Mensuration for the conformal range migration algorithm

Details Mensuration for the conformal range migration algorithm Mensuration for the conformal range migration algorithm

2006-11-28

2006-11-28

Tarcza, Thomas H. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

C342S02500R, C342S02500R

Reexamination Certificate

active

07142149

ABSTRACT:
A radar system is mounted on a moving platform moving along a great circle. The radar comprises a radar receiver for digitizing radar returns having a phase from a scatterer (target) in a scene. A computer focuses the phase of the radar returns from the scatterer in the scene, using cylindrical coordinates to arrive at an image. An initial position estimate of the scatterer (target) within the image is made. This initial position is converted from cylindrical coordinates to geodesic coordinates of initial latitude, initial longitude and initial elevation. The geodesic coordinates are used to compare with a database descriptive of earth's surface. The initial elevation is replaced with that contained in the database. A second scatterer (target) location is computed using the database elevation. The second target location is compared with the first target location to obtain a difference. If the difference is above a threshold, the second scatterer location is substituted for the initial position estimate. This is iterated until the scatterer location difference is less than the threshold.

REFERENCES:
patent: 6384766 (2002-05-01), Ulander
patent: 6809681 (2004-10-01), Niechayev
patent: 2005/0073455 (2005-04-01), Chow et al.
Marechal, “Tomographic Formulation of Interferometric SAR for Terrain Elevation Mapping”, IEEE Trans. on Geoscience and Remote Sensing, vol. 33, No. 3, May 1995. pp. 726-739.

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