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Two-dimensional planar array digital beam forming method based on FPGA

A digital beam and two-dimensional plane technology, which is applied in the field of FPGA-based two-dimensional planar array digital beamforming, can solve the problems of large amount of inverse calculation of sampling matrix covariance, increased calculation delay, and affecting the real-time performance of radar data. Achieve the effect of increasing data throughput, improving resource utilization, and reducing resource consumption

Active Publication Date: 2020-10-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Claims
  • Application Information

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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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  • Two-dimensional planar array digital beam forming method based on FPGA
  • Two-dimensional planar array digital beam forming method based on FPGA
  • Two-dimensional planar array digital beam forming method based on FPGA

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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 particularly relates to a two-dimensional planar array digital beam forming method based on an FPGA. The invention providesan FPGA-based two-dimensional planar array digital beam forming method aiming at the condition of large-scale array and overlarge operation amount of sampling matrix covariance inversion (SMI), and the method is based on iterative solution weight of a conjugate gradient algorithm (CG) and is implemented by FPGA-based hardware so as to improve the real-time performance of 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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IPC IPC(8): H04B7/06G01S13/02G01S7/02
CPCG01S7/02G01S13/02G01S2013/0245H04B7/0617
Inventor 宗竹林罗杰
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA