Multiband ultra-wideband imaging processing method for near-field measurement of MIMO radar

A technology of ultra-wideband imaging and processing method, which can be used in measurement devices, radio wave measurement systems, reflection/re-radiation of radio waves, etc., can solve the problems of MIMO radar imaging range resolution limitation, etc., and achieve the effect of improving the range resolution ratio.

Active Publication Date: 2018-11-27
BEIHANG UNIV
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Problems solved by technology

In this way, it can be solved under the conditions of MIMO radar near-field imaging measurement, because image reconstruction needs to complete processing such as equalization of transmitting and receiving channels, correction of array element pattern, attenuation compensation ...

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  • Multiband ultra-wideband imaging processing method for near-field measurement of MIMO radar
  • Multiband ultra-wideband imaging processing method for near-field measurement of MIMO radar
  • Multiband ultra-wideband imaging processing method for near-field measurement of MIMO radar

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Embodiment

[0097] The data used in this embodiment is the aircraft model target imaging data obtained from the actual MIMO radar near-field measurement. The MIMO radar frequency of the imaging measurement data covers three bands, called band-1, band-2 and band-3. Among them, band-1 has the lowest frequency, and band-3 has the highest frequency, and the lowest and highest frequencies of the three bands are adjacent to each other, that is, there is no data notch between the bands. Therefore, the steps of MIMO radar multi-band data fusion imaging processing are as follows:

[0098] Step 1: Use the MIMO-FBP imaging algorithm to reconstruct the image of the data of the three bands one by one

[0099] The MIMO-FBP algorithm suitable for MIMO radar near-field imaging processing is used to reconstruct the MIMO radar imaging data of each band, and the low-resolution complex images of band-1, band-2 and band-3 are obtained. During this process, the equalization of each transceiver channel of the ...

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Abstract

The invention discloses a multiband ultra-wideband imaging processing method for near-field measurement of an MIMO radar. The method comprises the main steps that a filtering-inverse projection (MIMO-FBP) algorithm suitable for near-field measurement of the MIMO (multiple-input-multiple-output) radar is used to carry out image reconstruction on multiband imaging data of the MIMO radar, and channelequalization, directional diagram correction, propagation attenuation compensation and spherical wavefront correction are completed automatically in each band to obtain low-resolution complex imagesin the different bands; 2D fast Fourier transform (2D-FFT) is carried out to transform the complex images in the different bands to corresponding data domains, re-sampling is carried out along a sector ring, and sector ring domain data corresponding to the images in the different bands is obtained; and the multiband sector ring domain imaging data is fused in a proper manner to obtain full waveband MIMO ultra-wideband imaging data; and a traditional FBP imaging algorithm is used to carry out image reconstruction on the fused full waveband data. Thus, a full waveband high-resolution image is obtained.

Description

technical field [0001] The invention relates to the technical field of radar imaging processing, in particular to a multi-band ultra-wideband imaging processing method for MIMO (Multiple Input Multiple Output) radar near-field measurement. Background technique [0002] MIMO radar high-resolution near-field diagnostic imaging measurement radar is a new system of imaging radar, which has good system portability, fast imaging measurement and processing speed, and high-resolution snapshot imaging of stationary targets without the need for target rotation Etc. However, the engineering application of MIMO imaging radar faces the following two problems: [0003] (1) The azimuth (lateral distance) imaging resolution of the MIMO imaging radar is proportional to the virtual aperture size of the MIMO antenna in the lateral direction, and inversely proportional to the distance between the antenna array and the measured target. Lateral distance resolution δ cr The calculation formula ...

Claims

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Application Information

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IPC IPC(8): G01S13/89G01S7/42
CPCG01S7/42G01S13/89
Inventor 许小剑
Owner BEIHANG UNIV
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