CN101609931B - Antenna array phase control technology based on time modulation and system realizing method thereof - Google Patents

Antenna array phase control technology based on time modulation and system realizing method thereof Download PDF

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CN101609931B
CN101609931B CN 200810044752 CN200810044752A CN101609931B CN 101609931 B CN101609931 B CN 101609931B CN 200810044752 CN200810044752 CN 200810044752 CN 200810044752 A CN200810044752 A CN 200810044752A CN 101609931 B CN101609931 B CN 101609931B
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frequency
sideband
signal
antenna array
phase control
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CN101609931A (en
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李钢
杨仕文
陈益凯
聂在平
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Abstract

The invention discloses antenna array phase control technology based on time modulation and a system realizing method thereof. By adopting the technology, an antenna array can realize spatial electric scanning of beams without using a phase shifter. The basic proposal of the invention comprises the antenna array, a complex programmable logic device, a high-speed radio-frequency switch, a receiver, and the like. Based on the proposal, by reasonably designing the working time sequence of each antenna unit, the technology and the method can realize the electric scanning of the antenna array beams in the space under the condition that the phase shifter is not needed to move the phase for each antenna unit and realize a directional diagram according with the requirement of side lobe level. By reasonably adding a frequency mixer, a filter, an amplifier and the like into the receiver, three beams and double-beam synchronous electric scanning can be conveniently realized. Because the phase shifter is not adopted, the volume of the system can be further reduced, and the complexity of the system can be reduced. Because the electric scanning of the antenna array beams can be conveniently realized, the technology and the method can be widely applied to radar and wireless communication systems.

Description

Antenna array phase control technology and system thereof based on the time modulation realize
Technical field
The invention belongs to the antenna works technical field, it is particularly related to the phase excitation that utilizes time modulation system control antenna array, realizes that the technical method of antenna array beam electric scanning and system thereof realize.
Background technology
In today of space and the continuous development of missilery, also increasingly high to the requirement of modern radar and wireless communication technology, this just makes phased array antenna become the focus that many orders are watched attentively.Phased array antenna has the ability of multiple special function (as simultaneously to sky search, identification and tracking etc.) and high-power, High Data Rate and opposing hostile environment condition, and it has promoted the research and the application of phased array radar and antenna greatly.
Phase array is lined up the antenna of array format exactly by many radiating elements, emittance between each unit and phase relation can be controlled.Typical phase array is that the PHASE DISTRIBUTION of utilizing the computer control phase shifter to change on the antenna aperature realizes wave beam at spacescan, i.e. electronic scanning is called for short electricity and sweeps.
Phase array can be divided into two big types, and promptly full electricity is swept phase array and swept phase array with rationing the power supply.Full electricity is swept phase array and can be claimed fixed phase array again, is promptly all adopting electricity to sweep on the orientation He on the elevation angle, and antenna array is fixed.Having rations the power supply sweeps the antenna that phase array is a kind of Mixed Design, promptly combines two or more antenna technologies, to obtain needed effect.Can be divided into mutually according to the scanning situation sweep, sweep frequently, phase/sweep mutually, phase/frequency are swept, machine/sweep mutually, machine/frequency are swept, limitedly multiple system such as sweep.Sweep series mutually and be meant that utilizing phase shifter to change phase relation realizes that the wave beam electricity sweeps.Frequently sweep and be meant and utilize the method that changes operating frequency to realize that the wave beam electricity sweeps.Phase/sweep mutually is to utilize two angular coordinates of phase shifter control plane battle array to realize that the wave beam electricity sweeps.It is to utilize coordinate of phase shifter control plane battle array and another coordinate utilizes frequency change to control realizes that the wave beam electricity sweeps that phase/frequency is swept.Machine/sweep mutually is to sweep at employing machine on the orientation, adopt on the elevation angle and sweep mutually.It is to sweep at employing machine on the orientation, adopt on the elevation angle and frequently sweep that machine/frequency is swept.
In recent years, the research of new antenna has also promoted the continuous development of novel phased array system.Time modulation technique aerial array comprehensively low/embodied great advantage aspect the ultralow secondary lobe directional diagram.Be different from conventional aerial array, because the reception signal of Time Modulated Antenna array has its unique character, this makes time modulation technique realize having obtained application aspect the antenna array beam electric scanning.
Summary of the invention
The present invention realizes that in view of above-mentioned technical background purpose is to provide a kind of antenna array phase control technology and system's implementation method thereof based on the time modulation.Its novelty is to reach through the operating time sequence of each radiation array element of control antenna array (being the initial work moment and run duration) purpose of wave beam electric scanning, can comprehensively satisfy the antenna pattern of minor level requirement simultaneously.Owing to only use the high-speed radio-frequency switch just can realize wave beam electric scanning control and Pattern Synthesis simultaneously; Therefore the feed system of aerial array is oversimplified more (not needing phase shifter and attenuator); Feed control is more prone to easy; Array pattern comprehensively convenient also helps the miniaturization of phased array system simultaneously.
For convenience, used term is done as giving a definition at present:
Bay: refer to be used for forming the unit of aerial array, be used to transmit and receive electromagnetic wave signal.
Circulator: refer to be used for transmitter and receiver are carried out the device that power is isolated.
Low noise amplifier: refer to the power amplifier device that noise factor is very low.
Transmit-receive switch: refer to be used for transceiver channel is changed and isolated.
CPLD (CPLD): refer to be used to produce binary control signal, i.e. " 0 " and " 1 " is used for controlling " the leading to " of high-speed radio-frequency switch and the Digital Logical Circuits of " breaking ".
High-speed radio-frequency switch: refer to the single-pole single-throw(SPST radio frequency absorption property switch that carries out work according to the control signal that CPLD produces.
Power splitter: the device that refers to one tunnel radiofrequency signal is divided into the output of several roads.
Variable attenuator: the device that refers to adjustable antenna array element feed amplitude fading amount.
Automatic gain controller: the device that makes the automatic control of adjusting with signal intensity of amplifying circuit Gain Automaticly.
Analog to digital converter: referring to be used for analog-signal transitions is the device of digital signal.
The invention provides a kind of antenna array phase control technology and system's implementation method thereof based on the time modulation.It comprises following basic scheme and improvement project.
Basic scheme:
This programme is to realize that based on the antenna array phase control technology of time modulation and system thereof it comprises the aerial array of being made up of duplexer array element 1.As shown in Figure 1, wherein each bay 1 all is connected to circulator 2 and transmit-receive switch 4.When transmit-receive switch 4 is in accepting state, amplify by low noise amplifier 3 through circulator 2 backs by the radiofrequency signal that bay 1 receives.Each bay 1 also is connected to high-speed radio-frequency switch 5 and high-speed radio-frequency switch 5 carries out periodic modulation to the radiofrequency signal that each bay 1 receives.The operating state of high-speed radio-frequency switch 5 receives CPLD (CPLD) 6 controls.6 of CPLDs can produce " leading to " and " breaking " that binary control signal " 0 " and " 1 " is controlled the high-speed radio-frequency switch through the program that writes in advance.
Based on this basic scheme, then 7 of the receivers among Fig. 1 should comprise that frequency is f 0+ f p-f IStable local oscillator 8, frequency mixer 9, (its passband should be positioned at f to band pass filter 10 I), automatic gain controller (AGC) 11, intermediate frequency amplifier 12, low pass filter 13, analog to digital converter 14 and digital signal processor 15 etc.Being received and got into behind the receiver at first the frequency that produces with stable local oscillator 8 by the on-off modulated radiofrequency signal of high-speed radio-frequency by aerial array is f 0+ f p-f ILocal oscillation signal carry out Frequency mixing processing through frequency mixer 9, (frequency is f to positive first sideband signals that is used for time modulation back is produced 0+ f p) to obtain frequency be f to down-conversion IIntermediate-freuqncy signal; Carry out power amplification with sending into intermediate frequency amplifier 12 behind band pass filter 10 filtering center frequency signal and other sideband signals except that positive first sideband; The gain amplifier of intermediate frequency amplifier 12 is controlled by automatic gain controller 11; Amplified IF signal becomes I/Q two-way quadrature zero intermediate frequency signals after the orthogonal local oscillation mixing, become through low pass filter 13 and analog to digital converter 14 then to get into digital signal processor 15 after the digital signal and carry out digital signal corresponding and handle.
Described improvement project has following five kinds:
First kind of improvement project: it is that frequency is f through interpolation power splitter 16 in receiver 7 0-f p-f IStable local oscillator 17, frequency be f 0-f IStable local oscillator 18, band pass filter 10, intermediate frequency amplifier 12, automatic gain controller 11, orthogonal local oscillation, low pass filter 13 and analog to digital converter 14, the negative first sideband processing module 19; Centre frequency processing module 20 and the positive first sideband processing module 21, as shown in Figure 3.But utilize centre frequency and the positive and negative first sideband implementation space three wave beams to work the radiation beam implementation space electric scanning of wherein positive and negative first sideband simultaneously.
Second kind of improvement project: it is through adaptive algorithm is applied in the digital signal processor; And the output control signal of utilizing digital signal processor is controlled the operating state of high-speed radio-frequency switch; Reach the purpose of auto-adaptive time weighting, form in order to realize adaptive beam, as shown in Figure 4.
The third improvement project: it is through utilizing optimized Algorithm (for example genetic algorithm GA, differential evolution algorithm DES etc.) to optimize the work schedule of each bay, improving the radiance of directional diagram.
The 4th kind of improvement project: it is through each bay being added variable attenuator, amplitude weighting being combined with time weight, through the control of many one dimensions, realizes the comprehensive of antenna array pattern more flexibly and easily.
The 5th kind of improvement project: but it is through the antenna in the basic scheme being installed on the antenna pedestal of mechanical rotation, and the electric scanning of aerial array is combined with mechanical scanning.
Utilize the time modulation to realize the method for beam space electric scanning:
When a frequency is f 0The plane electromagnetic wave irradiation line array with N bay as shown in Figure 1 and the operating frequency of high-speed radio-frequency switch be f pThe time, the expression formula of its array factor does
F ( θ , t ) = e j 2 π f 0 t Σ k = 1 N A k U k ( t ) · e - j ( k - 1 ) β d sin θ
A wherein kBe the feed amplitude of k bay, U k(t) operating state of k RF switch of expression, when the high-speed radio-frequency switch that links to each other with k bay is in running order, U k(t)=1, otherwise when being in off-state, U k(t)=0.β is the wave number in the free space, and d is the spacing between the adjacent antenna array element.Because (θ t) is the periodic function of time t to F, therefore can following formula be expanded into the form of fourier series, promptly
F ( θ , t ) = Σ n = - ∞ ∞ Σ k = 1 N a nk · e j 2 π ( f 0 + n f 0 ) t e j ( k - 1 ) β d sin θ
Wherein
a nk = f p ∫ t 0 k t 0 k + τ k A k e - j 2 πn f p t dt
= A k f p τ k sin nπ f p τ k nπ f p τ k e - jnπ f p ( 2 t 0 k + τ k )
Work as n=0,1 with-1 o'clock with obtaining centre frequency respectively, the antenna pattern of positive first sideband and negative first sideband, promptly
F 0 ( θ , t ) = e j 2 π f 0 t Σ k = 1 N A k f p τ k e j ( k - 1 ) β d sin θ
F 1 ( θ , t ) = e j 2 π ( f 0 + f p ) t Σ k = 1 N A k π sin ( π f p τ k ) e - jπ f p ( 2 t 0 k + τ k ) · e j ( k - 1 ) β d sin θ
F - 1 ( θ , t ) = e j 2 π ( f 0 - f p ) t Σ k = 1 N A k π sin ( - π f p τ k ) e - jπ f p ( 2 t 0 k + τ k ) · e j ( k - 1 ) β d sin θ
T wherein 0kAnd τ kBe that k bay is at the work period of high-speed radio-frequency switch 1/f pThe interior initial duration of connecting constantly and being in on-state.Can find out, at positive and negative first sideband, through appropriate design τ kThen can comprehensively go out to satisfy the directional diagram of minor level requirement, through t rationally is set 0kSensing that then can control antenna battle array main beam.From top formula, also can find out in addition, if will make normalization feed amplitude between [0,1], change, f then pτ kSpan should be [0,0.5], if will make the phase change of feed between [π, π], change, f then pt 0kSpan should be [0.5,0.5], and on centre frequency, the beam position of directional diagram then with initial work t constantly 0kIrrelevant.
Antenna array phase control technology and system thereof based on the time modulation provided by the invention; Can be implemented under the situation that does not need phase shifter; Through controlling the initial work moment and the continuous working period of each bay, realize the space electric scanning of antenna array beam at first sideband.Make this system only need a high-speed radio-frequency switch can realize wave beam electric scanning control and Pattern Synthesis simultaneously.Design is satisfied the directional diagram of minor level requirement and realized that the wave beam electric scanning can reach the purpose of killing two birds with one stone.Compare with conventional phased array antenna,, make system complexity reduce greatly owing to need not use phase shifter and attenuator.Realize on positive and negative first sideband owing to the wave beam electric scanning simultaneously; Therefore; The wave beam at centre frequency place can be as purposes such as communicate by letter with fixed target; Need not add under the situation of any device at system front end only adding relevant digital signal processing module, work when getting final product three wave beams in implementation space is shown in following improvement project.
In described basic scheme, as depicted in figs. 1 and 2, the electric scanning of antenna array beam realizes at positive first sideband.The initial work moment and continuous working period through each pre-designed bay are carried out programmed process to CPLD 6, download to the CPLD chip by cable.Each bay 1 links to each other with transmit-receive switch 4 with circulator 2.Circulator 2 and transmit-receive switch 4 play the purpose of channel separation, stop the high-power RF signal of transmitter to get into receiver.Get into receiver 7 after the periodic modulation of radiofrequency signal by the aerial array reception through the high-speed radio-frequency switch 5 on each road.As shown in Figure 2, in receiver 7, radiofrequency signal (comprising centre frequency and all sideband signals) is f with frequency at first 0+ f p-f ILocal oscillation signal carry out Frequency mixing processing, with the positive first sideband (f 0+ f p) signal downconverts to intermediate frequency f I, filter center frequency signal and other sideband signals except that positive first sideband by band pass filter 10 then.Also need align first sideband signals and carry out intermediate frequency amplification through after the band pass filter 10 this moment, and its gain amplifier receives automatic gain controller 11 controls.Become two-way I/Q quadrature zero intermediate frequency signals through orthogonal local oscillation, after analog to digital converter 14 becomes digital signal, can get into digital signal processor 15 and carry out the digital signal corresponding processing.Receiver system given here is the zero intermediate frequency digital receiver, in practical application, can change this receiver system based on practical use and needing etc.
This basic scheme can be implemented in the wave beam electric scanning under the situation that does not need phase shifter.And utilize time weight can realize satisfying the directional diagram and the beam position control of minor level requirement simultaneously.
This basic scheme is the most basic scheme form that we provide, do on this basis some improve just constituted following based on the antenna array phase control technology of time modulation and the improvement project of system thereof:
First kind of improvement project, it is in receiver 7, to add power splitter 16, frequency is f 0-f p-f IStable local oscillator 17, frequency is f 0-f IStable local oscillator 18, band pass filter 7, intermediate frequency amplifier 12, automatic gain controller 11, low pass filter 13 and analog to digital converter 14, the negative first sideband processing module 19, centre frequency processing module 20 and the positive first sideband processing module 21, as shown in Figure 3.Utilize centre frequency and positive and negative first sideband to work the radiation beam implementation space electric scanning of wherein positive and negative first sideband simultaneously by implementation space three wave beams.The radiofrequency signal through the modulation of high-speed radio-frequency switch periods property that antenna end receives gets into the same frequency component is contained in receiver 7 backs by one minute three power splitter 16 outputs three tunnel signal.This three road signal all comprises centre frequency and each band components signal.In order to obtain the signal at centre frequency and the positive and negative first sideband place, three road signals should be f with frequency respectively 0-f p-f I, f 0-f IAnd f 0+ f p-f ILocal oscillation signal carry out Frequency mixing processing, negative first sideband signals, center frequency signal and positive first sideband signals downconvert to IF-FRE f respectively IEach road utilizes passband to be positioned at f then I Band pass filter 10 filtering unwanted frequency compositions, can obtain negative first sideband, centre frequency and positive first sideband signals respectively.After each road signal passes through intermediate frequency amplifier 12 respectively, do to convert digital signal into by analog to digital converter 14 after the I/Q binary channels is handled via orthogonal local oscillation, wherein the gain amplifier of intermediate frequency amplifier 12 receives the control of automatic gain controller 11.In digital signal processor, can divide three processing modules, the promptly negative first sideband processing module 19, centre frequency processing module 20 and the positive first sideband processing module 21.Each module is handled the digital signal on sideband separately or the centre frequency respectively alone.Utilize this improved receiver structure, can work simultaneously by implementation space three wave beams, the wave beam on wherein positive and negative first sideband can be realized electric scanning, and the wave beam on the centre frequency then immobilizes.This receiver mainly is divided into three passages, respectively center frequency signal and positive and negative first sideband signals is handled.Each passage can be regarded a zero intermediate frequency digital receiver as.Actual needs and requirement according to system can be changed its structure.
Second kind of improvement project; It is through adaptive algorithm is applied in the digital signal processor, and utilizes the operating state of the output control signal control high-speed radio-frequency switch of digital signal processor, reaches the purpose of auto-adaptive time weighting; In order to realize that adaptive beam forms, as shown in Figure 4.This receiving system mainly is divided into two parts, and the radiofrequency signal that first receives through antenna is carried out periodic modulation (being the time weighting) by the high-speed radio-frequency switch and got into receiver afterwards; Second portion then is traditional adaptive weight computing network.In this network; The signal that each bay receives passes through down-conversion respectively; The I/Q orthogonal double channels is handled, and gets into digital signal processor after the analog-to-digital conversion, utilizes quite ripe now adaptive algorithm to calculate the optimum weighted value of each bay.Produce control signal by this weighted value, the time weight value of control high-speed radio-frequency switch makes antenna array on first sideband, obtain optimal beam (like self adaptation zero setting etc.).
The third improvement project: it is to utilize optimized Algorithm (like genetic algorithm, differential evolution algorithm etc.) to optimize the operating time sequence of each bay, improves the antenna array pattern performance, like minor level, and sidebands levels etc.
The 4th kind of improvement project: it is through each bay being added variable attenuator, amplitude weighting being combined with time weight.Through adding variable attenuator, can utilize amplitude weighting and time weight simultaneously when making in this system synthesized pattern, be the control that many one dimensions comprehensively are provided of directional diagram.
The 5th kind of improvement project; But it is through the antenna in the basic scheme being installed on the antenna pedestal of mechanical rotation, and the electric scanning of aerial array is combined with mechanical scanning.This scheme can combine with first kind of improvement project, make the radiation beam of centre frequency under machinery control, realize scanning, and the sensing of the radiation beam of positive and negative first sideband is controlled jointly through time weight and mechanical rotation.
The third, the 4th kind and the 5th kind of improvement project all should comprise following two characteristics at least:
(1) described each bay 1 all is connected with a high-speed radio-frequency switch 5, and the operating state of high-speed radio-frequency switch is controlled by logical circuit, and is as shown in Figure 1.
(2) receiver should comprise the different local vibration source of one or several frequency, is used for the signal of centre frequency and positive and negative first sideband is downconverted to the intermediate-freuqncy signal of same frequency, as shown in Figures 2 and 3.
Therefore, above-mentioned basic scheme has each self-corresponding characteristic respectively with all improvement projects, and the space electric scanning of wave beam realizes on positive and negative first sideband, comes the spacescan angle of control antenna wave beam through the work schedule of controlling each bay.Because beam scanning realizes that on positive and negative first sideband main lobe position then remains unchanged on the centre frequency, therefore can the implementation space multi-beam handle.Because three wave beams are realized on different frequencies, therefore also realize transmitting and receiving of frequency diverse signals easily.Compare with traditional phased array antenna,, make the comprehensive of antenna pattern and wave beam control more flexibly with easy owing to having introduced the time degree of freedom.Therefore, this system is applicable to the wireless system that those need beam scanning.
The present invention has following beneficial effect:
(1) owing to can realize Pattern Synthesis and beam scanning control through time weight, therefore the use of having saved amplitude weighting device and phase shifting device can reduce system cost, reduces the volume of system.
(2) realize on positive and negative first sideband owing to beam scanning, make the directional diagram on the centre frequency can make other purposes, the processing of implementation space multi-beam.
(3), only just can realize on first sideband that with the high-speed radio-frequency switch adaptive beam forms through introducing adaptive algorithm.
(4) utilize the centre frequency and first sideband to transmit and receive signal, can improve the confidentiality and the interference free performance of system.
Description of drawings
Fig. 1 is the emission and the receiving front-end of the no phase shifter phased array system based on time modulation of the present invention.
Wherein, the 1st, bay, the 2nd, circulator, the 3rd, low noise amplifier, the 4th, transmit-receive switch, the 5th, high-speed radio-frequency switch, the 6th, CPLD, the 7th, receiver.
Fig. 2 is the positive first sideband signals zero intermediate frequency digital receiver system block diagram.
Wherein, the 8th, frequency is f 0+ f p-f IStable local oscillator, the 9th, frequency mixer, the 10th, passband is positioned at f IBand pass filter, the 11st, automatic gain controller, the 12nd, intermediate frequency amplifier, the 13rd, low pass filter, the 14th, analog to digital converter, the 15th, digital signal processor.
Fig. 3 is based on the centre frequency and the positive and negative first sideband signals receiver system block diagram of improvement project one.
Wherein, 16 is power splitters of one minute three, the 17th, and frequency is f 0-f p-f IStable local oscillator, the 18th, frequency is f 0-f IStable local oscillator, the 19th, the negative first sideband processing module, the 20th, centre frequency processing module, the 21st, the positive first sideband processing module.
Fig. 4 is based on the system block diagram of the realization adaptive beam formation of improvement project two
Fig. 5 is the initial operating time of normalization of each bay among embodiment 1 and the embodiment 2
Fig. 6 is the normalization continuous working period of each bay among embodiment 1 and the embodiment 2
Fig. 7 be embodiment 1 with embodiment 2 in directional diagram on centre frequency and positive and negative first sideband
Fig. 8 is the initial operating time of the normalization of each bay among the embodiment 3
Fig. 9 is the normalization continuous working period of each bay among the embodiment 3
Figure 10 is the directional diagram on centre frequency and first sideband among the embodiment 3
Embodiment
Embodiment 1: based on the positive first sideband wave beam scan control under the no phase shifter situation of time modulation
See figures.1.and.2, present embodiment adopts N=8 unit omni-directional antenna array element to constitute the linear antenna array, and array element distance is a half wavelength.Utilize the scan control of positive first sideband and time weight realization wave beam, so respective receiver is for receiving positive first sideband signals.Center frequency signal and other sideband signals are all by filtering.Adopt the distribute directional diagram of comprehensive-20dB minor level of discrete Taylor, main beam departs from aerial array normal direction 20 degree.Obtain the initial work moment of the normalization of each bay in modulation period time and normalized continuous working period thus, respectively like Fig. 5 and shown in Figure 6.The positive first sideband directional diagram that obtains is shown in the dotted line among Fig. 7.The result shows, the main lobe of this directional diagram points to 20 degree, and minor level is-20dB, meets design requirement, and compares with the radiant power of centre frequency, and the radiant power of positive first sideband has only reduced 2.1dB.Utilize receiver system as shown in Figure 2, positive first sideband signals is downconverted to IF-FRE f IBy band pass filter filtering centre frequency and other all unwanted sideband signals; After only keeping positive first sideband signals, become the two-way digital orthogonal baseband signal, convert into by analog to digital converter and get into digital signal processor after the digital signal and carry out digital signal corresponding and handle through orthogonal local oscillation.
Present embodiment is based on and utilizes time modulation technique in the antenna array beam scan control that realizes on positive first sideband under Pattern Synthesis and the no phase shifter situation under the basic scheme; And provided workflow, realized only utilizing the high-speed radio-frequency switch just can comprehensively satisfy directional diagram and the beam position control of minor level requirement simultaneously and received and processing with signal on positive first sideband based on receiver system under the positive first sideband beam scanning.
Embodiment 2: space three wave beams based on the time modulation form and the positive and negative first sideband wave beam scan control
With reference to Fig. 1 and Fig. 3, present embodiment adopts N=8 unit omni-directional antenna array element to constitute the linear antenna array equally, and array element distance is a half wavelength.Utilize positive and negative first sideband and time weight to realize the scan control of wave beam, the beam position at centre frequency place is constant.The respective receiver system is divided into three the tunnel and receives, and utilizes three different local vibration sources of local frequency respectively center frequency signal and positive and negative first sideband signals to be downconverted to IF-FRE f I, band pass filter filtering unwanted frequency composition is used on each road respectively, and then through orthogonal local oscillation, analog to digital converter etc. become digital signal, get into corresponding processing module respectively and carry out Digital Signal Processing.Present embodiment still adopts discrete Taylor to be distributed in the directional diagram of comprehensive-20dB minor level on first sideband, and main beam departs from aerial array normal direction 20 degree on positive first sideband, and the negative accordingly first sideband main beam departs from aerial array normal direction-20 degree.Obtain the initial work of the normalization of each bay in modulation period time identical constantly and among normalized continuous working period and the embodiment 1 thus, promptly like Fig. 5 and shown in Figure 6.Directional diagram on directional diagram on the centre frequency that obtains and positive and negative first sideband is as shown in Figure 7.Solid line among Fig. 7 is the directional diagram on the centre frequency, can find out its main beam pointing aerial array normal direction, i.e. θ=0 °, and its minor level is-18.3dB.Dotted line among Fig. 7 and dotted line are respectively positive first sideband and the negative first sideband directional diagram, can find out that its main beam points to θ=20 ° and θ=-20 ° respectively, and the minor level of directional diagram are-20dB separately.Simultaneously, the radiant power of positive and negative first sideband is compared the 2.1dB that only descended with centre frequency.Utilize receiver system as shown in Figure 3, signal and the frequency with centre frequency and positive and negative first sideband is respectively f respectively 0-f I, f 0+ f p-f IAnd f 0-f p-f ILocal oscillation signal carry out mixing; Utilize band pass filter to keep needed signal component; Down-convert to the I/Q two paths of signals through orthogonal local oscillation afterwards, utilize analog to digital converter to change it into digital signal, the processing module that gets into is at last separately carried out the digital signal corresponding processing.
What present embodiment was based on improvement project one utilizes time modulation technique in the antenna array beam scan control that realizes on positive and negative first sideband under Pattern Synthesis and the no phase shifter situation; And provided workflow based on the receiver system of improvement project one; Realized only utilizing the high-speed radio-frequency switch just can realize comprehensively satisfying on positive and negative first sideband beam scanning control of the directional diagram and the aerial array of minor level requirement; And on centre frequency, have the directional antenna Array Method to wave beam, realized utilizing centre frequency and positive and negative first sideband situation that three wave beams are worked simultaneously in the space.The receiver system that utilizes this scheme to provide can carry out shunt to the signal on centre frequency and positive and negative first sideband simultaneously and handle simultaneously.
Embodiment 3: the first sideband adaptive beam based on the time modulation forms
With reference to Fig. 4, the receiving system in the present embodiment mainly is divided into two parts, promptly optimum weights computing network and time weight network.Optimum weights computing network is to utilize quite ripe at present adaptive algorithm and Digital Signal Processing; The array data that aerial array is received carries out the calculating of optimum weights, and optimum weights are converted into the control signal of control high-speed radio-frequency switch working state.Time weight network similar embodiment 1 and embodiment 2 are promptly utilized the mode of time modulation to realize time weight, and are utilized the special nature of first sideband to become optimal beam from adaptation to the ground.Present embodiment still adopts N=8 unit omni-directional antenna array element to constitute the linear antenna array, and array element distance is a half wavelength.The respective receiver system can adopt structure as shown in Figure 2.The arrival bearing who makes desired signal is θ=20 °; The arrival bearing of interference signal is θ=-20 °; Signal to noise ratio is-30dB; Interference-to-noise ratio is 40dB, utilize maximum Signal to Interference plus Noise Ratio criterion compute optimal weights and be translated into the control signal of control high-speed radio-frequency switch, the initial work of the normalization of each bay that obtains thus constantly with the normalization run duration respectively like Fig. 8 and shown in Figure 9.The directional diagram that on positive first sideband, obtains can be found out directional diagram main beam pointing θ=20 ° shown in the solid line among Figure 10, ° produced profound zero point in θ=-20 simultaneously, thereby helped receiving expectation signal suppressing interference signal.As a comparison, provided the antenna pattern at the centre frequency place under this optimum weighting among Figure 10.Compare with this antenna pattern, therefore the radiant power of positive first sideband 2.3dB that only descended utilizes time modulation technique to realize that at first sideband adaptive beam forms easily.Utilize receiver system as shown in Figure 2, just can align the signal that first sideband received and carry out follow-up processing.
What present embodiment was based on improvement project two utilizes time modulation technique and adaptive algorithm and Digital Signal Processing, realizes that on positive first sideband adaptive beam forms.To existing simultaneously in the space under the situation of desired signal and interference source; Compute optimal weights adaptively; And, control the job initiation moment and the continuous working period of each bay with its logic control signal that changes control high-speed radio-frequency switch into, realize on first sideband that thus adaptive wave beam forms; Make main beam aim at the arrival bearing of desired signal, on the interference source direction, produce profound zero point simultaneously.Receiver system among this embodiment has adopted the receiver system in the basic scheme, as shown in Figure 2, and can be in the practical application based on this structures of change such as concrete application requirements.
More than, description of the invention is provided so that their easy to understand and utilization the present invention to those skilled in the art that.For those skilled in the art that, be conspicuous to the various changes of these embodiment, and need not performing creative labour.Therefore, the present invention is not only for fixing on scheme described here, but the scope consistent with described claim.

Claims (8)

1. the aerial array phase control system of modulating based on the time; It comprises the aerial array that the bay (1) of transmit-receive sharing is formed; Wherein each bay (1) all is connected to circulator (2), low noise amplifier (3), transmit-receive switch (4) and high-speed radio-frequency switch (5); Low noise amplifier (3) and high-speed radio-frequency switch (5) have then constituted the feeding network of this duplexer array; Described high-speed radio-frequency switch (5) is controlled by complex programmable logic device (CPLD) circuit (6); It is f that receiver (7) should comprise a local frequency 0+ f p-f IStable local vibration source (8); The local oscillation signal that radiofrequency signal that receives and local vibration source (8) produce carries out Frequency mixing processing through frequency mixer (9); The intermediate-freuqncy signal of output is delivered to band pass filter (10) back and is got into intermediate frequency amplifier (12), and the gain amplifier of intermediate frequency amplifier (12) is controlled by automatic gain controller (11); Amplified IF signal is mixed down I/Q two-way orthogonal signalling through orthogonal local oscillation, delivers to analog to digital converter (14) through low pass filter (13) and converts digital signal into, finally gets into digital signal processor (15) and carries out the correlated digital signals processing.
2. the aerial array phase control system of modulating based on the time; It comprises the aerial array that the bay (1) of transmit-receive sharing is formed; Wherein each bay (1) all is connected to circulator (2), low noise amplifier (3), transmit-receive switch (4) and high-speed radio-frequency switch (5); Low noise amplifier (3) and high-speed radio-frequency switch (5) have then constituted the feeding network of this duplexer array; Described high-speed radio-frequency switch (5) is controlled by complex programmable logic device (CPLD) circuit (6); Receiver (7) should comprise one fen power splitter (16) of three, and it is f that three road signals of output down-convert to frequency with three different local oscillation signals of frequency through frequency mixer (9) separately IThree tunnel intermediate-freuqncy signals, three tunnel intermediate-freuqncy signals are amplified by intermediate frequency amplifier (12) after band pass filter (10) Filtering Processing, the gain amplifier unification of intermediate frequency amplifier (12) receives the control of automatic gain controller (11); Amplified IF signal is mixed down I/Q two-way orthogonal signalling through orthogonal local oscillation; Deliver to analog to digital converter (14) through low pass filter (13) and convert digital signal into; Negative first sideband signals gets into the negative first sideband processing module (19) and handles; Center frequency signal gets into centre frequency processing module (20) and handles, and positive first sideband signals gets into the positive first sideband processing module (21) and handles.
3. the aerial array phase control system based on the time modulation according to claim 1 and 2 is characterized in that described bay (1) is connected to high-speed radio-frequency switch (5), and does not need other phase shifting devices.
4. the aerial array phase control system based on the time modulation according to claim 1 is characterized in that it comprises that a passband is positioned at f IBand pass filter.
5. the aerial array phase control system based on the time modulation according to claim 2 is characterized in that it comprises that a local frequency is f 0-f p-f IStable local oscillator (17).
6. the aerial array phase control system based on the time modulation according to claim 2 is characterized in that it comprises that a local frequency is f 0-f IStable local oscillator (18).
7. the aerial array phase control system based on the time modulation according to claim 1 and 2 is characterized in that it comprises a digital signal processor (15).
8. the aerial array phase control system based on time modulation according to claim 1 and 2, it is characterized in that initial work that it passes through control antenna array element (1) constantly and continuous working period realize beam scanning control and Pattern Synthesis.
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