Adaptive data rate extraction module in digital beam forming chip

Abstract

The invention relates to a self-adaptive data rate extraction module in a digital beam forming chip, which comprises a frequency shift module (1) for shifting an input broadband beam frequency; the extraction module (2) is used for carrying out high-data-rate down-sampling extraction on the broadband wave beam after frequency shift; the compensation module (3) is used for compensating sideband amplitude distortion of the extracted time domain signal and further performing down-sampling extraction on the broadband wave beam at the same time; the filtering module (4) is used for filtering out unwanted high-frequency signals in the broadband wave beam, and further performing down-sampling extraction on the broadband wave beam to finally obtain a required narrowband wave beam; and the parameter configuration module (5) is used for receiving the processing parameters of each frame in real time, performing parameter configuration for each module, controlling the starting and operation of each module, and outputting the processed frame count in real time. According to the digital beam forming chip, the adaptive data rate extraction module adaptively extracts broadband beams to form a plurality of narrow-band beams, and the simultaneous multifunctional application requirement of the chip is met.

Description

Technical Field

[0001] The invention relates to the field of radar signal processing, and in particular to an adaptive data rate extraction module in a digital beamforming chip. Background Art

[0002] Digital beamforming systems need to form different types of broadband and narrowband beams to meet the needs of multi-functional applications. Due to the different processing methods of wide and narrow beam synthesis, digital beamforming systems generally use two methods in specific engineering implementations. One is to form broadband or narrowband beams in time-sharing; the other is to use two systems to process them separately. Comparing the above two methods, method one cannot meet the requirements of simultaneous multi-functional applications. Although method two meets the requirements of simultaneous multi-functional applications, the system resources and costs are more than doubled. Therefore, a simultaneous wide and narrowband beam synthesis method and module are urgently needed to meet the above requirements. Summary of the invention

[0003] In order to solve the existing technical problems, the present invention provides an adaptive data rate extraction module in a digital beamforming chip.

[0004] The specific content of the present invention is as follows: An adaptive data rate extraction module in a digital beamforming chip, comprising: A frequency shift module (1) shifts the frequency of the input broadband beam; An extraction module (2) performs downsampling and extraction of the high data rate of the broadband beam after the frequency shift; A compensation module (3) is used to compensate for the amplitude distortion of the time domain signal sideband after decimation, and to further downsample the broadband beam; A filtering module (4) filters out unnecessary high-frequency signals in the broadband beam and further downsamples the broadband beam to finally obtain the desired narrowband beam; The parameter configuration module (5) receives the processing parameters of each frame in real time, configures the parameters for each of the above modules, controls the startup and operation of each module, and outputs the processed frame count in real time.

[0005] Furthermore, after the frequency shift module (1) shifts the input broadband beam frequency, it ensures that the broadband beam zero frequency position corresponds to the narrowband beam center frequency to be selected.

[0006] Furthermore, the frequency shift component of the frequency shift module (1) is dynamically configurable.

[0007] Furthermore, the extraction module (2) performs multi-stage cascade processing on the integral and comb operations, and its extraction ratio and cascade order are dynamically configurable in real time.

[0008] Furthermore, the compensation coefficient and decimation ratio of the compensation module (3) are dynamically configurable.

[0009] Furthermore, the filter coefficient and decimation ratio of the filter module (4) are dynamically configurable.

[0010] Furthermore, the working process of the adaptive data rate extraction module includes: when a frame of broadband beam data arrives, the parameter configuration module (5) parses the control table, and gives the configuration parameters required by modules (1) to (4) according to the center frequency position, bandwidth and data rate of the narrowband beam to be extracted; The frequency shift module (1) generates a reference clock according to the frequency shift component f_shift parameter, mixes the input broadband beam data with the reference clock, and sends the frequency shift result to the extraction module (2); The extraction module (2) performs integration and comb operations on the output result of the frequency shift module (1) according to the extraction ratio D1 and the cascade order N parameter, and then performs D1 times extraction, and the extraction result is sent to the compensation module (3); The compensation module (3) selects and extracts the decimation factor D2 parameter according to the compensation coefficient sel_h1, convolves the output result of the extraction module (2) with the compensation coefficient value, and then extracts D2 times, and the compensation result is sent to the filtering module (4); The filter module (4) selects and extracts the magnification D3 parameter according to the filter coefficient sel_h2, convolves the output result of the compensation module (3) with the filter coefficient value, and then extracts D3 times, finally obtaining the required narrowband beam.

[0011] The adaptive data rate extraction module in the digital beam forming chip of the present invention adaptively extracts a broadband beam to form multiple narrowband beams, thereby realizing the multi-functional application requirements of the chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The specific implementation of the present invention will be further explained below in conjunction with the accompanying drawings.

[0013] Figure 1 Schematic diagram of the adaptive data rate extraction module in the digital beamforming chip. DETAILED DESCRIPTION

[0014] Combination Figure 1 The present invention provides an adaptive data rate extraction module in a digital beamforming chip, comprising: The frequency shift module 1 is used for broadband beam frequency shifting to ensure that the zero frequency position corresponds to the narrowband beam center frequency to be selected. The module frequency shift component is dynamically configurable.

[0015] The extraction module 2 is used for downsampling and extraction of high data rate of broadband beam after frequency shifting. In order to further suppress out-of-band side lobes, multi-stage cascade processing is performed on the integration and comb operations. The module extraction ratio and cascade order are dynamically configurable in real time.

[0016] The compensation module 3 is used to compensate for the amplitude distortion of the time domain signal sideband after decimation, and further downsample and extract the broadband beam. The module compensation coefficient and decimation ratio are dynamically configurable.

[0017] The filter module 4 is used to filter out unnecessary high-frequency signals in the broadband beam, and further downsample the broadband beam to finally obtain the required narrowband beam. The module filter coefficient and decimation ratio are dynamically configurable.

[0018] The parameter configuration module 5 receives the processing parameters of each frame in real time, configures the parameters for the above modules, controls the startup and operation of each module, and outputs the processed frame count in real time.

[0019] The implementation method and steps of this module are as follows: a. When a frame of broadband beam data arrives, the parameter configuration module 5 parses the control table and gives the configuration parameters required by the frequency shift module 1, extraction module 2, compensation module 3 and filtering module 4 according to the center frequency position, bandwidth and data rate of the narrowband beam to be extracted.

[0020] b. The frequency shift module 1 generates a reference clock according to the frequency shift component (f_shift) parameter, mixes (complex multiplies) the input broadband beam data with the reference clock, and sends the frequency shift result to the extraction module 2.

[0021] c. The extraction module 2 integrates and combs the output result of the frequency shift module 1 according to the extraction ratio (D1) and the cascade order (N) parameters, and then performs D1 times extraction. The extraction result is sent to the compensation module 3.

[0022] d. Compensation module 3 convolves the output result of extraction module 2 with the compensation coefficient value according to the compensation coefficient (sel_h1) and the decimation ratio (D2) parameters, and then performs D2-fold decimation. The compensation result is sent to filtering module 4.

[0023] e. The filter module 4 convolves the output result of the compensation module 3 with the filter coefficient value according to the filter coefficient (sel_h2) and the decimation ratio (D3) parameters, and then performs D3 times decimation to finally obtain the required narrowband beam.

[0024] Combination Figure 1 , a specific embodiment of the present invention is as follows: Taking the module's current input broadband beam data rate of 240MHz as an example, it is necessary to extract a narrowband beam with a center frequency of 10MHz, a bandwidth of 0.625M, and a data rate of 2MHz.

[0025] The parameter configuration module 5 analyzes the control table and obtains the frequency shift component f_shift=10MHz of the frequency shift module 1; the extraction ratio D1=30 and the cascade N=5 of the extraction module 2; the compensation coefficient of the compensation module 3 is sel_h1=5 and the extraction ratio D2=2; the filter coefficient of the filter module 4 is sel_h1=9 and the extraction ratio D3=2. The processing steps are as follows: a. The frequency shift module 1 generates a 10 MHz reference clock and multiplies it with the input data; b. Compensation module 2 performs integration and comb operations on the input data with a 30-order delay length, and then performs 30-fold rate extraction after 5-stage cascade processing; c. The compensation module 3 reads the fifth set of compensation coefficient values, convolves them with the input data, and then performs 2x decimation; d. Filter module 4 reads the 9th set of filter coefficient values, convolves them with the input data, and then performs 2x decimation to finally obtain the required narrowband beam.

[0026] The adaptive data rate extraction module in the digital beamforming chip of the present invention adopts a frequency shift module to realize accurate extraction of a broadband beam to a narrowband beam; three-level extraction and two-level filtering processing are adopted in the extraction module, the compensation module and the filtering module to realize high-bandwidth data rate downsampling, and effectively reduce the amplitude distortion of the time domain signal sideband and suppress out-of-band signals; at the same time, through parameterized configuration, the chip has strong versatility: it supports adaptive extraction of any signal bandwidth and data rate.

[0027] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An adaptive data rate extraction module in a digital beamforming chip, characterized in that: include: A frequency shift module (1) shifts the frequency of the input broadband beam; An extraction module (2) performs downsampling and extraction of the high data rate of the broadband beam after the frequency shift; A compensation module (3) is used to compensate for the amplitude distortion of the time domain signal sideband after extraction, and to further downsample and extract the broadband beam; A filtering module (4) filters out unnecessary high-frequency signals in the broadband beam and further downsamples the broadband beam to finally obtain the desired narrowband beam; The parameter configuration module (5) receives the processing parameters of each frame in real time, configures the parameters for each of the above modules, controls the startup and operation of each module, and outputs the processed frame count in real time.

2. The adaptive data rate extraction module in the digital beamforming chip according to claim 1, characterized in that: The frequency shift module (1) shifts the input broadband beam frequency to ensure that the broadband beam zero frequency position corresponds to the narrowband beam center frequency to be selected.

3. The adaptive data rate extraction module in the digital beamforming chip according to claim 1, characterized in that: The frequency shift component of the frequency shift module (1) is dynamically configurable.

4. The adaptive data rate extraction module in the digital beamforming chip according to claim 1, characterized in that: The extraction module (2) performs multi-stage cascade processing on the integral and comb operations, and its extraction ratio and cascade order are dynamically configurable in real time.

5. The adaptive data rate extraction module in the digital beamforming chip according to claim 1, characterized in that: The compensation coefficient and decimation ratio of the compensation module (3) are dynamically configurable.

6. The adaptive data rate extraction module in the digital beamforming chip according to claim 1, characterized in that: The filter coefficient and decimation ratio of the filter module (4) are dynamically configurable.

7. The adaptive data rate extraction module in the digital beamforming chip according to claim 1, characterized in that: The working process of the adaptive data rate extraction module includes: when a frame of broadband beam data arrives, the parameter configuration module (5) parses the control table and gives the configuration parameters required by modules (1) to (4) according to the center frequency position, bandwidth and data rate of the narrowband beam to be extracted; The frequency shift module (1) generates a reference clock according to a frequency shift component f_shift parameter, mixes the input broadband beam data with the reference clock, and sends the frequency shift result to the extraction module (2); The extraction module (2) performs integration and comb operations on the output result of the frequency shift module (1) according to the extraction ratio D1 and the cascade order N parameter, and then performs D1 times extraction, and the extraction result is sent to the compensation module (3); The compensation module (3) selects and extracts the decimation factor D2 parameter according to the compensation coefficient sel_h1, convolves the output result of the extraction module (2) with the compensation coefficient value, and then extracts D2 times, and the compensation result is sent to the filtering module (4); The filter module (4) selects and extracts the magnification D3 parameter according to the filter coefficient sel_h2, convolves the output result of the compensation module (3) with the filter coefficient value, and then extracts D3 times, finally obtaining the required narrowband beam.

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