A Method for Estimating Incoherent Direction of Arrival under Phase Error

A technology of direction of arrival estimation and phase error, which is applied to radio wave direction/bias determination systems, direction finders using radio waves, etc. The effect of reducing hardware overhead and reducing computational complexity

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A technology of direction of arrival estimation and phase error, which is applied to radio wave direction/bias determination systems, direction finders using radio waves, etc. The effect of reducing hardware overhead and reducing computational complexity

CN108957386BActive Publication Date: 2022-07-01YANSHAN UNIV

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[0058] The content and effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0059] refer to figure 1 and figure 2 , the implementation steps of the present invention are as follows:

[0060] Step 1: Under a high-power reference signal source with known direction of arrival and power, a non-uniform nested sensor array is used to receive the target signal, and the form of the estimated direction of arrival signal under the phase error is determined;

[0061] Suppose a high-power reference signal source with known direction of arrival and power and K uncorrelated signal sources are incident on a nested array composed of two uniform linear sub-arrays, such as figure 1 shown. The total number of array elements is L=M+N-1, the sub-array 1 is composed of N sensors, the sensor spacing is d, the sub-array 2 is composed of M-1 sensors, the sensor spacing is Nd, and the two sub-arrays are located on the same horizontal line...

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Abstract

The invention discloses a method for estimating an incoherent direction of arrival under phase error. Determine the form of the DOA estimation signal under the phase error; calculate the covariance matrix of the array observation data, and obtain an asymptotically noise-free and phase-error-free vector model through eigenvalue decomposition, modulo, vectorization and square processing in turn; The asymptotic vector model is approximated and equivalently summed by the linear model based on the characteristics of the high-power reference source, and is based on l under the cosine overcomplete base dictionary. 2 ‑l 1 The norm-minimizing sparse reconstruction method obtains DOA estimates. The present invention is insensitive to phase error, has high estimation accuracy and low computational complexity, and can complete effective estimation of the direction of arrival of multiple target sources without two-dimensional spectral peak search and multiple reference signal sources.

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technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to an incoherent direction of arrival estimation method under phase error. Background technique [0002] Direction of arrival estimation is an important direction of sensor array signal processing, and it has a wide range of applications in many fields such as radar, sonar, wireless communication and medical electronics. In a sensor array receiving system, ideal phase synchronization conditions are expected. However, in practice, due to the influence of local oscillator clock offset and sensor position error, it is often difficult to achieve precise phase synchronization conditions. Under such background conditions, the DOA estimation methods based on the classical subspace theory (such as MUSIC, ESPRIT, etc.) will obviously decline or even fail. Therefore, it is of great significance to study the DOA estimation method that is insensitive to phase error to improv...

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Application Information

Patent Timeline

01 Jul 2022

Publication

CN108957386B

IPC: G01S3/14

CPC: G01S3/14

Inventors: 田野; 徐鹤