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Method for estimating two-dimensional direction-of-arrival of coherent signal source by means of L-shaped array based on time smoothing

A technology of time smoothing and direction estimation, applied in the field of radar, can solve problems affecting the estimation accuracy of direction of arrival, small amount of calculation, and reduction of array aperture, so as to ensure noise resistance and Lubang performance, avoid aperture loss, and improve Estimate the effect of ability

Active Publication Date: 2018-01-12
XIDIAN UNIV
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Problems solved by technology

Spatial smoothing technology has ideal performance for the direction of arrival estimation of coherent signal sources, and its calculation amount is small, which is easy to realize, but the sacrifice of effective array elements leads to the reduction of array aperture, which affects the estimation accuracy of direction of arrival

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  • Method for estimating two-dimensional direction-of-arrival of coherent signal source by means of L-shaped array based on time smoothing
  • Method for estimating two-dimensional direction-of-arrival of coherent signal source by means of L-shaped array based on time smoothing
  • Method for estimating two-dimensional direction-of-arrival of coherent signal source by means of L-shaped array based on time smoothing

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Embodiment Construction

[0037] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] refer to figure 1 , the implementation steps of the present invention are as follows:

[0039] Step 1: Place the L-array radar in the coordinate system, and the L-array radar transmits multi-period chirp signals to the scene Z ahead.

[0040] (1a) Place all radar elements on the ground, take the south direction as the positive direction of the x-axis, take the due east direction as the positive direction of the y-axis direction, take the intersection of the x-axis and the y-axis as the origin, and move from half wavelength Arrange n array elements at a distance of , and λ represents the carrier wavelength; arrange n-1 array elements at a distance of d in the positive direction of the y-axis, forming an L-shaped array radar composed of 2n-1 array elements ;

[0041] (1b) The L-shaped array radar transmits a multi-peri...

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Abstract

The invention discloses a method for estimating a two-dimensional direction-of-arrival of a coherent signal source by means of an L-shaped array based on time smoothing. The method is implemented by the steps of: 1, transmitting a multi-period linear frequency modulation signal to a scene in the front by means of an L-shaped array radar, and receiving an echo signal reflected by the scene; 2, performing two-dimensional discrete sampling on the echo signal to obtain a matrix form of the echo signal, and carrying out fourth-order cumulant and time smoothing processing to obtain a covariance matrix; 3, constructing a noise subspace according to the covariance matrix, and constructing a signal subspace according to a matrix placement form; 4, and estimating a direction-of-arrival of a signal source according to orthogonality between the signal subspace and the noise subspace. The method can realize precise estimation of the two-dimensional direction-of-arrival of the coherent signal source, improves the direction-of-arrival estimation performance under a low signal-to-noise ratio, and can be used for measuring space angles of a stationary or moving target.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a method for effectively estimating the two-dimensional direction of arrival of a coherent signal source, which can be used for space angle measurement of stationary or moving targets. Background technique [0002] With the continuous development of modern science and technology, spectral estimation integrates the theories and technologies of classical transformation technology, statistical estimation theory, system identification, information theory, time series analysis and computing technology, and develops rapidly. , New methods are constantly emerging, and modern spectral estimation has been widely used in many aspects. A basic problem in array signal processing is to determine the orientation or position of space signals of interest, which is also one of the important tasks in many fields such as radar, sonar, and seismic exploration. Its main applications are as follows: ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 熊凯赵光辉石光明
Owner XIDIAN UNIV
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