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Method of detecting compound motion target based on orbital angular momentum

A technology of orbital angular momentum and target detection, applied in radio wave measurement systems, instruments, etc., can solve problems such as difficult separation and no detection method, achieve the effect of simple implementation process and solve the difficult problems of Doppler detection and separation

Active Publication Date: 2018-09-28
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, rotational Doppler detection based on orbital angular momentum is still in its infancy (Kang Liu, Xiang Li, Yue Gao, Hongqiang Wang, Yongqiang Cheng. Microwave imaging of spinning object using orbital angular momentum[J]. Journal of Applied Physics, 2017,122:124903.), many fundamental issues such as detection principles, models and methods need to be resolved urgently
In particular, when the target is in a compound motion state that combines translation and rotation, since translation Doppler and rotation Doppler are superimposed on each other, it is difficult to separate them, and there is currently no effective detection method

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  • Method of detecting compound motion target based on orbital angular momentum
  • Method of detecting compound motion target based on orbital angular momentum
  • Method of detecting compound motion target based on orbital angular momentum

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The first step is to design the radar emission signal. According to the Doppler theory, the translation or rotation of the radar target usually causes the frequency shift of the echo signal. In the embodiment, the radar transmit signal E i (t,l) can be designed as: the signal waveform is a single-frequency sinusoidal signal, which is modulated by multiple orbital angular momentum modes in the topological charge domain and then superimposed and synthesized, as shown in formula (1).

[0022]

[0023] where f 0 Indicates the initial transmission signal frequency, t is time, l is the number of orbital angular momentum modes, l is an integer, and the value range is [-L,L]. A l Indicates the amplitude modulation corresponding to the signal when the number of orbital momentum modes is 1, φ is the spatial azimuth angle, that is, the azi...

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Abstract

The invention belongs to the field of radar detection and Doppler detection of moving targets and particularly relates to a method of detecting a compound motion target based on orbital angular momentum. The method comprises the steps: designing a radar emission signal, and establishing an emission signal model; setting target motion parameters, acquiring a target echo equation by deduction, and analyzing with the target echo equation to obtain internal relations of Doppler frequency offset to target translational velocity and rotational angular velocity; providing a detection and separation method of translational Doppler frequency offset and rotational Doppler frequency offset; finally, implementing detection of the compound motion target based on the detection results of Doppler frequency offset. orbital angular momentum information carried by vortex electromagnetic wave can be utilized herein to provide effective detection and separation for translational Doppler and rotational Doppler, so that the detection of the compound motion target is implemented; references are provided for the development of radar detection techniques and target recognition techniques based on orbital angular momentum.

Description

technical field [0001] The invention belongs to the field of moving target radar detection and Doppler detection, in particular to a compound moving target detection method based on the combination of translation and rotation of orbital angular momentum. Background technique [0002] In the traditional radar target detection technology, the detection of moving targets is mainly based on translational Doppler. However, with the radar line of sight perpendicular to the plane of target rotation, there is no radial motion between the radar and the target, resulting in no detection of Doppler information. Analogous to translational Doppler, the effect caused by target rotation is called rotational Doppler. Because the vortex electromagnetic wave carries orbital angular momentum, its phase wavefront presents a spiral structure, and the spatial distribution structure of the wavefront is related to the number of orbital angular momentum modes, thus providing a new degree of freedom...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 刘康程永强王阳王宏强蒋彦雯王展
Owner NAT UNIV OF DEFENSE TECH
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