Radar echo double-component mixed amplitude distribution model parameter estimation method and device

Abstract

The embodiment of the invention provides a radar echo double-component mixed amplitude distribution model parameter estimation method. The method comprises the following steps of: estimating model parameters of each component in a double-component mixed model according to radar echo data; obtaining an empirical CCDF based on a histogram statistical method, and obtaining an initial theoretical CCDFof the echo data according to the estimated model parameters and initial weighting coefficient of each component; determining a CCDF interval range of the echo data, counting all quantiles of the empirical CCDF and the initial theoretical CCDF in the CCDF interval range, and calculating an error between the quantiles; adding a preset step length to the initial weighting coefficient to obtain a new weighting coefficient until the weighting coefficient exceeds a preset range; and taking the weighting coefficient corresponding to the minimum error value as the optimal weighting coefficient of the double-component mixed amplitude distribution model. The method is simple in operation, avoids local optimization, improves the modeling precision of a trailing region, and can be used for radar target detection under the clutter background.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of radar signal processing, in particular to a method and device for estimating parameters of a radar echo dual-component mixed amplitude distribution model, which can be used for radar target detection in a clutter background. Background technique [0002] The radar echo amplitude distribution model describes the time-domain statistical fluctuation characteristics of radar clutter, target echo, and superimposed echo of target echo and clutter. In the field of radar signal processing, it is of great theoretical and practical value to establish an accurate radar echo amplitude distribution model. For shore-based, ship-borne, airborne and other fixed or moving platform radars, the radar echo amplitude distribution model is the main basis for the selection of Constant False-Alarm Rate (CFAR) detection method and threshold setting. For Synthetic Aperture Radar (SAR) on airborne, spaceborne...

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Problems solved by technology

[0013] The embodiment of the present invention provides a method and device for estimating parameters of a radar echo two-component mixed amplitude distribution model, which is used to solve the two-component mixed amplitude distribution model in the prior art The disadvantages of complex parameter estimation operations, falling into local optimal solutions, and low modeling accuracy in trailing areas

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