Inertia ratio extraction method for free space flight targets
A technology of flying target and extraction method, which is applied in the field of inertia ratio extraction, can solve the problem of high quality requirements of target one-dimensional resolution imaging, and achieve the effect of simple design and clear principle
Inactive Publication Date: 2018-04-06
BEIJING INST OF ELECTRONICS SYST ENG
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[0004] The purpose of the present invention is to provide a method for extracting the inertia ratio of a free-flying target in space. The present invention solves the problem that the existing method requires too high a one-dimensional resolution imaging quality of the target when extracting the inertia ratio
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[0050] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.
[0051] A method for extracting the inertia ratio of a free-flying target in space, the specific implementation steps are as follows figure 1 shown, including:
[0052] The first step is to extract the baseband echo signal from the original radar echo signal through frequency mixing and filtering;
[0053] The second step is to perform time-frequency transformation on the target baseband echo signal:
[0054] In this embodiment, the target baseband echo signal is mapped to the time-frequency two-dimensional plane by using...
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The invention discloses an inertia ratio extraction method for free space flight targets. The method comprises steps that a baseband echo signal is extracted from a radar original echo signal by frequency mixing and filtering processing; time-frequency exchange of the target baseband echo signal is performed to acquire a micro-Doppler time-frequency distribution map; morphological image processingof the micro-Doppler time-frequency distribution map is performed to acquire a binary matrix; a micro-Doppler mixed sequence is acquired based on the binary matrix; the frequency information and theamplitude information of the first three maximum extremum points of the frequency spectrum of the micro-Doppler mixed sequence are extracted; the target inertia ratio is extracted through the maximumextremum point information. The method is advantaged in that a problem of overhigh one-dimensional resolution imaging quality target requirement existing in a method in the prior art is solved.
Description
technical field [0001] The invention relates to a method for extracting an inertia ratio, in particular to a method for extracting an inertia ratio of a free-flying object in space. Background technique [0002] For a rigid body target, the inertia ratio is a physical quantity related only to the properties of the target itself, which can characterize the distribution characteristics of the target mass in the two orthogonal directions of OZ and OX (or OY), and describe the inertia of the target when it rotates around the axis. For a free-flying target in space, when the initial momentary force condition is given, the target’s fretting state is uniquely determined by the inertia ratio, and when the target inertia ratio is different, no matter how the initial force condition changes, its fretting state must also be different . Therefore, the inertia ratio of a free-flying target in space can be obtained from the three micro-motion parameters: spin frequency, precession freque...
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CPCG01S7/41
Inventor 王佳宁刘纯胜邓隆范盛跃宾何威张秀苹
Owner BEIJING INST OF ELECTRONICS SYST ENG