Ultra-low-altitude target analysis and multipath echo modeling method for missile-borne multi-channel radar

Abstract

The invention discloses a bomb-borne multi-channel radar ultra-low-altitude target analysis and multi-path echo modeling method, which mainly solves the multi-path echo modeling problem existing when the bomb-borne radar measures the sea surface ultra-low altitude target. The implementation steps are as follows: constructing the multipath echo geometric configuration; dividing the effective scattering area of ​​the sea surface; calculating the Brewster reflection coefficient of the sea surface; calculating the equivalent scattering coefficient of the scattering unit; establishing a complete multi-channel multipath echo signal model. The multipath signal model constructed by the present invention has both the target signal and a large number of multipath echo signals in different directions. Compared with the existing multipath echo modeling method, the effective scattering area of ​​the sea surface is divided, and the scattering in the area is analyzed. Features, using the double-base equivalent theory and the Brewster effect, accurately expresses the objective environment of the target, improves the detection performance of the missile-borne radar in subsequent signal processing, and provides support for the multi-channel missile-borne radar system design and target detection.

Description

technical field [0001] The invention belongs to the technical field of radar, and mainly relates to multipath echo modeling, specifically a method for analyzing ultra-low-altitude targets of missile-borne multi-channel radars and modeling methods for multi-path echoes, which can be used for missile-borne multi-channel radars to detect low-altitude sea surfaces Target. Background technique [0002] The system design and signal processing of missile-borne phased array radar to realize low-altitude target detection is a key technology of the next generation active radar seeker. Compared with airborne early warning radar, missile-borne radar adopts forward-looking array with fast movement speed and short working wavelength. Especially for the detection of low-altitude targets on the sea surface, the echo signal received by the seeker includes not only the direct path signal of the target, but also the multipath signal formed by the target reflected by the ground and sea surface...

AI Technical Summary

Problems solved by technology

However, the modeling method is relatively simple and does not take into account the complex situation of the sea surface

[0006] Thomas Meissner and Frank J. Wentz in the paper "The Complex Dielectric Constant of Pure and Sea Water From Microwave Satellite Observations" (IEEE Transactions On Geoscience And Remote Sensing, VOL.42, NO.9, pp.1836-1849, Sept.2004) Introduced the Brewster effect in detail and analyzed the factors affecting the dielectric constant of seawater, but did not involve practical engineering applications

[0007] In short, the previous multipath echo modeling method is simple to implement, does not consider the characteristics of the sea surface scattering area in the actual situation, and does not analyze the influence of the Brewster effect and the sea surface scattering model on the multipath echo. The model approximation error is large and the deviation of statistical characteristics is large, which will cause error impact on the analysis and detection of low-altitude targets in the later stage in actual processing

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