Calibrating method for focused imaging of multi-frequency continuous wave system
A focused imaging, single-frequency technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as users may not know, calibration failure, etc., to achieve the effect of rich information, more data, and high calibration accuracy
Active Publication Date: 2015-04-29
NAT UNIV OF DEFENSE TECH
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Often even if there is a change in the system, the original calibration is invalid, and the user may not know it
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[0042] In order to better understand the technical solutions of the present invention, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0043] figure 1 Shown is a schematic flow chart of the multi-frequency continuous wave system focus imaging calibration method proposed by the present invention, including single-frequency focus imaging, large signal-to-noise ratio data extraction, average phase deviation and average amplitude calculation, and multi-frequency data phase and amplitude calibration. steps. The implementation of the four calibration steps is described in detail below:
[0044] The first step, single-frequency focusing imaging
[0045] Use the multi-frequency continuous wave system to complete the two-dimensional plane scanning of the target and obtain the three-dimensional data R' fxy , from which each frequency data R(f i )(f i =f 1 , f 2 ,..., f I ), pe...
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The invention provides a calibrating method for focused imaging of a multi-frequency continuous wave system. The calibrating method for focused imaging of the multi-frequency continuous wave system comprises the steps that data at all frequencies are extracted from two-dimensional scanning data of the multi-frequency continuous wave system, and single-frequency focused imaging is conducted firstly, so that an optimum focused image is obtained; pixel data with a high signal to noise ratio are extracted based on the image, and the average phase deviation and the average amplitude are calculated; a calibration compensating factor is formed by means of a calculation result, and phase calibration and amplitude calibration are conducted on multi-frequency data; multi-frequency imaging processing is conducted on calibrated data, in this way, a good focused imaging effect can be achieved, a target contour is clearer, the number of background clutters is smaller, and the signal to noise ratio is increased. Due to the fact that a mass of data are used, information is rich, and calibration precision is high. The calibrating method is based on data driving, calibration hardware accessories are not needed, and complicated calibrating measurement does not need to be conducted.
Description
technical field [0001] The invention relates to a calibration method for a multi-frequency continuous wave system, in particular to a calibration method for a multi-frequency continuous wave imaging system. Background technique [0002] The phase and amplitude of the coherent receiving output of the multi-frequency continuous wave system include the influence of the circuit before mixing, the transmission cable, the antenna, the propagation medium, the target scattering and so on. Amplitude and phase inconsistencies. For the imaging system, the deviation of the phase will make the imaging effect drop sharply, and in severe cases, the imaging cannot be focused at all. Although the impact of amplitude deviation is not serious, it still exists to a certain extent, mainly reflected in the tailing and oscillation in the distance direction. [0003] Calibration is usually required to remove these effects. There are two main types of existing calibration methods: one is to use t...
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IPC IPC(8): G01S7/40
CPCG01S7/4021
Inventor黄春琳陆珉粟毅李禹唐涛
OwnerNAT UNIV OF DEFENSE TECH