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Title: IFSAR for the Rapid Terrain Visualization Demonstration

Abstract

The Rapid Terrain Visualization Advanced Concept Technology Demonstration (RTV-ACTD) is designed to demonstrate the technologies and infrastructure to meet the Army requirement for rapid generation of digital topographic data to support emerging crisis or contingencies. The primary sensor for this mission is an interferometric synthetic aperture radar (IFSAR) designed at Sandia National Laboratories. This paper will outline the design of the system and its performance, and show some recent flight test results. The RTV IFSAR will meet DTED level III and IV specifications by using a multiple-baseline design and high-accuracy differential and carrier-phase GPS navigation. It includes innovative near-real-time DEM production on-board the aircraft. The system is being flown on a deHavilland DHC-7 Army aircraft.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM, and Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
766583
Report Number(s):
SAND2000-2690C
TRN: AH200038%%312
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 34th Asilomar Conference on Signals, Systems, and Computers, Asilomar, CA (US), 10/29/2000--11/01/2000; Other Information: PBD: 31 Oct 2000
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; AIRCRAFT; COMPUTERS; DESIGN; NAVIGATION; PERFORMANCE; RADAR; COMPLEX TERRAIN

Citation Formats

BURNS,BRYAN L., EICHEL,PAUL H., HENSLEY JR.,WILLIAM H., and KIM,THEODORE J. IFSAR for the Rapid Terrain Visualization Demonstration. United States: N. p., 2000. Web.
BURNS,BRYAN L., EICHEL,PAUL H., HENSLEY JR.,WILLIAM H., & KIM,THEODORE J. IFSAR for the Rapid Terrain Visualization Demonstration. United States.
BURNS,BRYAN L., EICHEL,PAUL H., HENSLEY JR.,WILLIAM H., and KIM,THEODORE J. 2000. "IFSAR for the Rapid Terrain Visualization Demonstration". United States. doi:. https://www.osti.gov/servlets/purl/766583.
@article{osti_766583,
title = {IFSAR for the Rapid Terrain Visualization Demonstration},
author = {BURNS,BRYAN L. and EICHEL,PAUL H. and HENSLEY JR.,WILLIAM H. and KIM,THEODORE J.},
abstractNote = {The Rapid Terrain Visualization Advanced Concept Technology Demonstration (RTV-ACTD) is designed to demonstrate the technologies and infrastructure to meet the Army requirement for rapid generation of digital topographic data to support emerging crisis or contingencies. The primary sensor for this mission is an interferometric synthetic aperture radar (IFSAR) designed at Sandia National Laboratories. This paper will outline the design of the system and its performance, and show some recent flight test results. The RTV IFSAR will meet DTED level III and IV specifications by using a multiple-baseline design and high-accuracy differential and carrier-phase GPS navigation. It includes innovative near-real-time DEM production on-board the aircraft. The system is being flown on a deHavilland DHC-7 Army aircraft.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2000,
month =
}

Conference:
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  • A national digital terrain matrix (DTM) archive with sub-meter elevation precision and three meter or less post spacing will have numerous commercial government and research uses. The Lockheed Martin Missiles and Space Digital Terrain Elevation Mapping System (DTEMS) will be used to collect a DTM archive with average relative one {sigma} elevation precision of 0.3 meter, average absolute one U elevation precision less than 0.6 meter, and one to three meter post spacing (posting). DTEMS data will satisfy National Map Accuracy Standards (NMAS) contour intervals of one to two meters. DTEMS will also archive orth-rectified digital polarimetric synthetic aperture radarmore » (SAR) imagery with one to three meter resolution. A difference digital terrain matrix (DDTM) is defined as a digital data file containing elevation changes in a DTM. A DDTM archive will be useful for detection and measurement of natural or man made changes in terrain elevation. Using DTEMS to make periodic repeat DTM collections and coherent elevation change detection (CECD) to sense small elevation changes, DTEMS will be capable of resolving elevation changes of a few centimeters. A vector difference digital terrain matrix (VDDTM) is defined as a digital data file containing the X, Y and Z displacements of the ground. Using CECD with a sub-pixel digital image correlation (SPDIC) technique on pairs of DTM`s and radar images collected by DTEMS, it will be possible to measure X and Y ground displacements with resolutions of ten centimeters at posts with spacing of ten meters and measure the elevation (Z) displacement with a resolution of a few centimeters. 8 refs., 6 figs.« less
  • The Rapid Terrain Visualization interferometric synthetic aperture radar was designed and built at Sandia National Laboratories as part of an Advanced Concept Technology Demonstration (ACTD) to 'demonstrate the technologies and infrastructure to meet the Army requirement for rapid generation of digital topographic data to support emerging crisis or contingencies.' This sensor is currently being operated by Sandia National Laboratories for the Joint Precision Strike Demonstration (JPSD) Project Office to provide highly accurate digital elevation models (DEMs) for military and civilian customers, both inside and outside of the United States. The sensor achieves better than DTED Level IV position accuracy inmore » near real-time. The system is being flown on a deHavilland DHC-7 Army aircraft. This paper outlines some of the technologies used in the design of the system, discusses the performance, and will discuss operational issues. In addition, we will show results from recent flight tests, including high accuracy maps taken of the San Diego area.« less
  • No abstract prepared.
  • Abstract not provided.
  • Interferometric SAR (IFSAR) can be shown to be a special case of 3-D SAR image formation. In fact, traditional IFSAR processing results in the equivalent of merely a super-resolved, under-sampled, 3-D SAR image. However, when approached as a 3-D SAR problem, a number of IFSAR properties and anomalies are easily explained. For example, IFSAR decorrelation with height is merely ordinary migration in 3-D SAR. Consequently, treating IFSAR as a 3-D SAR problem allows insight and development of proper motion compensation techniques and image formation operations to facilitate optimal height estimation. Furthermore, multiple antenna phase centers and baselines are easily incorporatedmore » into this formulation, providing essentially a sparse array in the elevation dimension. This paper shows the Polar Format image formation algorithm extended to 3 dimensions, and then proceeds to apply it to the IFSAR collection geometry. This suggests a more optimal reordering of the traditional IFSAR processing steps.« less