CN108448252B - Large-bandwidth large-angle continuous scanning light-controlled phased array antenna receiving device and method - Google Patents
Large-bandwidth large-angle continuous scanning light-controlled phased array antenna receiving device and method Download PDFInfo
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- CN108448252B CN108448252B CN201810135558.9A CN201810135558A CN108448252B CN 108448252 B CN108448252 B CN 108448252B CN 201810135558 A CN201810135558 A CN 201810135558A CN 108448252 B CN108448252 B CN 108448252B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/2676—Optically controlled phased array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/2682—Time delay steered arrays
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Abstract
The invention discloses a receiving device and a receiving method for a large-bandwidth large-angle continuous scanning light-controlled phased array antenna, and belongs to the technical field of microwave photons. The device and the method adopt the cascade micro-ring working in anti-resonance to form a delay continuous regulation subunit, adopt the optical switch to switch the waveguides with different lengths to form a delay discrete regulation subunit, and the optical delay unit formed by combining the two subunits provides the required delay compensation for the microwave signal receiving of the phased array antenna with large bandwidth, large angle and continuous scanning. The photoelectric phase modulation is adopted to realize the photoelectric conversion of the microwave signal received by the antenna, thereby avoiding the use of a bias point control circuit and simplifying the system structure. The requirement on the bandwidth of the delay unit is reduced by adopting optical single-side band filtering, the common-mode noise is effectively reduced by adopting differential balanced photoelectric detection, and the performance of the system is improved.
Description
Technical Field
The invention belongs to the technical field of microwave photons, and relates to a receiving device and a receiving method for a large-bandwidth large-angle continuous scanning light-controlled phased array antenna.
Background
The light-operated phased array antenna can overcome the inherent aperture effect and the limitation of the transit time of the traditional phased array antenna based on the electric phase shifter, has remarkable advantages in the aspects of realizing large bandwidth and large angle scanning, and has wide application prospect in the fields of new generation wireless communication technology and the like. In practical applications, especially in the microwave signal receiving process, the optical phased array antenna should be able to receive signals without a spatial blind area in a larger receiving angle range, which requires that the optical delay unit in the optical phased array antenna can provide a sufficiently large delay compensation amount and continuously scan the delay amount.
In the prior art [1] (wang build, cai hai, hou bacon, wang book nan. a transceiver integrated broadband light-controlled phased array antenna based on micro-optical element stack integration technology, photonics, 2015, volume 44, phase 11, 1125002), a light-controlled phased array scheme based on micro-optical elements of prism groups is studied, and the scanning of a beam pointing angle is realized by adjusting the distance between adjacent prism groups to generate light delay. Although the scheme can realize quasi-continuous scanning of beams, the system is composed of a plurality of micro-optical element stacks, and the system is complex in structure, large in size and high in power consumption.
In the prior art [2] (leixue, yaoqing, liuyu, xue peak. the control technology of wavelength division multiplexing light-controlled phased array radar. radio engineering, 2015, volume 45, phase 4, pp.60-64), a light-controlled phased array scheme based on optical switch switching wavelength division multiplexing reflection optical path delay is researched, each array element corresponds to one wavelength of wavelength division multiplexing, each channel of wavelength division multiplexing adopts a delay line of a backsward mode, a Faraday rotary mirror is used as a reflector at the tail end of the channel delay line, and the lengths of optical fibers among wavelength division multiplexing channels are increased progressively according to an arithmetic progression. The scheme can only realize discrete scanning, and the number of required wavelengths and the number of wavelength division multiplexing channels are correspondingly increased along with the increase of the number of antenna array elements, thereby greatly increasing the complexity of the system.
In the prior art [3] (Lilin, Wupengshen, light-controlled phased array beam receiving network, modern radar, 2017, volume 39, phase 10, pp.72-75), a light-controlled phased array scheme based on an optical fiber dispersion delay mechanism is researched, and the delay of a multichannel microwave signal on an optical domain is realized by utilizing the dispersion effect of optical fibers on carriers with different wavelengths. By controlling the wavelength interval of the optical carrier, equal-interval time delay among multi-channel microwave signals can be obtained, and beam pointing is formed; the beam scanning is realized by switching different lengths of dispersive optical fibers through an optical switch. This scheme can only achieve discrete scanning, and as the number of antenna elements increases, the number of required wavelengths also increases, which greatly increases the complexity of the system.
Therefore, the above-mentioned light-controlled phased array receiving technical scheme has the disadvantages of complex structure, large volume and high power consumption, or has the limitations that only discrete scanning can be realized, and the extended application of a large-scale antenna array is difficult to realize.
Disclosure of Invention
The invention provides a receiving device and a receiving method for a large-bandwidth large-angle continuous scanning light-controlled phased array antenna, which effectively solve the problems that continuous scanning is difficult to realize, the structure is complex, large-scale antenna array expansion application is difficult to realize and the like in the background technology.
The technical scheme adopted by the invention for solving the problems is as follows:
the optically controlled phased array antenna receiving apparatus includes: the optical fiber laser comprises a single-wavelength laser source, an optical amplifier, a 1 x (M +1) optical power splitter, an electro-optical conversion unit, an optical delay unit, a 1 xN optical power combiner, a 1 xM optical power combiner, an optical sideband filter and a differential photoelectric detection unit.
The single-wavelength laser source, the optical amplifier, the 1 x (M +1) optical power splitter, the electro-optical conversion unit, the optical delay unit, the 1 xN optical power combiner, the 1 xM optical power combiner, the optical sideband filter and the differential photoelectric detection unit are sequentially connected through optical fibers or optical waveguides.
The microwave light modulation mode of the electro-optical conversion unit is electro-optical phase modulation.
The optical delay unit comprises a delay continuous regulation subunit and a delay discrete regulation subunit. The continuous delay regulation subunit is formed by connecting Q delay waveguide micro-rings in series, wherein Q is 1,2, 3. the0The continuous scanning function is delayed within the range. The time-delay discrete regulation subunit is formed by sequentially connecting 21 multiplied by 2 optical switches and P2 multiplied by 2 optical switches in series, and the time delay difference of the upper path and the lower path of the adjacent connected optical switches is 2P-1Δ τ, P · 1,2,3 ·, which is implemented at Δ τ · (2) ·P-1) time-delay scanning is carried out within the range of delta tau by step delta tau, a large time-delay scanning function is obtained, and delta tau is provided0≥Δτ。
The wavelength of the output light wave of the single-wavelength laser source is at the anti-resonance wavelength of the waveguide micro-ring of the delay continuous controllable subunit.
The optical delay units OTTD-11, OTTD-12 and OTTD-13 … … OTTD-1N realize the pitch angle scanning of the array element of the 1 st column, and the signals output by the optical delay units OTTD-11, OTTD-12 and OTTD-13 … … OTTD-1N are combined by a first 1 xN optical power combiner and then enter the optical delay unit OTTD-1; the optical delay units OTTD-21, OTTD-22 and OTTD-23 … … OTTD-2N realize the pitch angle scanning of the array element of the 2 nd row, and signals output by the optical delay units OTTD-21, OTTD-22 and OTTD-23 … … OTTD-2N are combined by a second 1 xN optical power combiner and then enter the optical delay unit OTTD-2; the optical delay units OTTD-31, OTTD-32 and OTTD-33 … … OTTD-3N realize the pitch angle scanning of the 3 rd array element, and the signals output by the optical delay units OTTD-31, OTTD-32 and OTTD-33 … … OTTD-3N are combined by a third 1 xN optical power combiner and then enter the optical delay unit OTTD-3; the optical delay units OTTD-M1, OTTD-M2 and OTTD-M3 … … OTTD-MN realize the pitch angle scanning of the M-th array element, and signals output by the optical delay units OTTD-M1, OTTD-M2 and OTTD-M3 … … OTTD-MN are combined by an M1 XN optical power combiner and then enter the optical delay unit OTTD-M;
the optical time delay units OTTD-1, OTTD-2 and OTTD-3 … … OTTD-M respectively realize the horizontal angle scanning of the array elements of the 1 st row, the array elements of the 2 nd row and the array elements of the 3 rd row … … M, and the signals output by the optical time delay units OTTD-1, OTTD-2 and OTTD-3 … … OTTD-M are combined by a 1 xM optical power combiner and enter an optical sideband filter;
the optical sideband filter selects one sideband, namely the left sideband or the right sideband, of the optical carrier microwave signal output by the optical power combiner;
the optical delay unit only provides delay compensation for the left side band or the right side band of the optical carrier microwave signal;
the differential photoelectric detection unit comprises a 2 multiplied by 2 optical coupling shunt subunit and a balanced photoelectric detection subunit, realizes the differential balanced photoelectric detection of the optical carrier microwave left side band or right side band and the optical carrier, and outputs a target microwave signal.
A receiving method of a large-bandwidth large-angle continuous scanning light-controlled phased array antenna comprises the following steps:
a single-wavelength laser source emitting at a frequency fCThe optical carriers enter a 1 x (M +1) optical power splitter after being subjected to power amplification by an optical amplifier, and the split 1 st branch, 2 nd branch and 3 rd branch … … th branch optical carriers are respectively transmitted to the electro-optical conversion units corresponding to the 1 st array element, the 2 nd array element, the 3 rd array element and the … … th array element; microwave signals received by each antenna array element in the MXN array antenna are modulated to an optical carrier f through an electro-optical conversion unitCThe modulation mode is electro-optical phase modulation, and an optical carrier microwave signal is output;
the optical delay units OTTD-11, OTTD-12, OTTD-13 and … … OTTD-1N realize the pitch angle scanning of the optical carrier microwave signals corresponding to the 1 st array element; the output N paths of optical carrier microwave signals are combined by a first 1 XN optical power combiner and enter an optical time delay unit OTTD-1; the optical time delay unit OTTD-1 realizes the horizontal angle scanning of the array element of the 1 st column;
the optical delay units OTTD-21, OTTD-22 and OTTD-23 … … OTTD-2N realize the pitch angle scanning of the optical carrier microwave signals corresponding to the 2 nd array element; the output N paths of optical carrier microwave signals are combined by a second 1 XN optical power combiner and enter an optical time delay unit OTTD-2; the optical time delay unit OTTD-2 realizes the horizontal angle scanning of the 2 nd array element;
the optical delay units OTTD-31, OTTD-32 and OTTD-33 … … OTTD-3N realize the pitch angle scanning of the optical carrier microwave signals corresponding to the 3 rd array element; the output N paths of optical carrier microwave signals are combined by a third 1 XN optical power combiner and enter an optical time delay unit OTTD-3; the optical time delay unit OTTD-3 realizes the horizontal angle scanning of the 3 rd array element;
……
the optical delay units OTTD-M1, OTTD-M2 and OTTD-M3 … … OTTD-MN realize the pitch angle scanning of the optical carrier microwave signals corresponding to the M array element; the output N paths of optical carrier microwave signals enter an optical time delay unit OTTD-M through the combination of an M1 XN optical power combiner; the optical delay unit OTTD-M realizes the horizontal angle scanning of the M-th array element;
m-path optical carrier microwave signals output by optical delay units OTTD-1, OTTD-2 and OTTD-3 … … OTTD-M are converted into 1The combined M optical power combiner enters an optical sideband filter which passes through the left sideband f of the optical carrier microwave signalC-fRFOr the right side band fC+fRF；
Optical carrier microwave single sideband signal f output by optical sideband filterC-fRFOr fC+fRFAnd (M +1) th branch optical carrier f after being split by 1 (M +1) optical power splitterCEntering a differential photoelectric detection unit; 2 x 2 optical coupling and branching device in differential photoelectric detection unit for optical carrier microwave single sideband signal fC-fRFOr fC+fRFAnd an optical carrier fCCoupling and shunting are carried out, and then the light enters two light input ports of the balanced photoelectric detector respectively; the photoelectric detector 1 and the photoelectric detector 2 in the balanced photoelectric detector respectively carry out differential photoelectric conversion, the generated microwave signals are subtracted by a circuit to eliminate common-mode noise, and finally, target microwave signals are output;
the time delay discrete regulation subunit in the optical time delay unit is between delta tau and (2)P-1) carrying out time-delay scanning with step length delta tau within the range of delta tau, wherein the time-delay continuous regulation subunit is between 0 and delta tau0Continuous delay scanning is carried out in the range, pitching angle scanning and horizontal angle scanning of the array elements of the MXN array antenna are carried out through the adjusting and controlling optical delay units, and the microwave signal receiving function of large-bandwidth, large-angle and continuous scanning is realized.
The invention has the beneficial effects that:
(1) according to the receiving device and the method for the large-bandwidth large-angle continuous scanning light-controlled phased array antenna, the delay continuous regulation and control subunit is formed by the cascade micro-rings working in an anti-resonance state, and can provide the functions of large bandwidth, low loss and delay continuous scanning; the delay discrete regulation subunit is formed by switching waveguides with different lengths by an optical switch, and can provide large total delay; the optical delay unit formed by combining the two can realize the microwave signal receiving function of large bandwidth, large angle and continuous scanning.
(2) The receiving device and the method for the large-bandwidth large-angle continuous scanning light-controlled phased array antenna realize photoelectric conversion of microwave signals received by the antenna by adopting electro-optic phase modulation, avoid a bias point control circuit which is necessary for a common Mach-Zehnder electro-optic intensity modulator, simplify the system structure and have more outstanding simplification advantages for a large-scale light-controlled phased array antenna system.
(3) The invention relates to a receiving device and a method for a large-bandwidth large-angle continuous scanning light-controlled phased array antenna, wherein an optical sideband filter is adopted to gate one sideband of a microwave light modulation signal, and a delay unit only needs to provide delay compensation for the sideband, thereby reducing the requirement on the bandwidth of the delay unit; the microwave signal recovery is carried out by adopting differential balanced photoelectric detection, so that the common-mode noise can be effectively reduced, and the performance of the system is improved.
Drawings
Fig. 1 is a block diagram of a large bandwidth, large angle, continuous scanning, optically controlled phased array antenna receiving device of the present invention.
Fig. 2 is a block diagram of an optical delay unit structure.
Fig. 3 is a block diagram of a differential photodetection unit structure.
Fig. 4(a) is a schematic diagram of the spectrum of an optically-carried microwave signal before entering an optical sideband filter.
Fig. 4(b) is a graph of the filter response of the optical sideband filter versus the optical carrier microwave spectrum.
Fig. 4(c) is a schematic diagram of the spectrum of an optical microwave-bearing signal after an optical sideband filter.
Fig. 5 is a schematic diagram of symbols in the figure.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The light-operated phased array antenna receiving device and the method have the function of providing large bandwidth, large angle and continuous scanning for receiving microwave signals of the MxN antenna array.
Fig. 1 is a block diagram of a receiving device of a large-bandwidth large-angle continuous scanning optically controlled phased array antenna. The optically controlled phased array antenna receiving apparatus includes: the optical fiber/optical waveguide hybrid optical fiber array comprises a single-wavelength laser source, an optical amplifier, a 1 x (M +1) optical power splitter, an electro-optical conversion unit, an optical delay unit, a 1 xN optical power combiner, a 1 xM optical power combiner, an optical sideband filter and a differential photoelectric detection unit which are sequentially connected through an optical fiber or an optical waveguide.
The microwave light modulation mode of the electro-optical conversion unit is electro-optical phase modulation. EOM-11, EOM-12, EOM-13, EOM-1N in FIG. 1 are electro-optical modulation units respectively corresponding to the 1 st array element; EOM-21, EOM-22, EOM-23, EOM-2N are electro-optical modulation units respectively corresponding to the 2 nd array element; EOM-31, EOM-32, EOM-33, EOM-3N are electro-optical modulation units respectively corresponding to the 3 rd array element; the M array elements are respectively corresponding electro-optical modulation units, EOM-M1, EOM-M2, EOM 3, and EOM-MN.
In FIG. 1, OTTD-11, OTTD-12, OTTD-13, OTTD-1N are optical delay units corresponding to the array element 1 respectively; OTTD-21, OTTD-22, OTTD-23, OTTD-2N is the light delay unit corresponding to the 2 nd array element; OTTD-31, OTTD-32, OTTD-33, OTTD-1N is the optical delay unit corresponding to the 3 rd array element; the array elements are optical delay units respectively corresponding to the M array elements, OTTD-M1, OTTD-M2, OTTD-M3, and OTTD-MN. The optical delay unit array provides delay compensation for the pitching scanning of the antenna beam, and is called as a pitching scanning optical delay unit array.
In fig. 1, OTTD-2, OTTD-3, OTTD-M are the optical delay units corresponding to the antenna elements in column 1, column 2, column 3, and column M, respectively. The optical delay unit array provides delay compensation for horizontal scanning of antenna beams, and is called as a horizontal scanning optical delay unit array.
Fig. 2 is a block diagram of the structure of an optical delay unit, which includes a delay continuous regulation subunit and a delay discrete regulation subunit. The continuous delay regulating subunit is formed by connecting Q delay waveguide micro-rings in series, wherein Q is 1,2,3, and is realized at 0-delta tau0The continuous scanning function is delayed within the range. The time-delay discrete regulation subunit is formed by sequentially connecting 21 multiplied by 2 optical switches and P2 multiplied by 2 optical switches in series, and the time delay difference of the upper path and the lower path of the adjacent connected optical switches is 2P-1Δ τ, P ═ 1,2,3,. cndot. realized at Δ τ to (2)P-1)ΔτAnd time delay scanning is carried out within the range by step length delta tau, and a large time delay scanning function is obtained. And has a value of0≥Δτ。
Fig. 3 is a structural block diagram of the photoelectric detection splitting unit, which includes a 2 × 2 optical coupling branching subunit and a balanced photoelectric detection subunit.
A single-wavelength laser source emitting at a frequency fCThe optical carrier wave enters a 1 x (M +1) optical power splitter after being subjected to power amplification by an optical amplifier, and the optical carrier waves of the 1 st branch, the 2 nd branch, the 3 rd branch and … … of the split optical carrier wave and the M th branch are respectively transmitted to the electro-optical conversion units corresponding to the 1 st array element, the 2 nd array element, the 3 rd array element, … … and the M th array element. Microwave signals received by each antenna array element in the MXN array antenna are modulated to an optical carrier f through an electro-optical conversion unitCThe modulation mode is electro-optical phase modulation, and outputs an optical carrier microwave signal.
The optical carrier microwave signal enters the pitching scanning optical delay unit array, and the optical delay unit array provides delay compensation for receiving the microwave signal with a large angle in the pitching direction. The optical carrier microwave signals output by the pitching scanning optical delay unit array respectively enter a horizontal scanning optical delay unit array (OTTD-1, OTTD-2, OTTD-3, … …, OTTD-M) through a 1 xN optical power combiner, and the optical delay unit array provides delay compensation for receiving the microwave signals with large angles in the horizontal direction.
The optical carrier microwave signals output by the horizontal scanning optical delay unit array enter an optical sideband filter after being combined by a 1 xM optical power combiner.
Fig. 4 is a spectral diagram of an optical sideband filter filtering process. FIG. 4(a) is a schematic diagram of the spectrum of an optically-carried microwave signal prior to entering an optical sideband filter; FIG. 4(b) is a plot of the filter response of an optical sideband filter versus the optical carrier microwave spectrum; fig. 4(c) is a schematic diagram of the spectrum of an optical microwave-bearing signal after an optical sideband filter. It can be seen that the optical sideband filter gates the left sideband f of the optical microwave-carrying signalC-fRF。
Optical carrier microwave single sideband signal f output by optical sideband filterC-fRFAnd (M +1) th branch optical carrier after being split by 1 (M +1) optical power splitterfCAnd entering a differential photoelectric detection unit. 2 x 2 optical coupler in differential photoelectric detection unit for optical carrier microwave single sideband signal fC-fRFAnd an optical carrier fCCoupling and shunting are carried out, and then the light enters two light input ports of the balanced photoelectric detector respectively; and a photoelectric detector 1 and a photoelectric detector 2 in the balanced photoelectric detector respectively perform differential photoelectric conversion, the generated microwave signals are subtracted by a circuit to eliminate common-mode noise, and finally, target microwave signals are output.
The time delay discrete regulation subunit in the optical time delay unit is between delta tau and (2)P-1) carrying out time-delay scanning with step length delta tau within the range of delta tau, wherein the time-delay continuous regulation subunit is between 0 and delta tau0Continuous delay scanning is carried out in the range, pitching angle scanning and horizontal angle scanning of the array elements of the MXN array antenna are carried out through the adjusting and controlling optical delay units, and the microwave signal receiving function of large-bandwidth, large-angle and continuous scanning is realized.
Claims (2)
1. A large bandwidth, large angle, continuous scanning, optically controlled phased array antenna receiving device, comprising: the optical fiber laser comprises a single-wavelength laser source, an optical amplifier, a 1 x (M +1) optical power splitter, an electro-optical conversion unit, an optical delay unit, a 1 xN optical power combiner, a 1 xM optical power combiner, an optical sideband filter and a differential photoelectric detection unit;
the single-wavelength laser source, the optical amplifier, the 1 x (M +1) optical power splitter, the electro-optical conversion unit, the optical delay unit, the 1 xN optical power combiner, the 1 xM optical power combiner, the optical sideband filter and the differential photoelectric detection unit are sequentially connected through optical fibers or optical waveguides;
the microwave light modulation mode of the electro-optical conversion unit is electro-optical phase modulation;
the optical delay unit comprises a delay continuous regulation subunit and a delay discrete regulation subunit; the continuous delay regulation subunit is formed by connecting Q delay waveguide micro-rings in series, wherein Q is 1,2, 3. the0Time delay within rangeA continuous scanning function; the time-delay discrete regulation subunit is formed by sequentially connecting 21 multiplied by 2 optical switches and P2 multiplied by 2 optical switches in series, and the time delay difference of the upper path and the lower path of the adjacent connected optical switches is 2P-1Δ τ, P · 1,2,3 ·, which is implemented at Δ τ · (2) ·P-1) carrying out time-delay scanning with step length delta tau within the range of delta tau to obtain a large time-delay scanning function; and has a value of0≥Δτ；
The wavelength of the output light wave of the single-wavelength laser source is at the anti-resonance wavelength of the waveguide micro-ring of the delay continuous controllable subunit;
the optical delay units OTTD-11, OTTD-12 and OTTD-13 … … OTTD-1N realize the pitch angle scanning of the array element of the 1 st column, and the signals output by the optical delay units OTTD-11, OTTD-12 and OTTD-13 … … OTTD-1N are combined by a first 1 xN optical power combiner and then enter the optical delay unit OTTD-1; the optical delay units OTTD-21, OTTD-22, OTTD-23, … … and OTTD-2N realize the pitch angle scanning of the array element of the 2 nd row, and signals output by the optical delay units OTTD-21, OTTD-22, OTTD-23, … … and OTTD-2N are combined by a second 1 xN optical power combiner and then enter the optical delay unit OTTD-2; the optical delay units OTTD-31, OTTD-32, OTTD-33, … … and OTTD-3N realize the pitch angle scanning of the 3 rd array element, and signals output by the optical delay units OTTD-31, OTTD-32, OTTD-33, … … and OTTD-3N are combined by a third 1 xN optical power combiner and then enter the optical delay unit OTTD-3; the optical delay units OTTD-M1, OTTD-M2 and OTTD-M3 … … OTTD-MN realize the pitch angle scanning of the M-th array element, and signals output by the optical delay units OTTD-M1, OTTD-M2 and OTTD-M3 … … OTTD-MN are combined by an M1 XN optical power combiner and then enter the optical delay unit OTTD-M;
the optical time delay units OTTD-1, OTTD-2 and OTTD-3 … … OTTD-M respectively realize the horizontal angle scanning of the array elements of the 1 st row, the array elements of the 2 nd row and the array elements of the 3 rd row … … M, and the signals output by the optical time delay units OTTD-1, OTTD-2 and OTTD-3 … … OTTD-M are combined by a 1 xM optical power combiner and enter an optical sideband filter;
the optical sideband filter selects one sideband, namely the left sideband or the right sideband, of the optical carrier microwave signal output by the optical power combiner;
the optical delay unit only provides delay compensation for the left side band or the right side band of the optical carrier microwave signal;
the differential photoelectric detection unit comprises a 2 multiplied by 2 optical coupling shunt subunit and a balanced photoelectric detection subunit, realizes the differential balanced photoelectric detection of the optical carrier microwave left side band or right side band and the optical carrier, and outputs a target microwave signal.
2. A receiving method of a large-bandwidth large-angle continuous scanning optically controlled phased array antenna, which adopts the receiving device of the optically controlled phased array antenna of claim 1; the method is characterized by comprising the following steps:
a single-wavelength laser source emitting at a frequency fCThe optical carriers enter a 1 x (M +1) optical power splitter after being subjected to power amplification by an optical amplifier, and the split optical carriers of the 1 st branch, the 2 nd branch and the 3 rd branch … … th branch are respectively transmitted to the electro-optical conversion units corresponding to the 1 st array element, the 2 nd array element and the 3 rd array element … … th array element; microwave signals received by each antenna array element in the MXN array antenna are modulated to an optical carrier f through an electro-optical conversion unitCThe modulation mode is electro-optical phase modulation, and an optical carrier microwave signal is output;
the optical delay units OTTD-11, OTTD-12 and OTTD-13 … … OTTD-1N realize the pitch angle scanning of the optical carrier microwave signals corresponding to the 1 st array element; the output N paths of optical carrier microwave signals are combined by a first 1 XN optical power combiner and enter an optical time delay unit OTTD-1; the optical time delay unit OTTD-1 realizes the horizontal angle scanning of the array element of the 1 st column;
the optical delay units OTTD-21, OTTD-22 and OTTD-23 … … OTTD-2N realize the pitch angle scanning of the optical carrier microwave signals corresponding to the 2 nd array element; the output N paths of optical carrier microwave signals are combined by a second 1 XN optical power combiner and enter an optical time delay unit OTTD-2; the optical time delay unit OTTD-2 realizes the horizontal angle scanning of the 2 nd array element;
the optical delay units OTTD-31, OTTD-32 and OTTD-33 … … OTTD-3N realize the pitch angle scanning of the optical carrier microwave signals corresponding to the 3 rd array element; the output N paths of optical carrier microwave signals are combined by a third 1 XN optical power combiner and enter an optical time delay unit OTTD-3; the optical time delay unit OTTD-3 realizes the horizontal angle scanning of the 3 rd array element;
……
the optical delay units OTTD-M1, OTTD-M2 and OTTD-M3 … … OTTD-MN realize the pitch angle scanning of the optical carrier microwave signals corresponding to the M array element; the output N paths of optical carrier microwave signals enter an optical time delay unit OTTD-M through the combination of an M1 XN optical power combiner; the optical delay unit OTTD-M realizes the horizontal angle scanning of the M-th array element;
m paths of optical carrier microwave signals output by the optical delay units OTTD-1, OTTD-2 and OTTD-3 … … OTTD-M are combined by a 1 xM optical power combiner and enter an optical sideband filter, and the optical sideband filter is used for passing a left side band f of the optical carrier microwave signalsC-fRFOr the right side band fC+fRF；
Optical carrier microwave single sideband signal f output by optical sideband filterC-fRFOr fC+fRFAnd (M +1) th branch optical carrier f after being split by 1 (M +1) optical power splitterCEntering a differential photoelectric detection unit; 2 x 2 optical coupling and branching device in differential photoelectric detection unit for optical carrier microwave single sideband signal fC-fRFOr fC+fRFAnd an optical carrier fCCoupling and shunting are carried out, and then the light enters two light input ports of the balanced photoelectric detector respectively; the photoelectric detector 1 and the photoelectric detector 2 in the balanced photoelectric detector respectively carry out differential photoelectric conversion, the generated microwave signals are subtracted by a circuit to eliminate common-mode noise, and finally, target microwave signals are output;
the time delay discrete regulation subunit in the optical time delay unit is between delta tau and (2)P-1) carrying out time-delay scanning with step length delta tau within the range of delta tau, wherein the time-delay continuous regulation subunit is between 0 and delta tau0Continuous delay scanning is carried out in the range, pitching angle scanning and horizontal angle scanning of the array elements of the MXN array antenna are carried out through the adjusting and controlling optical delay units, and the microwave signal receiving function of large-bandwidth, large-angle and continuous scanning is realized.
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| CN109269986B (en) * | 2018-09-28 | 2021-12-24 | 东南大学 | Phased array laser ultrasonic detection system |
| CN109616777B (en) * | 2018-12-28 | 2021-01-22 | 西安电子科技大学 | Random mode vortex electromagnetic wave generation method based on time modulation array |
| CN111948633B (en) * | 2020-06-29 | 2022-11-29 | 北京理工大学 | Flexible ultra-wideband digital microwave photon phased array radar |
| CN113093153B (en) * | 2021-04-12 | 2022-12-30 | 中国科学院半导体研究所 | Receiving and transmitting integrated beam forming network system based on dispersion delay |
| CN113571908B (en) * | 2021-07-14 | 2024-05-07 | 北京无线电测量研究所 | Two-dimensional reconfigurable light-operated beam forming network device shared by transceiver |
| CN115167610B (en) * | 2022-09-08 | 2023-01-03 | 之江实验室 | Two-dimensional photon convolution acceleration chip and application system and method |
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