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Super-resolution one-dimensional imaging method for low-altitude obstacles with stepped frequency radar

A technology of stepping frequency radar and imaging method, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., and can solve problems such as noise sensitivity and redundancy

Active Publication Date: 2016-06-29
XIDIAN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose a super-resolution one-dimensional imaging method for low-altitude obstacles with stepped frequency radar, which solves the problem of conventional compressed sensing being sensitive to noise and the number of known scattering points in the prior art. And after IFFT, there is a redundancy problem, which enhances the robustness to noise, and at the same time obtains super-resolution capabilities

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  • Super-resolution one-dimensional imaging method for low-altitude obstacles with stepped frequency radar
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  • Super-resolution one-dimensional imaging method for low-altitude obstacles with stepped frequency radar

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[0084] refer to figure 1 , illustrating a step-frequency radar low-altitude obstacle super-resolution one-dimensional imaging method of the present invention, and its specific implementation steps are as follows:

[0085] Step 1. Obtain the received data vector x of the distance scene through the stepped frequency radar m (t).

[0086] 1a) Stepped frequency radar receives echo data;

[0087] 1b) After the echo data is sampled by analog-to-digital conversion (AnalogtoDigitConvertion, ADC), the received data vector x at time t of the mth frame is obtained m (t) is:

[0088] x m (t)=[s r (m,1,t)...s r (m,n,t)...s r (m,N,t)] T ,m=1,2,...M

[0089] Among them, M is the total number of frames obtained by sampling, N is the number of step frequency points, and T represents the transpose operation.

[0090] the s r (m,n,t) represents the received data at the moment t of the nth pulse of the mth frame, the expression is:

[0091]

[0092] w(m,n,t) is the noise at the mom...

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Abstract

The invention discloses a super-resolution one-dimensional imaging method for low-altitude obstacles with step-frequency radar, and relates to a super-resolution imaging method for step-frequency radar. The steps are as follows: step 1, obtain the received data vector of the distance scene by stepping frequency radar; step 2, denoise the received data vector to obtain the observation vector; step 3, divide the distance scene into grids to obtain the grid distance; step 4, obtain the grid distance according to the observation Construct a dictionary matrix from the vector and grid distances; step 5, use the change of the sparse restoration error ratio, use the zero space adjustment method, obtain the distance restoration vector according to the dictionary matrix and the observation vector, and obtain a one-dimensional image according to the distance restoration vector at each moment. The invention mainly solves the problem that the conventional compressed sensing is sensitive to noise, the number of known scattering points and the redundancy after IFFT in the traditional method can be used for stepping frequency radar low-altitude obstacle detection and positioning, and is the prerequisite for realizing the autonomous avoidance of low-altitude aircraft .

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and relates to a step-frequency radar super-resolution imaging method, in particular to a step-frequency radar super-resolution one-dimensional imaging method for low-altitude obstacles. Background technique [0002] Compared with other sensors, such as laser and optical radar, microwave radar has the advantages of all-weather and all-weather, and is one of the important means of low-altitude environment perception. In the case of limited antenna aperture for low-altitude aircraft, millimeter-wave radar can obtain narrow beams to improve spatial resolution due to its short wavelength, and at the same time, the small size of the antenna unit can reduce volume and weight, so it is one of the important sensors for low-altitude obstacle detection. . The step-frequency radar repeatedly transmits a series of radar pulses with linear hopping of the carrier frequency (this series of pulses is call...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89
CPCG01S13/89G01S13/93G01S7/356
Inventor 梁思嘉曾操徐青刘铮李文骏汪海李章杰
Owner XIDIAN UNIV
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