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Title: Radar velocity determination using direction of arrival measurements

The various technologies presented herein relate to utilizing direction of arrival (DOA) data to determine various flight parameters for an aircraft A plurality of radar images (e.g., SAR images) can be analyzed to identify a plurality of pixels in the radar images relating to one or more ground targets. In an embodiment, the plurality of pixels can be selected based upon the pixels exceeding a SNR threshold. The DOA data in conjunction with a measurable Doppler frequency for each pixel can be obtained. Multi-aperture technology enables derivation of an independent measure of DOA to each pixel based on interferometric analysis. This independent measure of DOA enables decoupling of the aircraft velocity from the DOA in a range-Doppler map, thereby enabling determination of a radar velocity. The determined aircraft velocity can be utilized to update an onboard INS, and to keep it aligned, without the need for additional velocity-measuring instrumentation.
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Issue Date:
OSTI Identifier:
National Technologies & Engineering Solutions of Sandia, LLC (Albuquerque, NM) SNL-A
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2015 Mar 11
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
Country of Publication:
United States

Works referenced in this record:

An Integrated Navigation System Using GPS Carrier Phase for Real-Time Airborne/Synthetic Aperture Radar (SAR)
journal, March 2001

Estimating the Doppler centroid of SAR data
journal, March 1989
  • Madsen, S. N.
  • IEEE Transactions on Aerospace and Electronic Systems, Vol. 25, Issue 2, p. 134-140
  • DOI: 10.1109/7.18675