ADAPTIVE CORRECTION OF RADAR TRACKING IMAGES
O. V. Sytnik
O.Ya. Usikov Institute for Radiophysics and Electronics of National
Academy of Sciences of Ukraine
The paper is received
on September 20, 2013
Abstract. The problem of adaptive correction the trajectory distortions on the images of earth
surface, which formed by a synthetic-aperture radar (SAR), is discussed. The proposed method belongs to the
class of adaptive self- focusing methods, in which the information about trajectory
errors retrieves from reflected sounding signal. As information parameter we
used the estimates of the Doppler’s spectra displacement averaged through slant
range.
To estimate
the phase in a supporting function during the SAR maneuvering has used
the
higher derivatives on the instantaneous slant range. It gave the
opportunity to build the adaptive algorithm which could automatically
correct not only flight velocity errors, but the acceleration
and jump errors too. The results of SAR’s signal processing are presented. The
features of signals processing in different conditions and implementation of
proposed method are discussed. Fig.: 11. Ref.: 12 pos.
Keywords: Coherent Radar, Doppler Spectra, Distortions, trajectory errors, Radar’s Image of Surface, Synthetic
Aperture Radar (SAR).