CN107015063B - Wideband multi-channel digital correlation receiver and receiving method - Google Patents

Abstract

A wideband multi-channel digital correlation receiver, comprising: a data acquisition module for inputting an intermediate frequency analog broadband signal, and performing polyphase filter channelization processing and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized orthogonal signal; correlation processing The module is connected with the data acquisition module for receiving the quantized quadrature signal, and performs complex correlation operation on the quantized quadrature signal to obtain a complex correlation result; the synchronous control module is connected with the data acquisition module and the related processing module for control, and uses The method is to receive the status signal and the complex correlation result of the data acquisition module and the related processing module, and output the received status signal and the complex correlation result after packaging. The present invention uses a polyphase filter bank and a cascaded half-band filter bank to perform polyphase filter channelization processing on the intermediate frequency analog broadband signal, so that the bandwidth and center frequency point of the baseband signal to be observed can be flexibly selected, while reducing the external Effects of environmental radio interference.

Description

Wideband multi-channel digital correlation receiver and receiving method

technical field

The invention relates to the technical field of radio observation, and more specifically relates to a broadband multi-channel digital correlation receiver and a receiving method.

Background technique

Observation in the radio band is a very important means to study celestial bodies (including the sun, the earth, planets and celestial bodies outside the solar system), called radio observation. Because radio radiation reflects important properties and states of radiators. Radio waves in different bands reflect different characteristics and states, and their radiation frequencies are closely related to environmental parameters. Therefore, according to the observation and research of radio radiation at a certain frequency, physical information such as electron density or magnetic field in the source region can be deduced.

In the field of solar physics, radio observations can provide information about the dynamic behavior of plasma and high-energy particles in the vast area from the solar chromosphere to the solar-terrestrial space, which is not available in other means. Therefore, radio observation is the most important detection method for studying the violent activities of the sun. Various spectral fine structures obtained from multi-band broadband spectrum radio observations can provide rich information on the solar coronal magnetic field, energy release mechanism, generation and propagation of high-energy particles, and corresponding radiation mechanisms. The radiation in the space near the initial energy release region of solar eruptive activities mainly occurs in the centimeter-decimeter band. In this region, the lack of imaging observations in the centimeter-decimeter band will seriously restrict the exploration of the origin, occurrence and development of violent solar activities, and limit the ability to study and predict solar activities and their impact on humans. Therefore, it is extremely important to develop a radio broadband heliograph in the centimeter-decimeter band.

So far, solar radio imaging observations have mainly focused on high-time-resolution spectral flux observations and a few frequency points: for example, the Nobeyama Radio Heliograph (NoRH) in Japan operates on two frequency points of 17GHz and 34GHz Observations; French Nancay Radio Heliograph (NRH) observed at 5 frequency points between 150 and 450MHz; Russian Irkutsk Solar Radio Telescope (Siberian Solar Radio Telescope, SSRT) at 5.7GHz observed at the frequency.

Both NoRH and NRH conduct radio imaging observations of the sun based on the interferometric imaging technology based on the synthetic aperture principle (SSRT is currently undergoing equipment transformation based on the synthetic aperture imaging technology). Generally speaking, a heliograph based on synthetic aperture imaging consists of an antenna array, an analog receiving unit, and a digital correlation receiver. Among them, the digital correlation receiver plays a core role in the heliograph: it collects, filters, preprocesses, quantizes, and complex-correlates the intermediate frequency signal output by the analog receiving unit.

Figures 1 and 2 are block diagrams of the overall structure of the NoRH digital correlation receiver, corresponding to the data acquisition-quantization part and the complex correlation part respectively. But still there is following technical defect in above-mentioned prior art:

1. The digital correlation receivers of NoRH and NRH cannot achieve multi-frequency channel flexible observation due to the limitation of technical framework. For example, the observation frequency of NoRH is only 17GHz and 34GHz, and the observation frequency of NRH is only 5 frequency points within the bandwidth of 150MHz~450MHz;

2. Because NoRH and NRH use 1-bit quantization before the complex correlation operation, the sensitivity of the correlation output is not high, and it is only 63.7% of the correlation sensitivity without quantization when the Nyquist sampling rate is satisfied.

Contents of the invention

Based on the above problems, the object of the present invention is to propose a wideband multi-channel digital correlation receiver and a receiving method for solving at least one of the above technical problems.

In order to achieve the above object, as an aspect of the present invention, the present invention provides a wideband multi-channel digital correlation receiver, comprising:

The data acquisition module is used to input the intermediate frequency analog broadband signal from radio imaging observation and collection, and perform polyphase filter channelization processing and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized orthogonal signal;

The correlation processing module is used to receive the quantized quadrature signal output by the data acquisition module, and perform a complex correlation operation on the quantized quadrature signal to obtain a complex correlation result;

The synchronous control module is used to receive the status signal and the complex correlation result of the data acquisition module and the related processing module, and output the received status signal and complex correlation result after packaging.

Further, the above-mentioned data collection module has multiple intermediate frequency input channels for inputting intermediate frequency analog broadband signals from multiple antennas for radio imaging observation and collection.

Further, the above-mentioned channelization of polyphase filtering is completed through a polyphase filter bank and a cascaded half-band filter bank. The polyphase filter bank is used to channelize the intermediate frequency analog broadband signal to obtain an orthogonal baseband signal; the cascaded half-band filter bank A band filter bank is used to convert the quadrature baseband signal into a series of quadrature baseband signals dropped by 2 times the bandwidth.

Further, the quadrature baseband signal is quantized to obtain a quantized quadrature signal.

Further, the processing of the above-mentioned intermediate frequency analog broadband signal also includes: channel selection setting, which is used to output an orthogonal baseband signal of a certain fixed bandwidth for multiple channels according to observation requirements.

Further, the processing of the above-mentioned intermediate frequency analog broadband signal also includes autocorrelation processing, and the data acquisition module sequentially performs polyphase filter channelization, channel selection setting and channel autocorrelation processing on the intermediate frequency analog broadband signal to obtain an autocorrelation signal; The synchronous control module is also used to receive the auto-correlation signal, pack the auto-correlation signal together and output it.

Further, the above quantization is 2-bit quantization processing.

Further, the synchronization control module realizes the control of the data acquisition module and the related processing module by providing the system clock, timing signal, control signal and system parameters to the data acquisition module and the related processing module.

Further, the above system parameters include delay compensation and phase compensation.

In order to achieve the above object, as another aspect of the present invention, the present invention provides a wideband multi-channel digital correlation receiving and processing system, including the above-mentioned wideband multi-channel digital correlation receiver, and also includes a storage module and a power supply module, wherein :

The storage module is connected with the synchronous control module, and is used to receive and store the status signals and complex correlation results of the packaged data acquisition module and related processing modules;

The power supply module is used to supply power to other modules of the whole broadband multi-channel digital correlation receiving and processing system.

The present invention also provides a broadband multi-channel digital correlation receiving method, which is realized by a broadband multi-channel digital correlation receiver including a synchronous control module, a data acquisition module and a correlation processing module, comprising the following steps:

Step 1, the synchronization control module sends instructions to the data acquisition module and related processing modules, and starts to input the intermediate frequency analog broadband signal collected from the radio imaging observation;

Step 2, the data acquisition module inputs the intermediate frequency analog broadband signal, and performs polyphase filter channelization processing and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized quadrature signal and an autocorrelation result;

Step 3, the correlation processing module receives the quantized quadrature signal, and performs a complex correlation operation on the quantized quadrature signal to obtain a complex correlation result;

Step 4: The synchronous control module receives the status signal and the complex correlation result of the data acquisition module and the related processing module, and outputs the received status signal and complex correlation result after packaging.

Based on the above-mentioned technical scheme, it can be known that the broadband multi-channel digital correlation receiver and receiving method proposed by the present invention have the following beneficial effects:

(1) Multi-frequency channel observation and signal processing can be realized within the observation time, by using polyphase filter bank (Polyphase&FFT Filter Bank, PFFB) and cascaded half-band filter bank (Cascade Half Band Filter-bank: CHBF), Perform polyphase filter channelization processing on the intermediate frequency analog broadband signal, so that the bandwidth and center frequency point of the baseband signal to be observed can be flexibly selected, and the impact of radio interference from the external environment can be reduced at the same time;

(2) 2-bit quantization is carried out before the complex correlation operation of the quadrature baseband signal. Compared with 1-bit quantization, the correlation sensitivity of 2-bit quantization can be increased from 63.7% to 88.1%;

(3) by carrying out autocorrelation processing to the orthogonal baseband signal, when calculating and outputting the complex correlation result of the baseband signal, the autocorrelation power value of the baseband signal can be obtained, so the broadband multi-channel digital correlation receiver proposed by the present invention also has Basic functions of broadband radio spectrum analyzer.

Description of drawings

Figure 1 is the data acquisition-quantification part of the digital correlation receiver of the Nobeyama heliograph in Japan;

Figure 2 is the complex correlation processing part of the Japanese Nobeyama heliograph digital correlation receiver;

Fig. 3 is a schematic structural diagram of a broadband multi-channel digital correlation receiver proposed by an embodiment of the present invention;

Fig. 4 is a device diagram of the Ming'antu radio heliograph proposed by an embodiment of the present invention;

Fig. 5 is the signal processing flowchart of the wideband multi-channel digital correlation receiver proposed by an embodiment of the present invention;

Fig. 6 is a board device diagram of the data acquisition module in the broadband multi-channel digital correlation receiver proposed by an embodiment of the present invention;

Fig. 7 is a schematic diagram of installation of a wideband multi-channel digital correlation receiver proposed by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The Mingantu Spectral Radioheliograph (hereinafter referred to as MUSER) developed by the National Astronomical Observatory of China, which includes the wideband multi-channel digital correlation receiver component of the present invention, is for the first time in the centimeter-decimeter band (0.4GHz-15GHz ) to simultaneously observe the dynamic properties of solar eruptive activities with high spatial, high temporal and high frequency resolutions, and to detect the origin of solar violent activities. Based on the existing domestic instruments and equipment such as the solar radio broadband dynamic spectrum instrument and the solar magnetic field telescope with international advanced level, it fills the current international gap in the high-resolution radio imaging observation of the meter-band initial release of solar flare energy, and strives to provide Important original research achievements in physics research have made my country's research in the fields of solar activity detection and research and solar activity's impact on the earth enter the international advanced ranks, and promoted my country's research in radio physics, plasma physics, and geophysics. and the development of space science, aviation, aerospace and other disciplines.

The following is the performance comparison table between Mingantu radio spectrum heliograph and other heliographs:

The wideband multi-channel digital correlation receiver in the Ming Antu radioheliograph is its core component. Its main function is to receive and collect wideband intermediate frequency signals from the analog backend of all antennas, and channelize and 2-bit quantize the signals and complex correlation processing, the output results are complex correlation output and autocorrelation output between different antennas in each baseband.

Specifically, the broadband multi-channel digital correlation receiver disclosed in the present invention used in the Ming'antu radio heliograph includes:

The data acquisition module is used to input the intermediate frequency analog broadband signal from radio imaging observation and collection, and perform polyphase filter channelization processing and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized orthogonal signal;

The correlation processing module is used to receive the quantized quadrature signal output by the data acquisition module, and perform a complex correlation operation on the quantized quadrature signal to obtain a complex correlation result;

The synchronous control module is used to receive the status signal and the complex correlation result of the data acquisition module and the related processing module, and output the received status signal and complex correlation result after packaging.

Preferably, the above-mentioned data collection module has multiple intermediate frequency input channels for inputting intermediate frequency analog broadband signals from multiple antennas collected by radio imaging observations.

The above polyphase filter channelization is completed by polyphase filter banks and cascaded half-band filter banks. Polyphase filter banks are used to channelize intermediate frequency analog broadband signals to obtain orthogonal baseband signals; cascaded half-band filter banks Groups are used to convert the quadrature baseband signal into a series of quadrature baseband signals dropped at 2x the bandwidth.

The above quadrature baseband signal is quantized to obtain a quantized quadrature signal.

Preferably, the processing of the above-mentioned intermediate frequency analog broadband signal further includes: channel selection setting, which is used to output an orthogonal baseband signal of a certain fixed bandwidth for multiple channels according to observation needs. When selecting the bandwidth, the channel of the center frequency point without interference can be selected according to the results of environmental radio interference monitoring for output and subsequent quantization related processing, so that the impact of external radio interference can be minimized.

Preferably, the processing of the above-mentioned intermediate frequency analog broadband signal also includes autocorrelation processing, and the data acquisition module sequentially performs polyphase filter channelization, channel selection setting and channel autocorrelation processing on the intermediate frequency analog broadband signal to obtain an autocorrelation signal; The synchronous control module is also used to receive the auto-correlation signal, pack the auto-correlation signal together and output it.

Preferably, the above quantization is a 2-bit quantization process.

The synchronization control module realizes the control of the data acquisition module and the related processing module by providing the system clock, timing signal, control signal and system parameters to the data acquisition module and the related processing module.

Preferably, the above system parameters include delay compensation and phase compensation.

Based on the above-mentioned broadband multi-channel digital correlation receiver, the present invention also discloses a wide-band multi-channel digital correlation receiving and processing system, which includes the above-mentioned wide-band multi-channel digital correlation receiver, and also includes a storage module and a power supply module, wherein:

The storage module is connected with the synchronous control module, and is used to receive and store the status signals and complex correlation results of the packaged data acquisition module and related processing modules;

The power supply module is used to supply power to other modules of the whole broadband multi-channel digital correlation receiving and processing system.

The invention also discloses a broadband multi-channel digital correlation receiving method, which is realized by a broadband multi-channel digital correlation receiver including a synchronous control module, a data acquisition module and a correlation processing module, including the following steps:

Step 1, the synchronization control module sends instructions to the data acquisition module and related processing modules, and starts to input the intermediate frequency analog broadband signal collected from the radio imaging observation;

Step 2, the data acquisition module inputs the intermediate frequency analog broadband signal, and performs polyphase filter channelization processing and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized quadrature signal and an autocorrelation result;

Step 3, the correlation processing module receives the quantized quadrature signal, and performs a complex correlation operation on the quantized quadrature signal to obtain a complex correlation result;

Step 4: The synchronous control module receives the status signal and the complex correlation result of the data acquisition module and the related processing module, and outputs the received status signal and complex correlation result after packaging.

Among them, the device used in the data acquisition module to realize the input of the intermediate frequency analog broadband signal is an analog-to-digital converter with a sampling rate higher than 1Gsps and a quantization bit width ≥ 8 bits, such as the EV10AQ190 produced by E2V Company; The device for the channelization processing and quantization processing functions of the phase filter is an FPGA chip, such as the Stratix III EP3S260 FPGA chip of ALTERA Company.

The wideband multi-channel digital correlation receiver and receiving method proposed by the present invention will be described in detail below through specific embodiments.

Example

As shown in Figure 3, this embodiment proposes a wideband multi-channel digital correlation receiver, including:

The data acquisition module is used to input the intermediate frequency analog broadband signal from radio imaging observation and acquisition, and sequentially perform polyphase filter channelization processing, channel selection setting and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized orthogonal signal; The broadband signal is sequentially processed by polyphase filter channelization, channel selection setting and channel autocorrelation processing to obtain an autocorrelation result;

A correlation processing module, connected with the data acquisition module, is used to receive the quantized quadrature signal, and perform complex correlation operation on the quantized quadrature signal to obtain a complex correlation result;

The synchronous control module is connected with the data acquisition module and the relevant processing module for control, and is used to receive the status signal, the complex correlation result and the autocorrelation result of the data acquisition module and the relevant processing module, and the received status signal, complex correlation result and The autocorrelation results are packed and output.

Polyphase filter channelization is accomplished through polyphase filter banks and cascaded half-band filter banks. Polyphase filter banks are used to channelize intermediate frequency analog broadband signals to obtain orthogonal baseband signals; cascaded half-band filter banks It is used to convert the quadrature baseband signal into a series of quadrature baseband signals that are reduced by twice the bandwidth; the quadrature baseband signal is quantized to obtain a quantized quadrature signal.

The channel selection setting is used to output an orthogonal baseband signal with a certain fixed bandwidth for multiple channels according to the observation needs.

Based on the above-mentioned broadband multi-channel digital correlation receiver, this embodiment also proposes a broadband multi-channel digital correlation receiving and processing system, including the above-mentioned wide-band multi-channel digital correlation receiver, and also includes a storage module and a power supply module, wherein:

The storage module is connected with the synchronous control module, and is used to receive and store the state signals, complex correlation results and autocorrelation results of the packaged data acquisition module and related processing modules;

The power supply module is used to supply power to other modules of the whole broadband multi-channel digital correlation receiving and processing system.

Here, taking the Ming Antu radio heliograph as an example, the broadband multi-channel digital correlation receiver and the broadband multi-channel digital correlation receiving and processing system of this embodiment are described in detail. The main function of the broadband multi-channel digital correlation receiver is to receive and collect All antennas (MUSER-I array 40 antennas, MUSER-H array 60 antennas) simulate the broadband intermediate frequency signal (bandwidth is 400MHz) at the back end, and channelize the signal, 2-bit quantization and complex correlation processing, the output results are different Complex correlation output and autocorrelation output between antennas in each baseband.

In MUSER-I and MUSER-H array systems, digital correlation receivers MDCR-I and MDCR-H independently realize the above functions. Because the system architectures of the two systems are similar, only the technical solution of MDCR-I is described here. The device composition of the Ming Antu radio heliograph is shown in Figure 4, including:

The data acquisition (DIG) module inputs the intermediate frequency analog broadband signal (bandwidth 400MHz), and outputs the quantized quadrature signal after 2-bit quantization to the relevant processing module. The DIG module consists of 6 boards, marked as DIG-1~DIG-6, among which DIG-6 is the spare board. Each DIG board has 8 analog IF input channels, each receiving channel digitally samples the analog broadband signals (50MHz~450MHz) from the front-end 8 antennas at a sampling rate of 1GSPS, and performs 16 analog broadband signals on each channel Orthogonal channelization of the channel, after obtaining the baseband quadrature signal (I, Q), perform 2-bit quantization on it, and output the 2-bit quantized quadrature baseband signal to a related processing module.

The correlation processing (COR) module inputs the 2-bit quantized quadrature signal from the DIG module, performs complex correlation calculation, and outputs the complex correlation calculation result to the synchronization control module. The COR module consists of 4 boards, marked as COR-1~COR-4. Each COR board uses 32 sets of signal lines to receive quantized quadrature baseband signals from different DIG boards (input data bandwidth is about 25.6Gbps), performs complex correlation operations on the quantized quadrature signals of the same baseband of different antennas, and The complex correlation results are output through 4 sets of signal lines (the output data bandwidth is about 64Mbps).

Synchronous control (SYN) module, used to control the input/output of DIG module and COR module, has three main functions: 1. Provide system clock and timing signal for DIG module and COR module; 2. Transmission system to DIG module and COR module Control signals and system parameters (such as delay compensation and phase compensation); 3. Receive the complex correlation results from the COR module, the autocorrelation results from the DIG module, the status information data of the DIG module and the COR module, and package them as the final output sent to the storage module.

The DIG module, the COR module and the SYN module provide a data exchange channel through a data communication (COM) module. The COM module is designed as a backplane with 13 data slots, and its main function is to provide high-speed data channels for data communication between 8 DIG boards, 4 COR boards and 1 SYN board. On the COM module backplane, the slot designs of the 8 DIG boards are uniform and equal; the slot designs of the 4 COR boards are uniform and equal. Data slots are interchangeable between peer boards.

The signals labeled ①～⑥ in Figure 4 are described as follows:

①, the analog signal from the antenna to the DIG module, the bandwidth is 400MHz;

②. Clock and timing control signals from SYN module board to DIG module board and COR module board;

③. The 2-bit quantized quadrature signal output by the DIG module board is used as the input of the COR module board;

④. The bidirectional data bus from the SYN module board to the DIG module board and the COR module board, transmits control commands and returned status information;

⑤. The relevant result data output by the COR module board is used as the data input of the SYN module board;

⑥. The data frame output by the SYN module board for the complex correlation result data and other system information is transmitted to the data storage unit through the high-speed data bus.

Fig. 5 is the signal processing flowchart of the broadband multi-channel digital correlation receiver that present embodiment proposes, mainly described the processing to the broadband signal from single antenna: first high-speed analog-to-digital converter (ADC, sampling rate 1Gsps) is to 400MHz The wideband signal (50-450MHz) is sampled, and the sampled digital signal enters the polyphase filter bank PFFB after delay adjustment. PFFB channelizes the digital signal with a bandwidth of 400MHz to obtain an initial bandwidth of 25MHz. 16 channels of orthogonal baseband signals I, Q evenly distributed within the bandwidth of 50 ~ 450MHz. Each baseband signal passes through the cascaded half-band filter bank CHBF after phase compensation. CHBF outputs a series of quadrature baseband signals with twice the bandwidth for each 25MHz bandwidth baseband signal: 12.5MHz, 6.25MHz, 3.125 MHz, 1.5625MHz. These orthogonal baseband signals of different bandwidths pass through the channel bandwidth selector (Channel Bandwidth Selector, CBS), and the CBS will output a fixed bandwidth baseband signal (25MHz by default) for all channels according to actual observation needs, and then the quantizer ( Two-bitQuantizer, TQ) performs 2-bit quantization on the 16-channel fixed-bandwidth baseband signal, and the output 2-bit orthogonal baseband signal enters the complex correlator (Complex Multiplier–Accumulator, CMAC). The complex correlation results between. In addition, the orthogonal baseband signal output by the CBS also enters a channel autocorrelator (ChannelAuto-Correlator, CAC), and the CAC calculates the autocorrelation (power) result of each baseband channel. Finally, the complex correlation results of the same baseband channel of different antennas and the autocorrelation results of all baseband channels of each antenna are used as the main data, and are packaged together with other parameters (Data Packager: DP) as output data frames and transmitted to the storage unit.

Therefore, most of the digital signal processing algorithms for the relevant data required by MDCR for solar radio imaging are implemented in the DIG module, including polyphase filter channelization (PFFB), channel selection settings (CHBF&CBS), and 2-bit quantization of broadband signals. (TQ) and channel autocorrelation (CAC), the main function of the COR module is to perform complex correlation operation (CMAC) on the 2-bit quantized orthogonal baseband signal.

Among them, each board of the DIG module has exactly the same structure and components. The function of high-speed analog/digital conversion module is realized by EV10AQ190 produced by E2V Company. The single-chip EV10AQ190 includes 4 channels, the single-channel sampling rate can reach 1.25Gsps, and the quantization bit width is 10bits; the functions of delay adjustment and phase compensation, PFFB, CHBF, CBS, Quantizer and CAC are in the high-performance FPGA produced by ALTERA— Stratix III EP3S260 internal programming.

Specifically, the front-end analog broadband signal (50MHz~450MHz) becomes 16 digital quadrature baseband signals with a bandwidth of 25MHz after high-speed data acquisition and PFFB; further, each baseband signal can be obtained separately according to different taps after passing through CHBF Wideband signals with bandwidths of 12.5MHz, 6.25MHz, 3.125MHz and 1.5625MHz. Taking the 1.5625MHz broadband signal as an example, there are 256 center frequency points in the 400MHz bandwidth. When selecting the bandwidth, the channel of the center frequency point without interference can be selected according to the environmental radio interference monitoring results for output and subsequent quantization related processing, which can minimize the impact of external radio interference.

As shown in Figure 6, it is the circuit board layout of the DIG module data acquisition board in this embodiment. As can be seen from Figure 6, each data acquisition board includes two ATMEL e2v10aq190 high-speed analog/digital conversion chips and two ALTERAStratixIII E260 programmable logic chip. Among them, each piece of ATMEL completes the data acquisition of 4 channels of analog broadband signals; ALTERA StratixIII realizes the channelization, bandwidth selection and 2-bit orthogonal quantization processing of digital signals. The entire acquisition card realizes data acquisition and channelization processing of 8 channels of analog broadband signals.

Figure 7 is a schematic diagram of the installation and integration of the broadband multi-channel digital correlation receiver proposed in this embodiment in a 19-inch cabinet, as shown in the figure: the digital correlation receiver is located above the cabinet, including the DIG module, the SYN module and the COR module All the boards are connected to the communication motherboard through VPX slots and installed in a 14U chassis. Four fan trays are installed in the top space of the digital receiving and processing unit for heat dissipation. In order to increase heat dissipation efficiency, a space for fan tray installation is reserved at the bottom. The digital unit storage server and storage array are located in the middle (size 3U) and lower part (size 16U) of the 19-inch cabinet, and are connected through optical fibers and digital receiving and processing unit modules.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

Claims (9)

1. A wideband multi-channel digital correlation receiver, characterized in that it comprises: The data acquisition module is used to input the intermediate frequency analog broadband signal from radio imaging observation and collection, and perform polyphase filter channelization processing and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized orthogonal signal; A correlation processing module, configured to receive the quantized quadrature signal output by the data acquisition module, and perform a complex correlation operation on the quantized quadrature signal to obtain a complex correlation result; A synchronous control module, configured to receive the state signal and the complex correlation result of the data acquisition module and the related processing module, and output the received state signal and the complex correlation result after packaging, Wherein, the channelization of the polyphase filter is completed by a polyphase filter bank and a cascaded half-band filter bank, and the polyphase filter bank channelizes the intermediate frequency analog broadband signal to obtain a plurality of orthogonal baseband signals, so The cascaded half-band filter bank described above is used to convert the quadrature baseband signal into a series of quadrature baseband signals dropped by 2 times the bandwidth, including: The sampled digital signal enters the polyphase filter bank after delay adjustment, and the polyphase filter bank channels the digital signal to obtain multiple orthogonal baseband signals; each baseband signal enters the stage directly after phase compensation. A half-band filter bank is connected, and the cascaded half-band filter bank filters each baseband signal and outputs a series of orthogonal baseband signals that are reduced by twice the bandwidth. 2. broadband multi-channel digital correlation receiver as claimed in claim 1, is characterized in that, described data acquisition module has a plurality of intermediate frequency input channels, is used for inputting the intermediate frequency analog broadband signal from a plurality of antennas that radio imaging observation gathers . 3. The wideband multi-channel digital correlation receiver according to claim 1, wherein the quantized quadrature signal is obtained after the quadrature baseband signal is subjected to the quantization process. 4. wideband multi-channel digital correlation receiver as claimed in claim 1, is characterized in that, the processing that described intermediate frequency analog broadband signal is carried out also comprises: channel selection is set, for according to observation needs, to described multi-channel output Orthogonal baseband signals of fixed bandwidth. 5. wideband multi-channel digital correlation receiver as claimed in claim 4, is characterized in that, the processing that described intermediate frequency analog broadband signal is carried out also comprises autocorrelation processing, and described data acquisition module is sequential to described intermediate frequency analog broadband signal After performing polyphase filter channelization, channel selection setting and channel autocorrelation processing, an autocorrelation signal is obtained; the synchronization control module is also used to receive the autocorrelation signal, and output the autocorrelation signal together after packaging . 6. The wideband multi-channel digital correlation receiver according to claim 1, wherein said quantization is a 2-bit quantization process. 7. wideband multi-channel digital correlation receiver as claimed in claim 1, is characterized in that, described synchronous control module is by providing system clock, sequence signal, control signal and system parameter to described data acquisition module and relevant processing module, Controlling the data acquisition module and related processing modules; the system parameters include delay compensation and phase compensation parameters. 8. A wide-band multi-channel digital correlation receiving and processing system is characterized in that it comprises the wide-band multi-channel digital correlation receiver as claimed in any one of claims 1 to 7, and also includes a storage module and a power supply module, wherein : A storage module, connected to the synchronous control module, used to receive and store the state signals and complex correlation results of the data acquisition module and related processing modules after packaging; The power supply module is used to supply power to other modules of the whole broadband multi-channel digital correlation receiving and processing system. 9. A broadband multi-channel digital correlation receiving method, comprising the following steps: Step 1, the synchronization control module sends instructions to the data acquisition module and related processing modules, and starts to input the intermediate frequency analog broadband signal collected from the radio imaging observation; Step 2, the data acquisition module inputs the intermediate frequency analog broadband signal, and performs polyphase filtering channelization processing and quantization processing on the intermediate frequency analog broadband signal to obtain a quantized quadrature signal and an autocorrelation result; Step 3, the correlation processing module receives the quantized quadrature signal, and performs a complex correlation operation on the quantized quadrature signal to obtain a complex correlation result; Step 4: The synchronization control module receives the status signals of the data acquisition module and the correlation processing module and the complex correlation results, and outputs the received status signals and complex correlation results after packaging.