PCIe-based radio astronomy band-pass signal power spectrum estimation operation card

Abstract

The utility model discloses a PCIe-based radio astronomy band-pass signal power spectrum estimation operation card, which is characterized by comprising a PPS (pulse per second) module used for receiving an input pulse per second synchronizing signal and locking the pulse per second synchronizing signal and a reference clock signal provided by a CLK clock module in a phase-locked loop mode, a clock synchronization signal of the second pulse reference is generated, and synchronous control is carried out on the DDC band-pass signal down-conversion module; the DDC band-pass signal down-conversion module is used for sequentially processing the sampling data output by the ADC sampling module according to the clock synchronization signal of the second pulse reference and then outputting the sampling data to the PFB channelization and power spectrum estimation operation module; and the PFB channelization and power spectrum estimation operation module is used for performing PFB channelization and power spectrum estimation operation on the input data to obtain a power spectrum estimation result, and transmitting the power spectrum estimation result to the PCIe interface module or the network port module for outputting. According to the invention, the flexibility of band-pass data processing is improved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a radio astronomy band communication signal power spectrum estimation operation card based on PCIe belongs to astronomical observation technical field, specifically relates to a kind of. BACKGROUND

[0002] Radio telescope receiver is the core component of radio telescope, its main function is to receive, amplify and process weak radio signals from radio sources in the universe.The performance of the receiver system directly determines the observation ability of the telescope, and a high-performance receiver can improve the resolution and sensitivity of the telescope, so that more weak radio signals can be observed.The radio telescope receiver backend system based on PCIe can be adapted in a small chassis system due to its small size and portability, which can be quickly built, and is widely used in radio astronomy fields such as radio astronomy array observation and field electromagnetic environment monitoring.The algorithm can realize the frequency-related physical characteristics research of radio sources in frequency domain through power spectrum estimation and channelization of data.

[0003] For common non-stationary signals such as pulsar search signals in astronomical observation, their frequency domain characteristics change with time, so it is necessary to understand not only the main frequency characteristics corresponding to certain local time period, but also the time and frequency localization requirements, i.e., to understand the time-frequency localization requirements.Power spectrum estimation technology is a spectrum estimation method that estimates the relationship between the power of received signals and frequency through signal correlation, and its basic function is to detect narrowband signals in wideband noise and analyze and identify weak radio astronomical signals.The basic idea of power spectrum estimation algorithm is to regard non-stationary process as a superposition of a series of short-time stationary signals, and short-time can be realized by windowing in time.Welch algorithm is a modification of periodogram method, which can reduce the variance of spectrum estimation by segmenting and windowing data without affecting the resolution.In specific algorithm application, the observed finite sample data x(n)={x(0),x(1),…,x(N-1)} is regarded as an energy-limited signal, and its Fourier transform is calculated directly using autocorrelation operation, then the square of its modulus value is taken and divided by data length N to obtain the power spectrum estimation result, which realizes the frequency-related physical characteristics research of radio sources.

[0004]

[0005] The core technology of the radio astronomy power spectrum estimation operation is the development of the PCIe data acquisition operation card. The stable high-speed real-time bandpass signal acquisition and analysis equipment determines the key of the signal transmission performance of the entire data receiving system. As an important component of the telescope receiving equipment, the bandpass signal acquisition card integrates high-speed, high-integration digital circuit chips, a large number of central processing units and high-level software technology to efficiently complete different observations. This mainly reflects in the aspects of wideband, high spectral resolution, large dynamic range and long time scale stability. In combination with the latest development of the industry and Moore's law, in recent years, the peers at home and abroad are developing and researching a new generation of radio telescope digital acquisition system. In the mainstream scheme, the ROACH2 system based on the Xilinx FPGA kernel developed by the Radio Laboratory of the University of California at Berkeley and the National Radio Astronomy Observatory of the United States is widely used in the radio astronomy field. It is mainly composed of a Xilinx Virtex-6 series FPGA as the main processing unit, a PowerPC 440EPx as the SOC for user interaction and control, and a combination of multiple FPGA function modules to complete the radio astronomy observation function.

[0006] The structure of the radio astronomy ROACH2 terminal mainly includes four modules, and the specific functions of each module are as follows:

[0007] 1. The ADC sampling module realizes the acquisition of a 500MHz bandwidth signal through a double-channel 1Gsps@8bit ADC chip;

[0008] 2. The power spectrum estimation module performs spectral channelization processing on the sampling data of the ADC through power spectrum estimation, controls the channelization spectrum operation processing of 2-8K frequency points, and realizes the frequency resolution control requirement of the radio astronomy observation data;

[0009] 3. The spectrum accumulation control module realizes the time resolution control requirement of the radio astronomy observation data through the spectrum accumulation (integration) operation;

[0010] 4. The 10GbE transmission module performs UDP or TCP / IP data encapsulation and transmission functions on the operated spectrum, and can control the setting of the transmission packet header file, the destination IP address and the MAC value and other functions;

[0011] In view of the development of the new generation of radio astronomy bandpass receiver technology, the existing radio astronomy digital terminal ROACH system cannot meet the requirements of 2.5Gsps sampling observation and 20GbE transmission bandwidth of the bandpass signal power spectrum estimation due to the capacity limitation of the hardware ADC and FPGA chips. Practical new type

[0012] The utility model discloses a radio astronomy bandpass signal power spectrum estimation card based on PCIe aims at the problems in prior art, and the purpose is to provide a radio astronomy bandpass signal power spectrum estimation card based on PCIe.

[0013] The present application is aimed at the weak signal power spectrum estimation demand of radio astronomy, realizes the research and development of the bandpass signal power spectrum estimation card based on PCIe, and completes a set of bandpass signal power spectrum estimation card based on PCIe satisfying the design parameters according to the power spectrum estimation index of FAST telescope, and the characteristics are:

[0014] 1) can cover the power spectrum estimation index of FAST telescope 70MHz~3GHz, adopts 2.5Gsps / 10bit interleaved sampling technology to improve the data dynamic range and satisfy more observation demands.

[0015] 2) carry out FPGA kernel digital frequency conversion DDC design, respectively design center shift frequency point for multiple different observation frequency bands, realize the bandpass frequency conversion shift in 70MHz~3GHz frequency range, and the design of digital DDC can effectively reduce the analog radio frequency front-end device, improve and optimize the efficiency of observation link.

[0016] 3) use the domestic FPGA and AD chip, realize the multi-phase filter kernel design of 2~16K channelization.

[0017] 5) FPGA kernel realizes Welch power spectrum estimation algorithm, and the average operation of the power spectrum of each segment is calculated after the segmented windowing processing of channelized signal.

[0018] 4) the double-interface design based on PCIe and 25GbE high-speed network interface can unpack and store the transmitted data without loss, and the power spectrum estimation function is completed by directly storing the data into the hard disk of the target computer through the RDMA mode of the gigabit network card.

[0019] 5) through the external clock and PPS second pulse design, the intra-card and inter-card synchronization of multiple cards can be realized, and the flexibility of bandpass data processing is improved.

[0020] The technical scheme of the present application is:

[0021] A radio astronomy bandpass signal power spectrum estimation operation card based on PCIe, characterized by comprising

[0022] An ADC sampling module 1 is used for sampling radio astronomy bandpass signals and sending sampling data to a DDC bandpass signal down-conversion module 4 for data processing, and receives the sampling mode set by the DDC bandpass signal down-conversion module 4.

[0023] A CLK clock module 2 is used for clock control of the ADC sampling module 1, a PPS second pulse module 3 and the DDC bandpass signal down-conversion module 4.

[0024] PPS second pulse module 3, for receiving the input second pulse synchronization signal, and locking the second pulse synchronization signal with the reference clock signal provided by the CLK clock module 2 through the phase-locked loop mode, generating the second pulse reference clock synchronization signal, and synchronously controlling the DDC passband signal down-conversion module 4;

[0025] DDC passband signal down-conversion module 4, for sequentially performing DDC digital down-conversion and FIR filtering processing on the sampling data output by the ADC sampling module 1 according to the second pulse reference clock synchronization signal, and outputting to the PFB channelization and power spectrum estimation operation module 5; the data processing process and the external memory module 6 are cached and read and written interactively;

[0026] PFB channelization and power spectrum estimation operation module 5, for performing PFB channelization and power spectrum estimation operation on the data output by the DDC passband signal down-conversion module 4, obtaining the power spectrum estimation result; and then transmitting the corresponding sub-channel power spectrum estimation bandpass data after channelization to the PCIe interface module 7 or the network port module 9 for output;

[0027] External memory module 6, for caching the FIFO queue in the data processing process of the PFB channelization and power spectrum estimation operation module 5;

[0028] PCIe interface module 7, for transmitting the data processed by the PFB channelization and power spectrum estimation operation module 5 to the workstation or server end;

[0029] QSPI Flash module 8, for storing and loading the arm architecture Linux operating system kernel file of the PFB channelization and power spectrum estimation operation module 5; and storing the setting and configuration file of the PFB channelization and power spectrum estimation operation module 5, and the setting file of the network port module 9 transmission rate;

[0030] Network port module 9, for transmitting the data processed by the PFB channelization and power spectrum estimation operation module 5 through the network protocol.

[0031] Further, the PFB channelization and power spectrum estimation operation module 5 configures the working mode of the external memory module 6, including high-speed FIFO, data ping-pong and RAM mode.

[0032] Further, the PCIe interface module 7 transmits the data processed by the PFB channelization and power spectrum estimation operation module 5 to the workstation or server end through the PCIe bus; the QSPI Flash module 8 configures the mode of the PCIe interface module 7 as x4, x8 or x16 mode, and configures the mode of the PCIe bus as RDMA mode.

[0033] Further, the QSPI Flash module 8 configures the working mode of the network port module 9 to be a 25GbE working mode or a 40GbE working mode.

[0034] Further, the sampling mode includes single-path 2.5Gsps or double-path 1.25Gsps@10bit.

[0035] Further, the external memory module 6 adopts a built-in 16GB-DDR4 high-speed memory module.

[0036] Further, the network port module 9 adopts an external 25 / 40GbE network control chip.

[0037] The PCIe-based radio astronomical band communication signal power spectrum estimation operation card of the present application includes the following modules:

[0038] The ADC sampling module 1 is used for sampling the radio astronomical band communication signal and sending it to the DDC band communication signal down-conversion module 4 for data processing, and at the same time, the ADC sampling module 1 is controlled by the DDC band communication signal down-conversion module 4 to set the sampling mode, including single-path 2.5Gsps or double-path 1.25Gsps@10bit.

[0039] The CLK clock module 2 is used for inputting the external clock of the collection card, and controlling the clock of the ADC sampling module 1, the PPS second pulse module 3 and the DDC band communication signal down-conversion module 4.

[0040] The PPS second pulse module 3 is mainly used for the synchronization between the double-path input signals in the card and the synchronization between the cards in the multi-card multi-path operation. After inputting the external second pulse synchronization signal, the PPS second pulse module 3 locks the reference clock 1GHz signal of the CLK clock module 2 through a phase-locked loop mode to generate a clock synchronization signal of the second pulse reference, and controls the synchronization of the DDC band communication signal down-conversion module 4 in the card and between the cards.

[0041] DDC band-pass signal down-conversion module 4 is used for band-pass data processing of the signal output by the ADC sampling module 1, and after DDC digital down-conversion and FIR filtering algorithm are used for frequency conversion and low-pass filtering processing of the signal, the signal is input to the PFB channelization and power spectrum estimation operation module 5, and the data processing process and the external memory module 6 are used for cache read-write interaction; wherein the second pulse reference synchronization signal input by the PPS second pulse module 3 is used for card internal synchronization and multi-card interconnection synchronization of the double-path ADC data in the DDC band-pass signal down-conversion module 4. The DDC down-conversion operation process is that after the sampling data is mixed with the built-in carrier signal, a high-frequency signal and a low-frequency signal are obtained, then the high-frequency signal generated by the mixing is filtered by the low-pass FIR filter, the baseband signal is retained, the functions of digital down-conversion and low-pass filtering are realized, then the mixing is realized by the multiplier, and the low-pass filtering is realized by the FIR filter.

[0042] The PFB channelization and power spectrum estimation operation module 5 is used for PFB channelization and power spectrum estimation operation of the data after the down-conversion and FIR filtering of the DDC band-pass signal down-conversion module 4, so as to obtain the power spectrum estimation result. The power spectrum operation is obtained by calculating the autocorrelation function, that is, after the frequency components of the FFT fast Fourier transform of the previous data are calculated, the modulus square of the spectral data is taken and divided by the frequency point length N, and the power spectrum estimation result is calculated. The corresponding sub-channel power spectrum estimation band-pass data after the channelization are transmitted to the PCIe interface module 7 or the network port module 9 for output, meanwhile, the data processing process and the external memory module 6 are used for cache read-write interaction, such as matrix transposition operation cache in the autocorrelation function operation process, and the configuration control interaction with the QSPI Flash module 8 is realized;

[0043] The external memory module 6 is a 16GB-DDR4 high-speed memory module on board, which is used for buffering the FIFO processing queue in the high-speed data stream processing process in the PFB channelization and power spectrum estimation operation module 5, and expanding the read-write cache;

[0044] The PCIe interface module 7 is used for PCIe 3.0 interface protocol transmission interaction of the data processed by the PFB channelization and power spectrum estimation operation module 5, and the data processed is transmitted to the workstation or server memory through the PCIe bus for subsequent processing;

[0045] The QSPI Flash module 8 is used for storing and loading the arm architecture Linux operating system kernel file of the PFB channelization and power spectrum estimation operation module 5, and is also used for storing the setting and configuration file of the PFB channelization and power spectrum estimation operation module 5 and the setting file of the network port module 9 transmission rate;

[0046] Network port module 9, with external 25 / 40GbE network control chip, is used for high-speed network protocol transmission to the data processed by PFB channelization and power spectrum estimation operation module 5.

[0047] Further, the PFB channelization and power spectrum estimation operation module 5 configures the working mode of the external memory module 6, including high-speed FIFO, data ping-pong and RAM mode.

[0048] Further, the QSPI Flash module 8 can configure the x4, x8 or x16 mode of the PCIe interface module 7, and the RDMA mode of the bus data.

[0049] Further, the QSPI Flash module 8 can configure the network port module 9 to use 25GbE working mode or 40GbE working mode.

[0050] The advantages of the utility model are as follows:

[0051] Aiming at the development of new generation radio astronomy bandpass power spectrum estimation operation, the 1GHz and 10GbE transmission of the existing radio astronomy digital terminal system key technical index has not been able to satisfy observation and application demand, and the corresponding bandpass data acquisition system is still in vacancy, therefore, it is urgent to carry out corresponding research, design and development work.

[0052] The application is aimed at the power spectrum estimation requirement of radio astronomy, realizes the development of the bandpass signal power spectrum estimation acquisition card based on PCIe, and completes a set of bandpass signal power spectrum estimation acquisition card based on PCIe meeting the design parameters for the FAST telescope baseband observation index, can completely cover the 1GHz baseband observation index of FAST telescope, uses 2.5Gsps / 10bit interleaved sampling technology to improve the data dynamic range and meet more observation requirements, uses domestic FPGA and AD chip, realizes the digital power spectrum estimation FPGA kernel design of 2-16K channels, through the double-interface design based on PCIe and 25 / 40GbE high-speed network port, can unpack and store the transmitted data without loss, through the RDMA mode of the gigabit network card, directly stores into the target computer hard disk, completes the power spectrum estimation function, through the external clock and PPS second pulse design, can realize the intra-card and inter-card synchronization of multiple cards, improves the flexibility of bandpass data processing. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 It is the structure diagram of the radio astronomy bandpass signal power spectrum estimation acquisition card based on PCIe.

[0054] Mark No. : 1-ADC sampling module, 2-CLK clock module, 3-PPS second pulse module, 4-DDC bandpass signal down conversion module, 5-PFB channelization and power spectrum estimation operation module, 6-external memory module, 7-PCIe interface module, 8-QSPIFlash module, 9-network port module. DETAILED DESCRIPTION

[0055] The utility model will be described in further detail below in combination with the drawings, and the examples are only used to explain the utility model and not used to limit the range of the utility model.

[0056] The main implementation functions of the PCIe-based radio astronomy bandpass signal power spectrum estimation operation card are as follows: after receiving the input intermediate frequency (IF) signal for heterodyne sampling, quantization and coding digital measurement, transmitting the signal to the DDC bandpass signal down conversion module and the PFB channelization and power spectrum estimation operation module through the data bus, performing DDC down conversion, FIR filtering, PFB channelization and power spectrum estimation processing, and storing the bandpass spectrum data into the target computer hard disk through the PCIe interface or the RDMA mode of the high-speed network interface, the power spectrum estimation function is completed.

[0057] The structure of the PCIe-based radio astronomy bandpass signal power spectrum estimation operation card is shown in Figure 1 The card mainly includes eight modules, and the specific functions of each module are as follows:

[0058] The ADC sampling module 1 adopts a domestic ADC chip to realize single-channel 2.5Gsps or double-channel 1.25Gsps @10bit performance indicators, which is used for sampling the radio astronomy bandpass signal and sending it to the DDC bandpass signal down conversion module 4 for data processing.

[0059] The CLK clock module 2 adopts a standard SMA interface to collect the external clock input, which is used for clock control of the ADC sampling module 1 and the DDC bandpass signal down conversion module 4.

[0060] The PPS second pulse module 3 is mainly used for synchronization between double-channel input signals in the card and synchronization between cards in multi-card multi-channel operation. After inputting the external second pulse synchronization signal, the reference clock 1GHz signal of the CLK clock module 2 is locked through the phase-locked loop mode to generate the clock synchronization signal of the second pulse reference, which is used for synchronization control of the DDC bandpass signal down conversion module 4 in the card and between the cards.

[0061] DDC band-pass signal down-conversion module 4 is used for band-pass data processing of the signal output by the ADC sampling module 1, and after DDC digital down-conversion and FIR filtering algorithm are used for frequency conversion and low-pass filtering processing of the signal, the signal is transmitted to the PFB channelization and power spectrum estimation operation module 5, and the data processing process and the external memory module 6 are interacted with each other in the cache read-write process;

[0062] The PFB channelization and power spectrum estimation operation module 5 is used for PFB channelization and power spectrum estimation operation of the data after DDC band-pass signal down-conversion module 4 down-conversion and FIR filtering, and the power spectrum estimation result PFB channelization and power spectrum estimation operation is obtained. The corresponding sub-channel power spectrum estimation band-pass data after channelization is transmitted to the PCIe interface module 7 or the network port module 9 for output, and the data processing process and the external memory module 6 are interacted with each other in the cache read-write process, such as matrix transposition operation cache in the autocorrelation function operation process, and the QSPI Flash module 8 is configured and controlled to interact;

[0063] The external memory module 6 is a 16GB-DDR4 high-speed memory module on board, which buffers the FIFO processing queue in the high-speed data stream processing process in the PFB channelization and power spectrum estimation operation module 5, and expands the read-write cache. The working mode of the external memory module 6 can be configured through the PFB channelization and power spectrum estimation operation module 5, including high-speed FIFO, data ping-pong and RAM mode.

[0064] The PCIe interface module 7 is a hard-core PCIe interface protocol of the FPGA chip, which realizes PCIe interface protocol transmission of the data processed by the FPGA, supports x4, x8 and x16 modes, and transmits the processed data to the workstation or server memory through the PCIe bus through the module 10-gigabit network card RDMA mode for subsequent processing;

[0065] The QSPI Flash module 8 adopts a domestic QSPI Flash storage controller, which is used for storing and loading the arm architecture Linux operating system kernel file of the PFB channelization and power spectrum estimation operation module 5, and is also used for storing the setting and configuration file of the PFB channelization and power spectrum estimation operation module 5, the setting file of the network port module 9 transmission rate, the interface rate mode of the PCIe interface module 7 and the setting and configuration file of the network port module 9 transmission rate mode, such as the 25GbE working mode or the 40GbE working mode of the network port module 9.

[0066] Network port module 9, with external 25 / 40GbE network control chip, is used for high-speed network protocol transmission of data processed by PFB channelization and power spectrum estimation operation module 5. UDP or TCP / IP data encapsulation and transmission function is carried out on the spectrum after operation, and functions such as control setting transmission packet header file, destination IP address and MAC value can be controlled.

[0067] Table 1 is a total table of technical parameters of a radio astronomy band communication signal power spectrum estimation operation card based on PCIe

[0068]

[0069]

[0070] Table 2 is a digital gain configuration table of a radio astronomy band communication signal power spectrum estimation operation card based on PCIe

[0071] Gain (0x) ffff 13fff 19fff 1ffff 2ffff 4ffff 6ffff 8ffff affff cffff On 17576 23042 31265 39418 61876 108332 146367 188448 229721 272954 Off 8112 11100 16538 21346 35631 63211 87124 112828 121857 162976 Y 2.21 2.07 1.89 1.85 1.73 1.71 1.68 1.68 1.67 1.68 Gain (0x) fffff 11ffff 17ffff 1dffff 1fffff 28ffff 38ffff 4fffff ffffff fffffff On 336298 375347 495816 616020 662924 827771 1081200 1474000 2.19x106 2.31x106 Off 203929 223592 295495 371883 410102 523571 720204 1030769 1.87x106 2.30x106 Y 1.66 1.65 1.65 1.65 1.64 1.61 1.53 1.43 1.17 1

[0072] Although the specific embodiments of the present application are disclosed for the purpose of illustrating the present application, the purpose is to help understand the content of the present application and to implement it, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present application and the appended claims. Therefore, the present application should not be limited to the disclosed content of the best embodiment, and the scope of protection claimed by the present application is subject to the scope defined by the claims.

Claims

1. A PCIe-based radio astronomy band communication signal power spectrum estimation operation card, characterized in that, Comprising an ADC sampling module (1) for sampling radio astronomical communication signals and sending sampled data to a DDC communication signal down-conversion module (4) for data processing; and receiving the sampling mode set by the DDC communication signal down-conversion module (4); a CLK clock module (2) for clock control of the ADC sampling module (1), the PPS second pulse module (3) and the DDC communication signal down-conversion module (4); the PPS second pulse module (3) is connected with the CLK clock module (2) and the DDC communication signal down-conversion module (4) respectively, for receiving an input second pulse synchronization signal, and locking the second pulse synchronization signal with a reference clock signal provided by the CLK clock module (2) through a phase-locked loop mode to generate a second pulse reference clock synchronization signal, and for synchronously controlling the DDC communication signal down-conversion module (4); the DDC communication signal down-conversion module (4) is connected with the ADC sampling module (1), the CLK clock module (2), the PPS second pulse module (3), the PFB channelization and power spectrum estimation operation module (5), and the external memory module (6) respectively, for sequentially performing DDC digital down-conversion and FIR filtering processing on the sampling data output by the ADC sampling module (1) according to the second pulse reference clock synchronization signal, and outputting to the PFB channelization and power spectrum estimation operation module (5); the data processing process is cached and read and written interactively with the external memory module (6); the PFB channelization and power spectrum estimation operation module (5) is connected with the DDC communication signal down-conversion module (4), the external memory module (6), the PCIe interface module (7), the QSPIFlash module (8), and the network port module (9) respectively, for performing PFB channelization and power spectrum estimation operation on the data output by the DDC communication signal down-conversion module (4) to obtain power spectrum estimation results; and then transmitting the corresponding sub-channel power spectrum estimation bandpass data after channelization to the PCIe interface module (7) or the network port module (9) for output; the external memory module (6) is used for caching the FIFO queue in the data processing process of the PFB channelization and power spectrum estimation operation module (5); the PCIe interface module (7) is used for transmitting the data processed by the PFB channelization and power spectrum estimation operation module (5) to a workstation or a server end; the QSPIFlash module (8) is used for storing and loading the arm architecture Linux operating system kernel file of the PFB channelization and power spectrum estimation operation module (5); and storing the setting and configuration file of the PFB channelization and power spectrum estimation operation module (5) and the setting file of the transmission rate of the network port module (9); the network port module (9) is used for network protocol transmission of the data processed by the PFB channelization and power spectrum estimation operation module (5). The PFB channelization and power spectrum estimation operation module (5) configures the working mode of the external memory module (6), including high-speed FIFO, data ping-pong and RAM mode.

2. The PCIe-based radio astronomical band communication signal power spectrum estimation operation card according to claim 1, characterized in that, ​ 3. The PCIe-based radio astronomical band communication signal power spectrum estimation operation card according to claim 1, characterized in that, The PCIe interface module (7) transmits the data processed by the PFB channelization and power spectrum estimation operation module (5) to the workstation or server end through the PCIe bus; the QSPI Flash module (8) configures the mode of the PCIe interface module (7) as x4, x8 or x16 mode, and configures the mode of the PCIe bus as RDMA mode.

4. The PCIe-based radio astronomical band communication signal power spectrum estimation operation card according to claim 1 or 2 or 3, characterized in that, The QSPI Flash module (8) configures the working mode of the network port module (9) as 25GbE working mode or 40GbE working mode.

5. The PCIe-based radio astronomical band communication signal power spectrum estimation operation card according to claim 1 or 2 or 3, characterized in that, The sampling mode includes single-channel 2.5Gsps or double-channel 1.25Gsps@10bit.

6. The PCIe-based radio astronomical band communication signal power spectrum estimation operation card according to claim 1 or 2 or 3, characterized in that, The external memory module (6) adopts a built-in 16GB-DDR4 high-speed memory module.

7. The PCIe-based radio astronomical band communication signal power spectrum estimation operation card according to claim 1 or 2 or 3, characterized in that, The network port module (9) adopts an external 25 / 40GbE network control chip.

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