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Super-resolution one-dimensional distance imaging method of step frequency radar

A technology of stepped frequency radar and imaging method, which is applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve the problems of difficult selection of observation values, low imaging signal-to-noise ratio, and reduced recovery effect. , to achieve the effect of favorable target detection, low signal-to-noise ratio requirements, and robust noise

Active Publication Date: 2012-08-15
XIDIAN UNIV
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Problems solved by technology

However, it is not easy to select observations containing all the information of a certain distance range, and the recovery effect is significantly reduced in the environment of low signal-to-noise ratio, that is, it is sensitive to noise and the imaging signal-to-noise ratio is not high.

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  • Super-resolution one-dimensional distance imaging method of step frequency radar
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  • Super-resolution one-dimensional distance imaging method of step frequency radar

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Embodiment Construction

[0032] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0033] Step 1. Singular value decomposition (SVD) is performed on the echo data X mixed by the stepped frequency radar to obtain three different matrices:

[0034] [U,L,V]=svd(X),

[0035] Among them, the echo data X is an N×M dimensional complex matrix, N is the number of stepping pulses, M is the number of sampling points for each pulse repetition period, svd( ) means singular value decomposition, U is an N×N dimensional square matrix, L is an N×M dimensional diagonal matrix, and V is an M×M dimensional unitary matrix.

[0036] Step 2. Construct the data selection matrix D according to the number of targets k, and use the data selection matrix D, echo data X and unitary matrix V to obtain the observed value Y:

[0037] Y=XVD,

[0038] Wherein, data selection matrix D=[I k Z] T , I k is a k-dimensional unit matrix, Z is a k×(M-k) dimensional zero matrix, and T is a ...

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Abstract

The invention discloses a super-resolution one-dimensional distance imaging method of a step frequency radar and is used for mainly solving the problems of redundancy target, synthetic bandwidth limit on resolution, low signal to noise ratio of one-dimensional distance and instability on noise in the prior art. The realization process comprises the following steps: performing singular value decomposition on echo data with frequency mixing operation of the step frequency radar; serving a signal sub-space as an observation value according to the singular value decomposition result; performing grid division on the radar irradiation distance region to obtain distance units; structuring an observation matrix according to the distance units obtained in the grid division operation and the signal obtained in the frequency mixing operation of the step frequency radar; and recreating a one-dimensional distance image through a CVX convex optimization tool according to the observation value and the observation matrix. The method disclosed by the invention obtains super-resolution one-dimensional distance complex image with high signal to noise ratio without removing redundancy on a condition of low signal to noise ratio of radar echo, so that the method can be applied in super-resolution distance imaging processing of the step frequency radar.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a step-frequency radar imaging method, which can be used for step-frequency radar range super-resolution imaging processing. Background technique [0002] The use of radar to achieve high-resolution or super-resolution imaging of one-dimensional range of targets not only has the advantages of radar all-weather, all-time and active detection, but also can obtain detailed information of target range, thereby improving the ability of target detection, positioning and recognition. The application of one-dimensional range images in the civilian field can realize industrial metal flaw detection, high-speed train safety prevention and control, and low-altitude aircraft autonomous danger avoidance based on power line detection, so the application prospect is very broad. The radar range resolution is inversely proportional to the bandwidth of the transmitted signal, and ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
Inventor 王民航曾操刘峥陈天李东杨东廖桂生陶海红杨科
Owner XIDIAN UNIV
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