Dual-frequency multi-beam phased array system, signal processing method, device and storage medium

Abstract

The application provides a dual-frequency multi-beam phased array system, a signal processing method, equipment and a storage medium. The system comprises: a common-aperture broadband antenna array surface configured to radiate and / or receive a composite broadband radio frequency signal containing a first frequency band and a second frequency band; a ratio of center frequencies of the first frequency band and the second frequency band is in a preset range; a shared broadband radio frequency front end configured to perform analog domain bidirectional frequency conversion on the composite broadband radio frequency signal and a composite broadband baseband signal; a signal conversion module configured to perform analog-to-digital conversion and / or digital-to-analog conversion on the composite broadband baseband signal and a composite broadband digital signal; and a digital signal processing module configured to perform bidirectional digital spectrum conversion between the composite broadband digital signal and independent baseband signal streams of the first frequency band and the second frequency band in a digital baseband domain, and to perform independent beam forming on the independent baseband signal streams of the first frequency band and the second frequency band, respectively.

Description

Technical Field

[0001] This application relates to the field of phased array technology, and in particular to a dual-frequency multi-beam phased array system, signal processing method, device and storage medium. Background Technology

[0002] A phased array, also known as a phase-compensated (or delay-compensated) array, can be used for both receiving and transmitting signals, and can be applied in fields such as satellite communication, radar detection, and electronic countermeasures. A phased array system can simultaneously support independent operation of multiple beams across multiple frequency bands. Traditional single-frequency, single-antenna solutions result in a wide variety of antenna types, dispersed layouts, and low resource utilization, making them insufficient to meet current requirements. Multi-frequency, common-aperture phased array antenna technology has emerged to address this need, aiming to achieve multi-frequency signal transmission and reception and beam control through a single physical aperture.

[0003] In existing dual-band common-aperture phased array antenna schemes, one approach employs a multi-array splicing structure, using multiple antenna arrays to support different frequency bands (e.g., Figure 1 The dual-band independent channel architecture shown in the diagram, however, results in low antenna aperture utilization and system integration due to the splicing of multiple arrays, and the use of an analog multi-beam system limits beam flexibility and quantity. Another approach uses... Figure 2 The dual-band array nesting + independent RF link architecture shown provides each frequency band with a completely independent shared broadband RF front-end channel. Although it can realize independent transmission and reception and beam control of dual-band signals under the same aperture, the number of system components increases exponentially, resulting in a significant increase in size, power consumption and cost. At the same time, due to the independent channel architecture, the beamforming of each frequency band is independent but the hardware resources cannot be shared, making it difficult to achieve a balance between resource efficiency and beam flexibility.

[0004] Therefore, how to achieve independent transmission and reception of dual-band signals and flexible multi-beam control for each band under a common-aperture antenna architecture, while taking into account hardware resource costs, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this application is to provide a dual-band multi-beam phased array system, signal processing method, device and storage medium, so as to realize independent transmission and reception of dual-band signals and flexible control of their respective multi-beams under a common aperture antenna architecture, while taking into account hardware resource costs.

[0006] To achieve the above objectives, in one aspect, embodiments of this application provide a dual-frequency multi-beam phased array system, comprising: A common-aperture broadband antenna array is configured to radiate and / or receive composite broadband radio frequency signals comprising a first frequency band and a second frequency band; the ratio of the center frequencies of the first frequency band and the second frequency band is within a preset range; A shared broadband radio frequency front end is configured to perform analog-domain bidirectional frequency conversion between the composite broadband radio frequency signal and the composite broadband baseband signal; The signal conversion module is configured to perform analog-to-digital conversion and / or digital-to-analog conversion on the composite broadband baseband signal and the composite broadband digital signal; The digital signal processing module is configured to perform bidirectional digital spectrum conversion between the composite broadband digital signal and the independent baseband signal streams of the first frequency band and the second frequency band in the digital baseband domain, and to perform independent beamforming on the independent baseband signal streams of the first frequency band and the second frequency band respectively.

[0007] In the dual-band multi-beam phased array system of this application embodiment, the common-aperture broadband antenna array adopts a differentiated resource mapping architecture to map the first frequency band and the second frequency band to different numbers of channel resources of the common-aperture broadband antenna array.

[0008] In the dual-frequency multi-beam phased array system of this application embodiment, the differentiated resource mapping architecture satisfies: The first frequency band is mapped to the full array element channel of the common-aperture broadband antenna array; The second frequency band is mapped to a portion of the sub-element channels of the common-aperture broadband antenna array.

[0009] In the dual-frequency multi-beam phased array system of this application embodiment, the digital signal processing module is further configured as follows: The computing resources required for digital beamforming are dynamically allocated based on the number of channels mapped to each frequency band.

[0010] In the dual-band multi-beam phased array system of this application embodiment, the array elements in the common-aperture broadband antenna array are arranged based on the upper limit of the array element spacing to avoid generating grating lobes; the upper limit of the array element spacing is determined based on the upper limit of the operating frequency in the first frequency band and the second frequency band, and the upper limit of the scanning angle of the dual-band antenna.

[0011] In the dual-frequency multi-beam phased array system of this application embodiment, the bidirectional digital spectrum conversion includes digital spectrum separation and digital spectrum synthesis; the digital spectrum separation includes: decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams; the digital spectrum synthesis includes: merging the independent first-band baseband signal streams and second-band baseband signal streams into the composite broadband digital signal.

[0012] In the dual-frequency multi-beam phased array system of this application embodiment, the step of decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams includes: By digital mixing, the first frequency band and the second frequency band in the composite broadband digital signal are shifted to their respective baseband center frequencies to obtain the corresponding first complex baseband signal and second complex baseband signal. By filtering out out-of-band interference and guard bands between frequency bands in the first complex baseband signal and the second complex baseband signal respectively using digital filters, the corresponding first frequency band baseband signal stream and second frequency band baseband signal stream are obtained.

[0013] In the dual-frequency multi-beam phased array system of this application embodiment, the step of merging the independent first-band baseband signal stream and the second-band baseband signal stream into the composite broadband digital signal includes: The independent first-band baseband signal stream and second-band baseband signal stream are digitally spectrum shifted to restore them to their original spectrum positions, thus obtaining the corresponding first-band digital signal and second-band digital signal. The first frequency band digital signal and the second frequency band digital signal are superimposed in the digital domain to obtain a composite broadband digital signal.

[0014] In the dual-frequency multi-beam phased array system of this application embodiment, the shared broadband radio frequency front-end adopts a zero intermediate frequency (IF) architecture; the baseband analog signal is a zero IF composite signal; the analog-to-digital conversion includes: performing complex sampling on the zero IF composite signal to generate the composite broadband digital signal; the digital-to-analog conversion includes: performing complex domain digital-to-analog conversion on the composite broadband digital signal to generate the zero IF composite signal.

[0015] In the dual-frequency multi-beam phased array system of this application embodiment, the shared broadband radio frequency front-end adopts a low intermediate frequency architecture; the baseband analog signal is a real intermediate frequency signal; the analog-to-digital conversion includes: sampling the real intermediate frequency signal into a real digital signal; the digital signal processing module is further configured to perform a Hilbert transform on the real digital signal to generate the composite broadband digital signal; the digital signal processing module is also configured to perform complex conjugate mirror processing on the composite broadband digital signal to generate a real digital signal, and the digital-to-analog conversion includes: performing digital-to-analog conversion on the real digital signal to generate the real intermediate frequency signal.

[0016] In the dual-frequency multi-beam phased array system of this application embodiment, the digital signal processing module is further configured as follows: Obtain the channel response error of the common-aperture broadband antenna array at different temperatures and operating frequencies; Based on the channel response error, digital predistortion coefficients or beam weight compensation coefficients are generated for the first frequency band and the second frequency band, respectively.

[0017] In the dual-frequency multi-beam phased array system of this application embodiment, the digital signal processing module is further configured as follows: Real-time monitoring of in-band intermodulation products between the first and second frequency band signals, and acquisition of the frequency positions of the in-band intermodulation products; An adaptive notch zero is generated in the digital filter according to the frequency position to eliminate nonlinear interference falling into adjacent frequency bands.

[0018] In the dual-frequency multi-beam phased array system of this application embodiment, the beamforming weights are calculated and generated based on the center frequencies of the first frequency band and the second frequency band, and their independently configured beam pointing angles.

[0019] In the dual-frequency multi-beam phased array system of this application embodiment, the preset range includes 1.001 to 1.02.

[0020] On the other hand, embodiments of this application also provide a signal processing method, including: Based on a common-aperture broadband antenna array, a composite broadband radio frequency signal including a first frequency band and a second frequency band is radiated and / or received; the center frequency ratio of the first frequency band to the second frequency band is within a preset range; Based on a shared broadband radio frequency front-end, the composite broadband radio frequency signal and the composite broadband baseband signal are subjected to analog-domain bidirectional frequency conversion. The signal conversion module performs analog-to-digital conversion and / or digital-to-analog conversion on the composite broadband baseband signal and the composite broadband digital signal. The digital signal processing module performs bidirectional digital spectrum conversion between the composite broadband digital signal and the independent baseband signal streams of the first and second frequency bands in the digital baseband domain, and performs independent beamforming on the independent baseband signal streams of the first and second frequency bands respectively.

[0021] In the signal processing method of this application embodiment, the bidirectional digital spectrum conversion includes digital spectrum separation and digital spectrum synthesis; the digital spectrum separation includes: decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams; the digital spectrum synthesis includes: merging the independent first-band baseband signal streams and second-band baseband signal streams into the composite broadband digital signal.

[0022] In the signal processing method of this application embodiment, the step of decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams includes: By digital mixing, the first frequency band and the second frequency band in the composite broadband digital signal are shifted to their respective baseband center frequencies to obtain the corresponding first complex baseband signal and second complex baseband signal. By filtering out out-of-band interference and guard bands between frequency bands in the first complex baseband signal and the second complex baseband signal respectively using digital filters, the corresponding first frequency band baseband signal stream and second frequency band baseband signal stream are obtained.

[0023] In the signal processing method of this application embodiment, the step of merging the independent first-band baseband signal stream and the second-band baseband signal stream into the composite broadband digital signal includes: The independent first-band baseband signal stream and second-band baseband signal stream are digitally spectrum shifted to restore them to their original spectrum positions, thus obtaining the corresponding first-band digital signal and second-band digital signal. The first frequency band digital signal and the second frequency band digital signal are superimposed in the digital domain to obtain a composite broadband digital signal.

[0024] In the signal processing method of this application embodiment, the shared broadband radio frequency front-end adopts a zero intermediate frequency (IF) architecture; the baseband analog signal is a zero IF composite signal; the analog-to-digital conversion includes: performing complex sampling on the zero IF composite signal to generate the composite broadband digital signal; the digital-to-analog conversion includes: performing complex domain digital-to-analog conversion on the composite broadband digital signal to generate the zero IF composite signal.

[0025] In the signal processing method of this application embodiment, the shared broadband radio frequency front-end adopts a low intermediate frequency architecture; the baseband analog signal is a real intermediate frequency signal; the analog-to-digital conversion includes: sampling the real intermediate frequency signal into a real digital signal; the digital signal processing module is further configured to perform a Hilbert transform on the real digital signal to generate the composite broadband digital signal; the digital signal processing module is also configured to perform complex conjugate mirror processing on the composite broadband digital signal to generate a real digital signal, and the digital-to-analog conversion includes: performing digital-to-analog conversion on the real digital signal to generate the real intermediate frequency signal.

[0026] In the signal processing method of this application embodiment, the method further includes: Obtain the channel response error of the common-aperture broadband antenna array at different temperatures and operating frequencies; Based on the channel response error, digital predistortion coefficients or beam weight compensation coefficients are generated for the first frequency band and the second frequency band, respectively.

[0027] In the signal processing method of this application embodiment, the method further includes: Real-time monitoring of in-band intermodulation products between the first and second frequency band signals, and acquisition of the frequency positions of the in-band intermodulation products; An adaptive notch zero is generated in the digital filter according to the frequency position to eliminate nonlinear interference falling into adjacent frequency bands.

[0028] In the signal processing method of this application embodiment, the beamforming weights are calculated and generated based on the center frequencies of the first frequency band and the second frequency band and their independently configured beam pointing angles, respectively.

[0029] In the signal processing method of this application embodiment, the preset range includes 1.001 to 1.02.

[0030] On the other hand, embodiments of this application also provide an electronic device, including: At least one processor; and At least one memory storing instructions that, when executed individually or jointly by the at least one processor, cause the electronic device to perform the methods described above.

[0031] On the other hand, embodiments of this application also provide a computer storage medium storing instructions thereon, wherein the instructions, when executed individually or jointly by at least one processor of a computer device, cause the computer device to perform the above-described method.

[0032] On the other hand, embodiments of this application also provide a computer program product, including instructions, wherein the instructions, when executed individually or jointly by at least one processor of a computer device, cause the computer device to perform the above-described method.

[0033] As can be seen from the technical solutions provided in the embodiments of this application above, in the dual-band multi-beam phased array system of this application, the common-aperture broadband antenna array and the shared broadband RF front-end constitute a unified hardware path covering dual frequency bands, enabling the antenna aperture and RF link resources to be fully reused, avoiding the hardware design complexity and hardware cost brought about by deploying independent hardware for each frequency band; on this basis, through the digital signal processing module, bidirectional digital spectrum conversion is performed in the digital baseband domain, so that the composite broadband signal that was originally indistinguishable in the analog domain is decoupled into two independent baseband signal streams (separated during reception) or synthesized into one composite signal (reconstructed during transmission) in the digital domain, thereby realizing independent transmission and reception of dual-band multi-beams and flexible control of each multi-beam on the same physical aperture, ultimately realizing independent transmission and reception of dual-band signals and flexible control of each multi-beam while taking into account hardware resource costs. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A schematic diagram of a dual-frequency independent channel system architecture in the prior art is shown; Figure 2 This diagram illustrates a system architecture of dual-frequency array nesting + independent RF links in another prior art. Figure 3 A simplified structural block diagram of a dual-frequency multi-beam phased array system in some embodiments of this application is shown; Figure 4 The following are schematic diagrams of the system architecture of a dual-frequency multi-beam phased array system in other embodiments of this application; Figure 5 Flowcharts of signal processing methods in some embodiments of this application are shown; Figure 6 It shows Figure 5 The flowchart of digital spectrum separation in the illustrated embodiment; Figure 7 It shows Figure 5 The flowchart of digital spectrum synthesis in the embodiment shown is as follows; Figure 8 Structural block diagrams of electronic devices in some embodiments of this application are shown.

[0035] [Explanation of Labels in the Attached Image]

[0036] 10: Common-aperture broadband antenna array; 20: Shared broadband radio frequency front end; 30: Signal conversion module; 40: Digital signal processing module; 800: Electronic devices; 810: Processor; 820: Memory; 830: Program; 840: Transceiver; 850: Antenna. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0038] It should be noted that in the embodiments of this application, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved are all information and data authorized and agreed upon by the user and fully authorized by all parties. That is, the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with the relevant provisions of national laws and regulations.

[0039] In the description of this application, unless otherwise stated, "and / or" is a term describing the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone, where A and B can be singular or plural. Furthermore, in the description of this disclosure, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0040] In this application, the expressions "greater than" or "less than" may be used to determine whether a specific condition is met, but this is only for illustrative purposes and is not intended to exclude statements of "above" or "below". A condition expressed as "above" may be replaced by "greater than", a condition expressed as "below" may be replaced by "less than", and a condition expressed as "above and less than" may be replaced by "greater than and below". Furthermore, hereinafter, "A" to "B" represent at least one of the elements from A (inclusive of A) to B (inclusive of B).

[0041] In the embodiments of this application, the singular forms "a," "the," etc., including the plural forms, should be broadly understood as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms, unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0042] This application provides the method operation steps as described in the embodiments or flowcharts, but based on conventional or non-inventive labor, more or fewer operation steps may be included. The order of steps listed in the embodiments is merely one possible execution order among many steps and does not represent the only execution order. In actual system or device products, the methods shown in the embodiments or drawings can be executed sequentially or in parallel.

[0043] It should be noted that in the embodiments of this application, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, it does not mean that the applicant has used or necessarily used the solution.

[0044] This application uses terminology used in some communication specifications (such as 3GPP, the European Telecommunications Standards Institute (ETSI), Extensible Radio Access Network (ERAN), and Open-Radio Access Network (O-RAN)) to describe various embodiments, but this is merely illustrative. The various embodiments of this application can also be readily modified and applied in other communication systems.

[0045] In the embodiments of this application, communication between devices in the communication system can be carried out according to communication protocols at any stage, such as including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR) etc., and / or other currently known or future communication protocols.

[0046] For ease of understanding, the technical terms that may be involved in the embodiments of this application are explained below.

[0047] (1) Terminal Device: refers to a device that has wireless transceiver capabilities and can cooperate with network-side devices to provide communication services to users. Terminal devices can also be called terminals, user equipment (UE), user terminals, mobile terminals (MT), or user agents, etc. For example, terminal devices can be mobile phones, tablets, laptops, wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless communication devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, Internet of Things (IoT) devices, narrowband Internet of Things (NB-IoT) devices, vehicle-to-everything (V2X) devices, devices in device-to-device communication (D2D), enhanced machine-type communication (eMTC) devices, and reduced-capacity devices. Capability (RedCap), cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), clients, handheld devices with wireless communication capabilities, vehicle-mounted devices, or shipboard devices, etc.

[0048] In scenarios such as the Internet of Things (IoT), terminal devices can also be machines or devices used for monitoring or measurement, including but not limited to: machine-type communication (MTC) terminals, vehicle-mounted communication terminals, device-to-device terminals, machine-to-machine (M2M) terminals, and so on.

[0049] (2) Network equipment: refers to network-side equipment capable of communicating with terminal equipment. Network equipment can be located on satellites or the ground. Network equipment can also be called space base station, satellite-borne base station, satellite, satellite communication node, satellite network terminal equipment, satellite communication module, or base station, etc. This network-side equipment can also be called access network equipment or wireless access network equipment. Network-side equipment can be a base station (BTS) in a satellite-borne Global System for Mobile Communication (GSM) or Code Division Multiple Access (CDMA) communication system; a base station (NodeB, NB) in a satellite-borne Wideband Code Division Multiple Access (WCDMA) system; an evolved base station (eNB, eNodeB) in a satellite-borne LTE system; a base station in a terrestrial network or non-terrestrial network (NTN), such as a base station (gNB) in a satellite-borne 5G network; a base station in a future network (e.g., 6G network) after 5G, carried by satellite; a base station in a future evolved Public Land Mobile Network (PLMN) network, carried by satellite; a Transmission Reception Point (TRP), carried by satellite; or a Cloud Radio Access Network, carried by satellite. In the context of Networks (CRAN), wireless controllers can also be satellite-borne city base stations, micro base stations, pico base stations, or femtobase stations. Base stations can also be ground-based base stations capable of satellite communication, and can be referred to as Access Points (APs), 5G nodes (5th generation nodes), wireless points, or Transmission / Reception Points (TRPs), the latter having equivalent technical meanings. Network equipment can also refer to base station equipment carried by High Altitude Platform Stations (HAPS) with loiter capabilities, such as large balloons or airships, base station equipment in Roadside Units (RSUs), or base station equipment in vehicle-to-everything (V2X) networks.

[0050] Both terminal devices and base station devices can perform beamforming, but the embodiments of this application are not limited to this. In some embodiments, the terminal may or may not perform beamforming. Furthermore, the base station may or may not perform beamforming. That is, only one of the terminal and the base station can perform beamforming, or neither the terminal nor the base station may perform beamforming. In this application, a beam refers to the spatial flow of signals in a wireless channel, formed by one or more antennas or antenna elements; such a formation process can be called beamforming.

[0051] Furthermore, the terms "network side" or "network equipment side" refer to one side of the network, which can be a base station or include one or more network devices as mentioned above. The terms "terminal side" or "terminal equipment" refer to the side of the user or terminal, which can be a UE or include one or more terminal devices as mentioned above.

[0052] This application provides a dual-band multi-beam phased array system to achieve independent transmission and reception of dual-band signals and flexible multi-beam control within a common-aperture antenna architecture, while also considering hardware resource costs. This dual-band multi-beam phased array system can be applied to the aforementioned communication systems, as well as radar detection and electronic countermeasures. For example, when applied to a satellite communication system, this dual-band multi-beam phased array system can serve as a subsystem responsible for signal spatial radiation / reception and beamforming within the satellite communication system.

[0053] refer to Figure 3 As shown, in some embodiments of this application, a dual-band multi-beam phased array system may include a common-aperture broadband antenna array 10, a shared broadband RF front-end 20, a signal conversion module 30, and a digital signal processing module 40. The common-aperture broadband antenna array 10 is configured to radiate and / or receive a composite broadband RF signal comprising a first frequency band and a second frequency band. The shared broadband RF front-end 20 is configured to perform bidirectional analog-domain frequency conversion between the composite broadband RF signal and the composite broadband baseband signal. The signal conversion module 30 is configured to perform analog-to-digital conversion and / or digital-to-analog conversion between the composite broadband baseband signal and the composite broadband digital signal. The digital signal processing module 40 is configured to perform bidirectional digital spectrum conversion between the composite broadband digital signal and the independent baseband signal streams of the first and second frequency bands in the digital baseband domain, and to perform independent beamforming on the independent baseband signal streams of the first and second frequency bands, respectively. The digital baseband domain is a processing space where the signal exists in the form of a discrete digital sequence centered at zero frequency.

[0054] In the dual-band multi-beam phased array system of this application embodiment, the common-aperture broadband antenna array and the shared broadband RF front-end constitute a unified hardware path covering both frequency bands, enabling full reuse of antenna aperture and RF link resources. This avoids the hardware design complexity and hardware cost associated with deploying independent hardware for each frequency band. On this basis, a bidirectional digital spectrum conversion is performed in the digital baseband domain by a digital signal processing module. This decouples composite broadband signals that are indistinguishable in the analog domain into two independent baseband signal streams (separated during reception) or synthesized into a single composite signal (reconstructed during transmission) in the digital domain. This achieves independent transmission and reception of dual-band multi-beam signals and flexible control of each multi-beam on the same physical aperture, ultimately realizing independent transmission and reception of dual-band signals and flexible control of each multi-beam while also considering hardware resource costs.

[0055] A shared broadband RF front-end can cover the entire span of two bands simultaneously with a single broadband device. However, when the center frequencies of the two bands are far apart, the gain flatness and noise performance of the broadband device at both ends of the frequency band deteriorate significantly. Furthermore, the increased local oscillator frequency span leads to a sharp increase in the complexity and power consumption of the phase-locked loop design, making device selection difficult and resulting in a loss of cost advantages. In addition, digital domain separation requires analog-to-digital conversion to digitize the composite signal at a sampling rate covering the total bandwidth of the two bands. When the two bands are far apart, the total bandwidth increases significantly, leading to a doubling of the sampling rate. This results in a sharp increase in the back-end interface rate and data volume, potentially completely offsetting the speed reduction benefits of digital domain separation. Therefore, the dual-band multi-beam phased array system of this application is suitable for low frequency ratio scenarios where the center frequencies of the first and second bands are close (adjacent), i.e., the ratio of the center frequencies of the first and second bands is within a preset range (e.g., 1.001 to 1.02).

[0056] For example, the first frequency band The transmit and receive frequency bands are 2200MHz~2218MHz and 025MHz~2043MHz respectively, the second frequency band The transmit and receive frequency bands are 2225MHz~2230MHz and 2050~2055MHz respectively, with a center frequency ratio of 1:1.009. and Functionally independent.

[0057] A common-aperture broadband antenna array is a first-band... With the second frequency band All antenna elements are integrated within the same physical aperture (common aperture), and arranged with uniform element spacing to form a wideband antenna radiation array whose operating bandwidth covers the entire span of the dual-band spectrum. This allows both frequency bands to transmit and receive signals through the same set of physical elements, thereby achieving complete multiplexing of the antenna aperture. In some embodiments of this application, the common-aperture broadband antenna array can be selected from high-performance broadband antenna elements to ensure good radiation efficiency and impedance matching characteristics in both frequency bands.

[0058] The dual-frequency multi-beam phased array system of this application supports three operating modes: receive mode, transmit mode, and transmit / receive combined mode. In receive mode, the array elements in the common-aperture broadband antenna array can convert spatial electromagnetic waves into radio frequency current signals, which include a first frequency band. With the second frequency band All information is provided. In transmit mode, the elements in the common-aperture broadband antenna array can radiate composite broadband radio frequency signals provided by the shared broadband radio frequency front end into space in the form of electromagnetic waves. In transmit / receive mode, a portion of the elements in the common-aperture broadband antenna array are used for transmission, while another portion is used for reception; or all elements in the common-aperture broadband antenna array simultaneously receive and radiate signals in a time-division or frequency-division manner. The above three operating modes correspond to signal radiation and / or reception.

[0059] In some embodiments of this application, to avoid grating lobes (grating lobes refer to additional beams with amplitudes comparable to the main beam generated in other directions besides the main beam during beam scanning of an antenna array, which consume radiated energy and cause spatial interference) and to ensure good scanning performance, the minimum element spacing required for the dual-band antenna is determined based on the maximum scanning angle requirement. The smaller element spacing is then selected for array arrangement, forming the basic physical structure of a common-aperture antenna for receiving or transmitting coverage. and The dual-band radio frequency signal, i.e., the array elements (i.e., antenna elements) in the common aperture broadband antenna array can be arranged based on the upper limit of the array element spacing to avoid generating grating lobes; the upper limit of the array element spacing can be determined based on the upper limit of the operating frequency in the first frequency band and the second frequency band, and the upper limit of the scanning angle of the dual-band antenna.

[0060] For example, the highest operating frequency in the first and second frequency bands can be determined first. and the maximum scan angle required by the antenna Then use the formula Calculate the maximum allowable element spacing to avoid grating lobes, where for The corresponding free space wavelength.

[0061] In some embodiments of this application, the array elements of the common-aperture broadband antenna array 10 may be broadband microstrip patch antennas, Vivaldi antennas, helical antennas, broadband dipole antennas, etc.

[0062] A shared broadband RF front-end refers to a set of RF front-end hardware whose operating bandwidth simultaneously covers the entire frequency range of the first and second frequency bands. It is shared by the first and second frequency bands and is used to perform bidirectional frequency conversion in the analog domain between composite broadband RF signals and composite broadband baseband signals.

[0063] Combination Figure 4 In some embodiments of this application, the shared broadband RF front-end is located between the common-aperture broadband antenna array and the signal conversion module (including analog-to-digital converter (ADC) and digital-to-analog converter (DAC)), and consists of a low-noise amplifier (LNA), a bridge, a power amplifier (PA), a broadband filter (between the bridge and the LNA), a broadband filter (between the bridge and the PA), and a mixer ( Figure 4 It consists of components such as (not shown in the diagram), local oscillator (LO), Rx port, and Tx port. The operating bandwidth of all components covers the first frequency band. Second frequency band The overall frequency range.

[0064] Figure 4 In the shared broadband RF front-end shown, the broadband filter (between the bridge and the LNA), the LNA, the mixer, the Rx port and the corresponding LO form the receiving link (uplink). Figure 4 In the shared broadband RF front-end shown, the Tx port, mixer, PA, broadband filter (between the bridge and PA) form the transmit link (downlink).

[0065] exist Figure 4 In the receiving link of the shared broadband RF front-end shown, the composite broadband RF signal from the common-aperture broadband antenna array is first filtered by a broadband filter between the bridge and the LNA to remove out-of-band interference, ensuring the purity of the signal entering the receiving link. The filtered signal is then sent to the LNA for low-noise amplification to improve receiving sensitivity and signal-to-noise ratio. The amplified signal enters the mixer and is mixed with the local oscillator (LO) signal, down-converted to a composite broadband baseband signal. The down-converted baseband signal is output through the Rx port to the back-end signal conversion module (ADC) to complete the analog-to-digital signal conversion. Throughout the process, and The signals are combined and share the same set of receiving hardware until they enter the digital domain, at which point they are separated. Therefore, for a receiving link with a shared broadband RF front-end, it can convert the composite broadband RF signal into a composite broadband baseband signal in the analog domain.

[0066] exist Figure 4 In the transmit link of the shared broadband RF front-end shown, the baseband signal from the Tx port (from the digital-to-analog converter output of the DAC) first enters the mixer and is mixed with the local oscillator (LO) signal generated by the local oscillator, up-converting it into a composite broadband RF signal. The up-converted RF signal is then amplified by the PA to the required transmit power. The amplified signal is then filtered by a broadband filter between the bridge and the PA to remove transmit harmonics and spurious signals, ensuring the purity of the transmitted signal. The filtered composite broadband RF signal is then fed to the common-aperture broadband antenna array for radiation via the bridge. Throughout the process, and The signals share the same set of transmission hardware in a composite form, and only enter the RF front-end after being synthesized in the digital domain, reflecting the architectural feature of "digital domain synthesis and unified analog domain transmission". Therefore, for the transmission link with a shared broadband RF front-end, it can convert composite broadband baseband signals into composite broadband RF signals in the analog domain.

[0067] exist Figure 4 In the transmit link of the shared broadband RF front-end shown, the bridge can act as a coupler, used for power combining in the transmit link and for signal distribution and isolation in the receive link. Specifically, in the transmit link, the bridge efficiently combines the signals from two power amplifiers (PAs) into a single signal to drive the antenna radiation. This design allows the system to use two relatively low-power PAs, achieving higher total transmit power through bridge power combining, thus improving transmit efficiency. In the receive link, the bridge functions in the opposite way, splitting the received signal from the antenna into two equal paths, which are then processed by the two separate receive channels. Furthermore, the bridge's high port isolation effectively prevents high-power signals from leaking from the transmit link to the receive link, protecting sensitive receiver circuitry. Therefore, the bridge is... Figure 4 The key component shown is the RF front-end that enables the shared antenna for both transmitting and receiving, and ensures efficient and secure signal transmission.

[0068] In some embodiments of this application, the common-aperture broadband antenna array may employ a differentiated resource mapping architecture to map the first frequency band and the second frequency band to different numbers of channel resources on the common-aperture broadband antenna array. Specifically, the differentiated resource mapping architecture refers to the architecture where, on the same common-aperture broadband antenna array, the first frequency band... With the second frequency band The array element channel resources occupied can be different. For example, in For frequency bands requiring high gain and narrow beam, For scenarios requiring wide beam coverage or auxiliary functions, the first frequency band... All array element channels that can be mapped to the common-aperture broadband antenna array, i.e. It can occupy all array element channels to achieve high gain and narrow beam; while the second frequency band Some sub-element channels that can be mapped to the common-aperture broadband antenna array, i.e. It can occupy only a portion of the array element channels to achieve wide beam coverage or auxiliary functions; thus, the two achieve differentiated mapping and allocation at the channel resource level. Through this differentiated resource mapping, the system can flexibly allocate array resources according to the actual needs of each frequency band, thereby optimizing the corresponding beam (e.g., The beam gain and pointing accuracy are balanced, while avoiding waste (used for...). This reduces computing resources and power consumption, and improves the overall resource utilization of the system.

[0069] In some embodiments of this application, the digital signal processing module is further configured to dynamically allocate the computing resources required for digital beamforming based on the number of channels mapped to each frequency band. That is, based on the aforementioned configuration of differentiated mapping resources, the digital signal processing module also dynamically allocates computing resources according to the number of channels mapped to each frequency band. For example, Mapping to channel 512 requires... Allocate 512 digital downconverters, 512 FIR (Finite Impulse Response) filters, and corresponding beamweighting calculation resources; Mapping to 64 channels only requires... 64 processing resources are allocated. The FPGA or ASIC within the digital signal processing module can be configured accordingly based on this allocation scheme, including logic resource partitioning, clock cycle allocation, and memory bandwidth reservation. This dynamic allocation mechanism maximizes the utilization efficiency of system hardware resources, avoiding resource idleness or insufficiency caused by fixed allocation.

[0070] In some embodiments of this application, the shared broadband RF front-end may adopt a zero-IF architecture; wherein, the zero-IF architecture refers to a receiver / transmitter architecture in which the RF signal is directly down-converted to zero frequency (DC). This not only simplifies the circuit structure and eliminates the need for additional IF processing, but also reduces the design complexity and power consumption of the signal conversion module, making it suitable for integrated and miniaturized applications. In this scenario, the baseband analog signal is a zero-IF composite signal (a composite baseband analog signal with I / Q channels and a center frequency of 0Hz after down-conversion). Here, I and Q channels refer to the in-phase component (I channel) and quadrature component (Q channel) of the signal, with I channel corresponding to the real part of the complex signal and Q channel corresponding to the imaginary part of the complex signal.

[0071] Correspondingly, in scenarios where a zero-IF architecture can be adopted in the shared broadband RF front-end, the analog-to-digital conversion can be: performing complex sampling on the zero-IF composite signal (simultaneously sampling the I / Q analog signals) to generate the composite broadband digital signal (a digital signal in complex form) for subsequent digital spectrum processing; the digital-to-analog conversion can be: performing complex domain digital-to-analog conversion on the composite broadband digital signal (converting the I and Q channels of the composite broadband digital signal separately) to generate the zero-IF composite signal (zero-IF I / Q baseband analog signals) for up-conversion to RF by the RF front-end.

[0072] In other embodiments of this application, the shared broadband RF front-end may also employ a low-IF architecture; a low-IF architecture refers to a receiver / transmitter architecture where the RF signal is down-converted to a non-zero low-IF frequency (e.g., tens of MHz). This avoids the local oscillator leakage and DC offset problems inherent in zero-IF architectures, resulting in better image rejection performance. In this scenario, the baseband analog signal is a real-valued IF signal.

[0073] Correspondingly, in scenarios where a low-IF architecture can be adopted for the shared broadband RF front-end, the analog-to-digital conversion can be: sampling the real-valued IF signal into a real-valued digital signal; the digital signal processing module is further configured to perform a Hilbert transform on the real-valued digital signal to generate the composite broadband digital signal (complex form) for subsequent digital spectrum processing; wherein, the Hilbert transform is used to extract the complex envelope (analytic signal) from the real-valued digital signal; the digital signal processing module is also configured to perform complex conjugate mirror processing on the composite broadband digital signal to generate a real-valued digital signal, and the digital-to-analog conversion can be: performing a digital-to-analog conversion on the real-valued digital signal to generate the real-valued IF signal for up-conversion to RF by the RF front-end.

[0074] In the embodiments of this application, the signal conversion module is a collective term for digital-to-analog converters (DACs) and analog-to-digital converters (ADCs). An ADC can convert a composite broadband baseband signal into a composite broadband digital signal; a ADC can convert a composite broadband digital signal back into a composite broadband baseband signal. In some embodiments of this application, in complex sampling scenarios, an integrated dual-channel ADC chip can be used. A similar design can also be used for the complex domain DAC; thus, in scenarios where a zero-IF architecture is used in the shared broadband RF front-end, image rejection and local oscillator leakage can be easily compensated for through digital calibration.

[0075] Combination Figure 4As shown in the embodiments of this application, bidirectional digital spectrum conversion includes operations in two directions: digital spectrum separation and digital spectrum synthesis. Digital spectrum separation is used in the receiving link (uplink), with one composite broadband digital signal as input and two independent baseband signal streams as output. Digital spectrum synthesis is used in the transmitting link (downlink), with two independent baseband signal streams as input and one composite broadband digital signal as output. Specifically, digital spectrum separation may include: decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams, that is, dividing the composite broadband digital signal in the digital domain according to its frequency position to form independent baseband signal streams; digital spectrum synthesis may include: merging the independent first-band baseband signal streams and second-band baseband signal streams into the composite broadband digital signal, that is, merging multiple independent baseband signal streams in the digital domain according to their respective spectral positions to form one composite broadband digital signal.

[0076] In this way, by performing bidirectional digital spectrum conversion in the digital baseband domain through the digital signal processing module, the composite broadband signal that was originally indistinguishable in the analog domain is decoupled into two independent baseband signal streams (separated during reception) or synthesized into one composite signal (reconstructed during transmission) in the digital domain, thereby realizing independent transmission and reception of dual-band multi-beams and flexible control of each multi-beam on the same physical aperture.

[0077] In some embodiments of this application, decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams may include: (1) The first frequency band and the second frequency band in the composite broadband digital signal are shifted to their respective baseband center frequencies by digital mixing processing to obtain the corresponding first complex baseband signal and second complex baseband signal.

[0078] In composite broadband digital signals, the first frequency band Second frequency band Located at different positions in the baseband spectrum, such as Located between -15MHz and +3MHz, Located between +10MHz and +15MHz. The digital signal processing module can, through two parallel digital mixer channels, convert... and They were each moved to zero frequency. Specifically, the first digital mixer used a frequency equal to... The digital local oscillator (NCO) at the center frequency is multiplied by a complex broadband digital signal. The center frequency of the second digital mixer is shifted to 0Hz to obtain the first complex baseband signal; the second digital mixer uses a frequency equal to... The digital local oscillator at the center frequency will The center frequency is shifted to 0Hz to obtain the second complex baseband signal.

[0079] (2) The out-of-band interference and guard bands between frequency bands in the first complex baseband signal and the second complex baseband signal are filtered out by digital filters to obtain the corresponding first frequency band baseband signal stream and second frequency band baseband signal stream.

[0080] The first complex baseband signal (zero intermediate frequency) passes through the first digital low-pass filter. The passband width of the first digital low-pass filter is... Effective bandwidth matching, stopband coverage of the guard band and other unwanted spectra, outputting a clean first-band baseband signal stream. The second complex baseband signal (zero IF) passes through a second digital low-pass filter. The passband width of the second digital low-pass filter is... Effective bandwidth matching, stopband coverage of the guard band and other unwanted spectrum, outputting a clean second-band baseband signal stream. Thus, a single composite broadband digital signal can be clearly separated into two independent baseband signal streams. The guard band refers to the signal stream in the first frequency band. With the second frequency band An unused frequency gap is reserved between the two frequency bands to prevent mutual interference.

[0081] The aforementioned digital spectrum separation employs a combination of digital mixing and digital filtering, resulting in a lower frequency ratio ( and In adjacent scenarios, effective separation of dual frequencies can be achieved by replacing the physical domain filter with a high-selectivity filter in the digital domain (which can be designed with an extremely narrow transition band); at the same time, by filtering out the guard band, the effective bandwidth of each frequency band is narrowed, which facilitates the effective sampling rate and reduces the requirements for the back-end interface rate.

[0082] In some embodiments of this application, the step of merging the independent first-band baseband signal stream and the second-band baseband signal stream into the composite broadband digital signal may include: (1) The independent first-band baseband signal stream and second-band baseband signal stream are digitally shifted to restore them to their original spectral positions, so as to obtain the corresponding first-band digital signal and second-band digital signal.

[0083] The baseband signal stream of the first frequency band can be shifted to its original spectral position (e.g., -15MHz to +3MHz) in the composite broadband digital signal using a digital mixer to obtain the digital signal of the first frequency band; and the baseband signal stream of the second frequency band can be shifted to its original spectral position (e.g., +10MHz to +15MHz) using another digital mixer to obtain the digital signal of the second frequency band. At this point, the digital signals of the two frequency bands have been restored to their respective original spectral positions.

[0084] (2) The first frequency band digital signal and the second frequency band digital signal are superimposed in the digital domain to obtain a composite broadband digital signal.

[0085] The two digital signals that have been moved to different frequency positions are added in the digital domain to synthesize a composite broadband digital signal. Since the two signals do not overlap in the frequency domain, no aliasing distortion will occur after superposition.

[0086] Digital spectrum synthesis is the precise inverse process of digital spectrum separation. The two work together to form a complete transmit / receive closed loop. Moreover, by reconstructing composite signals through digital domain superposition, the additional losses and device overhead caused by power synthesis in the analog domain are avoided.

[0087] Beamforming refers to the process of applying different amplitude weighting coefficients and phase delays to the signals transmitted or received by each antenna element in an antenna array, so that the signals of each element are superimposed in phase in a specific direction (coherence enhancement) and canceled out of phase in other directions (coherence attenuation), thereby forming a beam pointing in a specific direction in space.

[0088] Combination Figure 4 As shown in some embodiments of this application, the above-mentioned independent beamforming of the independent baseband signal streams of the first frequency band and the second frequency band may include: the beamforming weights can be calculated and generated according to the center frequencies of the first frequency band and the second frequency band and their independently configured beam pointing angles.

[0089] Specifically, for the baseband signal stream of each frequency band, the required phase delay for each array element channel (related to its center frequency and array element position) can be calculated based on the preset beam pointing angle (each independently configured beam pointing angle). This phase delay is then converted into complex weighting coefficients and applied to the baseband data of each channel, causing coherent superposition of the signals in the target direction due to phase differences during spatial radiation. Because... and Even if the preset beam pointing angles of the two arrays are exactly the same, their center frequencies are different, resulting in different inter-element phase delays calculated based on the frequency ratio. Therefore, the weighting coefficients need to be calculated and applied independently. After beamforming is completed, each channel of the two frequency bands carries its own independent beam pointing information. This method of independently beamforming the independent baseband signal streams of the two frequency bands can effectively reduce the beamforming processing bandwidth, which is beneficial for overcoming the throughput bottleneck of the back-end chip and enabling independent expansion of the number of beams and signal bandwidth.

[0090] Furthermore, in some embodiments of this application, the digital signal processing module may also be configured as follows: (1) Obtain the channel response error of the common aperture broadband antenna array at different temperatures and operating frequencies.

[0091] Channel response error refers to the inconsistency in amplitude and phase between channels caused by factors such as temperature changes, device inconsistencies, and frequency response differences.

[0092] During system initialization or periodic calibration, a known calibration signal can be injected into the common-aperture broadband antenna array (e.g., through a built-in calibration network or external coupling) at the operating frequency. and The amplitude and phase response of each channel are measured. The measured values ​​are compared with the theoretical values ​​to obtain the channel response error of each channel at different temperatures and operating frequencies.

[0093] (2) Based on the channel response error, generate digital predistortion coefficients or beam weight compensation coefficients for the first frequency band and the second frequency band respectively.

[0094] Digital predistortion coefficients are used to pre-compensate for nonlinear distortion in power amplifiers. Beamweight compensation coefficients are weight corrections used to compensate for amplitude-phase inconsistencies between channels.

[0095] Based on the acquired channel response error, the digital signal processing module generates independent digital predistortion coefficients or beam weighting compensation coefficients for the first and second frequency bands. For example, for a certain channel in the first frequency band... Phase error at frequency point Generate the corresponding compensation coefficient This is superimposed on the beamforming weights of that channel. And for the second frequency band... Similar processing can be performed independently.

[0096] Thus, through this digital domain amplitude and phase calibration, beam pointing deviation and gain loss caused by the inconsistency in amplitude and phase response of shared RF front-end broadband devices at dual frequency points can be effectively compensated, ensuring the pointing accuracy and sidelobe performance of dual-frequency beams.

[0097] Furthermore, in some embodiments of this application, the digital signal processing module may also be configured as follows: (1) Monitor the in-band intermodulation products between the first frequency band and the second frequency band signals in real time, and obtain the frequency position of the in-band intermodulation products.

[0098] In-band intermodulation products refer to intermodulation interference caused by the interaction of dual-frequency signals due to the action of nonlinear devices (such as LNA and PA) in the shared broadband RF front-end, resulting in frequency components falling into the receiving frequency band; and the frequency position at this point refers to the center frequency value of the in-band intermodulation product.

[0099] In the receiving link, the digital signal processing module can perform spectrum monitoring of the composite broadband digital signal through FFT analysis or energy detection. Due to the first frequency band... Second frequency band When signals share the same nonlinear device, the nonlinear effects of the device will produce intermodulation products (such as third-order intermodulation components). - (etc.). Some intermodulation products may fall within the bands of adjacent frequency bands.

[0100] (2) In the digital filter, an adaptive notch zero is generated according to the frequency position to eliminate nonlinear interference falling into the adjacent frequency band.

[0101] An adaptive notch zero is a deep stopband formed at a specific frequency position in a digital filter to filter out interference signals at that frequency.

[0102] The digital signal processing module can dynamically generate adaptive notch nulls in the digital filter coefficients corresponding to the specified frequency. The frequency of the notch null is aligned with the frequency of in-band intermodulation products, and the notch depth can be adaptively adjusted according to the interference intensity. Since this notch operation is performed in the digital domain, in-band intermodulation products can be effectively filtered out with almost no impact on the target signal in adjacent frequency bands. In other words, through adaptive notch filtering in the digital domain, in-band intermodulation interference can be suppressed without increasing the number of physical filters, thus improving receiver sensitivity. Furthermore, this adaptive characteristic allows the system to cope with intermodulation variations under different signal strength and frequency combinations.

[0103] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0104] This application provides a signal processing method that can be applied to the aforementioned system. (Refer to...) Figure 5 As shown, in some embodiments of this application, the signal processing method may include the following steps: Step 501: Radiation and / or reception of composite broadband radio frequency signals including the first frequency band and the second frequency band based on the common aperture broadband antenna array; the ratio of the center frequencies of the first frequency band and the second frequency band is within a preset range.

[0105] Step 502: Perform analog-domain bidirectional frequency conversion between the composite broadband RF signal and the composite broadband baseband signal based on the shared broadband RF front end.

[0106] Step 503: Perform analog-to-digital conversion and / or digital-to-analog conversion on the composite broadband baseband signal and the composite broadband digital signal based on the signal conversion module.

[0107] Step 504: Based on the digital signal processing module, perform bidirectional digital spectrum conversion between the composite broadband digital signal and the independent baseband signal streams of the first frequency band and the second frequency band in the digital baseband domain, and perform independent beamforming on the independent baseband signal streams of the first frequency band and the second frequency band respectively.

[0108] In some embodiments of the signal processing method of this application, the bidirectional digital spectrum conversion includes digital spectrum separation and digital spectrum synthesis; the digital spectrum separation includes: decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams; the digital spectrum synthesis includes: merging the independent first-band baseband signal streams and second-band baseband signal streams into the composite broadband digital signal.

[0109] Combination Figure 6 As shown in some embodiments of this application, the step of decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams may include the following steps: Step 601: The first frequency band and the second frequency band in the composite broadband digital signal are shifted to their respective baseband center frequencies by digital mixing processing to obtain the corresponding first complex baseband signal and second complex baseband signal.

[0110] Step 602: Use digital filters to filter out out-of-band interference and guard bands between frequency bands in the first complex baseband signal and the second complex baseband signal, respectively, to obtain the corresponding first frequency band baseband signal stream and second frequency band baseband signal stream.

[0111] Combination Figure 7 As shown in some embodiments of this application, the step of merging the independent first-band baseband signal stream and the second-band baseband signal stream into the composite broadband digital signal may include the following steps: Step 701: Perform digital spectrum shifting processing on the independent first-band baseband signal stream and the second-band baseband signal stream respectively to restore them to their original spectrum positions, thereby obtaining the corresponding first-band digital signal and second-band digital signal.

[0112] Step 702: Superimpose the first frequency band digital signal and the second frequency band digital signal in the digital domain to obtain a composite broadband digital signal.

[0113] In some embodiments of the signal processing method of this application, the shared broadband radio frequency front end adopts a zero intermediate frequency (IF) architecture; the baseband analog signal is a zero IF composite signal; the analog-to-digital conversion includes: performing complex sampling on the zero IF composite signal to generate the composite broadband digital signal; the digital-to-analog conversion includes: performing complex domain digital-to-analog conversion on the composite broadband digital signal to generate the zero IF composite signal.

[0114] In some embodiments of the signal processing method of this application, the shared broadband radio frequency front-end adopts a low intermediate frequency architecture; the baseband analog signal is a real intermediate frequency signal; the analog-to-digital conversion includes: sampling the real intermediate frequency signal into a real digital signal; the digital signal processing module is further configured to perform a Hilbert transform on the real digital signal to generate the composite broadband digital signal; the digital signal processing module is also configured to perform complex conjugate mirror processing on the composite broadband digital signal to generate a real digital signal, and the digital-to-analog conversion includes: performing digital-to-analog conversion on the real digital signal to generate the real intermediate frequency signal.

[0115] In some embodiments of the signal processing method of this application, the method further includes: Obtain the channel response error of the common-aperture broadband antenna array at different temperatures and operating frequencies; Based on the channel response error, digital predistortion coefficients or beam weight compensation coefficients are generated for the first frequency band and the second frequency band, respectively.

[0116] In some embodiments of the signal processing method of this application, the method further includes: Real-time monitoring of in-band intermodulation products between the first and second frequency band signals, and acquisition of the frequency positions of the in-band intermodulation products; An adaptive notch zero is generated in the digital filter according to the frequency position to eliminate nonlinear interference falling into adjacent frequency bands.

[0117] In the signal processing methods of some embodiments of this application, the beamforming weights are calculated and generated based on the center frequencies of the first frequency band and the second frequency band and their independently configured beam pointing angles, respectively.

[0118] In some embodiments of the signal processing method of this application, the preset range includes 1.001 to 1.02.

[0119] Although the process described above includes multiple operations that occur in a specific order, it should be clearly understood that these processes may include more or fewer operations that can be executed sequentially or in parallel (e.g., using parallel processors or a multithreaded environment).

[0120] This application also provides an electronic device. (See reference...) Figure 8 The diagram shown is a schematic representation of the electronic device according to an embodiment of this application. Figure 8As shown, the electronic device 800 may include a processor 810 (e.g., a central processing unit CPU) and a memory 820; the memory 820 is coupled to the processor 810. The memory 820 can store various types of data; it also stores an information processing program 830, and executes the program 830 under the control of the processor 810.

[0121] For example, processor 810 can be configured to execute a program to implement the signal processing method described in the previous embodiment. For example, processor 810 can be configured to perform the following control: radiating and / or receiving a composite broadband radio frequency signal including a first frequency band and a second frequency band based on a common-aperture broadband antenna array; the center frequency ratio of the first frequency band to the second frequency band is within a preset range; performing bidirectional analog-domain frequency conversion between the composite broadband radio frequency signal and the composite broadband baseband signal based on a shared broadband radio frequency front end; performing analog-to-digital conversion and / or digital-to-analog conversion between the composite broadband baseband signal and the composite broadband digital signal based on a signal conversion module; performing bidirectional digital spectrum conversion between the composite broadband digital signal and the independent baseband signal streams of the first frequency band and the second frequency band in the digital baseband domain based on a digital signal processing module; and performing independent beamforming on the independent baseband signal streams of the first frequency band and the second frequency band, respectively.

[0122] In addition, such as Figure 8 As shown, the electronic device 800 may also include a transceiver 840 and an antenna 850, etc.; the functions of the above components are similar to those in the prior art, and will not be described in detail here. It is worth noting that the electronic device 800 is not necessarily required to include... Figure 8 All components shown; in addition, the electronic device 800 may also include Figure 8 For components not shown, please refer to existing technologies.

[0123] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the method embodiments are basically similar to the system embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the system embodiments.

[0124] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), computer-readable storage media, and computer program products according to some embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processor to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processor, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0125] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processor to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0126] These computer program instructions may also be loaded onto a computer or other programmable data processor, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0127] In a typical configuration, a computer device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0128] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0129] Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can store information using any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by computer equipment. As defined in this application, computer-readable media does not include transient media, such as modulated data signals and carrier waves.

[0130] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0131] The embodiments of this application can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. The embodiments of this application can also be practiced in distributed computing environments where tasks are performed by remote processors connected via a communication network. In a distributed computing environment, program modules can reside in local and remote computer storage media, including storage devices.

[0132] It should also be understood that, in the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0133] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this application, as well as the features of different embodiments or examples.

[0134] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A dual-frequency multi-beam phased array system, characterized in that, include: A common-aperture broadband antenna array is configured to radiate and / or receive composite broadband radio frequency signals comprising a first frequency band and a second frequency band; the ratio of the center frequencies of the first frequency band and the second frequency band is within a preset range; A shared broadband radio frequency front end is configured to perform analog-domain bidirectional frequency conversion between the composite broadband radio frequency signal and the composite broadband baseband signal; The signal conversion module is configured to perform analog-to-digital conversion and / or digital-to-analog conversion on the composite broadband baseband signal and the composite broadband digital signal; The digital signal processing module is configured to perform bidirectional digital spectrum conversion between the composite broadband digital signal and the independent baseband signal streams of the first frequency band and the second frequency band in the digital baseband domain, and to perform independent beamforming on the independent baseband signal streams of the first frequency band and the second frequency band respectively.

2. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The common-aperture broadband antenna array adopts a differentiated resource mapping architecture to map the first frequency band and the second frequency band to different numbers of channel resources of the common-aperture broadband antenna array.

3. The dual-frequency multi-beam phased array system according to claim 2, characterized in that, The differentiated resource mapping architecture satisfies: The first frequency band is mapped to the full array element channel of the common-aperture broadband antenna array; The second frequency band is mapped to a portion of the sub-element channels of the common-aperture broadband antenna array.

4. The dual-frequency multi-beam phased array system according to claim 2, characterized in that, The digital signal processing module is further configured as follows: The computing resources required for digital beamforming are dynamically allocated based on the number of channels mapped to each frequency band.

5. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The array elements in the common-aperture broadband antenna array are arranged based on the upper limit of the element spacing to avoid generating grating lobes; the upper limit of the element spacing is determined based on the upper limit of the operating frequency in the first frequency band and the second frequency band, as well as the upper limit of the scanning angle of the dual-band antenna.

6. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The bidirectional digital spectrum conversion includes digital spectrum separation and digital spectrum synthesis; the digital spectrum separation includes decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams; the digital spectrum synthesis includes merging the independent first-band baseband signal streams and second-band baseband signal streams into the composite broadband digital signal.

7. The dual-frequency multi-beam phased array system according to claim 6, characterized in that, The step of decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams includes: By digital mixing, the first frequency band and the second frequency band in the composite broadband digital signal are shifted to their respective baseband center frequencies to obtain the corresponding first complex baseband signal and second complex baseband signal. By filtering out out-of-band interference and guard bands between frequency bands in the first complex baseband signal and the second complex baseband signal respectively using digital filters, the corresponding first frequency band baseband signal stream and second frequency band baseband signal stream are obtained.

8. The dual-frequency multi-beam phased array system according to claim 6, characterized in that, The process of merging the independent first-band baseband signal stream and the second-band baseband signal stream into the composite broadband digital signal includes: The independent first-band baseband signal stream and second-band baseband signal stream are digitally spectrum shifted to restore them to their original spectrum positions, thus obtaining the corresponding first-band digital signal and second-band digital signal. The first frequency band digital signal and the second frequency band digital signal are superimposed in the digital domain to obtain a composite broadband digital signal.

9. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The shared broadband radio frequency front-end adopts a zero intermediate frequency architecture; The baseband analog signal is a zero intermediate frequency composite signal; The analog-to-digital conversion includes: performing complex sampling on the zero-IF composite signal to generate the composite broadband digital signal; the digital-to-analog conversion includes: performing complex-domain digital-to-analog conversion on the composite broadband digital signal to generate the zero-IF composite signal.

10. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The shared broadband radio frequency front-end adopts a low-intermediate frequency architecture; The baseband analog signal is a real intermediate frequency (IF) signal; the analog-to-digital conversion includes: sampling the real IF signal into a real digital signal; the digital signal processing module is further configured to perform a Hilbert transform on the real digital signal to generate the composite broadband digital signal; the digital signal processing module is also configured to perform complex conjugate mirror processing on the composite broadband digital signal to generate a real digital signal, and the digital-to-analog conversion includes: performing a digital-to-analog conversion on the real digital signal to generate the real IF signal.

11. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The digital signal processing module is further configured to: Obtain the channel response error of the common-aperture broadband antenna array at different temperatures and operating frequencies; Based on the channel response error, digital predistortion coefficients or beam weight compensation coefficients are generated for the first frequency band and the second frequency band, respectively.

12. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The digital signal processing module is further configured to: Real-time monitoring of in-band intermodulation products between the first and second frequency band signals, and acquisition of the frequency positions of the in-band intermodulation products; An adaptive notch zero is generated in the digital filter according to the frequency position to eliminate nonlinear interference falling into adjacent frequency bands.

13. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The beamforming weights are calculated and generated based on the center frequencies of the first and second frequency bands and their independently configured beam pointing angles, respectively.

14. The dual-frequency multi-beam phased array system according to claim 1, characterized in that, The preset range includes: 1.001 to 1.

02.

15. A signal processing method, characterized in that, include: Based on a common-aperture broadband antenna array, a composite broadband radio frequency signal including a first frequency band and a second frequency band is radiated and / or received; the center frequency ratio of the first frequency band to the second frequency band is within a preset range; Based on a shared broadband radio frequency front-end, the composite broadband radio frequency signal and the composite broadband baseband signal are subjected to analog-domain bidirectional frequency conversion. The signal conversion module performs analog-to-digital conversion and / or digital-to-analog conversion on the composite broadband baseband signal and the composite broadband digital signal. The digital signal processing module performs bidirectional digital spectrum conversion between the composite broadband digital signal and the independent baseband signal streams of the first and second frequency bands in the digital baseband domain, and performs independent beamforming on the independent baseband signal streams of the first and second frequency bands respectively.

16. The signal processing method according to claim 15, characterized in that, The bidirectional digital spectrum conversion includes digital spectrum separation and digital spectrum synthesis; the digital spectrum separation includes decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams; the digital spectrum synthesis includes merging the independent first-band baseband signal streams and second-band baseband signal streams into the composite broadband digital signal.

17. The signal processing method according to claim 16, characterized in that, The step of decoupling the composite broadband digital signal into independent first-band baseband signal streams and second-band baseband signal streams includes: By digital mixing, the first frequency band and the second frequency band in the composite broadband digital signal are shifted to their respective baseband center frequencies to obtain the corresponding first complex baseband signal and second complex baseband signal. By filtering out out-of-band interference and guard bands between frequency bands in the first complex baseband signal and the second complex baseband signal respectively using digital filters, the corresponding first frequency band baseband signal stream and second frequency band baseband signal stream are obtained.

18. The signal processing method according to claim 16, characterized in that, The process of merging the independent first-band baseband signal stream and the second-band baseband signal stream into the composite broadband digital signal includes: The independent first-band baseband signal stream and second-band baseband signal stream are digitally spectrum shifted to restore them to their original spectrum positions, thus obtaining the corresponding first-band digital signal and second-band digital signal. The first frequency band digital signal and the second frequency band digital signal are superimposed in the digital domain to obtain a composite broadband digital signal.

19. The signal processing method according to claim 15, characterized in that, The shared broadband radio frequency front-end adopts a zero intermediate frequency architecture; The baseband analog signal is a zero intermediate frequency composite signal; The analog-to-digital conversion includes: performing complex sampling on the zero-IF composite signal to generate the composite broadband digital signal; the digital-to-analog conversion includes: performing complex-domain digital-to-analog conversion on the composite broadband digital signal to generate the zero-IF composite signal.

20. The signal processing method according to claim 15, characterized in that, The shared broadband radio frequency front-end adopts a low-intermediate frequency architecture; The baseband analog signal is a real intermediate frequency (IF) signal; the analog-to-digital conversion includes: sampling the real IF signal into a real digital signal; the digital signal processing module is further configured to perform a Hilbert transform on the real digital signal to generate the composite broadband digital signal; the digital signal processing module is also configured to perform complex conjugate mirror processing on the composite broadband digital signal to generate a real digital signal, and the digital-to-analog conversion includes: performing a digital-to-analog conversion on the real digital signal to generate the real IF signal.

21. The signal processing method according to claim 15, characterized in that, The method further includes: Obtain the channel response error of the common-aperture broadband antenna array at different temperatures and operating frequencies; Based on the channel response error, digital predistortion coefficients or beam weight compensation coefficients are generated for the first frequency band and the second frequency band, respectively.

22. The signal processing method according to claim 15, characterized in that, The method further includes: Real-time monitoring of in-band intermodulation products between the first and second frequency band signals, and acquisition of the frequency positions of the in-band intermodulation products; An adaptive notch zero is generated in the digital filter according to the frequency position to eliminate nonlinear interference falling into adjacent frequency bands.

23. The signal processing method according to claim 15, characterized in that, The beamforming weights are calculated and generated based on the center frequencies of the first and second frequency bands and their independently configured beam pointing angles, respectively.

24. The signal processing method according to claim 15, characterized in that, The preset range includes: 1.001 to 1.

02.

25. An electronic device, characterized in that, include: At least one processor; as well as At least one memory storing instructions that, when executed individually or jointly by the at least one processor, cause the electronic device to perform the method according to any one of claims 15 to 24.

26. A computer storage medium storing instructions thereon, characterized in that, When the instructions are executed individually or jointly by at least one processor of a computer device, the computer device performs the method according to any one of claims 15 to 24.

27. A computer program product comprising instructions, characterized in that, When the instructions are executed individually or jointly by at least one processor of the computer device, the computer device performs the method according to any one of claims 15 to 24.

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