| Abstract: | 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. |