A Modeling Method for Ultra-low Altitude Target and Multipath Echo of Missile-borne PD System Radar

Abstract

The invention discloses a missile-borne PD system radar extreme low-altitude target and multipath echo modeling method. The main idea of the method comprises a step of determining a radar, wherein anextreme low-altitude target is in the detection range of the radar, establishing an extreme low-altitude target multipath propagation space geometric configuration, and determining a scattering area,a step of determining an equivalent single-base radar, calculating a grazing angle of the equivalent single-base radar, and thus calculating a scattering coefficient of the equivalent single-base radar, a step of calculating dielectric constants of a ground surface and a sea surface, then calculating to obtain a reflection coefficient corresponding to the Brewster effect, and calculating a scattering coefficient of the scattering area according to the scattering coefficient of the equivalent single-base radar, and a step of calculating a four-path baseband echo signal received by the radar ata time t according to the scattering coefficient of the scattering area, wherein the four-path baseband echo signal received by the radar at a time t is a missile-borne PD system radar extreme low-altitude target and multipath echo modeling result, and t represents a time variable.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a method for modeling ultra-low-altitude targets and multi-path echoes of missile-borne PD system radars, which is suitable for modeling ultra-low-altitude targets and multi-path echoes and realizing the detection of moving targets. Background technique [0002] When the radar is detecting and tracking the ultra-low-altitude target, the multi-path propagation phenomenon of the target is obvious; when the target is flying on a relatively flat sea or ground, the echo signal received by the radar not only includes the direct path signal of the target, but also includes the The multipath signal formed by the reflection of the ground and sea surface; when the target flies at low altitude, the path difference between the echoes of each path is very small, and the echo signals are superimposed in the same distance unit, and the multipath propagation will cause the regularity of...

AI Technical Summary

Problems solved by technology

However, this method does not consider the non-uniform reflection in the scattering area of ​​the ground and sea surface, so it is difficult to apply in actual situations

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