Parameter Estimation Method of Spatial Nutating Target Based on Wideband Radar Observation

Abstract

The invention discloses a space nutation target parameter estimation method based on broadband radar observation, which mainly solves the problem of nutation parameter estimation of an unknown target shape or an unknown scattering center position. The method is realized by the following steps that a broadband echo sequence of a space nutation target is obtained by a radar; after motion compensation is performed on the echo sequence, a high-resolution radial-distance sequence of a plurality of static scattering centers of the target is obtained, and spectral estimation is performed on the high-resolution radial-distance sequence, so as to obtain initial values of coning angular frequency, spin angular frequency and nutation angular frequency; a space motion model of the target is established in accordance with a geometric orientation diagram of the target and the line of sight of the radar; European three-dimensional reconstruction is performed on the high-resolution radial-distance sequence, so as to obtain a European motion reconstruction matrix; and according to the European motion reconstruction matrix, the space motion model and the initial values of the angular frequencies, an iterative optimization algorithm is adopted to estimate the coning angular frequency, the spin angular frequency, the nutation angular frequency, an amplitude of swing, an initial phase and a central angle of swing. The space nutation target parameter estimation method has the advantage of good estimation performance and can be used for space target recognition of the radar.

Description

technical field [0001] The invention belongs to the technical field of radar, relates to a parameter estimation method, and can be used for radar space target recognition. Background technique [0002] Radar target recognition technology has become an important research direction in today's information field. Space target detection, identification and surveillance capabilities embody the country's space power and space strategy, and are an important part of the country's strategic power. The basic theories and technical approaches for space target recognition include: recognition based on motion features, broadband ISAR imaging recognition, recognition based on polarization features, statistical recognition based on RCS sequences, etc. In recent years, motion features have increasingly highlighted their importance in target detection and recognition. [0003] A complete description of a target's motion characteristics includes multiple parameters such as position, velocity...

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Problems solved by technology

[0007] Although the above solution can effectively estimate the precession parameters of the cone target, this method is only applicable to the precession of the cone target. The motion parameters of will not be accurately estimated

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