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V-FM signal system ISAR two-dimensional imaging method

A two-dimensional imaging and V-FM technology, which can be used in instruments, measuring devices, and re-radiation, etc., can solve problems such as research that has not been reported so far, and achieve the effect of improving distance resolution, facilitating implementation, and reducing sampling rate.

Active Publication Date: 2017-02-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

There have been some reports on V-FM signal characteristic analysis, matched filter processing, etc., but applying large time and wide bandwidth V-FM signals to ISAR imaging can obtain high-resolution one-dimensional range images of targets and perform two-dimensional imaging. Other studies have not been reported yet

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  • V-FM signal system ISAR two-dimensional imaging method
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  • V-FM signal system ISAR two-dimensional imaging method

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specific Embodiment approach

[0031] like figure 1 , figure 2 , image 3 As shown, a V-FM signal system ISAR two-dimensional imaging method includes the following steps: the first step is to perform dual-channel delineation and frequency modulation processing on the V-FM signal echo:

[0032] ISAR transmits V-FM signal s(t) and receives target echo signal s r (t), the subscript r indicates the received target echo signal, and the reference signal in the first channel is set as s ref-1 (t), the reference signal in the second channel is s ref-2 (t), the subscript ref represents the reference signal, and the numbers 1 and 2 represent the first and second signal receiving and processing channels respectively; the s r (t) respectively sent to the first channel and the second channel for difference frequency processing with the reference signal, and the two output signals are obtained as s if-1 (t) and s if-2 (t), the subscript if represents the target echo signal after difference frequency processing;

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Abstract

The invention discloses a V-FM signal system ISAR two-dimensional imaging method. The method comprises the following steps of first step, carrying out dual-channel solution line frequency tuning processing on a V-FM signal echo; second step, carrying out Fourier transform on solution line frequency tuning signals corresponding to dual channels, then carrying out frequency domain overturn processing on one channel of signals, and superposing the signals and the other channel of signals so as to synthesize a target high-resolution one-dimensional distance image; and third step, carrying out azimuth compression on the target high-resolution one-dimensional distance image and acquiring a target ISAR two-dimensional image. The method possesses characteristics that a production technology is simple and processing precision is high. By using the method, a detection distance can be enlarged, distance resolution can be increased and a problem that distance and speed combination measurement is fuzzy can be solved.

Description

technical field [0001] The invention relates to the field of microwave radar detection and imaging, in particular to an inverse synthetic aperture radar (ISAR) two-dimensional imaging technology, in particular to a V-FM signal system ISAR two-dimensional imaging method. Background technique [0002] According to the radar signal theory, when the average transmit power of the radar is constant, the detection distance can be improved by increasing the signal pulse width, and the distance resolution can be improved by using a large bandwidth signal. Imaging radars often use large time-width-bandwidth product signals to improve detection range and range resolution, and azimuth resolution is mainly through the relative motion of the target and the radar. [0003] V-FM signal is a common signal with large time and wide bandwidth. It not only has good detection distance and distance resolution characteristics, but also has excellent characteristics that can solve the ambiguity prob...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/90G01S13/9064
Inventor 潘小义王翔
Owner NAT UNIV OF DEFENSE TECH
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