Multichannel fusion detection method for distance extension targets under partially uniform environment

Abstract

The invention discloses a multichannel fusion detection method for distance extension targets under partially uniform environment, and belongs to the field of radar signal processing. According to themethod, a partially uniform multichannel auto-regression signal model is established for the condition of globally uniform auxiliary data missing caused by abnormal value conditions such as clutter edge and the like, so that local uniformity of clutter spaces, time low-order relevancy and multichannel information obtaining ability are sufficiently fused, the utilization rate of clutter prior information is effectively improved and a data model foundation is laid for auxiliary data demand of self-adaptive distance extension target detection; the multichannel fusion detection method for distance extension targets under partially uniform environment is established on the basis of a Rao test criterion, so that the auxiliary data demand is greatly reduced while the characteristic of constant-false alarm rate is ensured; and being compared with the common generalized likelihood ratio criterion method, the method is capable of simplifying the parameter estimation process while remaining thedetection performance unchanged, so that the detector construction efficiency is improved and the method is strong in engineering applicability and has popularization and application values.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a multi-channel fusion detection method for a distance-extended target in a partially uniform environment. Background technique [0002] High-range-resolution radar has a wide bandwidth and high range resolution, and has obvious advantages in precise detection, imaging, and target recognition. It has become an important direction for the development of modern radars. The target echo signal of traditional low-range resolution radar usually only occupies one range unit, and is often treated as a "point target". Different from "point targets", the echo signals of common high-range resolution radar targets not only occupy one range unit, but are distributed in different radial range units, forming a "range-extended target". With the wide application of wideband technology in the field of radar, the problem of adaptive detection of range-extended targets is receivin...

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Problems solved by technology

However, for outliers such as clutter edges faced by actual radars, the global uniformity of the clutter background is destroyed, and it is sometimes difficult to obtain auxiliary data that satisfies global uniformity, which seriously affects the adaptive detection performance of range extension targets

[0004] In fact, although the global uniformity of the complex clutter background is destroyed, the local uniformity of the clutter is still reflected within a certain radial distance range. At this time, the partially uniform model can be used to model the clutter, namely The clutter components in the range unit and the reference range unit have the same covariance matrix structure and different power levels. This model can make full use of the local uniformity of the clutter, but the number of available reference range units is limited by the actual clutter Non-uniformity

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