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Virtual aperture MIMO radar target detection method based on two-dimensional block sparse recovery

A radar target and virtual aperture technology, applied in the radar field, can solve problems such as inapplicability to multi-target scenarios

Pending Publication Date: 2021-09-14
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, this method assumes that all targets have the same distance, which is not suitable for multi-target scenarios with scattered distances that may exist in practical applications.

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  • Virtual aperture MIMO radar target detection method based on two-dimensional block sparse recovery
  • Virtual aperture MIMO radar target detection method based on two-dimensional block sparse recovery
  • Virtual aperture MIMO radar target detection method based on two-dimensional block sparse recovery

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Embodiment Construction

[0021] to combine figure 1 , the present invention proposes a virtual aperture MIMO radar target detection method based on two-dimensional block sparse recovery, which mainly includes dictionary construction-model construction-model solution-beam forming-constant false alarm processing and other processes. The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] Step 1: Construct the distance-dimension redundancy dictionary and Doppler-dimension dictionary.

[0023] Assuming that the MIMO radar has M transmit channels and N receive channels, a typical arrangement (uniform linear array) is as follows figure 2 shown. First divide the possible distance range of the target into L r discrete grid points, the fast time delays corresponding to each grid point are (l r -1)Δ r , where Δ r is the minimum delay interval between grid points, l r =1,...,L r ; Since M channels transmit waveforms differently, for each tr...

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Abstract

The invention discloses a virtual aperture MIMO radar target detection method based on two-dimensional block sparse recovery, and solves the problems of high distance sidelobe, poor small target detection performance and the like of a traditional virtual aperture MIMO radar. According to the method, a two-dimensional block sparse recovery method is adopted, and distance side lobes caused by incomplete orthogonality of waveforms are effectively inhibited by utilizing similarity and sparsity prior information of a distance-Doppler graph between virtual apertures in a target scattering information inversion problem; and the weak and small target detection performance loss caused by strong clutters and strong target side lobes is reduced, and the detection performance of the virtual aperture MIMO radar is improved.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a virtual aperture MIMO radar target detection method in the radar target detection technology. Background technique [0002] The MIMO radar using the orthogonal waveform system between transmitting stations can synthesize virtual apertures at the receiving end, has the advantages of high array freedom, good beam pattern performance and high angular resolution, and plays an important role in the field of radar target detection. [0003] In MIMO radar, to completely separate the echoes of multiple transmitting channels at the receiving end, it is required that the waveforms of each transmitting channel be completely orthogonal under the conditions of different time delays and different Doppler frequency modulations. In practice, such quadrature waveforms do not exist. Due to the incomplete orthogonality of waveforms in virtual aperture MIMO radars in practical applicati...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 陆星宇徐邦祯谭珂杨建超虞文超戴峥苏卫民顾红
Owner NANJING UNIV OF SCI & TECH
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