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Digital beam forming angle capturing method and device based on FFTc and storage medium

A technology of digital beam and acquisition device, applied in the field of signal processing, can solve the problems of huge increase in calculation amount, shortage of resources, large amount of calculation, etc.

Active Publication Date: 2020-10-23
CHENGDU FOURIER ELECTRONICS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Digital beamforming needs to know the direction of arrival (DOA, Direction of Arrival) of the signal before performing digital synthesis, and the existing DOA estimation method has a large amount of calculation. For example, MUSIC and other methods need to decompose the eigenvalue of the autocorrelation matrix and calculate The amount is O( N 3 ), the above method will increase the amount of computation as the number of sub-arrays increases, and when using FPGA to implement the MUSIC algorithm, it will face a serious shortage of resources

Method used

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  • Digital beam forming angle capturing method and device based on FFTc and storage medium
  • Digital beam forming angle capturing method and device based on FFTc and storage medium
  • Digital beam forming angle capturing method and device based on FFTc and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as figure 1 As shown, it is a flow chart of the FFTc-based digital beamforming angle acquisition method provided in this example.

[0052] It mainly includes the following steps:

[0053] Step 1. Set the length L of data accumulation and summation after Fourier transform. For the large angle error of one-time sampling data, the method of sampling and accumulating multiple times can reduce the influence of noise and system error on FFT;

[0054] Such as figure 2 as shown, figure 2 Comparing the results of one FFTc calculation with the results after 1024 accumulations, it can be seen that the influence of noise is obviously suppressed after accumulation.

[0055] Step 2, the data collected for N sub-arrays Perform Fourier transform by column to get the transformed data ,which is: .

[0056] Step 3, sum Sf column by column to get ,Right now .

[0057] Step 4, find the location of the maximum value in SΣ ;

[0058] The position P of the maximum valu...

Embodiment 2

[0067] Such as image 3 Shown is the FFTc-based digital beamforming angle acquisition device provided in this example.

[0068] The capturing device includes an accumulating module, an FFT module, a summing module, a maximum value module, a frequency deviation module and an angle module connected in sequence.

[0069] As the specific implementation means of the capture device in this example:

[0070] Specifically, the accumulation module is used to set the length L of multiple accumulation and summation of the data after the Fourier transform;

[0071] Specifically, the FFT module collects data from N subarrays Perform Fourier transform by column to get the transformed data ,which is: .

[0072] Specifically, the summation module is used to sum Sf column by column to obtain ,Right now .

[0073] Specifically, the maximum value module is used to calculate the position P of the maximum value from SΣ with 1 as the starting point, and the position P of the maximum va...

Embodiment 3

[0081] The present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is run by a processor, the device where the storage medium is located is controlled to execute the FFTc-based digital beamforming angle acquisition method .

[0082] The processor may be FPGA, CPU, DSP, ASIC, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.

[0083] A computer program comprises computer program code, which may be in source code form, object code form, executable file or some intermediate form or the like.

[0084] The computer-readable storage medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random memory Access memory (RAM, Random Access Memory), electrical carrier signa...

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Abstract

The invention discloses a digital beam forming angle capturing method and device based on FFTc and a storage medium. The method comprises the following steps: setting the length L of data subjected tomultiple times of accumulation summation after Fourier transform; performing Fourier transform on the data St acquired by the N sub-arrays according to columns to obtain Sf; summing the Sf accordingto columns to obtain Ssigma; finding out the position P of the maximum value in the Ssigma; calculating a frequency deviation value delta by using a modified FFT method; and mapping the frequency point information into angle information by utilizing the similarity between a discrete Fourier transform kernel function and a one-dimensional array signal steering vector model so as to calculate a target signal angle theta. The capturing device comprises an accumulation module, an FFT module, a summation module, a maximum value module, a frequency offset module and an angle module which are connected in sequence. The calculation amount of O (N3) can be reduced to O (NlogN), the calculation amount is remarkably reduced, the existing FFTip cores of Xilinx and Altera can be used for quick development, and the development difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of signal processing and relates to digital beamforming technology, in particular to an FFTc-based digital beamforming angle acquisition method and device. Background technique [0002] With the increasingly high requirements for airspace signal detection and parameter estimation, Digital Beam Forming (DBF, Digital Beam Forming) technology is rapidly developing as the main means of airspace processing. DBF technology is widely used in many fields, such as radar, communication, navigation, sonar and other fields. [0003] Digital beamforming needs to know the direction of arrival (DOA, Direction of Arrival) of the signal before performing digital synthesis, and the existing DOA estimation method has a large amount of calculation, such as MUSIC and other methods, which need to decompose the eigenvalue of the autocorrelation matrix and calculate The amount is O( N 3 ), the above method will increase the amount of comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F15/78
CPCG06F15/7817G06F2218/08Y02D30/70
Inventor 邹江波
Owner CHENGDU FOURIER ELECTRONICS TECH