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Fast estimation method for non-uniform rotating target motion parameter

A motion parameter, non-uniform technology, applied in the direction of reflection/re-radiation of radio waves, instruments, measuring devices, etc., can solve the problems of parameter estimation accuracy and image quality degradation, reduce computational burden, eliminate cross-term interference, eliminate Effects of Propagation Errors

Pending Publication Date: 2019-08-20
XIDIAN UNIV
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Problems solved by technology

However, when the target rotates non-uniformly, due to the existence of high-order terms, the parameter estimation accuracy and imaging quality of traditional TFD-based methods will decrease significantly

Method used

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  • Fast estimation method for non-uniform rotating target motion parameter
  • Fast estimation method for non-uniform rotating target motion parameter
  • Fast estimation method for non-uniform rotating target motion parameter

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Embodiment Construction

[0023] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] refer to figure 1 , taking the rotation center of the target as the coordinate origin O to construct a Cartesian coordinate system O-XYZ. Unit vector that sets the radar line of sight direction The three-dimensional angular velocity vector of the target Select the projection plane for the observed imaging of the target. Among them, the three-dimensional angular velocity vector of the target Can be decomposed into: components parallel to the radar line of sight direction and the component perpendicular to the radar line-of-sight direction and have Due to the horizontal component Does not produce any rotational motion, so it does not contribute to the Doppler of the signal echo, here we only need to analyze and discuss the vertical component effect.

[0025] refer to figure 2 , the implementation steps of...

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Abstract

The invention discloses a fast estimation method for a non-uniform rotating target motion parameter. The method comprises specific steps: an echo signal in a single distance unit is modeled into a QFMsignal; a correlation function is constructed, the QFM signal is converted to a time-chirp distribution plane, and minimum entropy criterion-based weighted least squares Radon transform is adopted toestimate secondary chirp; the estimation accuracy and the robustness of the algorithm in a low signal-to-noise ratio environment are improved effectively at the same time; TFD-based weighted least squares Radon transform is adopted to estimate linear chirp, and through filtering, cross-term interference is eliminated; and according to the geometric information in a distance-Doppler domain, the center frequency is directly estimated. The calculation amount of the target motion parameter estimation process can be significantly reduced, the influences of transmission errors on estimation of eachmotion parameter are effectively avoided, and the final target parameter estimation precision and the ISAR imaging quality are ensured.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a method for quickly estimating motion parameters of a non-uniform rotating target, which is used for eliminating the influence of propagation errors and simultaneously reducing computational complexity. Background technique [0002] Inverse Synthetic Aperture Radar (ISAR) can obtain high-resolution radar images of non-cooperative moving targets in airspace through ground-based radars, and realize the observation, imaging, identification and monitoring of targets. In many applications, the target always has high maneuverability and uneven rotation. For a typical non-uniform rotating target, because each scattering point on the target contour is time-varying, the ISAR image quality will be significantly degraded. [0003] In order to solve this problem, the existing range-instantaneous Doppler (RID) algorithm, as a parameterization method, RID usually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9029G01S7/415G01S13/9064
Inventor 朱圣棋张俊王博曾操许京伟刘婧李军
Owner XIDIAN UNIV
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