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A fpga-based two-dimensional planar array digital beamforming method

A digital beam and two-dimensional planar technology, applied in the field of FPGA-based two-dimensional planar array digital beamforming, can solve the problem of large amount of inverse calculation of sampling matrix covariance, difficulty in ensuring low-delay characteristics of beams, and affecting real-time performance of radar data and other issues, to achieve the effect of improving the overall computing speed, improving resource utilization, and fast computing speed

Active Publication Date: 2021-07-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, as the size of the array increases, the amount of inversion of the covariance of the sampling matrix is ​​huge, and the calculation delay is increased. It is difficult to ensure the low delay characteristics of beamforming, which affects the real-time performance of radar data.

Method used

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  • A fpga-based two-dimensional planar array digital beamforming method
  • A fpga-based two-dimensional planar array digital beamforming method
  • A fpga-based two-dimensional planar array digital beamforming method

Examples

Experimental program
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Embodiment

[0103] In this example, the array has 4×4=16 array elements, and the covariance matrix The scale is 16×16. Flow input 16 element steering vectors and assign to internal registers. cache as the initial auxiliary vector p 1 , the cache RAM is recorded as RAM-p, and the initial w 0 =0. Enter covariance matrix estimates by row Addition tree structure to submodule 1. Enter the initial error threshold e. Start the iterative steps as follows.

[0104] Step 1: Calculate auxiliary vectors

[0105] Each clock cycle parallels 16 input matrix row elements, and the output auxiliary vector q i When outputting, it is buffered into RAM synchronously, which is recorded as RAM-q. Since it is a complex number, two RAM synchronization caches need to be called in parallel q i The real part and the imaginary part will be used in step c.

[0106] Step 2: Calculate the weight vector step size factor

[0107] Two-way parallel pipeline input auxiliary vector q i with the conjugat...

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Abstract

The invention belongs to the technical field of array signal processing, and in particular relates to an FPGA-based two-dimensional planar array digital beamforming method. In the case of large-scale arrays, the calculation amount of sampling matrix covariance inversion (SMI) is too large, and a two-dimensional planar array digital beamforming method based on FPGA is proposed. The method is based on the conjugate gradient algorithm (CG) The weights are solved iteratively, and the hardware implementation based on FPGA is implemented to improve the real-time performance of the operation.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, and in particular relates to an FPGA-based two-dimensional planar array digital beamforming method. Background technique [0002] The application of digital beamforming technology to phased array radar can improve the flexibility of beamforming and give full play to its advantages of multi-beam and anti-interference ability. The open-loop algorithm of sampling matrix covariance inversion (SMI) is often used for adaptive beamforming. However, as the size of the array increases, the amount of inversion of the covariance of the sampling matrix is ​​huge, and the calculation delay is increased. It is difficult to ensure the low-delay characteristics of beamforming, which affects the real-time performance of radar data. Contents of the invention [0003] In the case of large-scale arrays, the calculation amount of sampling matrix covariance inversion (SMI) is too large, and a beamfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06G01S13/02G01S7/02
CPCG01S7/02G01S13/02G01S2013/0245H04B7/0617
Inventor 宗竹林罗杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA