Target radial and angular acceleration detection method based on composite vortex electromagnetic waves
A technology of radial acceleration and compound vortex, which is applied in radio wave measurement system, radio wave reflection/re-radiation, measurement device, etc., can solve problems such as difficult and effective detection, misjudgment of target acceleration, etc., to achieve simple detection method, High detection efficiency and improved speed measurement performance
Inactive Publication Date: 2021-08-20
HEFEI UNIV OF TECH
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However, in practical applications, in addition to angular motion, the target will also move radially at the same time. In addition, the target often does not move at a simple uniform speed, and the current radar target detection method is difficult to simultaneously move radially and angularly. Effective detection of moving uniform or variable acceleration targets, resulting in misjudgment of the target acceleration in actual detection and resulting in detection blind spots
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[0031] In this example, refer to figure 1 , a target radial and angular acceleration detection method based on composite vortex electromagnetic waves, is to use an antenna that can generate composite vortex electromagnetic waves in the radio frequency band to simultaneously send two composite OAM electromagnetic waves with different powers and different modes, incident to the simultaneous On a uniform or variable acceleration target with radial and angular acceleration. By preprocessing the echo signal and using the time-frequency analysis method, the slope or quadratic term coefficient is obtained by fitting, and the radial and angular acceleration are decoupled using the corresponding formula, so as to effectively detect the radial and angular acceleration of the target. The same applies to the variable acceleration target. In addition, acceleration in different ranges can be effectively detected by adjusting some parameters, and the direction of acceleration can be easily ...
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The invention discloses a radial and angular acceleration detection method for a uniform acceleration or variable acceleration target based on composite vortex electromagnetic waves. The method comprises the steps that 1, a transmitting end modulates the power of an input signal through a power amplifier device and then feeds the power into a vortex electromagnetic wave antenna to generate composite vortex electromagnetic waves with different topological charges; 2, the composite vortex electromagnetic waves enter a uniform acceleration or variable acceleration target with radial and angular accelerations at the same time, preprocessing and time-frequency analysis are carried out after a reflection signal is received, the slope or quadratic term coefficient of a time-frequency signal is fitted out by utilizing a fitting method, and topological charges corresponding to different slopes are judged according to different detected signal energy; and 3, the angular and radial accelerations of the uniform acceleration target are obtained, or the angular and radial acceleration coefficients of the variable acceleration target are obtained, according to a corresponding formula. According to the method, the effective detection range can be adjusted by changing the mode combination and the mode interval, and the method has certain reference significance for improving the speed measurement performance of a radar system.
Description
technical field [0001] The invention relates to a radial and angular acceleration detection method of a uniform acceleration or variable acceleration target based on a compound vortex electromagnetic wave, belonging to the field of radio wave target speed detection. Background technique [0002] In radar systems, the Doppler effect is widely used in target speed detection. However, when the angular velocity of the rotating target is perpendicular to the direction of electromagnetic wave propagation, the traditional plane wave cannot produce Doppler frequency shift. In 1992, Allen et al. discovered and proposed the concept of orbital angular momentum. In 1997, Courtial et al. observed for the first time the rotational Doppler effect produced by the vortex electromagnetic wave carrying orbital angular momentum (OAM) irradiating the rotating target, which is The detection of the rotation speed of the target brings a new way. Since then, people have done a lot of research on t...
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IPC IPC(8): G01S13/58
CPCG01S13/58
Inventor 郭忠义郭凯汪彦哲
Owner HEFEI UNIV OF TECH