Novel DOA estimation method in pulse noise environment

A technology of impulse noise and DOA, applied in the field of DOA estimation, can solve the problem of target signal drowning

Active Publication Date: 2018-04-13
DALIAN UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the working environment of wireless communication and other systems, due to the existence of various noises and interferences, the target signal received by the receiver is often submerged in the noises and interferences. In order to better suppress the impulse noise and the influence of co-channel interference, improve the robustness of DOA estimation algorithm, the present invention proposes a DOA estimation method under impulse noise environment

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  • Novel DOA estimation method in pulse noise environment

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] The DOA estimation method under the impulse noise environment, this method comprises the following steps:

[0036] Step 1: Build a Signal Reception Model

[0037] Considering that L far-field narrowband signals are incident on a uniform linear array with M array elements, under the assumption that the signal source is narrowband, the mathematical model of the received signal can be expressed as:

[0038] X(t)=A(θ)S(t)+N(t) (1)

[0039] Among them, X(t)=[x 1 (t),...,x M (t)] T is the observed signal vector; is the incident signal vector with cycle frequency ε, K a a The signals have different cyclic frequencies or do not have cyclostationary characteristics; is the direction vector of the incident signal of interest, and θ k is the incident angle of the kth signal source; N(t)=[n 1 (t),n 2 (t),...n M (t)] T is the M×1-dime...

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Abstract

In order to suppress pulse noises and the interference of the same-frequency band signal, the invention defines a novel cyclic correlation function and proposes a novel MUSIC algorithm based on Sigmoid cyclic correlation, and applies the algorithm to DOA estimation under stable distributed noises. The simulation result demonstrates that the SCC-MUSIC-algorithm-based novel DOA estimation method enables a good estimation result to be obtained and has the outstanding advantages in a high-impulsive noise environment by being compared with the classical MUSIC algorithm, the class-related-entropy-based CRCO-MUSIC algorithm, and a fractional-lower-order-moment-based FLOM-MUSIC algorithm.

Description

technical field [0001] The invention belongs to the field of communication and information systems, and in particular relates to a new DOA estimation method in an impulse noise environment. Background technique [0002] DOA (Direction of Arrival) estimation is one of the basic problems in array signal processing, which is widely used in radar, sonar and radio communication and other fields. The multiple signal classification (Multiple Signal Classification, MUSIC) algorithm can realize the super-resolution estimation of DOA, but the traditional algorithm mostly assumes that the background noise obeys the Gaussian distribution. In fact, due to the influence of natural factors (such as atmospheric noise, sea clutter, etc.) and human factors (such as electromagnetic equipment such as motors), the noise may show strong impulsiveness, and it is more appropriate to use Alpha stable distribution to describe it. Unlike Gaussian distributed random variables, Alpha-stable distributed...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 李丽
Owner DALIAN UNIV
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