paths of optical carriers have different optical wavelengths, and the L paths of optical carriers are not less than the radio frequency excitation waveform group { s } n Number N of waveforms in (t) |n=1, 2, …, N };
step 202, using the generated RF waveform { s } n Intensity modulation is respectively carried out on L paths of optical carriers by (t) |n=1, 2, … and N, so that X= { X is obtained l (t) |l=1, 2, …, L } and y= { Y l (t) |l=1, 2, …, L } two sets of dimmed signals, each set containing L paths; part of waveforms in the modulation process can be modulated on a plurality of optical carriers; the two groups of modulated light signals satisfy the complementary relation of intensity, namely x l (t) intensity variation and corresponding radio frequencyWaveform in phase, y l (t) the intensity variation is inverted from the corresponding RF waveform, and [ x ] l (t)+y l (t)]Is a constant value that does not vary with time t;
step 203, combining the two modulated signals of X and Y into one path for transmission to obtain two paths of multiplexed signalsAnd->
And 204, transmitting the two multiplexed signals after combining to M electromagnetic radiation units through an optical branching network and multistage optical amplification.
3. The method for virtual reality of a radio frequency domain based on microwave photon technology according to claim 1, wherein the implementation of H is achieved by microwave photon technology N×M (ω) a certain filter response H n,m The process of (ω) is specifically as follows:
step 301, optical wavelength division multiplexing signals from a distribution network received by an mth electromagnetic radiation unit are transmitted through an optical wavelength division demultiplexerAnd->Divided into x= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l = 1,2, …, L } two sets of dimmed signals;
step 302, x of the two groups of modulated light signals obtained by branching in step 301, which corresponds to the nth signal of the radio frequency excitation waveform group n (t) and y n (t) two paths are respectively divided into K paths, the numbers are {1,2, …, K } and { K+1, K+2, …,2K }, 2K paths are obtained in total, and the amplitudes A of the 2K paths are respectively adjusted k And time delay tau k Make the followingApproximation H n,m (ω) corresponding web response; wherein j represents an imaginary part;
step 303, superposing optical signals on 2K channels in a non-coherent mode and sending the optical signals to a balanced photoelectric detector to realize adjustable filtering of radio frequency signals carried by the optical signals of the channels.
4. The method of virtual reality in radio frequency domain based on microwave photon technology according to claim 2, characterized in that two paths of multiplexed signalsAnd->And the light polarization multiplexing is combined into one path for transmission and distribution.
5. The method of claim 3, wherein if L paths of the L paths of modulated light signals carry the same radio frequency excitation signal, 2 Kxl channels in total are combined and superimposed to achieve a more approximate H n,m (ω) a filter response.
6. The utility model provides a radiofrequency domain virtual reality device based on microwave photon technique which characterized in that includes:
programmable electromagnetic space S: for housing the device to be tested and for constructing a programmable electromagnetic field; the programmable electromagnetic space S is electromagnetically isolated from the outside, and an array A which is formed by M electromagnetic radiation units and surrounds the equipment to be tested is arranged on the inner wall of the programmable electromagnetic space S;
the radio frequency excitation waveform calculation module: for determining a set of radio frequency excitation waveforms { s } according to an electromagnetic scene to be virtualized n (t) |n=1, 2, …, N }; the radio frequency excitation waveform group consists of N radio frequency excitation waveforms;
a filter response calculation module: for calculating a radio frequency excitation waveform group { S } by combining the electromagnetic scene to be virtualized from the relative geometrical relationship between the equipment to be tested and S n Waves in (t) |n=1, 2, …, N }Form a filter response H to be experienced before radiating outwards from each electromagnetic radiating element in array A N×M (ω)＝{H 1,1 (ω),H 1,2 (ω),…,H 1,M (ω)；H 2,1 (ω),…,H 2,M (ω)；…,H n,m (ω),…；H N,1 (ω),…,H N,M (ω) }, wherein H n,m (ω) is the filter response of the mth electromagnetic radiation unit to the frequency component ω in the nth signal;
the radio frequency signal generation and distribution module: for generating a set of radio frequency excitation waveforms { s } n (t) |n=1, 2, …, N }, and distributed to the electromagnetic radiation units by optical fibers;
m microwave photon amplitude and phase control modules: for implementing H by microwave photon techniques N×M (omega) completing the RF excitation waveform group { s } of each electromagnetic radiation unit n (t) |n=1, 2, …, N } and radiating the filtered signal;
the equipment to be tested monitoring module: the system is used for recording and analyzing various information of the equipment to be tested, wherein the various information comprises states, parameters and output signals.
7. The device of claim 6, wherein the radio frequency signal generation and distribution module specifically comprises:
an optical carrier generating module: for generating L-way optical carriers; the L paths of optical carriers have different optical wavelengths, and the L paths of optical carriers are not less than the radio frequency excitation waveform group { s } n Number N of waveforms in (t) |n=1, 2, …, N };
waveform generation and electro-optic modulation module: for generating radio frequency waveforms { s } 1 (t),s 2 (t),…,s N (t) } and respectively modulating the intensity of the L paths of optical carriers by using the same to obtain X= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l=1, 2, …, L } two sets of dimmed signals, each set containing L paths; part of waveforms in the modulation process can be modulated on a plurality of optical carriers; the two groups of modulated light signals satisfy the complementary relation of intensity, namely x l (t) intensity variations in phase with the corresponding RF waveform, y l (t)Is inverted from the corresponding RF waveform, and x l (t)+y l (t)]Is a constant value that does not vary with time t;
an optical multiplexing module: for combining the two modulated signals of X and Y into one path for transmission to obtain two paths of multiplexing signalsAnd->
And a light distribution module: the optical multiplexing device is used for transmitting the two multiplexed signals after combining to M electromagnetic radiation units through an optical branching network and multi-stage optical amplification.
8. The rf domain virtual reality device of claim 6, wherein the microwave photon amplitude and phase control module specifically comprises:
an optical demultiplexing module: for multiplexing optical wavelength division multiplexed signals received by an mth electromagnetic radiation unit from a distribution network by means of an optical wavelength division demultiplexerAnd->Divided into x= { X l (t) |l=1, 2, …, L } and y= { Y l (t) |l = 1,2, …, L } two sets of dimmed signals;
multichannel amplitude delay control module: x is used for enabling the n-th signal of the corresponding radio frequency excitation waveform group in the two groups of modulated light signals obtained by the optical demultiplexing module n (t) and y n (t) two paths are respectively divided into K paths, the numbers are {1,2, …, K } and { K+1, K+2, …,2K }, 2K paths are obtained in total, and the amplitudes A of the 2K paths are respectively adjusted k And time delay tau k Make the followingApproximation H n,m (omega) corresponding amplitude phaseResponding; wherein j represents an imaginary part;
signal superposition and photoelectric detection module: the optical signals on 2K channels are overlapped in a non-coherent mode and sent to the balance photoelectric detector, so that the adjustable filtering of radio frequency signals carried by the optical signals is realized.
9. The microwave photon technology based rf domain virtual reality device according to claim 7, wherein the rf signal generating and distributing module generates two-way multiplexing signalsAnd->And the light polarization multiplexing is combined into one path for transmission and distribution.
10. The device of claim 8, wherein, in the microwave photon amplitude-phase control module, if p paths of the L paths of modulated light signals carry the same rf excitation signal, the corresponding p groups of 2 kxp channels are jointly adjusted and superimposed to achieve a more approximate H n,m (ω), wherein p=2, 3, …, L.
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| CN114296033A (en) * | 2021-12-23 | 2022-04-08 | 中国电子科技集团公司第十四研究所 | Light-operated receiving beam forming method and device |
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| CN113039475A (en) * | 2018-09-28 | 2021-06-25 | 交互数字Ce专利控股公司 | Device for radiating at least one outgoing electromagnetic wave when irradiated by an incident electromagnetic wave |
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