Performance envelope of 3D spotlight SAR across different data models, flight profiles, and imaging

Matthew Pepin

doi:10.1117/12.2662244

13 June 2023 Performance envelope of 3D spotlight SAR across different data models, flight profiles, and imaging

Matthew Pepin

Proceedings Volume 12520, Algorithms for Synthetic Aperture Radar Imagery XXX; 1252004 (2023) https://doi.org/10.1117/12.2662244
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

The achievable performance of Synthetic Aperture Radar (SAR) localization and imaging is limited ultimately by that of the noise-free phase history data acquisition and imaging. Noise and motion errors (not investigated here) can only degrade from this performance. The range of parameters corresponding to good performance constitute an envelope of good performance. Point Scatterer location, accuracy, resolution and focus (IPR or Impulse Response) vary across the parameters of frequency, bandwidth, stand-o§ range, number of spatial (array) and temporal samples, and linear or circular áight path and their squint angle from broadside. Practical point source localization uses an iterative process to identify point source volume cell (voxel) centers and precisely locating these within the voxel by applying a damped exponential estimate of the ideal point source. Measurements between each dimension of a grid of point sources determines any distortion of the 3D image volume and IPR determines any change in focus over the grid points in the volume. IPR measurements are made with a search for the half-amplitude point of the main lobe width of the Point Scatterer response in each dimension. The performance of SAR parameters is measured for a spherical array model of level circular áight paths and their linearized alternatives. The phase history data are modeled with both single and multiple direct rays reáecting from idealized point sources or corner reáector as well as a spherical di§erential range model. Performance di§erences due to di§erent combinations of phase history data collection and imaging techniques are cataloged.

Conference Presentation

Citation Download Citation

Matthew Pepin "Performance envelope of 3D spotlight SAR across different data models, flight profiles, and imaging", Proc. SPIE 12520, Algorithms for Synthetic Aperture Radar Imagery XXX, 1252004 (13 June 2023); https://doi.org/10.1117/12.2662244

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