A Plane Wave Equivalent Model for Forward Scatter Shadow Ratio in Spherical Wave and Its Application in Shadow Profile Retrieval

Abstract

The forward scatter shadow ratio (FSSR), a novel parameter in forward scatter radar (FSR) systems, has been introduced recently for a plane wave. In contrast to conventional parameters like the forward scatter cross section (FSCS), FSSR utilizes the total electric field, providing a direct indicator of signal deviations from the direct path. This study overcomes the limitations of the current FSSR model by conducting a comprehensive mathematical and numerical analysis for a spherical wave with the Kirchhoff diffraction formula. By incorporating a point source and moving targets, this approach extends the application scope of FSSR. A plane wave equivalent model is derived and compared to the point source model, demonstrating its accuracy in various scenarios. The optimization method for target shadow profile retrieval in moving targets is discussed using the plane wave equivalent model. It is suggested that employing dual receivers can eliminate the ambiguity associated with target localization and enhance shadow profile retrieval precision.

Keywords

• Forward scatter radar
• forward scatter shadow ratio
• shadow profile
• diffraction