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Sector-scan imaging method based on ultra wide band MIMO array

An imaging method, ultra-wideband technology, applied in the field of array imaging, can solve the problems of increasing the complexity of the algorithm, imaging of immobile targets, etc., and achieve the effect of overcoming the long time of transmitting signals and high distance resolution

Inactive Publication Date: 2013-12-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

When the target is in a moving state, the target has already undergone distance migration during the process of pulses irradiating the target one after another, which makes it impossible for the stepping frequency system to directly image the moving target, and the subsequent target motion compensation also greatly increases the algorithm. the complexity of

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  • Sector-scan imaging method based on ultra wide band MIMO array
  • Sector-scan imaging method based on ultra wide band MIMO array
  • Sector-scan imaging method based on ultra wide band MIMO array

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0021] Main content of the present invention has:

[0022] 1. Use the M transmitting elements of the MIMO array to simultaneously transmit M mutually independent pulse signals in a single pulse, such as M continuous wave (Continuous Wave, CW) pulses with unequal center frequencies or M frequency bands separated from each other. Frequency modulation (Linear Frequency Modulation, LFM) pulse. The total bandwidth of these M mutually independent pulses is equal to the bandwidth of a single UWB pulse. The echo is received by a line array, and the echo components corresponding to different pulses are separated by matched filtering. These echo components are processed separately, and UWB signal synthesis is performed on them to obtain the final sector scan image.

[0023] 2. The...

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Abstract

The invention provides a sector-scan imaging method based on an ultra wide band MIMO array. M independent pulse signals are simultaneously transmitted in a single pulse through M transmitting array elements of the MIMO array, and the total bandwidth of M independent pulses is equal to the bandwidth of a single UWB pulse. An echo is received through a linear array, and echo moments corresponding to the different pulses are separated through matched filtering. The echo moments are processed, the UWB signal synthesis is conducted on the echo moments, and a final sector-scan image is obtained. The sector-scan imaging method based on the ultra wide band MIMO array has the high-direction and high-range resolution which is similar to the resolution obtained when a single large-bandwidth UWB signal is used, and the defects that the time consumed when the signal is transmitted through a step frequency imaging system is too long is overcome.

Description

technical field [0001] The invention relates to an array imaging method. Background technique [0002] Ultra-Wideband (Ultra-Wideband: UWB) imaging systems obtain high range and high azimuth resolution by using UWB signals with large bandwidths (Taylor J, Ultra-wideband radar technology, Boca Raton: CRC Press, 2001). Applying ultra-wideband technology to the field of array sector-scan imaging can improve imaging resolution without increasing the number of array elements and array aperture. However, in actual use, the transmitting end of many sector-scan imaging systems cannot directly transmit large-bandwidth UWB signals. In addition, the bandwidth of the processor at the receiving end of the sector-scan imaging system is limited, and it is difficult to directly process UWB signals with large bandwidth. In response to these shortcomings, Gill (Gill G, Detection of targets embedded in clutter using frequency step waveform, Proceedings of the 1994 International Symposium on ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
Inventor 孙超刘雄厚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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