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Two-Dimensional Direction of Arrival Estimation Method for Coherent Signal Sources Based on L-Type Arrays Based on Time Smoothing

A time-smoothing and direction estimation technology, applied in the field of radar, can solve the problems of small calculation amount, affecting the accuracy of direction of arrival estimation, reducing the array aperture, etc., to avoid aperture loss, ensure noise immunity and Lupin performance, good The effect of estimating ability

Active Publication Date: 2020-01-31
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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  • Two-Dimensional Direction of Arrival Estimation Method for Coherent Signal Sources Based on L-Type Arrays Based on Time Smoothing
  • Two-Dimensional Direction of Arrival Estimation Method for Coherent Signal Sources Based on L-Type Arrays Based on Time Smoothing
  • Two-Dimensional Direction of Arrival Estimation Method for Coherent Signal Sources Based on L-Type Arrays Based on Time Smoothing

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Embodiment Construction

[0036] The embodiments and effects of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] Reference figure 1 , The implementation steps of the present invention are as follows:

[0038] Step 1: Place the L-shaped array radar in the coordinate system, and the L-shaped array radar transmits a multi-period chirp signal to the front scene Z.

[0039] (1a) Place all radar array elements on the ground, take the true south direction as the positive direction of the x-axis, take the true east direction as the positive direction of the y-axis, and use the intersection of the x-axis and the y-axis as the origin. Half-wavelength Arrange n array elements at a distance of λ, λ represents the wavelength of the carrier wave; arrange n-1 array elements from the position of the distance d to the distance d in the positive direction of the y-axis, forming an L-shaped array radar composed of 2n-1 array elements ;

[0040] (1b) The L-...

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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, and specifically is a method that can effectively estimate the two-dimensional direction of arrival of a coherent signal source, and can be used for spatial angle measurement of stationary or moving targets. Background technique [0002] With the continuous development of modern science and technology, spectrum estimation has been rapidly developed by integrating classical transformation technology, statistical estimation theory, system identification, information theory, time series analysis and computing technology and other theories and technologies. Various new theories and technologies New methods are constantly emerging, and modern spectrum estimation has been widely used in many aspects. A basic problem of array signal processing is to determine the position or location of the space signal of interest, which is also one of the important tasks in many fields such as radar, sonar, and seismic expl...

Claims

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Application Information

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