CN115695129A - Sideband radiation suppression method for time modulation array and antenna system - Google Patents
Sideband radiation suppression method for time modulation array and antenna system Download PDFInfo
- Publication number
- CN115695129A CN115695129A CN202211021455.2A CN202211021455A CN115695129A CN 115695129 A CN115695129 A CN 115695129A CN 202211021455 A CN202211021455 A CN 202211021455A CN 115695129 A CN115695129 A CN 115695129A
- Authority
- CN
- China
- Prior art keywords
- radiation
- probability
- time
- radio frequency
- sideband
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001629 suppression Effects 0.000 title claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 6
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 238000010586 diagram Methods 0.000 claims description 13
- 238000001228 spectrum Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 5
- 238000003491 array Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 6
- 238000005457 optimization Methods 0.000 abstract description 5
- 230000000737 periodic effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000002922 simulated annealing Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention provides a sideband radiation suppression method for a time modulation array and an antenna system, which mainly comprise an antenna unit, N radio frequency power amplifiers, N phase shifters, 1 probability-based time modulator, 1 divide-by-1M power divider, 1 baseband signal generator, 1 mixer, 1 local vibration source and a controller. Compared with the traditional time modulation array, the time modulation waveform of the invention is a non-periodic random time sequence, thereby reducing the sideband radiation level to the maximum extent; after the probability that each antenna unit is in a radial state is determined, the corresponding time sequence can be randomly generated without a complex optimization algorithm; according to the time modulation array, the radiation signals have the direction modulation characteristic, namely the radiation signals are different for different angles, and the time modulation array can be used for a physical layer secret wireless communication system; the method has the greatest advantages that the sideband radiation signals are extremely similar to additive white Gaussian noise and have extremely high randomness.
Description
Technical Field
The invention relates to the technical field of antenna engineering, in particular to a sideband radiation suppression method for a time modulation array, which can be used in the fields of radar and communication requiring low sidelobe and low sideband directional diagrams, and can also be used in radio frequency stealth and physical layer secret communication systems.
Background
In the practical engineering application scenarios of modern radar and communication, it is often necessary that the radiation pattern of the antenna array is low sidelobe in order to reduce interference between signals or to reduce the risk of the transmitted signal being received by an eavesdropper. However, it is extremely difficult for the conventional phased array to achieve an ultra-low sidelobe radiation pattern. The time modulation array is a new technology for realizing an ultra-low side lobe radiation pattern through a time averaging idea. The Time modulation array is proposed in 1963 by w.h. kummer in "Ultra-Low delay from Time-Modulated Arrays", which introduces a Time-dependent fourth-dimensional variable into a conventional antenna array, and equivalently controls the average power fed into a port of each antenna unit according to the conduction Time of each antenna unit, thereby realizing a radiation pattern with an extremely Low side lobe level at a central frequency point. However, since each antenna element uses a periodic time modulated waveform, a series of sideband emissions are accompanied near the center frequency of the emissions. For reception, the sideband radiation may interfere with the desired received signal, affecting the performance of the received signal.
In order to suppress sideband radiation while realizing a side lobe radiation pattern, a number of methods for suppressing sideband radiation have been proposed in the literature. Studies were mainly performed from two angles as entry points: one is to research high-efficiency optimization algorithms, such as genetic algorithm, differential evolution algorithm, particle swarm algorithm, simulated annealing algorithm and the like, and optimize the radiation level of the sideband; one is to explore more freedom of time modulation waveform design, and besides the traditional pulse width, the method also comprises the steps of pulse translation, pulse shaping, pulse splitting, binary optimization time sequence, non-uniform time modulation and the like. At present, the simplest and most effective method is non-uniform Time Modulation, which was first proposed in 2015 by C.He et al in the text "wideband Radiation Level in Time-Modulated Array by non-null Period Modulation". Compared with the prior uniform time modulation frequency, the technology adopts different time modulation frequencies for different antenna units, so that the frequencies of harmonic radiation generated by different antenna units are different, and the harmonic radiation cannot be effectively superposed in a free space naturally, so that sideband radiation can be greatly inhibited on the premise of not needing a complex optimization method. All current methods for sideband radiation suppression are developed based on the premise of a periodic time modulation scheme. It is known that for a periodic waveform, transformed into the frequency domain by a fourier transform, there is always a series of discrete spectra, which is fundamental to the generation of sideband radiation by a time-modulated array. Although non-uniform time modulation techniques do not allow effective superposition of the sideband radiation from different antenna elements, significant harmonic radiation still occurs.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a method of sideband radiation suppression for a time modulation array and an antenna system.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a sideband radiation suppression method for a time modulation array is disclosed, wherein a corresponding time modulation array antenna system comprises N antenna units 1, N radio frequency power amplifiers 2, N phase shifters 3, 1 probability-based time modulator 4, 1 divide-by- 1M power divider 5, 1 baseband signal generator 6, 1 mixer 7, 1 local vibration source 8 and a controller 9, wherein N and M are positive integers, and M is less than or equal to N;
the probability-based time modulator 4 is provided with M input ports and N output ports, and the nth output port is connected with the phase shifter 3, the radio frequency power amplifier 2 and the antenna unit 1 in sequence; the mth input port of the probability-based time modulator 4 is connected with the mth output port of the 1-division-M power divider 5; a baseband signal generator 6 generates a baseband signal carrying information and a radio frequency signal generated by a local vibration source 8, the baseband signal and the radio frequency signal are up-converted to a radio frequency domain through a frequency mixer 7, and an output port of the frequency mixer 7 is connected with an input port of a 1-division M power divider 5; the states of the N output ports of the probability-based time modulator 4 are controlled by the controller 9;
the nth antenna unit 1 is represented by p n Is in the radiating state, at 1-p n Is in a silent state, where 0 ≦ p n 1,n is an integer from 1 to N and M is an integer from 1 to M.
Preferably, each antenna unit is controlled by a radio frequency switch to work; the shape of the central frequency point radiation directional diagram can be controlled by controlling the size of the conduction probability; the time modulation of each antenna element is aperiodic such that the sideband radiation is approximately white gaussian noise with a flat radiated power spectrum, thereby suppressing the sideband radiation level to a maximum extent.
Preferably, the method comprises the steps of:
s0, initializing an array structure, wherein the array structure comprises the design of an antenna unit 1, the selection of the number N of array elements, the layout of an antenna array, the minimum on-time length tau of a switch, and setting the maximum iteration number K to be more than or equal to 1000 and the current iteration number K =0;
s1, calculating excitation w of the nth antenna unit by using a computer according to a directional diagram expected to be radiated n N =1.. N, so as to obtain the probability p of conduction thereof n ＝|w n I, complex excitation w n The phase of (c) is realized by a phase shifter 3, |, modulo operator;
s2, randomly generating N distribution intervals [0,1 ] by using the controller 9 during the kth iteration]The nth element of the random number is denoted as r n If r is n ≤p n Then the nth antenna element 1 is in radiation mode, otherwise in silent mode, with iteration number k = k +1;
and S3, judging whether K is less than or equal to K, if so, repeating the step S2, and obtaining the working states of the antenna units at other optional moments, otherwise, ending the control of the time modulator 4 based on the probability.
Preferably, the radiation signal is subjected to different time modulations in different radiation directions, and the radiation signal has a direction modulation characteristic.
Preferably, the generated sideband signal has a flat power spectrum as additive white gaussian noise.
The invention also provides a time modulation array antenna system, which comprises N antenna units 1, N radio frequency power amplifiers 2, N phase shifters 3, 1 probability-based time modulator 4, 1 power divider 5 with 1 division M, 1 baseband signal generator 6, 1 mixer 7, 1 local vibration source 8 and a controller 9, wherein N and M are positive integers, and M is less than or equal to N;
the probability-based time modulator 4 is provided with M input ports and N output ports, and the nth output port is connected with the phase shifter 3, the radio frequency power amplifier 2 and the antenna unit 1 in sequence; m input ports of the probability-based time modulator 4 are connected with M output ports of the 1-minute-M power divider 5; a baseband signal generator 6 generates a baseband signal carrying information and a radio frequency signal generated by a local vibration source 8, the baseband signal and the radio frequency signal are up-converted to a radio frequency domain through a frequency mixer 7, and the output of the frequency mixer 7 is connected with an input port of a 1-division-M power divider 5; the states of the N output ports of the probability-based time modulator 4 are controlled by the controller 9;
the nth antenna unit 1 is represented by p n Is in a radiating state, by 1-p n Is in a silent state, where 0 ≦ p n 1,n is an integer from 1 to N and M is an integer from 1 to M.
Compared with the prior art, the invention has the beneficial effects that:
1) Compared with the traditional time modulation array, the time modulation waveform adopted by the invention is a random time sequence with periodicity, so that the sideband radiation level is reduced to the maximum extent; 2) After the probability that each antenna unit is in a radial state is determined, the corresponding time sequence can be randomly generated without a complex optimization algorithm; 3) According to the time modulation array, the radiation signals have the direction modulation characteristic, namely the radiation signals are different for different angles, and the time modulation array can be used for a physical layer secret wireless communication system; 4) The method has the greatest advantage that the sideband radiation signal is extremely similar to the additive white Gaussian noise and has extremely high randomness.
Drawings
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a spatial radiation power spectrum in the angle-frequency dimension of the present invention;
FIG. 3 is the variation of the Average Radiated Power (ARP) with angle for the present invention;
FIG. 4 is a center frequency point radiation pattern and a sideband radiation peak pattern for the-40 dB sidelobe of the present invention;
FIG. 5 is a far field radiation first order statistical property of the present invention: the real and imaginary parts of the mean;
FIG. 6 is a far field radiation second order statistical property of the present invention: four elements of a covariance matrix of order 2;
FIG. 7 is a constellation of the radiation field of the present invention at 8 degrees and its corresponding Gaussian fit (with the upper right being the Gaussian fit for the in-phase component and the lower right being the Gaussian fit for the quadrature component);
FIG. 8 is a constellation of the radiation field of the present invention at 65 degrees and its corresponding Gaussian fit (upper right is the Gaussian fit for the in-phase component and lower right is the Gaussian fit for the quadrature component);
FIG. 9 shows the symbol error rate of the signal received by the receiver at different angles when the signal-to-noise ratio is 12dB and the QPSK signal is transmitted according to the present invention;
fig. 10 is a diagram of a time-modulated array antenna system according to the present invention.
The antenna unit is 1, the radio frequency power amplifier is 2, the phase shifter is 3, the probability-based time modulator is 4, the 1-minute M power divider is 5, the baseband signal generator is 6, the mixer is 7, the local vibration source is 8, and the controller is 9.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
As shown in fig. 10, a corresponding time modulation array antenna system includes N antenna units 1, N radio frequency power amplifiers 2, N phase shifters 3, 1 probability-based time modulator 4, 1 divide-by- 1M power divider 5, 1 baseband signal generator 6, 1 mixer 7, 1 local oscillation source 8, and a controller 9, where N and M are positive integers, and M is less than or equal to N;
the probability-based time modulator 4 is provided with M input ports and N output ports, and the nth output port is connected with the phase shifter 3, the radio frequency power amplifier 2 and the antenna unit 1 in sequence; the mth input port of the probability-based time modulator 4 is connected with the mth output port of the 1-division-M power divider 5; a baseband signal generator 6 generates a baseband signal carrying information and a radio frequency signal generated by a local vibration source 8, the baseband signal and the radio frequency signal are up-converted to a radio frequency domain through a frequency mixer 7, and an output port of the frequency mixer 7 is connected with an input port of a 1-division M power divider 5; the states of the N output ports of the probability-based time modulator 4 are controlled by the controller 9;
the nth antenna unit 1 is represented by p n Is in a radiating state, by 1-p n Is in a silent state, where 0 ≦ p n ≦ 1,n is an integer between 1 and N, and M is an integer between 1 and M.
Each antenna unit is controlled by a radio frequency switch to work; each antenna unit is in a radiation state with a certain probability, and is in a silent state at other times; the shape of the central frequency point radiation directional diagram can be controlled by controlling the conduction probability of each antenna unit; the time modulation of each antenna element is aperiodic such that the sideband radiation is approximately white gaussian noise with a flat radiated power spectrum, thereby suppressing the sideband radiation level to a maximum extent.
Specifically, the present embodiment provides a sideband radiation suppression method for a time modulation array, including the following steps:
s0, initializing an array structure, wherein the array structure comprises the design of an antenna unit 1, the selection of the number N of array elements, the layout of an antenna array, the minimum on-time length tau of a switch, and setting the maximum iteration number K to be more than or equal to 1000 and the current iteration number K =0;
s1, calculating excitation w of the nth antenna unit by using a computer according to a directional diagram expected to be radiated n N =1.. N, so as to obtain the probability p of conduction thereof n ＝|w n I, complex excitation w n The phase of (c) is realized by a phase shifter 3, |, modulo operator;
s2, randomly generating N distribution intervals [0,1 ] by using the controller 9 during the kth iteration]The nth element of the random number is denoted as r n If r is n ≤p n Then the nth antenna element 1 is in radiation mode, otherwise in silent mode, with iteration number k = k +1;
and S3, judging whether K is less than or equal to K, if so, repeating the step S2 to obtain the working states of the antenna units at other optional moments, and otherwise, ending the control of the time modulator 4 based on the probability.
In different radiation directions, the radiation signals are subjected to different time modulations, and the radiation signals have direction modulation characteristics.
The resulting sideband signal has a flat power spectrum as additive white gaussian noise.
Example 2
As shown in fig. 10, the present embodiment provides a time modulation array antenna system, which includes N antenna units 1, N rf power amplifiers 2, N phase shifters 3, 1 probability-based time modulator 4, 1 divide-by- 1M power divider 5, 1 baseband signal generator 6, 1 mixer 7, 1 local oscillation source 8, and a controller 9, where N and M are positive integers, and M is less than or equal to N;
the probability-based time modulator 4 is provided with M input ports and N output ports, and the nth output port is sequentially connected with the phase shifter 3, the radio frequency power amplifier 2 and the antenna unit 1; the mth input port of the probability-based time modulator 4 is connected with the mth output port of the 1-division-M power divider 5; a baseband signal generator 6 generates a baseband signal carrying information and a radio frequency signal generated by a local vibration source 8, the baseband signal and the radio frequency signal are up-converted to a radio frequency domain through a frequency mixer 7, and the output of the frequency mixer 7 is connected with an input port of a 1-division-M power divider 5; the states of the N output ports of the probability-based time modulator 4 are controlled by the controller 9;
the nth antenna unit 1 is represented by p n Is in a radiating state, by 1-p n Is in a silent state, where 0 ≦ p n 1,n is an integer from 1 to N and M is an integer from 1 to M.
Each antenna unit is controlled by a radio frequency switch to work; each antenna unit is in a radiation state with a certain probability, and is in a silent state at other time; the shape of the central frequency point radiation directional diagram can be controlled by controlling the size of the conduction probability; the time modulation of each antenna element is aperiodic such that the sideband radiation is approximately white gaussian noise with a flat radiated power spectrum, thereby suppressing the sideband radiation level to a maximum extent.
Example 3
To simplify the explanation, we consider here a linear array with N antenna elements, the elements being point element radiation. The nth antenna element has coordinate x n The probability of its operation in radial state is p n ，0≤p n 1,n is an integer between 1 and N, the probability of operating in a silent state is 1-p n . We used A n To indicate its operational state, the far field radiation pattern of this time modulation array can be represented as
Wherein beta is the wave number corresponding to the central frequency point, phi 0 To transmit a reference phase, θ, of a symbol 0 Is the wave number direction, theta is the angle between the array axis and phi n ＝βx n (cosθ-cosθ 0 )+φ 0 . Operating state A of the antenna n In accordance with Bernoulli distribution, i.e.
Namely, A n Probability of =1 is p n ，A n Probability of =0 is 1-p n 。
Thus, equation (1) can be viewed as a summation with N independent random distributions. According to the central limit theorem, when N is sufficiently large, the far-field radiation F (θ) can be approximated as a complex gaussian distribution. Its real part f 1 (theta) and imaginary part f 2 (theta) can be written as a two-dimensional real Gaussian vector f (theta), i.e.
By theoretical calculation, the complex mean value can be obtained as
Stacking the real imaginary part of the complex mean into a column vector as:
the row 1, column 1 elements of the covariance matrix are:
the diagonal elements are:
where μ (θ) is the mean vector of the far-field radiation F (θ), which has the physical meaning of a radiation pattern at the carrier frequency, which carries the correct baseband signal; Σ (θ) is a covariance matrix of the far-field radiation F (θ), whose physical meaning is the distribution and energy magnitude of the artificial noise.
Is the real part of x,
is the imaginary part of x, var [. Cndot]The sign is calculated for the variance and,
the sign is calculated for the mean.
In the above, we analyzed the statistical properties of the far-field radiation pattern of the present invention. It can be seen that we can control the radiation pattern μ (θ) of the central frequency point by reasonably adjusting the activation probability h of each antenna unit.
The following summarizes the main implementation steps of this embodiment (as shown in fig. 1):
s0, initializing an array structure, wherein the array structure comprises the design of an antenna unit 1, the selection of the number N of array elements, the layout of an antenna array, the minimum on-time length tau of a switch, and setting the maximum iteration number K to be more than or equal to 1000 and the current iteration number K =0;
s1, calculating excitation w of the nth antenna unit by using a computer according to a directional diagram expected to be radiated n So as to obtain the probability p of conduction n ＝|w n I, complex excitation w n The phase of (c) is realized by a phase shifter 3, |, modulo operator;
s2, randomly generating N distribution intervals [0,1 ] by using the controller 9 during the kth iteration]The nth element of the random number is denoted as r n If r is n ≤p n Then the nth antenna element 1 is in radiation mode, otherwise in silent mode, with iteration number k = k +1;
and S3, judging whether K is less than or equal to K, if so, repeating the step S2, and otherwise, finishing the control of the time modulator 4 based on the probability.
Example 4:
this embodiment provides a uniform time modulation array based on a half-wavelength arrangement of N =30 elements, i.e. the position of the nth antenna element is
Symmetric about the geometric center of the array, the antenna elements are ideal point sources.
This example mainly aims at illustrating the suppression effect of the temporal modulation array sideband radiation and the statistical properties of the sideband radiation based on the present invention. To simplify the process, we set the operating state of all antenna elements to be once per tau =1 microsecond, looping according to step S3 in fig. 1, yielding 1 × 10 in total 5 And (4) a pulse. In addition, we expect a center frequency radiation pattern to be a Chebyshev radiation pattern of-40 dB, with a desired radiation direction of 90.Fig. 2 shows the radiation pattern in the frequency-angle dimension of the time-modulated array, and it can be seen that the shape of the radiation pattern can be clearly seen at the center frequency point. It has a relatively flat radiated power spectrum for sideband radiation at its frequency, similar to conventional additive white gaussian noise. Figure 3 shows the variation of the average power radiation intensity with angle. It can be seen that in the desired radiation direction, the radiation power is at a peak, while for other side lobe regions, the radiation distribution is relatively uniform, nearly constant, with a side lobe level of-18.2 dB. Figure 4 shows the radiation pattern at the center frequency point and the sideband radiation peak pattern. It can be seen that sideband radiation is also suppressed to the greatest extent possible while achieving the desired radiation.
To verify the statistical properties of the far-field radiation, other transmitted symbols can be obtained by rotation, assuming the transmitted symbol is fixed at + 1. Fig. 5 shows the first-order statistical properties of the far-field radiation, i.e. the imaginary and real parts of the mean value of the far-field radiation. Since this embodiment employs a symmetric array layout, the imaginary part is always 0. Fig. 6 is a second-order statistical characteristic of far-field radiation, i.e., four element values of the far-field radiation covariance matrix. Fig. 7 is a constellation diagram of the radiation field at 8 degrees and its corresponding gaussian fit (upper right is a gaussian fit for the in-phase component and lower right is a gaussian fit for the quadrature component), fig. 8 is a constellation diagram of the radiation field at 65 degrees and its corresponding gaussian fit (upper right is a gaussian fit for the in-phase component and lower right is a gaussian fit for the quadrature component); it can be clearly seen that the radiation field in the side lobe region is very close to gaussian. Fig. 9 is the symbol error rate of the signal received by the receiver at different angles when the QPSK signal is transmitted with a signal-to-noise ratio of 12 dB; it can be seen that the symbol error rate can be controlled within a certain range in the desired radiation direction, whereas in the side lobe region, the symbol error rate is always maintained at a higher level. This illustrates that the present invention can be used to implement physical layer secure communications.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. A method of sideband radiation suppression for a time modulated array, characterized by:
the corresponding time modulation array antenna system comprises N antenna units (1), N radio frequency power amplifiers (2), N phase shifters (3), 1 probability-based time modulator (4), 1 divide-by-1M power divider (5), 1 baseband signal generator (6), 1 mixer (7), 1 local vibration source (8) and a controller (9), wherein N and M are positive integers, and M is less than or equal to N;
the probability-based time modulator (4) is provided with M input ports and N output ports, and the nth output port is sequentially connected with the phase shifter (3), the radio frequency power amplifier (2) and the antenna unit (1); the mth input port of the probability-based time modulator (4) is connected with the mth output port of the 1-division-M power divider (5); a baseband signal generator (6) generates a baseband signal carrying information and a radio frequency signal generated by a local vibration source (8) is up-converted to a radio frequency domain through a frequency mixer (7), and an output port of the frequency mixer (7) is connected with an input port of a 1-division M power divider (5); the states of N output ports of the probability-based time modulator (4) are controlled by a controller (9);
the nth antenna unit (1) is represented by p n Is in a radiating state, by 1-p n Is in a silent state, where 0 ≦ p n 1,n is an integer from 1 to N and M is an integer from 1 to M.
2. A method of sideband radiation suppression for a time modulated array according to claim 1, characterized by:
each antenna unit is controlled by a radio frequency switch to work; the shape of the central frequency point radiation directional diagram can be controlled by controlling the conduction probability of each antenna unit; the time modulation of each antenna element is aperiodic such that the sideband radiation is approximately white gaussian noise with a flat radiated power spectrum, thereby suppressing the sideband radiation level to a maximum extent.
3. A method of sideband radiation suppression for a time modulated array according to claim 1, comprising the steps of:
s0, initializing an array structure, wherein the array structure comprises the design of an antenna unit (1), the selection of the number N of array elements, the layout of an antenna array, the minimum on-time length tau of a switch, and setting the maximum iteration number K to be more than or equal to 1000 and the current iteration number K =0;
s1, calculating excitation w of the nth antenna unit by using a computer according to a directional diagram expected to be radiated n N =1,.. N, thus yielding the probability p of its turn-on n ＝|w n I, complex excitation w n The phase of (c) is realized by a phase shifter (3), and | get the modulus operator;
s2, randomly generating N distribution intervals [0,1 ] by using a controller (9) during the kth iteration]The nth element of the random number is recorded as r n If r is n ≤p n Then the nth antenna element (1) is in radiation mode, otherwise in silent mode, with iteration number k = k +1;
and S3, judging whether K is less than or equal to K, if so, repeating the step S2, and obtaining the working states of the antenna units at other optional moments, otherwise, ending the control of the time modulator (4) based on the probability.
4. A method of sideband radiation suppression for time modulated arrays according to any one of claims 1 to 3, characterized by: in different radiation directions, the radiation signals are subjected to different time modulations, and the radiation signals have direction modulation characteristics.
5. A method of sideband radiation suppression for time modulated arrays according to any one of claims 1 to 3, characterized by: the resulting sideband signal has a flat power spectrum as additive white gaussian noise.
6. A time-modulated array antenna system, characterized by: the radio frequency power amplifier comprises N antenna units (1), N radio frequency power amplifiers (2), N phase shifters (3), 1 probability-based time modulator (4), 1-division M power divider (5), 1 baseband signal generator (6), 1 mixer (7), 1 local oscillation source (8) and a controller (9), wherein N and M are positive integers, and M is less than or equal to N;
the probability-based time modulator (4) is provided with M input ports and N output ports, and the nth output port is sequentially connected with the phase shifter (3), the radio frequency power amplifier (2) and the antenna unit (1); the mth input port of the probability-based time modulator (4) is connected with the mth output port of the 1-division-M power divider (5); a baseband signal generator (6) generates a baseband signal carrying information and a radio frequency signal generated by a local vibration source (8) and is up-converted to a radio frequency domain through a frequency mixer (7), and the output of the frequency mixer (7) is connected with the input port of a 1-division M power divider (5); the states of N output ports of the probability-based time modulator (4) are controlled by a controller (9);
the nth antenna element (1) is represented by p n Is in the radiating state, at 1-p n In a silent state, where 0 ≦ p n ≦ 1,n is an integer between 1 and N, and M is an integer between 1 and M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211021455.2A CN115695129B (en) | 2022-08-24 | 2022-08-24 | Sideband radiation suppression method for time modulation array and antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211021455.2A CN115695129B (en) | 2022-08-24 | 2022-08-24 | Sideband radiation suppression method for time modulation array and antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115695129A true CN115695129A (en) | 2023-02-03 |
| CN115695129B CN115695129B (en) | 2024-03-26 |
Family
ID=85061504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211021455.2A Active CN115695129B (en) | 2022-08-24 | 2022-08-24 | Sideband radiation suppression method for time modulation array and antenna system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115695129B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0753840A2 (en) * | 1995-07-12 | 1997-01-15 | Konica Corporation | Driving circuit for a light-emitting element array |
| EP2744042A1 (en) * | 2012-12-11 | 2014-06-18 | BAE Systems PLC | Time modulated antenna array with optical switches |
| WO2014091221A1 (en) * | 2012-12-11 | 2014-06-19 | Bae Systems Plc | Time modulated antenna array with optical switches |
| CN104466430A (en) * | 2014-10-31 | 2015-03-25 | 西安电子科技大学 | Beam forming method based on time modulation array |
| CN106602282A (en) * | 2016-12-22 | 2017-04-26 | 厦门大学 | Mutual-coupling-contained time modulation array synthesis method based on difference evolution algorithm |
| CN106961019A (en) * | 2016-10-18 | 2017-07-18 | 电子科技大学 | A kind of four-dimensional antenna array sideband suppressing method based on many time-modulation frequencies |
| CN110221242A (en) * | 2019-05-20 | 2019-09-10 | 北京航空航天大学 | A kind of unmanned plane method for detecting based on time-modulation array |
| CN110890908A (en) * | 2019-12-06 | 2020-03-17 | 电子科技大学 | Pre-modulation secret communication system and method based on four-dimensional antenna array |
| CN111370873A (en) * | 2020-03-13 | 2020-07-03 | 电子科技大学 | High-efficiency phase modulation system based on time modulation array |
| CN112713921A (en) * | 2020-12-17 | 2021-04-27 | 电子科技大学 | Four-dimensional antenna array broadband communication beam forming system and method based on premodulation |
| CN112787698A (en) * | 2020-12-30 | 2021-05-11 | 电子科技大学 | Efficient time modulation array harmonic wave beam forming system and implementation method thereof |
| CN113556205A (en) * | 2021-07-19 | 2021-10-26 | 电子科技大学 | Physical layer secret communication system based on single sideband time modulation array |
| CN113655447A (en) * | 2021-08-20 | 2021-11-16 | 哈尔滨工业大学 | Time modulation array sideband suppression beam control method for radar communication integration |
| CN114124184A (en) * | 2021-11-17 | 2022-03-01 | 电子科技大学 | Array antenna beam forming system based on non-periodic time modulation |
| CN114465649A (en) * | 2022-01-21 | 2022-05-10 | 上海卫星工程研究所 | Time modulation array system and modulation method |
-
2022
- 2022-08-24 CN CN202211021455.2A patent/CN115695129B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0753840A2 (en) * | 1995-07-12 | 1997-01-15 | Konica Corporation | Driving circuit for a light-emitting element array |
| EP2744042A1 (en) * | 2012-12-11 | 2014-06-18 | BAE Systems PLC | Time modulated antenna array with optical switches |
| WO2014091221A1 (en) * | 2012-12-11 | 2014-06-19 | Bae Systems Plc | Time modulated antenna array with optical switches |
| CN104466430A (en) * | 2014-10-31 | 2015-03-25 | 西安电子科技大学 | Beam forming method based on time modulation array |
| CN106961019A (en) * | 2016-10-18 | 2017-07-18 | 电子科技大学 | A kind of four-dimensional antenna array sideband suppressing method based on many time-modulation frequencies |
| CN106602282A (en) * | 2016-12-22 | 2017-04-26 | 厦门大学 | Mutual-coupling-contained time modulation array synthesis method based on difference evolution algorithm |
| CN110221242A (en) * | 2019-05-20 | 2019-09-10 | 北京航空航天大学 | A kind of unmanned plane method for detecting based on time-modulation array |
| CN110890908A (en) * | 2019-12-06 | 2020-03-17 | 电子科技大学 | Pre-modulation secret communication system and method based on four-dimensional antenna array |
| CN111370873A (en) * | 2020-03-13 | 2020-07-03 | 电子科技大学 | High-efficiency phase modulation system based on time modulation array |
| CN112713921A (en) * | 2020-12-17 | 2021-04-27 | 电子科技大学 | Four-dimensional antenna array broadband communication beam forming system and method based on premodulation |
| CN112787698A (en) * | 2020-12-30 | 2021-05-11 | 电子科技大学 | Efficient time modulation array harmonic wave beam forming system and implementation method thereof |
| CN113556205A (en) * | 2021-07-19 | 2021-10-26 | 电子科技大学 | Physical layer secret communication system based on single sideband time modulation array |
| CN113655447A (en) * | 2021-08-20 | 2021-11-16 | 哈尔滨工业大学 | Time modulation array sideband suppression beam control method for radar communication integration |
| CN114124184A (en) * | 2021-11-17 | 2022-03-01 | 电子科技大学 | Array antenna beam forming system based on non-periodic time modulation |
| CN114465649A (en) * | 2022-01-21 | 2022-05-10 | 上海卫星工程研究所 | Time modulation array system and modulation method |
Non-Patent Citations (5)
| Title |
|---|
| JIXIN GUO: ""Efficient Sideband Suppression in 4-D Antenna Arrays Through Multiple Time Modulation Frequencies"", 《 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》, 25 September 2017 (2017-09-25) * |
| QIANWEI ZENG: ""A Time Modulated Antenna Array with Phase Modulation Waveforms"", 《2021 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY (ACES-CHINA) SYMPOSIUM》, 8 November 2021 (2021-11-08) * |
| 单成兆: ""面向雷达通信一体化的时间调制阵列波束赋形技术研究"", 《中国优秀硕士学位论文全文数据库 信息科技辑》, 15 February 2022 (2022-02-15) * |
| 曹岸杰;贺冲;梁仙灵;耿军平;金荣洪;: "一种用于双通道跳频技术的时间调制阵列系统", 电波科学学报, no. 06, 15 December 2014 (2014-12-15) * |
| 杨仕文: ""四维天线阵的频域全波分析"", 《电波科学学报》, 15 April 2008 (2008-04-15) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115695129B (en) | 2024-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Rocca et al. | 4-D arrays as enabling technology for cognitive radio systems | |
| CN112910807A (en) | Intelligent super-surface channel estimation method and system based on space random sampling | |
| Guo et al. | Time-modulated arrays for physical layer secure communications: Optimization-based synthesis and experimental assessment | |
| CN110493777B (en) | Multi-target secret communication system based on four-dimensional antenna array | |
| CN112034444B (en) | Multi-beam radar communication integration method based on cyclic coding array | |
| Chen et al. | Hybrid mechanical and electronic beam steering for maximizing OAM channel capacity | |
| Wang et al. | Beamforming of frequency diverse array radar with nonlinear frequency offset based on logistic map | |
| EP1924041B1 (en) | Multi-value modulation/demodulation method and multi-value modulation/demodulation device | |
| Kenane et al. | A dynamic invasive weeds optimization applied to null control of linear antenna arrays with constrained DRR | |
| Yu et al. | UCA based OAM beam steering with high mode isolation | |
| CN115695129B (en) | Sideband radiation suppression method for time modulation array and antenna system | |
| He et al. | Directional modulation for QAM signals with PAPR reduction | |
| Huang et al. | Security-Enhanced Directional Modulation Symbol Synthesis using High Efficiency Time-Modulated Arrays | |
| Purushothama et al. | Synthesis of energy efficiency-enhanced directional modulation transmitters | |
| CN109379119B (en) | Transmission method for carrying out SWIPT by utilizing vertical dimension for 3D large-scale MIMO system | |
| CN107231179A (en) | Modulate object function in a kind of radio communication direction | |
| CN113381834B (en) | Directional modulation method and system based on spread weighted fractional Fourier transform | |
| Mezghani et al. | MIMO beampattern and waveform design with low resolution DACs | |
| Gassab et al. | Novel Mathematical Formulation of the Antenna Array Factor for Side Lobe Level Reduction. | |
| Agha et al. | Optimization of antenna array pattern for uniformly excited rectangular array via thinning | |
| Tong | Time modulated linear arrays | |
| Wang et al. | Convergence of OAM beams using time-modulated concentric circular arrays | |
| Hburi et al. | Sub-array hybrid beamforming for sustainable largescale mmWave-MIMO communications | |
| Chen et al. | Efficient secure communication in 4-D antenna arrays through joint space–time modulation | |
| Wang et al. | Base Station Beamforming Design in Near-field XL-IRS Beam Training |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |