Optical-electrical hybrid multi-beam high-speed data receiving device and method

Abstract

The present invention discloses an optoelectronic hybrid multi-beam high-speed data receiving device and method, the device includes an antenna array, a radio frequency receiving component, an optically controlled beam forming network, and an integrated signal processing module; the antenna array is used to receive electromagnetic waves radiated by an aircraft in space and convert them into multiple independent radio frequency signals; the radio frequency receiving component is used to transmit a number of sub-array-level radio frequency beam signals to the optically controlled beam forming network; the optically controlled beam forming network is used to form a number of optical domain beam signals, and transmit the number of optical domain beam signals to the integrated signal processing module; the integrated signal processing module is used to perform analog-to-digital conversion on the target radio frequency beam signal to obtain a digital beam signal, demodulate the digital beam signal, and finally obtain a number of high-speed digital transmission data, and send it to a monitoring subsystem. The present invention can achieve large working bandwidth, high integration, high reliability, and strong expansibility.

Description

Technical Field

[0001] The present invention relates to the field of spacecraft measurement and control technology and satellite application technology, and in particular to an optoelectronic hybrid multi-beam high-speed data receiving device and method. Background Art

[0002] With the rapid development of my country's aerospace technology and second-generation navigation systems, the number of in-orbit land remote sensing satellites, ocean remote sensing satellites, communication satellites, navigation satellites and other low-orbit spacecraft will grow rapidly in the next decade. According to my country's aerospace development plan, it is estimated that by 2020, the number of in-orbit satellites will reach about 150, and the required operating frequency and bandwidth will also increase accordingly. It is inevitable to establish a ground system that can adapt to broadband and simultaneous multi-target reception.

[0003] The US AFSCN has carried out the GDPAA-ATD multi-target measurement and control project. The antenna is a six-sided electronically scanned phased array antenna with a receiving frequency band of 2.2-2.3GHz. It uses a digital beamforming system and can form four beams. The transceiver components all use an active phased array system, and the phase control is completed by a 4-bit phase shifter. The system has low working bandwidth and a small number of beams, resulting in weak data transmission capabilities and insufficient support for multi-target reception. In addition, the system uses a digital beamforming system, which is complex and consumes a lot of power. A separate power station needs to be built for the cooling system. The overall economic feasibility is poor and it is difficult to adapt to the development of high-frequency band systems such as Ka in the future.

[0004] Based on the concept of grid spherical phased array antenna proposed by the United States, the European Space Agency proposed a 5-meter diameter grid spherical phased array antenna (GEODA) in 2007. The beam forming is completed in the electrical domain, the reception adopts dual circular polarization, and the 1.7GHz S band is used. It can communicate with multiple satellites at a time. Its design features are the same as those of the US AFSCN, and it also faces the same problems, namely poor economic feasibility, inability to process broadband signals, and weak reception capability.

[0005] Judging from the research results and actual projects at home and abroad, the directional pattern of the antenna scheme using subarray multi-beam forming is only limited by the subarray, and the instantaneous bandwidth depends only on the aperture of the subarray. The structure of subarray delay plus unit phase shift not only reduces the cost and complexity of the array, but more importantly, it can partially offset the aperture transit time, thereby obtaining a wider instantaneous signal bandwidth. When the delay value of each delay line unit is changed, beam scanning can be completed, which not only solves the problem of limited instantaneous bandwidth of the array, but also completes the antenna beam scanning. However, the current phased array system uses an electrical delay method, which is usually implemented by metal waveguides or coaxial cables. These delay devices usually have large losses, large volumes, large weights, and narrow bandwidths. There will also be large electromagnetic interference, coupling, and radiation. Obviously, this method is difficult to be practical in large multi-target phased array systems.

[0006] The most likely solution to this problem and a technological breakthrough for the traditional large-scale electronically scanned phased array antenna system in large airspace will be the photon technology with semiconductor lasers, integrated optics, and fiber optic technology as the core, which is developing extremely rapidly today. Through OTTD (optical true time delay) technology and optical beamforming network, the beam tilt problem can be solved, large instantaneous bandwidth working capability and other superior performance can be obtained, and high-speed data reception in the entire airspace, multi-beam and large bandwidth can be achieved. It is easy to directly adopt optical signal processing methods and has strong anti-electromagnetic interference capabilities. However, due to the severe technical blockade of my country by foreign countries in the field of aerospace applications, in order to break the blockade of foreign countries on broadband optical control beamforming multi-target receiving technology and realize independent guarantee of key technologies, it is urgent and imperative to develop an optoelectronic hybrid multi-beam high-speed data receiving device. Summary of the invention

[0007] In view of the problem that the existing large-scale fully electrically controlled beamforming multi-target receiving system is limited by the array aperture transit time, can only work under a relatively narrow signal bandwidth, has a limited electronic scanning angle, and cannot achieve full spatial coverage, the present invention provides an optoelectronic hybrid multi-beam high-speed data receiving device and method to solve the above technical problems.

[0008] The present invention discloses an optoelectronic hybrid multi-beam high-speed data receiving device, which includes an antenna array, a radio frequency receiving component, an optically controlled beam forming network, and a comprehensive signal processing module;

[0009] The antenna array is divided into a plurality of sub-arrays, each of which includes a plurality of array elements, which are used to receive electromagnetic waves radiated by the aircraft in space and convert them into multiple independent radio frequency signals;

[0010] The RF receiving component is connected to the antenna array surface, and is used to receive the multiple independent RF signals, and amplify, power divide, and phase shift each received RF signal to form an array element-level beam signal, add a plurality of array element-level beam signals in units of a plurality of sub-arrays to obtain a plurality of sub-array-level RF beam signals, and transmit the plurality of sub-array-level RF beam signals to the optically controlled beam forming network;

[0011] The optical control beam forming network is used to perform delay, phase shift, signal distribution and superposition on a plurality of sub-array-level RF beam signals through electro-optical conversion in the optical domain to form a plurality of optical domain beam signals, and transmit the plurality of optical domain beam signals to the integrated signal processing module;

[0012] The integrated signal processing module is interconnected with the optical control beam forming network, and is used to form a number of corresponding target radio frequency beam signals after photoelectric conversion of the received multiple optical domain beam signals, convert the target radio frequency beam signals into digital beam signals by analog-to-digital conversion, demodulate the digital beam signals, and finally obtain multiple high-speed digital transmission data, and send them to the monitoring subsystem.

[0013] Furthermore, it also includes:

[0014] A beam control module, used to calculate the angle information of the aircraft, and also used to send a control command to the RF receiving component and the optical control beam forming network, the control command including the pointing information of multiple beams formed simultaneously, so that the formed sub-array-level beam signal and the optical beam signal point to the angle of the aircraft in real time;

[0015] The monitoring subsystem is interconnected with the RF receiving component, optical beam forming network, beam control module, and integrated signal processing module through a Gigabit network interface, and is used to collect monitoring information of the equipment and is responsible for storing multiple high-speed digital transmission data output by the integrated signal processing module.

[0016] Furthermore, the monitoring subsystem is composed of a monitoring computer and a recording device; wherein the monitoring computer is used to complete the unified real-time monitoring and control of the RF receiving component, the optical control beam forming network, the beam control module, and the integrated signal processing module; the recording device is used to complete the storage and playback tasks of multiple high-speed data transmission data, and supports the management and maintenance of the stored data;

[0017] The recording device is composed of a field programmable gate array FPGA, a NAND FLASH solid-state storage array and a multi-port storage control unit. The field programmable gate array FPGA is used to receive multiple high-speed digital transmission data from the integrated signal processing module, and realize ECC encoding and decoding, equalization algorithm, and bad block removal functions through the data preprocessing unit. Under the control of the multi-port storage control unit, the multiple high-speed digital transmission data are stored in the NAND FLASH solid-state storage array to complete the recording operation of multiple high-speed digital transmission data.

[0018] Furthermore, the antenna array surface is composed of a plurality of triangular sub-arrays, each of which is composed of a plurality of antenna array elements, each of which covers a receiving frequency and is used to receive electromagnetic waves radiated from space and convert them into high-frequency electrical signals;

[0019] The triangular subarray is connected to the RF receiving component via an SMA blind-plug connector to form an integrated common subarray front-end unit, which can be expanded and spliced ​​to construct a scalable full-space evolved conformal phased array.

[0020] Furthermore, the RF receiving component adopts a chip-based and MMCM integration route, which is divided into three unit circuit cascades, with the top layer being a low noise amplifier, the middle layer being a multi-beam forming network, and the bottom layer being a beam control unit;

[0021] The RF receiving component is blindly connected to the antenna array surface through an SMA connector, and is used to preprocess the signal received by each antenna array element, and send the multiple sub-array microwave signals formed after the preprocessing into the optical beamforming network; wherein the preprocessing includes low-noise amplification, phase shifting, and combining.

[0022] The circuit distribution of the RF receiving component is triangular. A single triangular antenna subarray contains 55 array element input links. Each triangular antenna subarray input link is connected to a 1:16 power divider. The RF receiving component uses 6 groups of The frequency beamforming network realizes phase control of 5280 links and outputs them to the subsequent processing circuit. After the electrical domain beamforming processing, each triangular antenna subarray outputs 16 subarray-level RF beams, and a total of 96 subarray-level RF beams are output to the optical control beamforming network for subsequent optical domain beamforming processing.

[0023] Furthermore, the optically controlled beamforming network is used to transform the subarray-level RF beam signal through optoelectronic conversion, and then the optical delay phase shifting beamforming network completes the delay phase shifting and signal distribution / superposition of the microwave signal in the optical domain to form multiple optical domain beam signals to achieve spatial beam scanning.

[0024] The present invention also provides an optoelectronic hybrid multi-beam high-speed data receiving method, which comprises:

[0025] S1: The target aircraft sends a downlink RF signal;

[0026] S2: The antenna array and RF receiving components receive the downlink RF signal of the target aircraft, amplify and phase-shift the downlink RF signal, and then send the sub-array-level RF beam signal to the optical control beam forming network;

[0027] S3: The optical control beam forming network receives the sub-array-level RF beam signal, processes it and completes the optical domain beam forming, generates the target RF beam signal after photoelectric conversion of multiple optical domain beam signals, and sends the target RF beam signal to the integrated signal processing module for demodulation;

[0028] S4: The integrated signal processing module receives the target RF beam signal sent by the optical control beam forming network, performs analog-to-digital conversion to form a digital beam signal, processes the digital beam signal to generate an information stream, and sends the information stream and the optical domain beam signal to the recording device in the monitoring subsystem for recording; detects and counts the high-speed data reception success rate information, and reports it to the monitoring subsystem;

[0029] S5: The monitoring subsystem receives and displays the high-speed data reception success rate information sent by the integrated signal processing module, detects the equipment status of the RF receiving component, the optical control beam forming network, the beam control module, and the integrated signal processing module, and diagnoses the data reception health status and task execution status in combination with the statistical results of the high-speed digital transmission data sent by the integrated signal processing module.

[0030] Further, the S4 includes:

[0031] The integrated signal processing module receives the target RF beam signal sent by the optical control beam forming network, performs analog-to-digital conversion to form a digital beam signal, and demodulates the digital beam signal to generate an information stream; the demodulation process includes a receiving demodulation step and a data processing step, the receiving demodulation step recovers the baseband data from the input digital beam signal through digital down-conversion, symbol synchronization, carrier synchronization and channel equalization processing, and the data processing step recovers the transmitted information stream after decoding, descrambling and frame synchronization processing on the demodulated baseband data; the information stream and the optical domain beam signal are sent to the recording device in the monitoring subsystem for recording; the monitoring subsystem detects the consistency of the transmitted and received information streams by comparison, counts the high-speed data reception success rate information, and reports it to the monitoring subsystem.

[0032] Further, the S5 includes:

[0033] The monitoring subsystem receives the high-speed data reception success rate information sent by the integrated signal processing module and displays it, and detects the equipment status of the RF receiving component, the optical control beam forming network, the beam control module, and the integrated signal processing module. The equipment status parameters include current, voltage, temperature, and functional abnormality indication information. Combined with the high-speed data transmission statistical results sent by the integrated signal processing module, if the bit error rate of the high-speed data transmission statistical results is greater than 1E-9, data reception is terminated, and the parameters in the equipment status parameters are queried for abnormalities. The data reception health status and task execution status are diagnosed. If the bit error rate of the high-speed data transmission statistical results is less than 1E-9, the task continues to be executed normally.

[0034] Furthermore, each independent optical beam forming network can receive 16 subarray-level radio frequency beam signals; the optical beam forming network receives 6 groups of 96 subarray-level radio frequency beam signals in total; the subarray-level radio frequency beam signals are fed to the electro-optical modulator, and each independent optical beam forming network modulates the corresponding 6 subarray-level radio frequency beam signals in different optical wavelengths to obtain 16 subarray-level primary optical beam signals; the 16 independent optical beam forming networks respectively perform multi-byte delay adjustment and amplitude weighted control on each subarray-level primary optical beam signal through an optical waveguide and an optical power regulator to obtain a subarray-level delayed optical beam signal, and then the 6 independent optical beam forming networks add the subarray-level delayed optical beam signals with the same number M value in each subarray-level delayed optical beam signal in the 6 subarrays through 16 optical power synthesizers to form 16 optical domain beam signals, and each optical domain beam signal corresponds to the radio frequency signals of all subarrays of 16 optical wavelengths at the same time, that is, to achieve independent synthesis of 16 beams.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1) Use optical fiber delay lines instead of electrical delay lines to perform delay processing in the optical domain, which is immune to the problem of electromagnetic interference in traditional methods, and is convenient for phase and amplitude compensation and fast signal processing, which is beneficial to suppress side lobes and realize fast scanning of beams, thereby improving system performance;

[0037] 2) Adopting optically controlled beamforming technology, making full use of the characteristics of strong optical processing broadband capability and low power consumption, it solves the problems of high resource consumption of beamforming in the electrical domain, limited by array time dispersion and spatial dispersion, and can only work in a relatively narrow signal bandwidth, with limited electrical scanning angle, and unable to achieve full spatial coverage. It can effectively improve the system working bandwidth and working frequency band, reduce front-end and back-end processing, and thus reduce the number of equipment, improve system performance, and increase economic feasibility;

[0038] 3) Adopting an integrated common subarray front-end unit, the antenna array surface is designed to be integrated with the receiving component in the form of a subarray. Traditional large-scale phased arrays face the problem of small element size and large working bandwidth. Simply performing beam synthesis on each element is no longer applicable. The present invention decomposes the complex large-scale conformal array into an integrated common subarray front-end unit that can cover the entire airspace, reducing the difficulty of implementing large-scale array engineering and having obvious advantages. At the same time, the subarray structure proposed in the present invention can be spliced ​​in the entire airspace evolution, which can not only cover the entire airspace, but also has the advantages of stable antenna gain under different pointing directions and high single-beam aperture utilization. These designs are relatively blank work in the current domestic optically controlled phased array and traditional measurement and control fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1This is a block diagram of the architecture of an optoelectronic hybrid multi-beam high-speed data receiving device;

[0040] Figure 2 This is the block diagram of the RF receiving component;

[0041] Figure 3 A block diagram of the optical beamforming network;

[0042] Figure 4 It is the block diagram of the integrated signal processing module;

[0043] Figure 5(a) is a schematic diagram of the triangular antenna subarray structure;

[0044] FIG5(b) is a schematic diagram of a hexagonal sub-array structure that can be expanded and composed on the same plane as FIG5(a);

[0045] Figure 6 The figure is a flowchart of the working process of an optoelectronic hybrid multi-beam high-speed data receiving device. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention. The present invention is further described below in conjunction with the accompanying drawings.

[0047] See also Figure 1, an optoelectronic hybrid multi-beam high-speed data receiving device: it adopts a hemispherical + cylindrical antenna structure to cover the entire airspace. After receiving each antenna array element, it realizes 16 independent beam formation in the optical domain, and after optical / electrical conversion, it outputs multiple beams in the electrical domain. The whole device is composed of an antenna array, a radio frequency receiving component, an optical beam forming network, a beam control module, an integrated signal processing module, and a monitoring subsystem. The antenna array and the radio frequency receiving component are blindly connected through an SMA connector to transmit radio frequency signals; the optical control beam forming network receives the radio frequency signal from the receiving radio frequency receiving component through a single-mode optical fiber, modulates the radio frequency signal in the optical frequency band, performs beam forming processing in the optical domain, and outputs multiple radio frequency beams to the integrated signal processing module; the integrated signal processing module is interconnected with the optical control beam forming network through an SMA interface for signal interaction; the beam control system sends control commands to the receiving component and the optical control beam forming network through the LVDS parallel bus, and receives the returned device information; the monitoring subsystem is interconnected with each module through Gigabit Ethernet, collects task information during system operation, and is responsible for storing task data. According to the mission plan, when the system needs to receive data from the target spacecraft, the downlink signals forwarded by multiple target spacecraft pass through the antenna array elements and the sub-array microwave signals output by the receiving components. After the microwave signals are converted by photoelectric conversion, the optical delay phase shift beam forming network completes the delay phase shift and signal distribution / superposition of the microwave signals in the optical domain to form multiple beams and realize spatial beam scanning. The formed beams are converted by A / D and sent to the integrated signal processing module. The integrated signal processing module completes the data processing in the corresponding digital transmission mode corresponding to the baseband device, obtains the corresponding digital transmission data, and stores it locally and through the data transmission computer for playback.

[0048] Antenna array coverage range 0 to 360 degrees in azimuth and elevation The antenna adopts the form of six triangular sub-arrays spliced ​​together into a hexagonal array disk. A single triangular sub-array contains 55 array elements, and the hexagonal array disk has a total of 330 array elements. It is used to receive electromagnetic waves radiated from space and convert them into high-frequency electrical signals. The working frequency band designed in the embodiment is 27GHz-31GHz receiving frequency band, and the instantaneous bandwidth is 4GHz, but it is not limited to this frequency band, and can be extended to any frequency band within 0-45GHz.

[0049] The RF receiving component performs low-noise amplification, phase shifting, and combining on the signals received by each antenna array element, and forms a sub-array-level RF beam signal, and sends the formed multiple sub-array-level RF beams into the optical beamforming network. The receiving component adopts the chip-based and MMCM integration route. The receiving component is divided into three unit circuit cascades, with the top layer being the low-noise amplifier, the middle layer being the multi-beamforming network, and the bottom layer being the wave control unit. The circuit distribution of the RF receiving component is structurally triangular. A single triangular antenna subarray consists of 55 array elements. The array elements of each triangular antenna subarray are connected to a 1:16 power divider, with a total of 880 array element links. The receiving component uses 6 groups The large-scale RF beamforming network realizes phase control of 5280 array element links and outputs them to the subsequent processing circuit. After electrical domain beamforming processing, each RF receiving component outputs 16 sub-array-level RF beams, and a total of 96 sub-array-level RF beam signals are output to the optical control beamforming network for subsequent optical domain beamforming processing.

[0050] The optically controlled beamforming network receives the subarray-level RF beam signal output by the receiving component. After the subarray-level RF beam signal undergoes electro-optical conversion, the optical delay and phase shifting beamforming network completes the delay and phase shifting of the RF signal in the optical domain and the signal distribution / superposition to form an optical domain beam signal and realize spatial beam scanning.

[0051] The integrated signal processing module is mainly composed of a channel unit and a receiving and demodulating unit. The channel unit converts the optical domain beam signal into a target RF beam signal through photoelectric conversion and performs A / D sampling after analog low-pass filtering, and sends the sampled digital signal to the FPGA in the receiving and demodulating unit for demodulation processing.

[0052] A beam control module, used to calculate the angle information of the aircraft, and also used to send a control command to the RF receiving component and the optical control beam forming network, the control command including the pointing information of multiple beams formed simultaneously, so that the formed sub-array-level beam signal and the optical beam signal point to the angle of the aircraft in real time;

[0053] The monitoring subsystem is used to interconnect with the RF receiving component, optical beam forming network, beam control module, and integrated signal processing module through the Gigabit network interface, collect monitoring information of the equipment, and is responsible for storing multiple high-speed digital transmission data output by the integrated signal processing module. The recording device mainly completes the demodulation data of the input beam and the transmission, storage and playback tasks of the time code, and supports the management and maintenance of the stored data, as well as the real-time monitoring and control of the system. It is mainly composed of FPGA and a large-capacity NAND FLASH solid-state storage array. The FPGA uses three Xilinx Virtex6XCVSX315T-2 FF1759 chips to receive data from the integrated signal processing module, and implements ECC encoding and decoding, equalization algorithm, and bad block removal functions through the data preprocessing unit, and stores the data in the NAND FLASH solid-state memory array. The solid-state memory array uses 48 NAND FLASH chips with a single chip density of 512Gbits, a depth of 8bits, and a model number of MT29F512G08AUCBBH8-6. Under the control of a multi-port data storage controller unit, the comprehensive data is written into three large-capacity data storage modules to complete the data recording operation.

[0054] See also Figure 2 The RF receiving component described in this embodiment has the main function of amplifying, power dividing, phase shifting and synthesizing the signal output by the signal antenna subarray, and a single RF receiving component corresponds to the antenna array subarray one by one. A single RF receiving component amplifies the RF signals received by all array elements in a single antenna subarray through a low-noise amplifier, and sends the amplified signal of each antenna array element to a 1:16 power division network. The 1:16 power division network divides each antenna array element signal into 16 independent array element signal subchannels on average. Each subchannel adjusts the phase of each subchannel signal through a phase shifter, which can achieve small-range angle tracking of the aircraft; and each channel of the power division network is numbered, and then the independent array element signal subchannels with the same number in each subarray are added through a power synthesizer to form 16 subarray-level RF beam signals, which are output to the optical beamforming network for subsequent processing. In this embodiment, the total number of antenna array elements is 330, which are divided into sub-arrays of 55 elements each, with a total of 6 sub-arrays, that is, there are 6 RF receiving components corresponding to the antenna sub-arrays, and each RF receiving component outputs 16 sub-array-level RF beam signals, for a total of 96 sub-array-level RF beam signals.

[0055] See also Figure 3The optical beamforming network described in this implementation manner adopts a modular design. Each independent optical beamforming network can receive 16 subarray-level RF beam signals. In terms of principle structure, this solution can realize an optical beamforming network structure of any target number, and number the subarray-level RF beam signals. The numbering feature is that the number of subarrays is N, and the total number of beams finally formed is M. Then the subarray-level RF beam signal N_M represents the Mth beam in the subarray N, and different optical wavelengths are assigned to it according to the ITU standard for distinction. When the number of subarrays N and the total number of beams M are expanded, the expansion of any target number of devices can be achieved by expanding the number of independent optical beamforming networks. The optical beam forming network receives 6 groups of 96 subarray-level RF beam signals in total; the subarray-level RF beam signals are fed to the electro-optical modulator, and each independent optical beam forming network modulates the corresponding 6 subarray-level RF beam signals into different optical wavelengths to obtain 16 subarray-level primary optical beam signals; the 16 independent optical beam forming networks respectively perform multi-byte delay adjustment and amplitude weighted control on each subarray-level primary optical beam signal through optical waveguides and optical power regulators to obtain subarray-level delayed optical beam signals, and then the 6 independent optical beam forming networks add the subarray-level delayed optical beam signals with the same number M value in each subarray-level delayed optical beam signal in the 6 subarrays through 16 optical power synthesizers to form 16 optical domain beam signals. Each optical domain beam signal corresponds to the RF signals of all subarrays of 16 optical wavelengths at the same time, that is, the independent synthesis of 16 beams is realized.

[0056] See also Figure 4 The integrated signal processing module described in this embodiment is mainly composed of a channel unit and a receiving demodulation unit. The channel unit converts the optical domain beam signal into a target radio frequency beam signal through photoelectric conversion and sends it to the analog-to-digital conversion chip in the receiving demodulation unit for sampling after analog low-pass filtering, and sends the sampled digital signal to the FPGA in the receiving demodulation unit for demodulation processing. The demodulation digital signal processing adopts a fully digital processing method, wherein the FPGA adopts the XilinxXC7VX690T-2FFG1927 model, the analog-to-digital conversion chip adopts the TI 12D1800RF device, the sampling bit is 12 bits, and the sampling rate is 3.6Gsps.

[0057] Referring to FIG. 5(a), the triangular antenna subarray structure described in this embodiment is filled with triangular subarrays, each triangular subarray contains 55 array elements, and the array element spacing is 6.0 mm. The triangular subarray can be decomposed into three levels from large to small: array plate, subarray and array element. Among them, 55 array elements form a triangular subarray, and 6 triangular subarrays can be expanded on the same plane to form a hexagonal array plate, as shown in FIG. 5(b). The antenna array disperses the hardware of the RF receiving component to each hexagonal array plate, and the hexagonal array plate further decomposes the beam synthesis into triangular subarrays, avoiding the situation where the beam synthesis is centralized by a central control device, reducing the hardware and assembly costs of the link cables to a certain extent, and significantly reducing the hardware complexity and improving the reliability of the system. This distributed beam synthesis scheme has obvious advantages in large arrays.

[0058] See also Figure 6 , an optoelectronic hybrid multi-beam high-speed data receiving device working steps include:

[0059] S1: The system is captured and the target aircraft sends a downlink signal;

[0060] S2: The array antenna receives the downlink signal from the target aircraft, amplifies and phase-shifts the signal, and then sends it to the optical beamforming network through the sub-array-level RF sub-beam;

[0061] S3: Optically controlled beamforming network:

[0062] 1. Receive the downlink sub-array beam signal, process it and complete the optical beam forming;

[0063] 2. Send multiple optical beams to the back-end integrated processing terminal for demodulation;

[0064] S4: Comprehensive processing terminal:

[0065] 1. Receive the downlink optical beam signal sent by the optical control beam forming network, and perform demodulation and other processing to generate information flow;

[0066] 2. Send the demodulated information and the original beam signal to the storage device;

[0067] 3. Send the post-task data according to the subsequent resend command;

[0068] 4. Detect and count the data transmission reception status and report it to the monitoring equipment;

[0069] S5: Monitoring and storage equipment:

[0070] 1. Receive the statistical results of the digital data sent by the integrated processing terminal and display them by task;

[0071] 2. Detect the status of downlink signal reception and demodulation equipment, and diagnose the health status of data transmission and task execution status in combination with the statistical results of data transmission;

[0072] 3. Control the retransmission of digital data according to the plan requirements.

[0073] Obviously, those skilled in the art can make various changes and modifications to the design of the optoelectronic hybrid multi-beam high-speed data receiving device of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An optoelectronic hybrid multi-beam high-speed data receiving device, characterized in that: It includes antenna array, RF receiving components, optical control beam forming network, and integrated signal processing module; The antenna array is divided into a plurality of sub-arrays, each of which includes a plurality of array elements, which are used to receive electromagnetic waves radiated by the aircraft in space and convert them into multiple independent radio frequency signals; The RF receiving component is connected to the antenna array surface, and is used to receive the multiple independent RF signals, and amplify, power divide, and phase shift each received RF signal to form an array element-level beam signal, add a plurality of array element-level beam signals in units of a plurality of sub-arrays to obtain a plurality of sub-array-level RF beam signals, and transmit the plurality of sub-array-level RF beam signals to the optically controlled beam forming network; The optical control beam forming network is used to perform delay, phase shift, signal distribution and superposition on a plurality of sub-array-level RF beam signals through electro-optical conversion in the optical domain to form a plurality of optical domain beam signals, and transmit the plurality of optical domain beam signals to the integrated signal processing module; The integrated signal processing module is interconnected with the optical control beam forming network, and is used to form a number of corresponding target radio frequency beam signals after photoelectric conversion of the received plurality of optical domain beam signals, perform analog-to-digital conversion on the target radio frequency beam signals to obtain digital beam signals, perform demodulation processing on the digital beam signals, and finally obtain a plurality of high-speed digital transmission data, and send them to the monitoring subsystem; The integrated signal processing module receives the target RF beam signal sent by the optical control beam forming network, performs analog-to-digital conversion to form a digital beam signal, and demodulates the digital beam signal to generate an information stream; The demodulation process includes a receiving demodulation step and a data processing step. The receiving demodulation step recovers the baseband data from the input digital beam signal through digital down-conversion, symbol synchronization, carrier synchronization and channel equalization. The data processing step recovers the transmitted information stream by decoding, descrambling and frame synchronization processing the demodulated baseband data. The information flow and the optical domain beam signal are sent to the recording device in the monitoring subsystem for recording; the monitoring subsystem detects the consistency of the information flow sent and received by comparison, collects statistics on the high-speed data reception success rate information, and reports it to the monitoring subsystem; The monitoring subsystem receives the high-speed data reception success rate information sent by the integrated signal processing module and displays it, and detects the equipment status of the RF receiving component, the optical control beam forming network, the beam control module, and the integrated signal processing module. The equipment status parameters include current, voltage, temperature, and functional abnormality indication information. Combined with the high-speed data transmission statistical results sent by the integrated signal processing module, if the bit error rate of the high-speed data transmission statistical results is greater than 1E-9, data reception is terminated, and the parameters in the equipment status parameters are queried for abnormalities. The data reception health status and task execution status are diagnosed. If the bit error rate of the high-speed data transmission statistical results is less than 1E-9, the task continues to be executed normally.

2. The optoelectronic hybrid multi-beam high-speed data receiving device according to claim 1, characterized in that: Also includes: A beam control module, used to calculate the angle information of the aircraft, and also used to send a control command to the RF receiving component and the optical control beam forming network, the control command including the pointing information of multiple beams formed simultaneously, so that the formed sub-array-level beam signal and the optical beam signal point to the angle of the aircraft in real time; The monitoring subsystem is interconnected with the RF receiving component, optical beam forming network, beam control module, and integrated signal processing module through a Gigabit network interface, and is used to collect monitoring information of the equipment and is responsible for storing multiple high-speed digital transmission data output by the integrated signal processing module.

3. The optoelectronic hybrid multi-beam high-speed data receiving device according to claim 2, characterized in that: The monitoring subsystem is composed of a monitoring computer and a recording device; wherein the monitoring computer is used to complete the unified real-time monitoring and control of the RF receiving component, the optical control beam forming network, the beam control module, and the integrated signal processing module; the recording device is used to complete the storage and playback tasks of multiple high-speed data transmission data, and supports the management and maintenance of the stored data; The recording device is composed of a field programmable gate array FPGA, a NAND FLASH solid-state storage array and a multi-port storage control unit. The field programmable gate array FPGA is used to receive multiple high-speed digital transmission data from the integrated signal processing module, and realize ECC encoding and decoding, equalization algorithm, and bad block removal functions through the data preprocessing unit. Under the control of the multi-port storage control unit, the multiple high-speed digital transmission data are stored in the NAND FLASH solid-state storage array to complete the recording operation of multiple high-speed digital transmission data.

4. The optoelectronic hybrid multi-beam high-speed data receiving device according to claim 1, characterized in that: The antenna array surface is composed of a plurality of triangular sub-arrays, each of which is composed of a plurality of antenna array elements, each of which covers a receiving frequency and is used to receive electromagnetic waves radiated from space and convert them into high-frequency electrical signals; The triangular subarray is connected to the RF receiving component via an SMA blind-plug connector to form an integrated common subarray front-end unit, which can be expanded and spliced ​​to construct a scalable full-space evolved conformal phased array.

5. The optoelectronic hybrid multi-beam high-speed data receiving device according to claim 1, characterized in that: The RF receiving component adopts the chip-based and MMCM integration route, which is divided into three unit circuit cascades, with the top layer being the low noise amplifier, the middle layer being the multi-beam forming network, and the bottom layer being the beam control unit; The RF receiving component is blindly connected to the antenna array surface through an SMA connector, and is used to preprocess the signal received by each antenna array element, and send the multiple sub-array microwave signals formed after the preprocessing into the optical beamforming network; wherein the preprocessing includes low-noise amplification, phase shifting, and combining.

6. The optoelectronic hybrid multi-beam high-speed data receiving device according to claim 1, characterized in that: The optically controlled beamforming network is used to perform photoelectric conversion on the subarray-level RF beam signal, and then the optical delay phase shifting beamforming network completes the delay phase shifting and signal distribution / superposition of the microwave signal in the optical domain to form multiple optical domain beam signals and realize spatial beam scanning.

7. An optoelectronic hybrid multi-beam high-speed data receiving method, characterized in that: include: S1: The target aircraft sends a downlink RF signal; S2: The antenna array and RF receiving components receive the downlink RF signal of the target aircraft, amplify and phase-shift the downlink RF signal, and then send the sub-array-level RF beam signal to the optical control beam forming network; S3: The optical control beam forming network receives the sub-array-level RF beam signal, processes it and completes the optical domain beam forming, generates the target RF beam signal after photoelectric conversion of multiple optical domain beam signals, and sends the target RF beam signal to the integrated signal processing module for demodulation; S4: The integrated signal processing module receives the target RF beam signal sent by the optical control beam forming network, performs analog-to-digital conversion to form a digital beam signal, processes the digital beam signal to generate an information flow, and sends the information flow and the optical domain beam signal to the recording device in the monitoring subsystem for recording; detects and counts the high-speed data reception success rate information, and reports it to the monitoring subsystem; the integrated signal processing module receives the target RF beam signal sent by the optical control beam forming network, performs analog-to-digital conversion to form a digital beam signal, and demodulates the digital beam signal to generate an information flow; The demodulation process includes a receiving demodulation step and a data processing step. The receiving demodulation step recovers the baseband data from the input digital beam signal through digital down-conversion, symbol synchronization, carrier synchronization and channel equalization. The data processing step recovers the transmitted information stream by decoding, descrambling and frame synchronization processing the demodulated baseband data. The information flow and the optical domain beam signal are sent to the recording device in the monitoring subsystem for recording; the monitoring subsystem detects the consistency of the information flow sent and received by comparison, collects statistics on the high-speed data reception success rate information, and reports it to the monitoring subsystem; S5: The monitoring subsystem receives the high-speed data reception success rate information sent by the integrated signal processing module, and displays it, detects the equipment status of the RF receiving component, the optical control beam forming network, the beam control module, and the integrated signal processing module, and diagnoses the data reception health status and the task execution status in combination with the high-speed digital data statistics sent by the integrated signal processing module; The monitoring subsystem receives the high-speed data reception success rate information sent by the integrated signal processing module, and displays it, detects the equipment status of the RF receiving component, the optical control beam forming network, the beam control module, and the integrated signal processing module, and the equipment status parameters include current, voltage, temperature, and functional abnormality indication information, and in combination with the high-speed digital data statistics sent by the integrated signal processing module, if the bit error rate of the high-speed digital data statistics is greater than 1E-9, then terminate data reception, and query whether the parameters in the equipment status parameters are abnormal, diagnose the data reception health status and the task execution status, and if the bit error rate of the high-speed digital data statistics is less than 1E-9, continue to execute the task normally.

8. The method according to claim 7, characterized in that Each independent optical beam forming network can receive 16 subarray-level radio frequency beam signals; the optical beam forming network receives 6 groups of 96 subarray-level radio frequency beam signals in total; the subarray-level radio frequency beam signals are fed to the electro-optical modulator, and each independent optical beam forming network modulates the corresponding 6 subarray-level radio frequency beam signals in different optical wavelengths to obtain 16 subarray-level primary optical beam signals; the 16 independent optical beam forming networks respectively perform multi-byte delay adjustment and amplitude weighted control on each subarray-level primary optical beam signal through an optical waveguide and an optical power regulator to obtain a subarray-level delayed optical beam signal, and then the 6 independent optical beam forming networks add the subarray-level delayed optical beam signals with the same number M value in each subarray-level delayed optical beam signal in the 6 subarrays through 16 optical power synthesizers to form 16 optical domain beam signals, and each optical domain beam signal corresponds to the radio frequency signals of all subarrays of 16 optical wavelengths at the same time, that is, to achieve independent synthesis of 16 beams.

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