CN103490164B - Based on the single channel array emitter antenna of phase Code modulation - Google Patents

Based on the single channel array emitter antenna of phase Code modulation Download PDF

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CN103490164B
CN103490164B CN201310470659.9A CN201310470659A CN103490164B CN 103490164 B CN103490164 B CN 103490164B CN 201310470659 A CN201310470659 A CN 201310470659A CN 103490164 B CN103490164 B CN 103490164B
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antenna
phase
level
phase code
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CN103490164A (en
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张林让
唐世阳
郭苹
罗丰
刘楠
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Xidian University
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Xidian University
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Abstract

The invention discloses a kind of single channel array emitter antenna based on phase Code modulation, mainly solve the amplitude phase unbalance problem that existing conventional arrays sending antenna structure is complicated, size is large, price is high and multichannel causes.It comprises: waveform generator (1), one-level modulation phase shifter (2), digital to analog converter (3), upconverter (4), low noise amplifier (5), secondary modulation phase shifter (6) and antenna oscillator (7).The signal that waveform generator (1) produces carries out bi-phase modulated by one-level modulation phase shifter and is polymerized to single channel signal, this signal amplifies through the conversion of digital to analog converter (3) signal form, upconverter (4) mixing, low noise amplifier (5) successively, obtain analog radio-frequency signal, this signal exports as multi channel signals by (6) quadrature demodulation of secondary modulation phase shifter and filtering process, and this signal is launched after carrying out signal form conversion by oscillator (7).The present invention under the prerequisite that can reach conventional arrays transmitting antenna performance, the amplitude-phase consistency simplifying the structure, reduce size, improve antenna.

Description

Based on the single channel array emitter antenna of phase Code modulation
Technical field
The invention belongs to antenna technical field, particularly single channel array emitter antenna, particularly a kind of single channel array emitter antenna being realized multi channel signals by phase Code modulation polymerization and demodulation recovery, can be used for communication and Radar Signal Processing.
Background technology
Antenna, as a requisite device in radiotechnics equipment, is widely used in the radio art such as communication, radar, navigation, broadcast, TV, and by radio wave, radiation and reception carry out transmission of information effectively for they.In recent years, increasing based on the application of military array antenna technique in economic construction, range of application constantly expands.Array antenna technique occurs that in economic construction, scientific research new demand is also the motive force of array antenna technique.The feature of modern array emitter antenna is mainly reflected in band-wise processing technically, namely utilizes parallel circuit to multiple signals parallel processing.Multichannel transmits compared to the advantage having and control flexibly beam position and beam shape that transmits of mechanical antenna, also these advantages focus of making array emitter antenna become people extensively to study just.But in practical engineering application, due to the difference of device precision, the various error of inevitable generation, mutual coupling, the signal to noise ratio of such as antenna are low, the amplitude phase unbalance etc. of passage, actual array manifold is caused often to occur deviation to a certain degree or disturbance, make the performance meeting severe exacerbation of array emitter antenna, even lost efficacy.
In addition, array emitter antenna technology for communicating, another major obstacle of the system such as radio frequency perception and radar is requirement to cost, size, weight.First, each antenna oscillator end of conventional arrays transmitting antenna is all connected with one and includes the devices such as upconverter, DAC, memory and transceiver, because the high and usage quantity of high performance device price is large, thus significantly increases the cost of array antenna; Secondly, for large-scale array, the relevant design of conventional arrays transmitting antenna and problem of implementation are the stationary problems of all passages in actual volume and temperature range.Each passage due to conventional arrays transmitting antenna mostly is high-frequency electron device composition and uses on a large scale, and this is by the restricted gender of the electronic equipment volume that causes antenna end subsidiary, and the region being particularly useful for dispelling the heat is very limited.
Summary of the invention
The object of the invention is to the deficiency for above-mentioned prior art, propose a kind of single channel array emitter antenna based on phase Code modulation, with reduce antenna be limited to size and cost impact, improve passage amplitude-phase consistency and signal to noise ratio.
For achieving the above object, the present invention includes: waveform generator, digital to analog converter, upconverter, low noise amplifier and antenna oscillator, is characterized in that:
M one-level modulation phase shifter is connected with between waveform generator and digital to analog converter, for producing one group of phase Code by the mode of phase shift, carry out bi-phase modulated with the signal exported waveform generator, and positive crosslinking polymerization process is carried out to the signal after modulation, wherein, M is antenna oscillator number;
Be connected with M secondary modulation phase shifter between low noise amplifier and antenna oscillator, for generation of phase Code, carry out demodulation process with the single channel signal exported low noise amplifier, recover to obtain multi-path digital baseband signal, wherein, M is antenna oscillator number.
As preferably, each one-level modulation phase shifter of the above-mentioned single channel array emitter antenna based on phase Code modulation comprises one-level logic module, one-level gating switch and aggregation transfer module, and wherein, M is antenna oscillator number;
Described one-level logic module, for generation of phase Code code element p m, and control one-level gating switch signal is modulated, this p m={ p 0(t) ... p m(t) ... p m-2(t) p m-1(t) }, wherein, p mt () is the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutual orthogonality, m=0,1,2 ... M-2, M-1, M are antenna oscillator number;
Described one-level gating switch, for modulating the output signal of waveform generator, obtaining the signal after modulating is: S={ Γ p 0(t) ω 0Γ p m(t) ω mΓ p m-1(t) ω m-1, wherein, Γ is signal amplitude, ω mfor the baseband signal that waveform generator produces, m=0,1,2 ... M-2, M-1;
Described aggregation transfer module, for being polymerized the output signal of one-level gating switch, obtains aggregate signal S aggrfor: S aggr = Σ m = 0 M - 1 Γp m ( t ) ω m .
As preferably, each secondary modulation phase shifter of the above-mentioned single channel array emitter antenna based on phase Code modulation, comprise two-level logic module and secondary gating switch, wherein, M is antenna oscillator number;
Described two-level logic module, for generation of phase Code code element q m, and control secondary gating switch and demodulation is carried out to signal, this q m={ q 0(t) ... q m(t) ... q m-2(t) q m-1(t) }, wherein, q mt () is the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutual orthogonality, m=0,1,2 ... M-2, M-1, M are antenna oscillator number;
Described secondary gating switch, for carrying out demodulation to the output signal of low noise amplifier, obtains the multichannel baseband signal S after demodulation demodfor:
S demod＝{q 0·S digtal_aggrq 1·S digtal_aggr… q m·S digtal_aggr… q M-1·S digtal_aggr}，
Wherein, S digtal_aggrfor the output signal of low noise amplifier, m=0,1,2 ... M-2, M-1.
As preferably, the antenna oscillator of the above-mentioned single channel array emitter antenna based on phase Code modulation, the structure that the metal, rod-shaped pipe adopting M size identical is arranged in parallel, the length L=k λ of each metal tube, equidistantly be fixed on T-shaped bracing frame, wherein, λ is signal wavelength, k is coefficient, k=14 or k=12.
The present invention compared with prior art tool has the following advantages:
1, the present invention is owing to being provided with one-level modulation phase shifter, the orthogonal phase Code utilizing one-level to modulate phase shifter generation carries out modulation polymerization to digital baseband signal, obtain single channel signal, considerably reduce the electronic device needed for band-wise processing, thus reduce volume and the cost of array emitter antenna.
2, the present invention is owing to being provided with one-level modulation phase shifter and secondary modulation phase shifter, multi channel signals modulation is aggregated into single channel signal and processes by the orthogonal phase Code produced by one-level modulation phase shifter, and by secondary modulation phase shifter demodulation restoring signal, can be good at the problem of mutual coupling and the amplitude phase unbalance existed between Solving Multichannel.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the waveform real part schematic diagram that in the present invention, waveform generator produces;
Fig. 3 is the one-level modulation phase shifter structure schematic diagram in the present invention;
Fig. 4 is the secondary modulation phase shifter structure schematic diagram in the present invention;
Fig. 5 is the output signal schematic diagram of one-level of the present invention modulation phase shifter;
Fig. 6 is the output signal schematic diagram of secondary modulation phase shifter of the present invention;
Fig. 7 is the antenna oscillator structure chart in the present invention;
Fig. 8 is that the present invention emulates array antenna layout and emission angle hum pattern;
Fig. 9 is the angular spectrum contrast schematic diagram of the present invention and conventional arrays antenna transmission signal.
Embodiment
With reference to Fig. 1, the present invention includes: the modulation of waveform generator 1, one-level phase shifter 2, digital to analog converter 3, upconverter 4, low noise amplifier 5, secondary modulation phase shifter 6 and antenna oscillator 7.Wherein: M one-level modulation phase shifter 2 is connected between the output of waveform generator 1 and the input of digital to analog converter 3, the output of digital to analog converter 3 is connected with the input of upconverter 4, low noise amplifier 5 is connected between the output of upconverter 4 and the input of M secondary modulation phase shifter 6, the output of M secondary modulation phase shifter 6 is connected to the input of antenna oscillator 7, wherein, M is antenna oscillator number.The structure of each parts is as follows:
Described waveform generator 1, adopts but is not limited to the device of 33219A model, and its signal exported is multichannel baseband digital signal, and it is 10 that this example gets port number, and this multichannel baseband digital signal exports to one-level modulation phase shifter 2.As shown in Figure 2, wherein Fig. 2 (a) and Fig. 2 (c) are the signal waveform that two edge gateways export to baseband digital signal waveform, the signal waveform that centered by Fig. 2 (b), passage exports.
With reference to Fig. 3, each one-level modulation phase shifter 2 comprises one-level logic module 21, one-level gating switch 22 and aggregation transfer module 23;
This one-level logic module 21, its input is connected with the output of waveform generator 1, and this module is made up of the first logical circuit C1 and the first transistor G1, and wherein the first logical circuit C1 employing resistance, electric capacity, reactance build; By controlling electric current and the voltage of the first logical circuit C1 output, making the first transistor G1 be in the state of being turned on or off, namely producing phase Code code element p m(t), this phase Code has zero and lacks autocorrelation, and meets mutual orthogonality, m=0,1,2 ... M-2, M-1, M are antenna oscillator number;
This one-level gating switch 22, built by transistor seconds G2 and form, its input is connected to the output of one-level logic module 21, by the phase Code code element in one-level logic module 21, transistor seconds G2 is made to be in conducting and off-state, the i.e. open and close state of switch, for modulating the output signal of antenna oscillator 1, obtaining the signal after modulating is S={ Γ p 0(t) ω 0Γ p m(t) ω mΓ p m-1(t) ω m-1, wherein, Γ is the amplitude that transmits, ω mfor the baseband signal that waveform generator produces, m=0,1,2 ..., M-1;
This aggregation transfer module 23, its output is connected with digital to analog converter 3, this module is made up of the second logical circuit C2 and third transistor G3, wherein the second logical circuit C2 employing resistance, electric capacity, reactance build, by controlling electric current and the voltage of the second logical circuit C2 output, third transistor G3 is made to be in the state of being turned on or off, to realize the gating polymerization of multiple signals, aggregate signal S aggrfor: aggregate signal waveform as shown in Figure 5.
Described digital to analog converter 3, adopts but is not limited to the device of AD5755 model, and the output signal of frequency modulator 2 is by the decoding summation process of digital to analog converter 3, and obtain analog signal, this signal outputs to upconverter 4.
Described upconverter 4, adopt but be not limited to the device of MAX2044 model, the output signal of digital to analog converter 3, by the Frequency mixing processing of upconverter 4, obtains up-conversion signal, and this signal outputs to low noise amplifier 5.
Described low noise amplifier 5, adopt but be not limited to the device of LMP7711 model, the signal that upconverter 4 exports is by the amplification process of this low noise amplifier 5, and obtain gain amplifying signal, this signal outputs to secondary modulation phase shifter 6.
With reference to Fig. 4, each secondary modulation phase shifter 6 comprises two-level logic module 61 and secondary gating switch 62;
This two-level logic module 61, its input is connected with the output of low noise amplifier 5, and this module is made up of the 3rd logical circuit C3 and the 4th transistor G4, and wherein the 3rd logical circuit C3 employing resistance, electric capacity, reactance build; By controlling electric current and the voltage of the 3rd logical circuit C3 output, making the 4th transistor G4 be in the state of being turned on or off, namely producing phase Code code element q m(t), this phase Code has zero and lacks autocorrelation, and meets mutual orthogonality, m=0,1,2 ... M-2, M-1, M are antenna oscillator number;
This secondary gating switch 62, built by the 5th transistor G5 and form, its input is connected to the output of two-level logic module 61, by the phase Code code element in two-level logic module 61, the 5th transistor G5 is made to be in conducting and off-state, the i.e. open and close state of switch, for carrying out demodulation to the output signal of low noise amplifier 5, obtains the multichannel baseband signal S after demodulation demodfor:
S demod＝{q 0·S digtal_aggrq 1·S digtal_aggr… q m·S digtal_aggr… q M-1·S digtal_aggr}，
Wherein, S digtal_aggrfor the output signal of low noise amplifier 5, m=0,1,2 ... M-2, M-1, the multichannel baseband signal waveform that secondary modulation phase shifter 6 exports as shown in Figure 6, the wherein edge gateway signal waveform that exports for secondary modulation phase shifter of Fig. 6 (a) and Fig. 6 (c), the edge gateway signal waveform that Fig. 6 (b) exports for secondary modulation phase shifter.
With reference to Fig. 7, described antenna oscillator 7, the shaft-like hollow metal tube 71 identical by M size forms, and wherein, M >=2, this example gets M=10.The parallel equidistant arrangement of these metal tubes, is fixed on T-shaped support bar 72; The length L=k λ of each metal tube, wherein, λ is signal wavelength, and k is coefficient, k=14 or k=12 is all connected with sensor unit 73 in the cavity of each metal tube, and the output of each sensor unit 73 is connected with a secondary modulation phase shifter 6.Whole antenna oscillator 7 is placed on without there being the clearing blocked, and the signal of telecommunication that secondary modulation phase shifter 6 exports is converted to electromagnetic wave signal through sensor unit, and the port that this signal is input to metal tube is launched.
Effect of the present invention is verified further by following emulation.
1. experiment scene:
As shown in Figure 8, it is that the present invention emulates array antenna layout and emission angle hum pattern, and the position coordinates of inventive antenna and conventional arrays transmitting antenna is all (0,0) km, and array antenna is provided with 10 antenna oscillators; In simulating scenes, launching beam orientation angle is set to+45 °.
2. experiment content and result:
Obtain transmitting of diverse location by antenna scanning spatial domain, this scan sector scope is-90 ° ~+90 °.Wave beam forming is carried out respectively with conventional arrays transmitting antenna and transmitting of these two kinds of antennas of the present invention, obtain angular power spectrogram, as shown in Figure 9, the dotted line wherein in Fig. 9 is the power azimuth spectrum of conventional arrays antenna, and the solid line of Fig. 9 is power azimuth spectrum of the present invention.
Can be seen by the contrast of Fig. 9 dotted portion and Fig. 9 bold portion: when the present invention reduces at designs simplification, smaller volume, device, cost reduces, can reach same with conventional arrays antenna accurate to launching the control pointed to, and same beam resolution can be reached.

Claims (2)

1. the single channel array emitter antenna based on phase Code modulation, comprise: waveform generator (1), digital to analog converter (3), upconverter (4), low noise amplifier (5) and antenna oscillator (7), is characterized in that:
Be connected with M one-level between described waveform generator (1) and digital to analog converter (3) and modulate phase shifter (2), for producing one group of phase Code by the mode of phase shift, bi-phase modulated is carried out with the signal exported waveform generator (1), and positive crosslinking polymerization process is carried out to the signal after modulation, wherein, M is antenna oscillator number;
Each one-level modulation phase shifter (2) comprises one-level logic module (21), one-level gating switch (22) and aggregation transfer module (23);
This one-level logic module (21), for generation of phase Code code element p m, and control one-level gating switch (22) signal is modulated, this p m={ p 0(t) ... p m(t) ... p m-2(t) p m-1(t) }, wherein, p mt () is the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutual orthogonality, m=0,1,2 ... M-2, M-1, M are antenna oscillator number;
This one-level gating switch (22), for modulating the output signal of waveform generator (1), obtaining the signal after modulating is: S={ Γ p 0(t) ω 0Γ p m(t) ω mΓ p m-1(t) ω m-1, wherein, Γ is signal amplitude, ω mfor the baseband signal that waveform generator produces, m=0,1,2 ... M-2, M-1;
This aggregation transfer module (23), for being polymerized the output signal of one-level gating switch (22), obtains aggregate signal S aggrfor: S a g g r = Σ m = 0 M - 1 Γp m ( t ) ω m ;
M secondary modulation phase shifter (6) is connected with between described low noise amplifier (5) and antenna oscillator (7), for generation of phase Code, carry out demodulation process with the single channel signal exported low noise amplifier (5), obtain multi-channel analog radiofrequency signal;
Each secondary modulation phase shifter (6), comprises two-level logic module (61) and secondary gating switch (62);
This two-level logic module (61), for generation of phase Code code element q m, and control secondary gating switch (62) and demodulation is carried out to signal, this q m={ q 0(t) ... q m(t) ... q m-2(t) q m-1(t) }, wherein, q mt () is the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutual orthogonality, m=0,1,2 ... M-2, M-1, M are antenna oscillator number;
This secondary gating switch (62), for carrying out demodulation to the output signal of low noise amplifier (5), obtains the multichannel baseband signal S after demodulation demodfor:
S demod＝{q 0·S digtal_aggrq 1·S digtal_aggr… q m·S digtal_aggr… q M-1·S digtal_aggr}，
Wherein, S digtal_aggrfor the output signal of low noise amplifier (5), m=0,1,2 ... M-2, M-1.
2. the single channel array emitter antenna based on phase Code modulation according to claim 1, it is characterized in that, described antenna oscillator (7), adopt metal, rod-shaped pipe formation arranged in parallel M antenna oscillator that M size is identical, the length L=k λ of each metal tube, is equidistantly fixed on T-shaped bracing frame, wherein, λ is signal wavelength, and k is coefficient, k=1/4 or k=1/2.
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CN103779659B (en) * 2014-01-24 2016-03-02 西安电子科技大学 Based on the single channel array emitter antenna of frequency precoding
CN105891783A (en) * 2016-04-05 2016-08-24 中国科学院上海微系统与信息技术研究所 Phase control system for phased array/MIMO radar
CN107329109B (en) * 2017-06-21 2020-04-03 中国电子科技集团公司第三十六研究所 Array signal receiving method and device

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Publication number Priority date Publication date Assignee Title
JP2001069053A (en) * 1999-08-26 2001-03-16 Toshiba Tec Corp Directional antenna system
CN101015138A (en) * 2004-09-10 2007-08-08 皇家飞利浦电子股份有限公司 Wireless communication apparatus with multiple antennas and method thereof
JP2007081646A (en) * 2005-09-13 2007-03-29 Toshiba Corp Transmitting/receiving device
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