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One-dimensional DOA estimation method by utilizing secondary virtual extension of multi-frequency signal

A multi-frequency signal and signal technology, applied in direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve problems affecting degrees of freedom and high requirements for array design

Active Publication Date: 2019-08-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-uniform arrays have high requirements for array design, and the choice of different structures greatly affects the actual degree of freedom

Method used

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  • One-dimensional DOA estimation method by utilizing secondary virtual extension of multi-frequency signal
  • One-dimensional DOA estimation method by utilizing secondary virtual extension of multi-frequency signal
  • One-dimensional DOA estimation method by utilizing secondary virtual extension of multi-frequency signal

Examples

Experimental program
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Embodiment 1

[0101] as attached Figure 5 As shown, the one-dimensional DOA estimation method based on multi-frequency transmission signals in this embodiment includes the following steps:

[0102] S1. Construct a multi-frequency signal time-domain data receiving model according to the structural characteristics of a one-dimensional uniform linear array used for one-dimensional DOA estimation, and use Fourier transform to obtain a multi-frequency signal frequency-domain data receiving model.

[0103] The one-dimensional uniform linear array structure for one-dimensional DOA estimation is as follows image 3 As shown, there are M array elements distributed on the line array, and the array element spacing is d. Assuming that the received signal is a transmitted signal composed of P narrowband signals of different frequencies and reflected by K sources and targets to the receiving array, the narrowband signal satisfies the narrowband condition, that is, when the signal delay is much smaller t...

Embodiment 2

[0177] This example discloses a high-precision one-dimensional direction of arrival estimation device based on multi-frequency combined signals, which is used as an implementation device for the one-dimensional DOA estimation method in the above embodiment, including a data processing and control module, a transmitting module, and a receiving module , output modules and power modules, such as figure 1 and figure 2 shown.

[0178] The data processing and control module is composed of a pair of A / D, D / A converter and a processor, which is the core part of the whole device, and all other modules are directly connected with it. It can control the transmitting module so that the transmitting module transmits the signal we specify; at the same time, it can process the signal transmitted by the receiving module, calculate the direction of arrival angle through the algorithm of the present invention, and then transmit the result to the output module.

[0179] The receiving module ...

Embodiment 3

[0185] This embodiment discloses a high-precision one-dimensional direction-of-arrival estimation device based on multi-frequency combined signals. The estimation device includes a data processing and control module, a transmitting module, a receiving module, an output module and a power supply module, such as figure 1 and figure 2 shown.

[0186] The data processing and control module can be implemented with a DSP chip (such as: DSP chip of TI company TMS320VC5509A type), this DSP chip can realize the functions of A / D conversion and D / A conversion, and can realize the rotation operator of three-dimensional uniform linear array and the calculation of the final direction of arrival;

[0187] In addition, the receiving module uses a fixed uniform linear array and the center frequencies of P groups are respectively {f 1 , f 2 ,..., f P} narrow-band filter, where each array includes multiple ultrasound receiving probes, and the number is the same, according to Figure 4 Ass...

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Abstract

The invention discloses a one-dimensional DOA estimation method by utilizing secondary virtual extension of a multi-frequency signal. The estimation method increases an array freedom degree based on auniform array structure, by utilizing the multi-frequency combination signal and by the secondary virtual extension. The method comprises the steps of transmitting multiple special-frequency narrow-band signals, separating time domain signals with corresponding frequency by a narrow-band filter at a receiving array element, obtaining a frequency domain receiving data model by fourier transformation, performing primary extension on a uniform physical array into a virtual nonuniform array by utilizing a frequency focusing technique and data covariance matrix reconstruction, and finally performing vectorization processing by combining the existing DOA estimation method based on a nonuniform array. The method realizes secondary virtual extension of the virtual nonuniform array, and obtains the final virtual uniform array. The method realizes secondary extension of an array aperture and increase of DOA estimation accuracy by the above technical means.

Description

technical field [0001] The invention relates to the technical field of target positioning, in particular to a one-dimensional direction-of-arrival estimation method for realizing secondary virtual array element expansion by using multi-frequency combined signals. Background technique [0002] Direction of arrival estimation (DOA estimation) has been widely used in many fields, and DOA estimation refers to the method of estimating the direction and angle of the source target by using array signal processing technology in space or placing sensor arrays. With the increasing complexity of the war environment, determining the AOA of target signals in various aspects such as target tracking and precision guidance, and conducting comprehensive surveillance and reconnaissance are the primary prerequisites for gaining the initiative in war. Therefore, it is of great significance to study super-resolution and high-precision DOA estimation technology. [0003] The array degree of free...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 宁更新姜伸接赵雪瑾
Owner SOUTH CHINA UNIV OF TECH
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