Digital Back-end Equipment of Phased Array Feed Receiver and Phased Array Feed Receiver

Abstract

The present invention provides a digital back-end device for a phased array feed receiver and a phased array feed receiver. The digital back-end device for the phased array feed receiver includes a data transmission module, a digital signal preprocessing module, a data storage module, and a beam synthesis network module. The digital signal preprocessing module includes a programmable logic gate array integrated with multiple multi-channel analog-to-digital converters. Each multi-channel analog signal converter is used to parallel-convert multiple channels of analog data to obtain multiple channels of digital data. The programmable logic gate array is used to perform channelization processing on the multiple channels of digital data and send the data after channelization processing to the data transmission module. The beam synthesis network module is used to perform calibration or beam synthesis according to the data after channelization processing. The present invention can reduce the hardware cost, and can implement two working modes of offline beam synthesis and real-time beam synthesis, and efficiently utilize the system storage resources.

Description

Technical Field

[0001] The present invention relates to the technical field of radio telescopes, and more particularly, to a digital backend device for a phased array feed receiver and a phased array feed receiver. Background Art

[0002] A radio telescope generally consists of two major parts: an antenna and a receiving system. The receiving system includes a feed and a receiver component. The existing phased array feed (PAF) receiver system has advantages such as high gain, large field of view, and controllable far-field pattern. By parallelly expanding traditional receiver technology, a PAF digital backend beamforming network can be realized. This solution samples multiple RF signals through multiple sampling cards, independently processes multi-channel data, synchronously stores it in a data server, and then completes the calculation of the beamforming network in an offline manner.

[0003] The above digital backend solution samples and independently processes each RF signal channel, wasting computing resources and having a high hardware cost. Summary of the Invention

[0004] The present invention solves the problem of wasting computing resources and having a high hardware cost in the existing digital backend solution for radio telescope receivers.

[0005] To solve the above problems, the present invention provides a digital backend device for a phased array feed receiver, including a data transmission module, and a digital signal preprocessing module, a data storage module, and a beamforming network module respectively connected to the data transmission module; the digital signal preprocessing module includes a programmable logic gate array integrated with multiple multi-channel analog-to-digital converters. Each multi-channel analog signal converter is used to parallelly convert multi-channel analog data into multi-channel digital data. The programmable logic gate array is used to perform channelization processing on the multi-channel digital data and send the data after channelization processing to the data transmission module; the data transmission module is used to send the data after channelization processing to the data storage module and / or the beamforming network module; the beamforming network module is used to perform calibration or beamforming according to the data after channelization processing; the data storage module is used to store the data after channelization processing and / or the astronomical observation data obtained by the beamforming network module through beamforming.

[0006] Optionally, the beamforming network module includes multiple independent beamforming network sub-modules, and each beamforming network sub-module respectively includes a computing server and multiple graphics processors.

[0007] Optionally, the programmable logic gate array is used to channelize the multiplexed digital data to obtain a plurality of sub-packets, and each sub-packet is respectively sent to the data storage module through the data transmission module; each sub-packet respectively includes different channel data of the oscillator units; the beam synthesis network module is used to read the sub-packets in the data storage module, and each graphics processor calibrates according to each sub-packet to obtain the weighting factors of each oscillator unit in each channel.

[0008] Optionally, the programmable logic gate array is used to respectively send each sub-packet to each graphics processor of the beam synthesis network sub-module through the data transmission module; each graphics processor of the beam synthesis network sub-module is used to perform beam synthesis according to the sub-packet and the weighting factors of each oscillator unit in each channel to obtain astronomical observation data.

[0009] Optionally, when performing calibration observation, the data transmission module sends the data after channelization processing by the programmable logic gate array to the data storage module; when performing real-time astronomical observation, the data transmission module sends the data after channelization processing by the programmable logic gate array to the beam synthesis network module.

[0010] Optionally, the data storage module includes a first memory and a second memory, and the read / write speed of the first memory is greater than that of the second memory; the first memory is used to store the data after channelization processing, and the second memory is used to store the astronomical observation data.

[0011] Optionally, it further includes a radio frequency - network cable conversion module; the radio frequency - network cable conversion module is used to connect a radio frequency transmission device and the digital signal preprocessing module.

[0012] Optionally, the digital signal preprocessing module further includes at least one network device, and the network device is communicatively connected to the digital signal preprocessing module.

[0013] Optionally, the data storage module is further used to store the weighting factors of each oscillator unit in each channel.

[0014] The present invention provides a phased array feed receiver, including the above-mentioned digital backend device of the phased array feed receiver.

[0015] The digital backend device of the phased array feed receiver provided by the embodiment of the present invention uses a multi-channel analog signal converter to implement digital signal sampling, and transmits multiple digital signals to a programmable logic gate array for preprocessing. Multiple digital signals can be processed in parallel on one programmable logic gate array, reducing the cost of the required DSP hardware compared to the traditional scheme of independent sampling and separate processing of multiple signals. Moreover, two working modes of offline beamforming and real-time beamforming can be respectively realized for system calibration and debugging and conventional astronomical observations, thus efficiently utilizing the system storage resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0017] Figure 1 It is a schematic framework diagram for implementing the PAF backend based on traditional receiver technology;

[0018] Figure 2 It is a schematic structural diagram of a digital backend device of a phased array feed receiver in an embodiment of the present invention;

[0019] Figure 3 It is a schematic system framework diagram of a digital backend device of a phased array feed receiver in an embodiment of the present invention.

[0020] Description of the reference numerals:

[0021] 101 - Data transmission module; 102 - Digital signal preprocessing module; 103 - Data storage module; 104 - Beamforming network module; 105 - Front-end module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Compared with the traditional radio astronomy receiver technology, the PAF receiver system has advantages such as high gain, large field of view, and controllable far-field pattern. By densely arranging a feed array on the focal plane to sample the focal plane field, and then realizing digital beamforming through a beamforming network to complete the observation of celestial bodies. The beamforming network of the PAF requires a large amount of calculation, which is the bottleneck restricting the application of the PAF in radio astronomy.

[0024] The PAF digital back-end beam synthesis network can be realized by parallelly expanding traditional receiver technology. In this solution, multiple sampling cards are used to sample multiple RF signals, and then multi-channel data processing is independently completed and synchronously stored in the data server. After that, the calculation of the beam synthesis network is completed in an offline manner.

[0025] As Figure 1 shown in the framework schematic diagram of realizing the PAF back-end based on traditional receiver technology, multiple RF signals collected by the array unit are transmitted to the analog signal converter through the RF front-end module. Taking the digital sampling card (Analog-to-Digital Converter, ADC) as an example, preprocessing is carried out through the Digital Signal Processing (DSP) module. Then, each signal is simultaneously transmitted to the data storage center. Finally, the High Performance Computing (HPC) server reads the data in an offline manner and performs the numerical calculation of the beam synthesis network, and stores the observation data of the synthesized beam in the data storage center.

[0026] The above digital back-end solution samples and processes each RF signal channel separately, which limits the optimization space of the DSP algorithm to a certain extent, wastes computing resources, and results in high costs. The above solution uses an offline solution to complete digital beam synthesis. The data read and write operations on the data storage center are frequent, and the total bandwidth requirement is high. When the scale of the PAF array unit is large, it will cause a storage performance bottleneck. Offline beam synthesis is beneficial for the calibration and debugging of the telescope system, but for conventional astronomical observations, this mode will introduce a large amount of data redundancy, posing a huge challenge to the system storage space and performance.

[0027] Figure 2 It is a schematic structural diagram of a digital back-end device of a phased array feed receiver in an embodiment of the present invention. The digital back-end device of the phased array feed receiver includes a data transmission module 101, and a digital signal preprocessing module 102, a data storage module 103, and a beam synthesis network module 104 respectively connected to the data transmission module 101.

[0028] Among them, the digital signal preprocessing module 102 includes a Field-Programmable Gate Array (FPGA) integrated with multiple multi-channel analog-to-digital converters. Each multi-channel analog signal converter is used to parallel-convert multiple channels of analog data to obtain multiple channels of digital data. The programmable logic gate array is used to perform channelization processing on the multiple channels of digital data and send the data after channelization processing to the data transmission module. The multi-channel analog-to-digital converter can be a multi-channel ADC sampling card. The FPGA can implement efficient Poly-phase filter bank (PFB) channelization through digital signal processing parallel algorithms, and then can also perform processing such as in-band digital gain compensation in the radio frequency passband, selection of bit quantization, matrix transpose of signal channels - frequency channels, and data formatting and packaging.

[0029] The data transmission module 101 is used to send the data after channelization processing to the data storage module and / or the beam synthesis network module. When performing calibration observations, the data transmission module 101 sends the data after channelization processing by the programmable logic gate array to the data storage module 103; when performing real-time astronomical observations, the data transmission module 101 sends the data after channelization processing by the programmable logic gate array to the beam synthesis network module 104. It can be understood that when performing real-time astronomical observations, there is no need to store the original data output by the digital signal preprocessing module. Therefore, the data transmission module 101 does not need to send the above original data to the data storage module 103, but directly sends it to the beam synthesis network module 104 for beam synthesis.

[0030] The beam synthesis network module 104 is used to perform calibration or beam synthesis according to the data after channelization processing. The beam synthesis network module 104 can implement two working modes of offline beam synthesis and real-time beam synthesis respectively for system calibration and debugging and conventional astronomical observation tasks, with flexible settings, and relatively efficiently utilize the overall storage resources of the system.

[0031] The data storage module 103 is used to store the data after channelization processing and / or the astronomical observation data obtained by the beam synthesis network module 104 through beam synthesis.

[0032] The digital backend device of the phased array feed receiver provided by the embodiment of the present invention uses a multi-channel analog signal converter to implement digital signal sampling and transmits multiple channels of digital signals to the programmable logic gate array for preprocessing. It can parallel-process multiple channels of digital signals on one programmable logic gate array, reducing the cost of the required DSP hardware compared with the traditional scheme of independent sampling and separate processing of multiple channels of signals; and can respectively implement two working modes of offline beam synthesis and real-time beam synthesis for system calibration and debugging and conventional astronomical observations, thus efficiently utilizing the system storage resources.

[0033] Figure 3 It is a schematic diagram of the system framework of a digital backend device of a phased array feed receiver in an embodiment of the present invention, showing a data transmission module 101, a digital signal preprocessing module 102, a data storage module 103, a beam synthesis network module 104, and a frontend module 105.

[0034] Optionally, the above beam synthesis network module 104 may include a plurality of independent beam synthesis network sub - modules, and each beam synthesis network sub - module includes a computing server and a plurality of graphics processors respectively. As Figure 3 shown, the beam synthesis network module 104 includes 2 independent beam synthesis network sub - modules, and each beam synthesis network sub - module is composed of 1 computing server and 2 graphics processing units (GPUs).

[0035] Optionally, the above FPGA can perform channelization processing on multiplexed digital data to obtain a plurality of sub - data packets, and send each sub - data packet to the data storage module 103 through the data transmission module 101; each sub - data packet includes different channel data of the oscillator units; the above beam synthesis network module 104 can read each sub - data packet in the data storage module 103, and each GPU calibrates according to each sub - data packet to obtain the weighting factors of each oscillator unit in each channel. As Figure 3 shown, the data transmission module 101 is described by taking a 10 - Gigabit Ethernet switch as an example.

[0036] Optionally, the FPGA can send each sub - data packet to each GPU of the beam synthesis network sub - module through the data transmission module 101; each GPU of the beam synthesis network sub - module can perform beam synthesis respectively according to the above sub - data packets and the weighting factors of each oscillator unit in each channel to obtain astronomical observation data.

[0037] The digital signal preprocessing module 102 may further include at least one network device, and this network device may be, for example, a 10 - Gigabit network card, which is communicatively connected to the digital signal preprocessing module. As Figure 3 shown, 40Gbps network cards are provided on each FPGA.

[0038] Furthermore, the above digital backend device of the phased array feed receiver may further include a radio - network cable conversion module for connecting a radio - frequency transmission device and the digital signal preprocessing module.

[0039] In the following embodiments, a specific composition of a digital backend device of a phased array feed receiver is introduced by way of example. The digital backend device of the phased array feed receiver includes:

[0040] (1) RF - Ethernet conversion module

[0041] The PAF backend device in this embodiment includes 2 independent RF - Ethernet conversion modules. Each module can realize the conversion from 32 - way SMA - interface RF transmission lines to 8 - way RJ - 45 CAT6 - type Ethernet cables. The front - end system of the radio telescope provides it to the backend system through RF cables. The RF - Ethernet converter realizes the conversion from the SMA RF interface to the RJ - 45 network interface, and transmits 4 independent RF analog signals to the ADC through 1 CAT6 - type Ethernet cable. Each ADC receives 16 - way analog signals through 4 RJ - 45s.

[0042] (2) Digital signal pre - processing module

[0043] The PAF backend device in this embodiment includes 2 independent digital signal pre - processing modules. The 2 digital signal pre - processing modules respectively process the RF signals of 2 polarizations (32 channels each) of the PAF front - end array. Each digital signal pre - processing module includes 2 16 - channel ADC sampling cards, 1 FPGA main board, and 2 4 - port 10 - Gigabit Ethernet network cards. Each of the above - mentioned ADC sampling cards receives 16 - way RF analog signals through 4 RJ - 45 network ports and real - time completes the analog - to - digital signal conversion of 8 bits. The 2 ADC sampling cards real - time transmit 32 - way 8 - bit digital signals to the FPGA main board.

[0044] In this module, 1 FPGA main board is used to receive 32 - way digital signals and perform pre - processing. Through digital signal processing parallel algorithms, PFB channelization is realized, and then digital gain compensation within the RF passband, bit - quantization selection, matrix transposition of signal channels - frequency channels, data formatting and packaging, etc. are performed. Finally, the data is transmitted to the 10 - Gigabit Ethernet network card. In this module, 2 4 - port SPF + 10Gbps 10 - Gigabit network cards are used to send the data packets processed and packaged by the FPGA main board to the 10 - Gigabit Ethernet switch.

[0045] The above - mentioned digital signal pre - processing module uses 2 16 - channel ADC sampling cards connected to 1 FPGA main board to realize the parallel processing of 32 - way digital signals of 32 oscillator units (1 polarization) on the same FPGA chip, so as to realize 32 - way signal parallel PFB channelization through an efficient DSP algorithm.

[0046] Through the preprocessing of the digitized time-domain astronomical baseband sampling signal by FPGA, the core task is to achieve frequency channelization, efficiently perform multi-channel synchronization processing on 32 signals, thereby making full use of the computing resources of the FPGA chip, while greatly reducing the demand for the number of FPGA motherboards, and effectively reducing the overall cost of the system. Compared with the traditional multi-channel signal independent sampling and preprocessing scheme, the scheme adopted in this embodiment greatly reduces the overall cost of DSP hardware.

[0047] (3) Data transmission module

[0048] The core hardware of the data transmission module in this embodiment is a 10 Gigabit Ethernet switch, which connects each functional module of the backend system through a high-speed SPF+ data transmission cable, including the digital signal preprocessing module, the digital signal preprocessing module, and the beam synthesis network module.

[0049] According to the astronomical observation requirements, the data is distributed from the digital signal preprocessing module to the data storage module and the beam synthesis network module through the 10 Gigabit Ethernet switch. For the PAF system calibration observation, the original baseband data needs to be stored. The observation data will be transmitted from the digital signal preprocessing module to the data storage module to complete data storage. Then, the beam synthesis network module will read the data through the data transmission module, perform calibration optimization calculations, and return the calibration parameters to the data storage module. For PAF astronomical observations, the original baseband data does not need to be stored. The observation data will be transmitted from the digital signal preprocessing module to the beam synthesis network. The beam synthesis network performs real-time beam synthesis calculations through predetermined calibration parameters and returns the data results of the synthesized beam to the data storage module to complete data storage.

[0050] The above 32-channel digital sampling time-domain baseband data is channelized into 1024 channels after FPGA preprocessing, forming a 32x1024 matrix. Through data packaging design in the FGPA, it is divided into two sub-packages (32x512x2) according to the number of channels. Each sub-package of data will be independently sent to a GPU computing card for processing. Each GPU computing card will obtain the data of different channels of all oscillator units, and each channel independently completes the weighted summation calculation of beam synthesis and the covariance matrix calculation required for pre-calibration.

[0051] Through the 10 Gigabit Ethernet module, the digital signal preprocessing module, the high-speed data processing module, and the beamforming network module are networked and connected. On the one hand, after the digital signal preprocessing is realized, flexible directional data distribution is achieved, and the original baseband data can be sent to the storage module or the beamforming module according to the actual functional requirements. On the other hand, the beamforming module realizes the flexible conversion of receiving baseband data from the digital preprocessing module in real time or reading offline baseband data from the data storage module. Therefore, the introduction of the 10 Gigabit Ethernet module enables the PAF back-end system to flexibly switch between PAF system calibration observation and PAF system astronomical observation according to the actual observation requirements.

[0052] (4) Data storage module

[0053] The data storage module may include a first memory and a second memory, and the read / write speed of the first memory is greater than that of the second memory. Among them, the first memory is used to store the data after channelization processing, and the second memory is used to store astronomical observation data. The above data storage module is also used to store the weighting factors of each oscillator unit of each channel.

[0054] In this embodiment, the data storage module (Data Storage) is jointly composed of a solid-state disk array and a mechanical hard disk array. The solid-state disk array has a fast read / write speed, high cost, and small storage space; the mechanical hard disk array has a relatively slow read / write speed, low price, and large storage space.

[0055] Specifically, the solid-state disk array can be used to store the original baseband data during the PAF system calibration observation. At this time, the data transmission volume is large, and fast read / write is required, but long-term storage is not required, so the total storage space requirement is relatively low. The mechanical disk array is used to store the astronomical observation data of the PAF system. At this time, only the synthesized beam data calculated by the beamforming network is stored. The data transmission volume is relatively small, and the read / write speed requirement is relatively low. However, the astronomical observation data needs to be stored for a long time, so the total storage space requirement is relatively high. Different levels of redundant array of independent disks (RAID) are used to meet their respective needs. The solid-state disk array has a high requirement for the read / write speed and is arrayed in the RAID0 mode, while the mechanical disk array needs to store data for a long time and has a high requirement for security, so it is arrayed in the RAID6 mode.

[0056] (5) Beamforming network module

[0057] The beam synthesis network module is used to achieve real-time high-performance data calculation. Due to the large amount of observed data that needs to be processed in real time, the requirement for the data calculation performance of the module is relatively high. The PAF backend system includes 2 independent beam synthesis network modules, and the 2 modules respectively process the signals of 2 polarizations (32 channels each) of the PAF front-end array. Each beam synthesis network module consists of 1 high-performance computing server (Server) and two GPUs. The computing server completes high-speed data reception, format decoding, and sends it to the GPUs to achieve real-time beam synthesis calculation. Finally, the server completes the formatting and packaging of astronomical data and sends it to the data storage module to complete data storage.

[0058] During calibration observations, the telescope is aligned with the calibration radio source for tracking observations. At this time, the data preprocessed by the FPGA is stored in the storage server in real time. After the observation is completed, the calibration software of the GPU server reads the calibration observation data, calculates the covariance matrix for the 32 signals of each frequency channel through the GPU, further solves the weighting factors of each oscillator in each channel through the beam synthesis optimization algorithm, and stores the weighting factors in the beam synthesizer for beam synthesis during subsequent real-time astronomical observations.

[0059] During real-time astronomical observations, the telescope is aligned with the radio source to be measured (or the celestial area to be measured). At this time, the data preprocessed by the FPGA is packed and distributed to each GPU according to the design requirements. On the GPU server, the complex operation of weighted summation is performed on the 32 signals of each channel in real time through the beam synthesis software to give the power spectrum of the corresponding synthesized beam, and the data is stored in the data storage server in the standard astronomical data format.

[0060] The above-mentioned PFA digital backend device provided in this embodiment has strong scalability to match the 32-element dual-polarization array of the PAF front end. It can be achieved by doubling the hardware devices and networking access through the 10 Gigabit Ethernet module. By simply setting the data distribution of the data preprocessing module, it can match the PAF front-end systems of 64 units, 128 units, and even 256 units. The data distribution network structure used in this embodiment ensures that when the system is expanded, it will not introduce higher performance requirements for a single data storage or beam synthesis module. Therefore, expanding the system devices will not cause a certain component module to become a performance bottleneck. In contrast, in traditional implementation schemes, when expanding the number of units, it will bring a bottleneck upper limit to the calculation performance requirements of the system storage and beam synthesis network, and the cost will increase sharply accordingly.

[0061] This embodiment also provides a phased array feed receiver, including the phased array feed receiver digital backend device provided in the above embodiment.

[0062] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

[0063] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0064] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A digital backend device for a phased array feed receiver, characterized in that, It includes a data transmission module, as well as a digital signal preprocessing module, a data storage module, and a beam synthesis network module that are respectively connected to the data transmission module; The digital signal preprocessing module includes a programmable logic gate array integrated with multiple multi-channel analog-to-digital converters. Each of the multi-channel analog-to-digital converters is used to parallel-convert multiple channels of analog data to obtain multiple channels of digital data. The programmable logic gate array is used to perform channelization processing on the multiple channels of digital data and send the data after channelization processing to the data transmission module; The data transmission module is used to send the data after channelization processing to the data storage module and / or the beam synthesis network module; The beam synthesis network module is used to perform calibration or beam synthesis according to the data after channelization processing; The data storage module is used to store the data after channelization processing and / or the astronomical observation data obtained by the beam synthesis network module through beam synthesis; The beam synthesis network module includes multiple independent beam synthesis network sub-modules. Each of the beam synthesis network sub-modules respectively includes a computing server and multiple graphics processors; The programmable logic gate array is used to perform channelization processing on the multiple channels of digital data to obtain multiple sub-packets, and send each sub-packet to the data storage module through the data transmission module; each of the sub-packets respectively includes different channel data of the oscillator units; The beam synthesis network module is used to read each of the sub-packets in the data storage module, and each of the graphics processors calibrates according to each of the sub-packets to obtain the weighting factors of each channel and each oscillator unit; The programmable logic gate array is used to send each of the sub-packets to each of the graphics processors of the beam synthesis network sub-module through the data transmission module; Each of the graphics processors of the beam synthesis network sub-module is used to perform beam synthesis respectively according to the sub-packet and the weighting factors of each channel and each oscillator unit to obtain astronomical observation data; among them, the beam synthesis network module has two working modes: offline beam synthesis and real-time beam synthesis.

2. The digital backend device of the phased array feed receiver according to claim 1, characterized in that When performing calibration observation, the data transmission module sends the data after channelization processing by the programmable logic gate array to the data storage module; When performing real-time astronomical observation, the data transmission module sends the data after channelization processing by the programmable logic gate array to the beam synthesis network module.

3. The digital back-end device of the phased array feed receiver according to any one of claims 1-2, characterized in that The data storage module includes a first memory and a second memory, and the read / write speed of the first memory is greater than that of the second memory; The first memory is used to store the data after channelization processing, and the second memory is used to store the astronomical observation data.

4. The digital backend device of the phased array feed receiver according to any one of claims 1-2, characterized in that, It further includes a radio frequency - network cable conversion module; The radio frequency - network cable conversion module is used to connect a radio frequency transmission device and the digital signal preprocessing module.

5. The digital backend device of the phased array feed receiver according to any one of claims 1-2, characterized in that, The digital signal preprocessing module further includes at least one network device, and the network device is communicatively connected to the digital signal preprocessing module.

6. The digital backend device of the phased array feed receiver according to claim 1, characterized in that, The data storage module is further used to store the weighting factors of each channel and each oscillator unit.

7. A phased array feed receiver, characterized in that, Including the digital back-end device of the phased array feed receiver according to any one of claims 1-6.

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