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A Fast Estimation Method of Source Radial Velocity Based on Fixed Antenna Array

A technology of radial velocity and fixed antenna, which is applied in the direction of radio wave reflection/reradiation, radio wave measurement system, instrument, etc., can solve the problem that it is difficult to quickly estimate the radial velocity information of the source, and achieve long operation time and calculation A large amount of effect

Active Publication Date: 2019-04-09
WUHAN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for quickly estimating the source radial velocity based on the music algorithm in the case of a fixed antenna array, which solves the difficulty of quickly estimating the source radial velocity information with subspace algorithms in a fixed array

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  • A Fast Estimation Method of Source Radial Velocity Based on Fixed Antenna Array
  • A Fast Estimation Method of Source Radial Velocity Based on Fixed Antenna Array
  • A Fast Estimation Method of Source Radial Velocity Based on Fixed Antenna Array

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Embodiment Construction

[0025] On the basis of the maturity of the classical music algorithm, the core of the fast estimation algorithm involved in the present invention is the construction of the virtual switching array model in the fixed linear array and the radial velocity estimation. The following is a detailed introduction to it:

[0026] For an M-element uniform linear array, the array element spacing is d (array model such as figure 1 ). When the signal source is a narrowband signal, assuming that the signal frequency is f and the corresponding wavelength is λ, the transmitted signal is

[0027] x 0 (t)=exp(j2πft) (1)

[0028] In an ideal situation, regardless of the variation of the echo signal amplitude, the far-field echo signal y received by the mth array element m (t) is:

[0029] the y m (t)=x 0 (t-t m )

[0030]

[0031] t m Indicates the time delay of the echo signal of the mth array element relative to the transmitted signal, D is the distance information of the source at...

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Abstract

The invention provides a signal source radial speed rapid estimate method based on a fixed antenna array; the algorithm uses a conventional music (multiple signal classification) algorithm as basis, estimates a signal source azimuth according to one-dimensional peak searching, thus obtaining signal source orientation information; the method builds a virtual switching array and estimates angle again, thus expressing the signal source radial speed information in angle estimation error, and obtaining the speed value according to front and back estimated angle values. Compared with a method using two dimension music peak searching to solve the orientation and radial speed, the signal source radial speed rapid estimate method based on the music orientation and speed estimate algorithm can greatly improve the estimation speed.

Description

technical field [0001] The invention relates to a method for estimating the radial velocity of a signal source in array signal processing, in particular to a method for rapidly estimating the radial velocity of a signal source based on a fixed antenna array. Background technique [0002] In array signal analysis and processing, the classic super-resolution DOA (Direction of Arrival) estimation algorithm and its derivatives based on subspace decomposition have received great attention and favor for their superior direction-finding performance and good angular resolution. However, the superiority of the classic music algorithm can only be reflected in the source azimuth estimation. For the basic fixed array, the music algorithm is not sensitive to the source motion, and it is difficult to extract the velocity information of the moving target. In the switching array, the 2D-music algorithm is applied to improve the classic music algorithm, and the radial velocity component is w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/58G01S7/41
CPCG01S7/418G01S13/589
Inventor 梅慧周恒陈章友吴雄斌
Owner WUHAN UNIV