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Arrival time difference estimation method

A time difference estimation and time difference technology, applied in the field of time difference of arrival estimation

Inactive Publication Date: 2016-03-16
SHANGHAI DIANJI UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to aim at the above-mentioned defects in the prior art, by generalizing the ETDGE algorithm that can unbiasedly estimate the non-integer time difference of arrival in the Gaussian environment, and propose a new method that works great

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Embodiment Construction

[0039] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0040]

[0041] In the time difference of arrival estimation problem, it is usually assumed that two received signals x 1 (n) and x 2 (n) obey the following model:

[0042] x 1 (n)=s(n)+v 1 (n)(2)

[0043] x 2 (n)=s(n-D)+v 2 (n)(3)

[0044] Here s(n) is the source signal, D is a non-integer time delay, v 1 (n) and v 2 (n) are the received background noise respectively, and assume v 1 (n) and v 2 (n) obeys α-stable distribution. The source signal and noise are independent, and the two noises are also independent of each other. A FIR filter whose coefficient is sampled by the sinc function is used to fit the time delay, so that the real value of the time difference of arrival can be directly estimated when the true value of the time ...

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Abstract

The invention provides an arrival time difference estimation method. The method comprises a step of setting of a reference ETDGE algorithm initial value in which an NLMP algorithm is firstly used for arrival time difference rough estimation, an integer place of the arrival time difference truth value is firstly estimated, the numerical value of the integer place serves as the initial value processed by an LMPFTDE algorithm, further fine estimation is then carried out, and the decimal place of the arrival time difference truth value is then estimated.

Description

technical field [0001] The present invention relates to the field of random signal processing, and more specifically, the present invention relates to a method for estimating time difference of arrival with high precision. Background technique [0002] Time difference of arrival estimation is widely used in fields such as radiolocation, radar, sonar, seismic survey and biomedicine. The traditional TDOA estimation theory and technology are based on Gaussian distribution and second-order statistics. Although this assumption is reasonable in many cases, it conforms to the central limit theorem, which can make the TDOA estimation algorithm simpler and more convenient. Analytical theoretical analysis is carried out, but there are a large number of non-Gaussian signals and noises in practical applications. For example, radar echoes, underwater acoustic signals, low-frequency atmospheric noise, some biomedical signals, and many artificially generated signals are all non-Gaussian d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/50G01S5/04G01S5/10G04C11/00
CPCG01S3/50G01S5/04G01S5/10G04C11/007
Inventor 刘文红
Owner SHANGHAI DIANJI UNIV
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