Time-Dependent Generalized Normalized Radar Cross Section for Improved SAR Performance
Abstract
The time-dependent Generalized Normalized Radar Cross Section (G-NRCS) is introduced using its time-harmonic version in conjunction with the frozen-surface assumption. The linear ocean-surface model is utilized along with the associated statistical relationships to yield an expression for a fully developed sea. The ratio of the surface displacement and the EM wavelength of the incident field is assumed to be very small compared to unity. Based on this property, the Small Amplitude Approximation (SAA) is employed to describe the scattering behavior of the sea surface and, thus, the Scattering Matrix for a terrain chosen with its necessary components defined in detail. These expressions are employed here to yield the time-dependent G-NRCS under SAA. This quantity is should be well suited for Synthetic Aperture Radar (SAR) applications where the sea-surface reflectivity is required at every point within the antenna footprint corresponding to a given pixel in a SAR image of the ocean surface. The application of the expressions derived here holds the promise of improved SAR imaging performance for the detection of ships in sea-clutter environments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 2022
- Accession Number
- AD1186089
Entities
People
- Jimmy O. Alatishe
Organizations
- United States Naval Research Laboratory