CN101587188A - Monopulse radar system based on time modulation antenna array - Google Patents

Monopulse radar system based on time modulation antenna array Download PDF

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Publication number
CN101587188A
CN101587188A CNA2008100444261A CN200810044426A CN101587188A CN 101587188 A CN101587188 A CN 101587188A CN A2008100444261 A CNA2008100444261 A CN A2008100444261A CN 200810044426 A CN200810044426 A CN 200810044426A CN 101587188 A CN101587188 A CN 101587188A
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China
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frequency
radar system
system based
battle array
array
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CNA2008100444261A
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Chinese (zh)
Inventor
杨仕文
陈益凯
李钢
聂在平
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电子科技大学
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Priority to CNA2008100444261A priority Critical patent/CN101587188A/en
Publication of CN101587188A publication Critical patent/CN101587188A/en

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Abstract

The invention discloses a phased array monopulse radar system based on the time modulation antenna array technology. The basic scheme of the invention comprises an antenna array comprising a plurality of array antenna units, a high-speed radio frequency switch controlled by a complex programmable logic device, a radar receiver, and the like; based on the basic scheme, a power-divider, a mixer, and an intermediate frequency amplifier are reasonably added in the radar receiver, and an amplitude detector, a phase detector and the like are reasonably added at a data processing terminal to form various improved schemes of the invention. With the invention, sum beams and difference beams are easily generated simultaneously, therefore, the transmission of simultaneous frequency diversity signals can be easily realized, and difference beams of higher performance (beam gain, null depth, slope of zero, and the like) can be easily obtained. The invention can be widely used in the phased array monopulse radar systems having application background adding radar reconnaissance difficulty of enemy, or used in radar systems of other target angle measurement and precision angle tracking.

Description

A kind of monopulse radar system based on the Time Modulated Antenna battle array

Technical field

The invention belongs to the radar engineering technical field, it is particularly related to the phased array monopulse radar system based on the Time Modulated Antenna battle array.

Background technology

The notion of monopulse antenna is derived from interferometer, and theoretically, the monopulse angle-measuring method only needs an echo-pulse can obtain the whole angle error information of target, and it is very short therefore to obtain angle error information required time.Monopulse method angle measurement accuracy is very high, therefore is used in the precision tracking radar system more.Also there are not at present to surpass other trackers of single-pulse track precision.

The precision tracking system that adopts mainly is the single-pulse track system at present, and the angular tracking accuracy of U.S.'s missile-range-instrumentation radar is the highest Ground Tracking System of precision known today up to 0.1 mil.TDRSS Tracking and Data Relay Satellite System ATDRSS (the Advanced Tracking ﹠amp of U.S. a new generation; Data Relay Satellite System) KSA in (Ka-band Single Access) link also is to adopt the single-pulse track system, and tracking accuracy is the highest space tracking system (STS) of precision known today up to 1 mil.In present single-pulse track system, if adopt amplitude and difference monopulse angle measurement or employing phase place and the angle measurement of difference monopulse, angular error signal is all relatively determined with signal and a difference signal by one.From the angle error analytic angle, for a target echo signal, has only an error signal, in order to improve tracking range and measuring accuracy, or in order to provide Doppler to differentiate, angular error signal can only determine that this can increase the time of obtaining angular error signal undoubtedly jointly by a plurality of target echo signals.

On the other hand, promoted the research of new radar system in the research of antenna research field new antenna form.The introducing of time modulation technique aspect array antenna brought to realizing that Low Sidelobe and even ultralow secondary lobe bring great convenience.In the research of time modulation array antenna, the time series modulation system of various Different Strategies is that the application (be included in accurate angle tracking radar system) of Time Modulated Antenna battle array under various application backgrounds provides new research topic.

Summary of the invention

The present invention realizes in view of above-mentioned technical background, purpose is to provide a kind of monopulse radar system based on the Time Modulated Antenna battle array, its novelty is simultaneously and difference beam is being realized on the different frequency separately, can obtain two high frequency angular error signals when receiving a target echo, reception and difference beam performance are easy to control than the traditional antenna battle array, obtain angular error signal time weak point, the characteristics that the angular tracking accuracy that obtains is high in the identical time.

For convenience, we at first are defined as follows used term.

Circulator: refer to be used for device that transmitter and receiver are isolated.

Transmit-receive switch: when referring to be used for the circulator collaborative work, the effect of playing the transceiver channel conversion and isolating.When transmitter was sent the high-frequency high-power pulse here, it can close receiver inlet, allowed the high-frequency high-power pulse deliver to antenna, launched through antenna; When the receiving target echoed signal, it can cut off transmitter port, connects receiver inlet, makes echoed signal directly enter receiver.

CPLD (CPLD) circuit: refer to be in the present invention the DLC (digital logic circuit) of each antenna element rise time sequence.

High-speed radio-frequency switch: refer to single-pole single-throw (SPST) radio frequency absorption switch according to the time series work of CPLD generation.

Phase shifter: the device that refers to be used to regulate the antenna element current feed phase.

Variable amplitude attenuator: the device that refers to be used to regulate antenna element feed amplitude.

Antenna submatrix: refer to that as the relatively independent antenna element of the part of multi-antenna array it constitutes a sub-antenna system.

Put in the linearity: the device that refers to be used for intermediate-freuqncy signal is carried out linear amplification.

Phase detector: the device that refers to the high frequency angular error signal to be converted to direct-flow error voltage.

The invention provides a kind of monopulse radar system based on the Time Modulated Antenna battle array, it comprises following basic scheme and improvement project, and described basic scheme is as follows:

Basic scheme:

A kind of monopulse radar system based on the Time Modulated Antenna battle array, angle tracking system adopt amplitude and difference monopulse system.It comprises the antenna array of being made up of the antenna element 1 of transmit-receive sharing, and wherein each antenna element 1 all is connected to circulator 2 and transmit-receive switch 4.Antenna element spacing and static stimulation amplitude are determined as design parameters and the performance of difference beam.Described each antenna element 1 also is connected to low noise amplifier 3, phase shifter 5, high-speed radio-frequency switch 7, variable amplitude attenuator 8.As shown in Figure 1, described high-speed radio-frequency switch 7 is subjected to the control of CPLD (CPLD) circuit 6.Include one minute three power splitter 10 in the receiver 9 shown in Figure 1, three tunnel radiofrequency signals of output are delivered to centre frequency by three different local oscillation signals of local frequency respectively after frequency mixer 11 mixing be f IIntermediate-frequency filter after obtain intermediate-freuqncy signal on centre frequency and positive and negative first sideband respectively, three tunnel intermediate-freuqncy signals are delivered to linear intermediate frequency amplifier 12, the gain amplifier unification of each linear intermediate frequency amplifier 12 is subjected to automatic gain control circuit 13 controls.Intermediate frequency and tributary signal are delivered to envelope detector 14, and two-way middle frequency difference signal is delivered to phase detector 15.The angular error signal that phase detector 15 obtains is delivered to beam-controller or radar servo control mechanism 16, as shown in Figure 2.

Described improvement project comprises following 15 kinds:

First kind of improvement project:

It is that the radar receiver 9 based on amplitude and difference monopulse system in the described basic scheme is replaced with based on the radar receiver of phase place with difference monopulse system, to realize the extraction of target angle information, as shown in Figure 3.

Second kind of improvement project:

It is but that the antenna array in the described basic scheme is installed on the antenna pedestal of mechanical rotation, and the phased scanning of antenna beam is combined with mechanical scanning, forms hybrid tracking radar.

The third improvement project:

It is that the analog and poor monopulse receiving system in the described basic scheme is replaced with digital and poor monopulse receiving system, with intermediate-freuqncy signal is local oscillation signal source 17 mixing of IF-FRE through frequency, after 18 samplings of A/D transducer, send into digital signal processor 19, as shown in Figure 4.

The 4th kind of improvement project:

It is to introduce the array density weighting in described basic scheme, among amplitude weighting and the phase weighting three any the two or adopt three kinds of weighted methods to design the dual-mode antenna battle array simultaneously.

The 5th kind of improvement project:

It is that the source time modulation battle array that has in the described basic scheme is replaced with passive time modulation array, or introduces the distributed receive-transmit system that contains high-powered sources on the submatrix rank.

The 6th kind of improvement project:

It is that the time modulation array in the described basic scheme is divided into some submatrixs, and each submatrix is taked different modulating frequencies.

The 7th kind of improvement project:

It is that monoplane amplitude in the described basic scheme and difference pulsed radar are extended to biplane amplitude and difference pulse, takes the radar receiving system in the described basic scheme on both direction respectively.

The 8th kind of improvement project:

It is that AGC (automatic gain control) the 13 intermediate frequency normalization that will be adopted with the difference Discr. in the described basic scheme replace with video normalization, as shown in Figure 5.

The 9th kind of improvement project:

But to be antenna array in first kind of improvement project be installed on the antenna pedestal of mechanical rotation for it, and the phased scanning of antenna beam is combined with mechanical scanning, forms hybrid tracking radar.

The tenth kind of improvement project:

It is that analog and poor monopulse receiving system replaces with digital and poor monopulse receiving system in first kind of improvement project, is local oscillation signal source 17 mixing of IF-FRE with intermediate-freuqncy signal through frequency, sends into digital signal processor 19 after 18 samplings of A/D transducer.

The 11 kind of improvement project:

It is to introduce the array density weighting in first kind of improvement project, among amplitude weighting and the phase weighting three any the two or adopt three kinds of weighted methods to design the dual-mode antenna battle array simultaneously.

The 12 kind of improvement project:

It is to have source time modulation battle array to replace with passive time modulation array in first kind of improvement project, or introduces the distributed receive-transmit system that contains high-powered sources on the submatrix rank.

The 13 kind of improvement project:

It is that the time modulation array in first kind of improvement project is divided into some submatrixs, and each submatrix is taked different modulating frequencies.

The 14 kind of improvement project:

It is in first kind of improvement project the monoplane amplitude and the difference pulsed radar be extended to the biplane amplitude and the difference pulse, on both direction, take the radar receiving system in described first kind of improvement project respectively.

The 15 kind of improvement project:

It is that AGC (automatic gain control) the 13 intermediate frequency normalization adopted with the difference Discr. in first kind of improvement project replace with video normalization, as shown in Figure 5.

Need to prove:

In the monopulse radar system that the present invention provides based on the Time Modulated Antenna battle array, by described array antenna unit 1, CPLD circuit 6, the time series of the time modulation transmitting-receiving array that high-speed radio-frequency switch 7 constitutes adopts has the time series of continuous type two way phase center moving characteristic.As shown in Figure 6, for a collinear array that contains N antenna element 1, (the service time τ of M<N), τ equals 2 (N-M) five equilibrium of this antenna radar passband B inverse, promptly at first leftmost M unit

τ = T 2 ( N - M )

The inverse of radar passband selects to equal the pulse width T transmitted

T = 1 B

After through a time step, leftmost antenna element 20 close and second still open simultaneously M+1 unit by open-minded to M.Like this second to M+1 unit opened radiated time τ again, the 3rd to M+2 unit radiated time τ again then, then and the like.If in each duration of pulse, participate in M mobile cell moving behind the low order end of array, M the unit 20 that then is in opening state is moved to the left the high order end up to array, makes the M that the is in opening state antenna element 20 in this time modulation array come and go the two ends, the left and right sides that are displaced into array with this.Fig. 7 has provided a time series chart with N=16 unit collinear array of above-mentioned continuous type two way phase center moving characteristic, wherein the array element number opened of each instantaneous moment or participate in the number of unit M=8 that moves.

Antenna element in described time modulation array equidistantly distributes, and the far-field pattern of its radiation is

U wherein k(t) be to describe the seasonal effect in time series function that has continuous type two way phase center moving characteristic among Fig. 7, after the far-field pattern of radiation carried out fourier progression expanding method, the far-field pattern of described time modulation array can be expressed as the far-field pattern sum of radiation on each sideband frequency component:

F wherein p=1/T pBe modulating frequency, T pBe modulation period, in having the time modulation line array of continuous type two way phase center moving characteristic, modulation period T pEqual to launch or the width of received pulse.Similarly, instantaneous excitation wherein carried out fourier progression expanding method after, can obtain the equivalent excitation value on each frequency component equally.Centre frequency that shown in Figure 8 is distributes mutually with the equivalence excitation width of cloth on first sideband.As shown in Figure 8, equivalence on centre frequency excitation is the gradual change equiphase and distributes, be easy to synthetic high-gain and wave beam; Equivalence on first sideband excitation amplitude is about array center's symmetry, and the element excitation amplitude of array center is far smaller than other unit in the array, and phase place is 180 ° of anti-phase distributions about array center, is easy to synthetic well behaved difference beam.

In the time modulation array of described continuous type two way phase center moving characteristic, when emission high-gain and wave beam, time series can not adopt the time series with two way phase center moving characteristic, can come the emission and the wave beam of obtained performance the best by technology for global optimization or the definite best time series of any other technology.When the receiving target echoed signal, time series then adopts the time series with continuous type two way phase center moving characteristic in the basic scheme, make and difference beam forms simultaneously and wave beam is distributed on the centre frequency, and two difference beams that form are distributed in sideband frequency and are respectively f 0+ f pAnd f 0-f pPositive and negative first sideband on.Under the prerequisite of not losing emission and wave beam and reception and difference beam performance, one or more unit of array center can be connect matched load, perhaps directly from array, remove, can reduce cost.

In the time modulation array of described continuous type two way phase center moving characteristic, described antenna element 1 can be common oriented antenna, also can adopt emission with polarization ability or receiving element to realize the emission and the reception of multipolarization signal.

Monopulse radar system based on the Time Modulated Antenna battle array provided by the invention, in the received beam one and wave beam produce on frequency separately with two difference beams simultaneously, realize the emission and the reception of while frequency diverse signals easily.Compare with the traditional array antenna because the new introducing of time degree of freedom in time modulation array antenna, make performance higher and difference beam (beam gain, zero is dark, zero point slope etc.) the synthetic possibility that becomes.When system is in emission state, distribute mutually and the time series of array by the appropriate design feed width of cloth, can on sideband, synthesize stronger interference source, satisfying to have increases the system requirements that enemy radar is scouted difficult application background, is applicable to simultaneously in the radar system of other target angle measurements and accurate angle tracking.

The basic scheme that we provide, as shown in Figure 1, circulator 2 and transmit-receive switch 4 play the conversion and the buffer action of transceiver channel under the control of the time unification equipment of radar system.She Ji time series can download in CPLD circuit 6 chips by cable in advance, can satisfy when transmitting and receiving the different requirements of seasonal effect in time series.As shown in Figure 2, the radiofrequency signal that receives contains the radiofrequency signal of same frequency component through one minute three power splitter 10 outputs three tunnel, include the radiofrequency signal on centre frequency and each sideband frequency in three tunnel radiofrequency signals of output respectively, the radiofrequency signals of three tunnel outputs are carried out mixing through the frequency source of different local frequencies respectively, and are f through centre frequency IIntermediate-frequency filter filtering after obtain the identical intermediate-freuqncy signal of IF-FRE.For obtain on the centre frequency with signal and positive and negative first sideband on difference signal, the local frequency of three frequency mixer 11 is elected f respectively as 0-f p-f I, f 0-f I, and f 0+ f 0-f I, this moment three tunnel intermediate-freuqncy signals that obtain comprised on the centre frequency with signal and positive and negative first sideband on the difference beam signal.Intermediate-freuqncy signal is amplified through linear amplifier, and realize the normalization of signal through automatic gain control (AGC) circuit, with intermediate-freuqncy signal respectively with two-way difference intermediate-freuqncy signal respectively in each phase detector 15 enterprising line phase detection, the output video angular error signal, and with these two the reflection same target azimuths signal carry out Error processing after, after changing it into dc error signal, send into beam-controller or radar servo control mechanism 16, thereby realize target angle measurement and precision tracking.As shown in Figure 2 and the wave beam radiofrequency signal to be distributed in frequency be f 0Centre frequency on, it is f that two difference beam radiofrequency signals are distributed in frequency respectively 0+ f pAnd f 0-f pPositive and negative first sideband on.Different with the radar system that adopts traditional dual-mode antenna array, the present invention can obtain two high frequency angular error signals in a target echo, thereby it is short than traditional array antenna radar system to obtain the angular error signal time; Ground of equal value, the angular measurement precision that obtains in the identical time is than traditional array antenna radar system height.

The basic scheme that we provide is the most basic scheme form, can do some on its basis and improve, and has just constituted the following improvement project based on Time Modulated Antenna battle array monopulse radar system:

First kind of improvement project, it is that the radar receiver 9 based on amplitude and difference monopulse system in the described basic scheme is replaced with based on the radar receiver of phase place with difference monopulse system, to realize the extraction of target angle information, as shown in Figure 3.With similar in the described basic scheme, the radiofrequency signal that receives is added to phase detector 15, output error voltage with the identical intermediate-freuqncy signal of frequency that obtains after power splitter 10 is divided into three tunnel radiofrequency signals and carries out respectively putting in mixing and the linearity.In this improvement project, described time modulation linear array is regarded as and is contained two sub antenna battle arrays with certain phase center distance, for the target in the wave beam, and the signal amplitude approximately equal that two wave beams in each difference beam receive.When target departed from axis of symmetry, two wave beams in each difference beam were because the existence of submatrix spacing can cause wave path-difference, and the size of this time difference signal can reflect that target departs from the degree of antenna axis, and phase place has reflected that then target departs from the direction of antenna axis.Different with the radar system that adopts traditional dual-mode antenna array, the present invention can obtain two high frequency angular error signals in a target echo, thereby it is short than traditional array antenna radar system to obtain the angular error signal time; Ground of equal value, the angular measurement precision that obtains in the identical time is than traditional array antenna radar system height.

Second kind of improvement project, it is but that the antenna array in the described basic scheme is installed on the antenna pedestal of mechanical rotation, the phased scanning of antenna beam is combined with mechanical scanning, form hybrid tracking radar, help following the tracks of single or multiple targets, assurance increases total tracking time to the tracking angular range of highest priority.

The third improvement project, it is that the analog and poor monopulse receiving system in the described basic scheme is replaced with digital and poor monopulse receiving system, with intermediate-freuqncy signal is local oscillation signal source 17 mixing of IF-FRE through frequency, after 18 samplings of A/D transducer, send into digital signal processor 19, as shown in Figure 4, in this digit receiver, the intermediate-freuqncy signal that receives is carried out secondary mixing and is obtained two-way zero intermediate frequency I, the Q orthogonal signal, and send into digital signal processor 19 through the digital signal that A/D transducer 18 converts homophase and quadrature to and carry out wave beam and form.

The 4th kind of improvement project, it is to introduce the array density weighting in described basic scheme, amplitude weighting, with among the phase weighting three any the two or adopt three kinds of weighted methods to design the dual-mode antenna battle array simultaneously, with realize Low Sidelobe and difference beam, or raising and difference beam gain, or improve the zero dark of difference beam, or improve the slope at zero point of difference beam.

The 5th kind of improvement project, it is that the source time modulation battle array that has in the described basic scheme is replaced with passive time modulation array, or on the submatrix rank, introduce the distributed receive-transmit system contain high-powered sources, this kind scheme helps reducing the complicacy that receives feeder network, reduce the number of receiver high frequency low noise amplifier 3, helped reducing the cost that wave beam forms.

The 6th kind of improvement project, it is that the time modulation array in the described basic scheme is divided into some submatrixs, each submatrix is taked different modulating frequencies, if use distributed feed receiving system on the submatrix rank, then can use the emissive source of different frequency on each submatrix.For the antenna array that contains two submatrixs, can form the launching beam of 6 different frequent points, comprising two centre frequency difference (f 1, f 2) launching beam, and the launching beam (f on four higher first sidebands of gain 1± f P1, f 2± f P2), f wherein P1With f P2Be two pairing different modulating frequencies of submatrix.In order to obtain the sideband radiation of different frequency, can be simply by changing the sideband radiation that modulating frequency obtains (modulation period) more frequency.In order further to increase the kind that transmits on the different frequency in the same time, can also different emissive sources be set on different submatrixs respectively realize by increasing the number of submatrix.This scheme is specially adapted to increase enemy radar and scouts in the radar system of difficult application background, compares with traditional phased-array radar, can the more easily interior at one time emission that realizes different frequency signals.

The 7th kind of improvement project, it is that monoplane amplitude in the described basic scheme and difference pulsed radar are extended to biplane amplitude and difference pulse, on both direction, take the radar receiving system in the described basic scheme respectively, can obtain azimuth error signal and elevation error signal respectively, thereby be implemented in the angle tracking on two planes in the orientation and the elevation angle.

The 8th kind of improvement project~the 15 kind of improvement project has following 4 kinds of features at least:

(1) by the time series work with two way phase center moving characteristic, this time series is produced by CPLD circuit 6 described antenna element 1, as shown in Figure 1 under the control of high-speed radio-frequency switch 7;

(2) contain one minute three power splitter 10 in the receiver 9, as shown in Figure 2;

(3) contain the different local vibration source of frequency in the receiver 9, as shown in Figure 2;

(4) contain beam-controller or mechanical radar servo control mechanism 16 in the radar receiving system, as shown in Figure 2.

Therefore, these monopulse radar system schemes based on the Time Modulated Antenna battle array have pairing characteristics respectively, in the received beam one and wave beam produce on frequency separately with two difference beams simultaneously, realize the emission and the reception of while frequency diverse signals easily.Compare with the traditional array antenna because the new introducing of time degree of freedom in time modulation array antenna, make performance higher and difference beam (beam gain, zero is dark, zero point slope etc.) the synthetic possibility that becomes.When system is in emission state, distribute mutually and the time series of array by the appropriate design feed width of cloth, can on sideband, synthesize stronger interference source, satisfying to have increases the system requirements that enemy radar is scouted difficult application background, is applicable to simultaneously in the radar system of other target angle measurements and accurate angle tracking.

The present invention has following beneficial effect:

(1). with difference beam independent formation on different frequencies, make the antenna device arrangement compactness.

(2). the wave beam performance that transmits and receives state is easy to regulate, and implementation is flexible, and is workable.

(3). to a target echo signal, can on different frequency, form two difference beams simultaneously, make angular error signal abundant, further improve the performance of radar system.

(4). use same emissive source simultaneously emission detection signal and undesired signal, make the radar system strong security.

Description of drawings

Fig. 1 be monopulse radar of the present invention device transmit and receive front end

Wherein, the 1st, antenna element, the 2nd, circulator, the 3rd, high frequency low noise amplifier, the 4th, transmit-receive switch, the 5th, phase shifter, the 6th, CPLD circuit, the 7th, high-speed radio-frequency switch, the 8th, variable amplitude attenuator, the 9th, high-frequency signal receiver module;

Fig. 2 is the receiving system block diagram of amplitude and difference monopulse system

Wherein, the 10th, power splitter, the 11st, frequency mixer, the 12nd, linear intermediate frequency amplifier, the 13rd, automatic gain control circuit, the 14th, envelope detector, the 15th, phase detector, the 16th, beam-controller or radar servo control mechanism, the 22nd, intermediate-frequency filter;

Fig. 3 is the receiving system block diagram of phase place and difference monopulse system;

Fig. 4 is the digital receiving system block diagram of amplitude provided by the invention and difference monopulse system

Wherein, the 17th, intermediate frequency local oscillator source, the 18th, A/D (analog/digital) converter, the 19th, digital signal processor;

Fig. 5 is the receiving system block diagram of employing video provided by the invention normalization and difference Discr.

Fig. 6 is a two way phase Mobility Center seasonal effect in time series time modulation array antenna provided by the invention

Wherein, the 20th, be in opening state antenna element, the 21st, be in the antenna element of off-state;

Fig. 7 is the synoptic diagram of opening Yu disconnecting of two way phase Mobility Center seasonal effect in time series antenna element 1 provided by the invention;

The width of cloth of the equivalence excitation that Fig. 8 is a two way phase Mobility Center time series time modulation array antenna provided by the invention on centre frequency and positive and negative first sideband is distribution plan mutually;

Fig. 9 is the normalization antenna pattern on centre frequency and first sideband among the embodiment 1;

Figure 10 is the normalization antenna pattern on second sideband and the 3rd sideband among the embodiment 1;

Figure 11 is the normalization antenna pattern when the normalization antenna pattern on the centre frequency among the embodiment 1 and first sideband is implemented electron scanning;

Figure 12 is the normalization antenna pattern on centre frequency and first sideband among the embodiment 2;

Figure 13 is the normalization antenna pattern on second sideband and the 3rd sideband among the embodiment 2.

Embodiment

Embodiment 1: based on the phased array monopulse radar device (inhibition of high-order sideband) of Time Modulated Antenna battle array

With reference to Fig. 1 and Fig. 6, present embodiment adopts the time modulation array that is made of N=16 unit omni-directional array element, the array number M=8 that opens in each time step.In order to obtain well behaved reception and difference beam, be higher gain and difference beam, lower null depth difference beam, and bigger difference beam slope at zero point, adopt differential evolution algorithm (Differential Evolution Strategy) to determine design variable in the present embodiment, the performance of reception and difference beam is optimized in the static stimulation amplitude of this time modulation array and the locus of unit as the design variable in the present embodiment.In addition, the unhelpful sideband radiation that is higher than first sideband will be suppressed as one of optimization aim to system.Fig. 9 and Figure 10 have provided centre frequency and the first, two respectively, the normalized radiation pattern on three sidebands, and the result shows and has synthesized on the centre frequency and wave beam, the positive first sideband f 0+ f pOn synthesized difference beam, the negative first sideband f 0-f pOn have same difference beam.The directivity factor of difference beam than and wave beam hang down 4dB, unhelpful high-order sideband radiation is suppressed to-below the 12dB.As shown in Figure 2, resulting and the local vibration source mixing of difference signal through different local frequencies, and after intermediate-frequency filter filtering, can obtain the intermediate-freuqncy signal of identical IF-FRE, the intermediate-freuqncy signal of gained is sent into phase detector 15 after linear intermediate frequency amplifier 12 amplifies can get angular error signal, and angular error signal sent into radar servo control mechanism or Beam-former, realize the angle tracking of radar.Carry out the range finding of target and send into envelope detector 14 with signal.

Figure 11 has provided according to traditional phased array theory, by changing the phase-shift phase of phase shifter 5, implements to electronically scan to leave the scan angle of gust method of principal axes to 10 ° in direction, and the result shows the scanning angle that scans this formulation with difference beam together.

In the present embodiment, we carry out Density Weighted and amplitude weighting with the modulation transmitting-receiving of the time in basic scheme array, and the array element equiphase distributes.But be appreciated that optimum and difference beam optimization in Properties among the present invention are not limited to this kind method of weighting, can also adopt any optimisation technique, any method of weighting (comprise the time series with two way phase center moving characteristic abandoned herein then adopt other forms of time series) realizes optimum and the difference beam while realizes on different frequency.In addition, electron scanning in the present embodiment is only implemented according to traditional phased array is theoretical, be appreciated that the electronic scanning technique among the present invention and not only be confined to this, can also be in scanning process the directional diagram that secondary lobe is raised or other may bring that causes when avoiding scanning wide-angle of real time altering time series worsen.

Embodiment 2: based on the phased array monopulse radar device (no high-order sideband suppresses) of Time Modulated Antenna battle array

With reference to Fig. 1 and Fig. 6, present embodiment still adopts the time modulation array that is made of N=16 unit omni-directional array element, the array number M=8 that opens in each time step.In order to obtain well behaved reception and difference beam, be higher gain and difference beam, lower null depth difference beam, and bigger difference beam slope at zero point, adopt differential evolution algorithm to determine design variable in the present embodiment, the performance of reception and difference beam is optimized in the static stimulation amplitude of this time modulation array and the locus of unit as the design variable in the present embodiment.In addition, the unhelpful sideband radiation that is higher than first sideband is not suppressed as one of optimization aim to system in the present embodiment.Figure 12 and Figure 13 have provided centre frequency and the first, two respectively, the normalized radiation pattern on three sidebands, and the result shows and has synthesized on the centre frequency and wave beam, the positive first sideband f 0+ f pOn synthesized difference beam, the negative first sideband f 0-f pOn have same difference beam.The directivity factor of difference beam than and wave beam only low-3.4dB, yet unhelpful high-order sideband radiation but is lifted to-5dB.As shown in Figure 2, resulting and the local vibration source mixing of difference signal through different local frequencies, and after intermediate-frequency filter filtering, can obtain the intermediate-freuqncy signal of identical IF-FRE, the intermediate-freuqncy signal of gained is sent into phase detector 15 after linear intermediate frequency amplifier 12 amplifies can get angular error signal, and angular error signal sent into radar servo control mechanism or Beam-former, realize the angle tracking of radar.Carry out the range finding of target and send into envelope detector 14 with signal.

In the present embodiment, we carry out Density Weighted and amplitude weighting with the modulation transmitting-receiving of the time in basic scheme array, and the array element equiphase distributes.But be appreciated that optimum and difference beam optimization in Properties among the present invention are not limited to this kind method of weighting, can also adopt any optimisation technique, any method of weighting (comprise the time series with two way phase center moving characteristic abandoned herein then adopt other forms of time series) realizes optimum and the difference beam while realizes on different frequency.In addition, still can take electron scanning mode among the embodiment 1 in the present embodiment.

More than, provide description of the invention 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 not only is limited to scheme described here, but the scope consistent with described claim.

Claims (11)

1. monopulse radar system based on the Time Modulated Antenna battle array, it comprises the aerial array of being made up of the antenna element of transmit-receive sharing (1), wherein each antenna element (1) all is connected to circulator (2) and transmit-receive switch (4), described each antenna element (1) also is connected to low noise amplifier (3), phase shifter (5), high-speed radio-frequency switch (7), variable amplitude attenuator (8) constitutes the feeding network of dual-mode antenna battle array.Described high-speed radio-frequency switch (7) is subjected to the control of CPLD (CPLD) circuit (6).Receiver (9) includes one fen power splitter (10) of three, three tunnel radiofrequency signals of output respectively by the different local oscillation signal of three local frequencies after frequency mixer (11) mixing, deliver to linear intermediate frequency amplifier (12) after delivering to intermediate-frequency filter (22) filtering, the gain amplifier unification of each linear intermediate frequency amplifier is subjected to automatic gain control circuit (13) control.One road intermediate frequency and tributary signal are delivered to envelope detector (14), and intermediate frequency and signal and two-way middle frequency difference signal are delivered to phase detector (15).The angular error signal that phase detector (15) obtains is delivered to beam-controller or radar servo control mechanism (16).
2. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that described antenna element (1) is provided with circulator (2), transmit-receive switch (4) and low noise amplifier (3).
3. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1, its feature are that also the feeder equipment in the described antenna element (1) includes phase shifter (5), high-speed radio-frequency switch (7), variable amplitude attenuator (8).
4. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that it also comprises a CPLD (CPLD) circuit (6).
5. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that it comprises that also three centre frequencies are f 1Intermediate-frequency filter (22).
6. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that it also comprises and includes one fen power splitter (10) of three.
7. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that it also comprises three frequency mixer (11) that the local vibration source frequency is different.
8. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that it also comprises automatic gain control circuit (13) in the receiving system, envelope detector (14) and phase detector (15).
9. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that it also comprises beam-controller or radar servo control mechanism (16).
10. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1 is characterized in that it also comprises A-D converter (18) and digital signal processor (19).
11. the monopulse radar system based on the Time Modulated Antenna battle array according to claim 1, it is characterized in that it also is included in the instantaneous moment, have only M work antenna element (20) and N-M antenna element (21) that disconnects in the described aerial array.
CNA2008100444261A 2008-05-22 2008-05-22 Monopulse radar system based on time modulation antenna array CN101587188A (en)

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