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Space radiation source DOA estimation method based on non-orthogonal decomposition

An angle of arrival, non-orthogonal technology, applied to direction finders using radio waves, radio transmission systems, electrical components, etc., can solve system applications such as communication, radar, sonar, signal-to-noise ratio, array error Issues such as strict environmental requirements related to information sources, etc., to achieve the effect of high estimation accuracy, low related environmental requirements, and reduced errors

Inactive Publication Date: 2006-12-20
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, communication, radar and other equipment using the existing angle of arrival estimation method have strict requirements on signal-to-noise ratio, array error, and source-related environment, which greatly hinders the practical application of communication, radar, sonar and other systems

Method used

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  • Space radiation source DOA estimation method based on non-orthogonal decomposition
  • Space radiation source DOA estimation method based on non-orthogonal decomposition
  • Space radiation source DOA estimation method based on non-orthogonal decomposition

Examples

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Embodiment 1

[0025] A method for estimating the angle of arrival of a space radiation source based on non-orthogonal decomposition, its steps include forming an antenna array with M antenna elements distributed in space to receive the signal of a space radiation source, collecting the data vector X on the antenna element, and then In the digital processing module, the data vector collected is processed, and the angle of arrival of the space radiation source signal is estimated and output. It is characterized in that: the specific method of processing the data collected by the antenna array element is:

[0026] a. Construct a non-orthogonal overcomplete atomic vector library G:

[0027] The formula for the atomic vector g is: g = e j ω 0 t 1 · ...

Embodiment 2

[0048] This embodiment is basically the same as Embodiment 1, except that M=10 in this example, that is, a uniform antenna array is composed of 10 antenna elements, the distance between the elements is d=0.04m, and signals from space radiation sources are received. A space radiation source emits a center frequency f 0 =3.5GHz is ω 0 =7π*10 9 The signal incident on the antenna array is at an angle of 10.43 degrees; that is, the angle of arrival at the antenna array is 10.43 degrees.

[0049] At this time, the formula for calculating the non-orthogonal overcomplete atomic vector g becomes:

[0050] g = e j ( 6 π * 10 9 t ) 1 exp ...

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Abstract

The invention relates to a spatial radiation source reach angle estimate method, based on non-orthogonality decomposition, wherein the method that treating the antenna array collected data comprises: based on the carrier frequency of spatial radiation source signal, the character of antenna array and the formula of atom vector g, building the non-orthogonality over-maturity atom vector base G; then matching the data vector X received by antenna array in the non-orthogonality over-maturity atom base G; projecting the data received by antenna array in the non-orthogonality over-maturity atom base G, to select the atom vector with maximum projected component as the optimized atom vector; said spatial reach angle parameter theta of said optimized atom vector is the estimated value of spatial radiation source reach angle. The invention has high accuracy, the application in low signal / noise rate, and non-sensitive to the antenna array error, with low calculation consumption.

Description

Technical field [0001] The invention relates to the technical field of estimation of incoming wave parameters of space radiation sources, in particular to a method for estimating arrival angles of incoming waves of space radiation sources. Background technique [0002] Estimation of incoming wave parameters of space radiation sources, such as incoming wave angle of arrival, has a wide range of applications in the fields of radio communication, radar, sonar, seismic detection, navigation, and medicine, and has always been a key technology used in communication, radar, and sonar equipment. After years of in-depth research and development, the estimation method of angle of arrival has been developed rapidly. Now, there are mainly two types of methods: MUSIC (Multiple Signal Classification) algorithm and ESPRIT (Estimation of Parameters with Rotation Invariant Technique) algorithm. The core of the MUSIC method is to project the array received data into two subspaces---the signa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H01Q21/00G01S3/02
Inventor 王建英尹忠科陈磊
Owner SOUTHWEST JIAOTONG UNIV
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