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  5. Unified structure of the system of interperiod signal processing for radar systems with a meteochannel

Unified structure of the system of interperiod signal processing for radar systems with a meteochannel

D. Atamanskiy
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Description: The interperiod processing system (IPS) of meteorological signals for a radar with a meteochannel is proposed. The structure and features of the construction of its individual elements are considered. It is shown that it favourably differs from the existing ability to reduce the obstructive effects of interferences of different physical origin and better estimates of the parameters of the reflection spectrum from meteorological conditions. The negative effect of interferences of the “local objects (LO)” type is lowered due to the suppression filters (FprMP) with controlled width and depth of the rejection zone, which have better characteristics than those used in existing specialized meteorological radars. Constantly incorporated FprMPs can increase the error of measurement parameters of LO for mixtures that do not contain any interference. A detector of reflections from the LO, which implements the multi-threshold procedure for estimating the composition of the mixture and controls the inclusion (excluding) of the FprMPs, is proposed. The elimination of the negative effects of reflections from point targets and dipole reflectors is realized by the procedure for their detection, with subsequent removal from the package of input impacts to be processed. The basis of the detection algorithm is the polarization differences between meteorological objects and dipoles. The structural scheme of the processing device is proposed and substantiated. Data on its effectiveness are given. Detection of sig-nals from point targets is carried out in the processing of reflections of meteorological forms, which is one of the features of the proposed IPS. Improved estimation of the parameters of the reflection spectrum from meteorological conditions is provided through an improved procedure and modified measurement algorithms. It is shown that the solution of even different tasks of the IPS may contain, in addition to the specific ones, general operations of algorithms for solving other problems. This creates the preconditions for the development of a unified processing system, in which the general operations of various tasks of the IPS are performed only once. The unified structure of the proposed IPS is substantiated, where all tasks are solved on a single basis of adaptive grid filters. It is shown that this structure differs favourably from a number of known structures of Gaussian signal processing.


Keywords: pulsed Doppler meteoradolocator, interperiod signal processing, grid filter, spectral moment estimation, spectral estimation, suppression of interfering reflections from local objects.

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Reference:
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