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Spotlight mode SAR stereo technique for height computation.

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IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society

|January 1, 1997

Summary

This study explores 3-D topographic mapping using stereo synthetic aperture radar (SAR). It details how radar image layover differences can compute terrain elevation, analogous to optical stereo triangulation.

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Area of Science:

Geospatial Science
Remote Sensing
Radar Technology

Background:

Synthetic Aperture Radar (SAR) systems generate images with range and cross-range axes.
Radar image layover, where elevated features appear closer, is a known phenomenon in SAR imaging.
Extracting 3-D topographic information from SAR data is crucial for various Earth observation applications.

Purpose of the Study:

To investigate the feasibility of extracting 3-D topographic information using spotlight mode stereo SAR.
To analyze the relationship between radar image layover differences and terrain elevation.
To derive an expression for height estimation accuracy and discuss scatterer persistence.

Main Methods:

Utilizing spotlight mode stereo SAR data for topographic mapping.
Applying principles analogous to optical stereo triangulation to SAR imagery.
Analyzing radar image layover differences on a pixel-by-pixel basis for height computation.

Main Results:

A method for computing terrain elevation from stereo SAR layover differences was investigated.
A general expression for height estimation accuracy was derived, dependent on range resolution and angular separation.
The trade-off between accuracy and angular persistence of radar scatterers was identified.

Conclusions:

Stereo SAR offers a viable method for 3-D topographic information extraction.
Optimizing data collection trajectories can enhance height estimation accuracy while mitigating scatterer persistence issues.
The study provides insights into the limitations and potential of SAR interferometry for digital elevation model generation.