CN103490164A - Single-channel array transmitting antenna based on two-phase code modulation - Google Patents

Single-channel array transmitting antenna based on two-phase code modulation Download PDF

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CN103490164A
CN103490164A CN201310470659.9A CN201310470659A CN103490164A CN 103490164 A CN103490164 A CN 103490164A CN 201310470659 A CN201310470659 A CN 201310470659A CN 103490164 A CN103490164 A CN 103490164A
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phase code
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CN103490164B (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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Abstract

The invention discloses a single-channel array transmitting antenna based on two-phase code modulation. The antenna mainly solves the problems that an existing common array transmitting antenna is complex in structure, large in size, high in price and inconsistent in amplitude phase due to multiple channels. The single-channel array transmitting antenna comprises a waveform generator (1), a first-level modulation phase shifter (2), a digital-to-analog converter (3), an up converter (4), a low-noise amplifier (5), a second-level modulation phase shifter (6) and an antenna element (7), wherein two-phase modulation is carried out on a signal produced by the waveform generator (1) through the first-level modulation phase shifter to form a single-channel signal in a polymerization mode, the signal sequentially undergoes signal form conversion through the digital-to-analog converter (3), frequency mixing through the up converter (4) and amplification through the low-noise amplifier (5), then a simulation radio-frequency signal is obtained, the signal undergoes orthogonal demodulation and filtering processing through the second-level modulation phase shifter (6) and is output as a multi-channel signal, and the signal undergoes signal form conversion through the antenna element (7) to be transmitted. On the premise that conventional array transmitting antenna performance is guaranteed, the structure is simplified, the size is reduced, and amplitude phase consistency of the antenna is improved.

Description

Single channel array transmitting antenna based on the phase Code modulation
Technical field
The invention belongs to antenna technical field, particularly single channel array transmitting antenna, particularly a kind ofly modulate by phase Code the single channel array transmitting antenna that polymerization and demodulation recover to realize multi channel signals, 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 fields such as communication, radar, navigation, broadcast, TV, and it is by radio wave radiation and receive transmission of information effectively.In recent years, the military application of array antenna technology in economic construction as the master of take is increasing, and range of application constantly enlarges.The array antenna technology is occurring aspect economic construction, scientific research that new demand is also the motive force of array antenna technology.The characteristics of modern array transmitting antenna are mainly reflected on the multichannel treatment technology, utilize parallel circuit to the multiple signals parallel processing.Multichannel emission signal has advantages of flexible control beam position and beam shape than transmitting of mechanical antenna, and also these advantages make the array transmitting antenna become the focus of people's broad research just.Yet in practical engineering application, difference due to the device precision, inevitably produce various errors, mutual coupling, signal to noise ratio such as antenna width low, passage is mutually inconsistent etc., cause actual array manifold to tend to occur deviation or disturbance to a certain degree, make the performance meeting severe exacerbation of array transmitting antenna, even lost efficacy.
In addition, array transmitting antenna technology is the requirement to cost, size, weight for another major obstacle of the systems such as communication, radio frequency perception and radar.At first, each antenna oscillator end of conventional arrays transmitting antenna all is connected with one and includes the devices such as upconverter, DAC, memory and transceiver, because the high performance device price is high and usage quantity is large, thereby has increased greatly 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.Because each passage of conventional arrays transmitting antenna mostly is, high-frequency electron device forms and extensive the use, the restricted gender that this will cause the subsidiary electronic equipment volume of antenna end, and the zone that is particularly useful for heat radiation is very limited.
Summary of the invention
The object of the invention is to the deficiency for above-mentioned prior art, proposed a kind of single channel array transmitting antenna based on the phase Code modulation, be limited to impact, raising passage amplitude-phase consistency and the signal to noise ratio of size and cost to reduce antenna.
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:
Be connected with M one-level modulation phase shifter between waveform generator and digital to analog converter, produce one group of phase Code for the mode by phase shift, carry out bi-phase modulated with the signal to waveform generator output, and the signal after modulation is carried out to positive crosslinking polymerization processing, wherein, M is the antenna oscillator number;
Be connected with M secondary modulation phase shifter between low noise amplifier and antenna oscillator, for generation of phase Code, with the single channel signal to low noise amplifier output, carry out demodulation process, recover to obtain the multi-path digital baseband signal, wherein, M is the antenna oscillator number.
As preferably, each one-level modulation phase shifter of the above-mentioned single channel array transmitting antenna based on the phase Code modulation comprises one-level logic module, one-level gating switch and polymerization transport module, and wherein, M is the antenna oscillator number;
Described one-level logic module, for generation of phase Code code element p m, and control the 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 m(t) be the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutually orthogonal property, m=0,1,2 ... M-2, M-1, M is the antenna oscillator number;
Described one-level gating switch, modulated for the output signal to waveform generator, and the signal after being modulated 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 polymerization transport module, carry out polymerization for the output signal to the 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 transmitting antenna based on the phase Code modulation, comprise two-level logic module and secondary gating switch, and wherein, M is the antenna oscillator number;
Described two-level logic module, for generation of phase Code code element q m, and control the secondary gating switch and signal is carried out to demodulation, this q m={ q 0(t) ... q m(t) ... q m-2(t) q m-1(t) }, wherein, q m(t) be the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutually orthogonal property, m=0,1,2 ... M-2, M-1, M is the antenna oscillator number;
Described secondary gating switch, carry out demodulation for the output signal to low noise amplifier, obtains the multichannel baseband signal S after demodulation demodfor:
S demod＝{q 0·S digtal_aggr?q 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 transmitting antenna based on the phase Code modulation, the structure that adopts M the identical metal, rod-shaped pipe of size to be arranged in parallel, the length L of each metal tube=k λ, 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 has following advantage:
1, the present invention is owing to being provided with one-level modulation phase shifter, the quadrature phase Code that utilizes one-level modulation phase shifter to produce is modulated polymerization to digital baseband signal, obtain single channel signal, greatly reduce multichannel and processed required electronic device, thereby reduced volume and the cost of array transmitting antenna.
2, the present invention is owing to being provided with one-level modulation phase shifter and secondary modulation phase shifter, the quadrature phase Code of modulating the phase shifter generation by one-level aggregates into single channel signal by the multi channel signals modulation and is processed, and by secondary modulation phase shifter demodulation restoring signal, the mutual coupling that can be good at existing between Solving Multichannel and the mutually inconsistent problem of width.
The 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 modulation phase shifter of the present invention;
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 emulation array antenna layout of the present invention and emission angle hum pattern;
Fig. 9 is the angle spectral contrast schematic diagram of the present invention and conventional arrays antenna transmission signal.
Embodiment
With reference to Fig. 1, the present invention includes: 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.Wherein: M one-level modulation phase shifter 2 is connected between the input of the output of waveform generator 1 and 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 input of the output of upconverter 4 and 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 the antenna oscillator number.The structure of each parts is as follows:
Described waveform generator 1, adopt but be not limited to the device of 33219A model, and the signal of its output is the multichannel baseband digital signal, and it is 10 that this example is got port number, and this multichannel baseband digital signal is exported to one-level modulation phase shifter 2.As shown in Figure 2, wherein Fig. 2 (a) is the signal waveform that two edge gateways are exported with Fig. 2 (c) to the baseband digital signal waveform, the signal waveform of passage output centered by Fig. 2 (b).
With reference to Fig. 3, each one-level modulation phase shifter 2 comprises one-level logic module 21, one-level gating switch 22 and polymerization transport module 23;
This one-level logic module 21, its input is connected with the output of waveform generator 1, and this module is comprised of the first logical circuit C1 and the first transistor G1, and wherein the first logical circuit C1 adopts resistance, electric capacity, reactance to build; By controlling electric current and the voltage of the first logical circuit C1 output, make the first transistor G1 in conducting or off-state, produce phase Code code element p m(t), this phase Code has zero and lacks autocorrelation, and meets mutually orthogonal property, m=0,1,2 ... M-2, M-1, M is the antenna oscillator number;
This one-level gating switch 22, build and form by transistor seconds G2, 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, make transistor seconds G2 in conducting and off-state, be the open and close state of switch, modulated for the output signal to antenna oscillator 1, the signal after being modulated 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 polymerization transport module 23, its output is connected with digital to analog converter 3, this module is comprised of the second logical circuit C2 and the 3rd transistor G3, wherein the second logical circuit C2 adopts resistance, electric capacity, reactance to build, by controlling electric current and the voltage of the second logical circuit C2 output, make the 3rd transistor G3 in conducting or off-state, to realize the gating polymerization of multiple signals, aggregate signal S aggrfor:
Figure BDA0000392081900000041
the aggregate signal waveform as shown in Figure 5.
Described digital to analog converter 3, adopt but be not limited to the device of AD5755 model, and the output signal of frequency modulator 2 is processed by the decoding summation of digital to analog converter 3, obtains analog signal, and this signal outputs to upconverter 4.
Described upconverter 4, adopt but be not limited to the device of MAX2044 model, and 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, and the signal of upconverter 4 outputs is processed by the amplification of this low noise amplifier 5, obtains the amplifying signal that gains, and 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 comprised of the 3rd logical circuit C3 and the 4th transistor G4, and wherein the 3rd logical circuit C3 adopts resistance, electric capacity, reactance to build; By controlling electric current and the voltage of the 3rd logical circuit C3 output, make the 4th transistor G4 in conducting or off-state, produce phase Code code element q m(t), this phase Code has zero and lacks autocorrelation, and meets mutually orthogonal property, m=0,1,2 ... M-2, M-1, M is the antenna oscillator number;
This secondary gating switch 62, build and form by the 5th transistor G5, 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, make the 5th transistor G5 in conducting and off-state, be the open and close state of switch, for the output signal to low noise amplifier 5, carry out demodulation, obtain the multichannel baseband signal S after demodulation demodfor:
S demod＝{q 0·S digtal_aggr?q 1·S digtal_aggr?…?q m·S digtal_aggr?…?q M-1·S digtal_aggr}，
Wherein, S digtal_aggroutput signal for low noise amplifier 5, m=0,1,2 ... M-2, M-1, as shown in Figure 6, wherein Fig. 6 (a) and Fig. 6 (c) are the edge gateway signal waveform of secondary modulation phase shifter output to the multichannel baseband signal waveform of secondary modulation phase shifter 6 outputs, the edge gateway signal waveform that Fig. 6 (b) is the output of secondary modulation phase shifter.
With reference to Fig. 7, described antenna oscillator 7, be comprised of M the identical shaft-like hollow metal tube 71 of size, wherein, M >=2, this example is got M=10.The parallel equidistant arrangement of these metal tubes, be fixed on T-shaped support bar 72; The length L of each metal tube=k λ, wherein, λ is signal wavelength, and k is coefficient, and k=14 or k=12 all are 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 the clearing blocked is arranged, and the signal of telecommunication of secondary modulation phase shifter 6 outputs is converted to electromagnetic wave signal through sensor unit, and this signal is input to the port of metal tube and is launched.
Effect of the present invention can further be verified by following emulation.
1. experiment scene:
As shown in Figure 8, it is emulation array antenna layout of the present invention and emission angle hum pattern, and the position coordinates of antenna of the present invention and conventional arrays transmitting antenna is all (0,0) km, and array antenna is provided with 10 antenna oscillators; In simulating scenes the launching beam orientation angle be made as+45 °.
2. experiment content and result:
Obtain transmitting of diverse location by the antenna scanning spatial domain, this scan sector scope is-90 °～+ 90 °.Carry out wave beam formation with transmitting of conventional arrays transmitting antenna and these two kinds of antennas of the present invention respectively, obtain power azimuth spectrum figure, as shown in Figure 9, the power azimuth spectrum that wherein dotted line in Fig. 9 is the conventional arrays antenna, the solid line of Fig. 9 is power azimuth spectrum of the present invention.
Contrast by Fig. 9 dotted portion and Fig. 9 solid line part can be shown in: the present invention is under the situation of designs simplification, smaller volume, device minimizing, cost, the control that emission is pointed to can reach with the conventional arrays antenna same precisely, and can reach same beam resolution.

Claims (4)

1. the single channel array transmitting antenna based on phase Code modulation, comprising: 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 modulation phase shifter (2) between waveform generator (1) and digital to analog converter (3), produce one group of phase Code for the mode by phase shift, carry out bi-phase modulated with the signal to waveform generator (1) output, and the signal after modulation is carried out to positive crosslinking polymerization processing, wherein, M is the antenna oscillator number; .
Be connected with M secondary modulation phase shifter (6) between low noise amplifier (5) and antenna oscillator (7), for generation of phase Code, with the single channel signal to low noise amplifier (5) output, carry out demodulation process, obtain the multi-channel analog radiofrequency signal.
2. according to the described single channel array transmitting antenna based on the phase Code modulation of claims 1, it is characterized in that, each one-level modulation phase shifter (2) comprises one-level logic module (21), one-level gating switch (22) and polymerization transport module (23);
Described 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 m(t) be the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutually orthogonal property, m=0,1,2 ... M-2, M-1, M is the antenna oscillator number;
Described one-level gating switch (22), modulated for the output signal to waveform generator (1), and the signal after being modulated 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 polymerization transport module (23), carry out polymerization for the output signal to one-level gating switch (22), obtains aggregate signal S aggrfor: S aggr = Σ m = 0 M - 1 Γp m ( t ) ω m .
3. the single channel array transmitting antenna based on the phase Code modulation according to claim 1, is characterized in that each secondary modulation phase shifter (6) comprises two-level logic module (61) and secondary gating switch (62);
Described two-level logic module (61), for generation of phase Code code element qM, and control secondary gating switch (62) and signal carried out to demodulation, this q m={ q 0(t) ... q m(t) ... q m-2(t) q m-1(t) }, wherein, q m(t) be the phase Code of each passage, this phase Code has zero and lacks autocorrelation, and meets mutually orthogonal property, m=0,1,2 ... M-2, M-1, M is the antenna oscillator number;
Described secondary gating switch (62), carry out demodulation for the output signal to low noise amplifier (5), obtains the multichannel baseband signal S after demodulation demodfor:
S demod＝{q 0·S digtal_aggr?q 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.
4. the single channel array transmitting antenna based on phase Code modulation according to claim 1, it is characterized in that, described antenna oscillator (7), the structure that adopts M the identical metal, rod-shaped pipe of size to be arranged in parallel, the length L of each metal tube=k λ, equidistantly be fixed on T-shaped bracing frame, wherein, λ is signal wavelength, and k is coefficient, k=14 or k=12.
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN103779659A (en) * 2014-01-24 2014-05-07 西安电子科技大学 Single-channel array transmitting antenna based on frequency pre-coding
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
CN107329109A (en) * 2017-06-21 2017-11-07 中国电子科技集团公司第三十六研究所 The method of reseptance and device of a kind of array signal

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CN102130697A (en) * 2010-01-20 2011-07-20 华为技术有限公司 Receiver, transmitter and feedback device, transceiver and signal processing method
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CN103779659A (en) * 2014-01-24 2014-05-07 西安电子科技大学 Single-channel array transmitting antenna based on frequency pre-coding
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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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