A Calculation Method of Near Field Source Angle and Distance in Impulse Noise Environment
A technology of impact noise and calculation method, which is applied to the orientation device for measuring the direction, the use of re-radiation, and the measurement device, etc. It can solve the problems that the subspace direction finding algorithm cannot be applied, cannot be directly expanded, and the performance of the algorithm is deteriorated.
Inactive Publication Date: 2017-02-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Literature "A two-dimensional parameter estimation method for near-field sources under the background of shock noise" [J], Wang Bo, Wang Shuxun, Journal of Circuits and Systems, 2005, 10(5): 5-9. Using a uniform linear array as a receiving array to study the shock The problem of two-dimensional parameter estimation (azimuth and distance) of near-field sources under noise, but this method cannot be directly extended under the uniform circular array receiving array
And in the impact noise environment, because the SαS noise has a limited p-order moment if and only when 0<p<α<2 (α represents the characteristic index), the second-order moment of the SαS random variable does not exist, so the traditional The subspace direction-finding algorithm based on second-order moments or higher-order moments cannot be applied to the SαS noise environment, and the performance of the algorithm in this literature will deteriorate
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[0043] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0044] Such as figure 2 The uniform circular array with radius L shown is taken as an example, and the array has M=8 array elements. Consider a narrow-band signal s(t), which arrives at a uniform circular array, and the angle between it and the positive direction of the X-axis is θ, and the angle between it and the positive direction of the Z-axis is . Take the center of the uniform circular array as the phase reference point. The received signal vector of the array at time t is
[0045] x(t)=As(t)+n(t) (1)
[0046] Among them, A=[a 1 (r, θ, φ) a 2 (r, θ, φ) … a M (r, θ, φ)] T ,[] T represents the vector transpose, ω=2π / λ, λ is the wavelength of the signal, n(t) is the impulse noise independent of the signal s(t). d l (r, θ, φ) is the distance between the signal source and the lth array element,
[0047] d l (...
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The invention discloses a method for calculating the angle and distance of near-field sources in an impact noise environment. In the field of parameter estimation for near-field signal sources in an impact noise environment, it involves the use of uniform circular arrays to reduce the fraction of near-field signals in complex environments. step-moment processing techniques. After the data is received by the circular receiving antenna array, the spatial sign function of each data is calculated first, and then two types of covariation matrices are calculated, and the direction of arrival of the signal source is calculated by the phase angle of the first type of covariation matrix, and the direction of arrival of the signal source is calculated by the second The phase angle of the second-type covariation matrix calculates the distance between the signal source and the base station, so that the target positioning process in the impact noise environment has the effects of fast speed, high precision, small amount of calculation, and low cost.
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technical field [0001] The invention belongs to the field of parameter estimation for a near-field signal source in an impact noise environment, and relates to a fractional low-order moment processing technology for a near-field signal in a complex environment by using a uniform circular array. Background technique [0002] The problem of near-field source localization has important research significance in modern signal processing. Since the near-field source signal model includes not only angle parameters but also distance parameters, in the case of a uniform circular array, its position parameters are extended from one-dimensional (azimuth angle) of the traditional far-field narrowband signal source to three-dimensional (azimuth, elevation angle and distance ), increasing the complexity of the algorithm and the difficulty of estimation. [0003] In order to solve the problem of parameter estimation of near-field sources, in the Gaussian noise environment, the linear pred...
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IPC IPC(8): G01S11/04G01S3/46
CPCG01S3/46G01S11/04
Inventor 郭贤生储磊李葆仓张妍卢书洲万群
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA