**Amplitude sum-difference signal
processing in synthetic aperture radars for mapping surface topography **

*V.K. Volosyuk, A.V. Yeremeyev,
V.V. Pavlikov*

The
problem of statistical optimization of signal processing in synthetic aperture
radar for mapping surface topography is investigated. The method for direction
finding of surface elements based on monopulse
amplitude comparison of the sum and difference signals from the two antennas
with directivity patterns displaced in the goniometric plane is considered. The
maximum likelihood approach is used to synthesize an optimal algorithm for
direction finding of surface elements. Monopulse
comparison of signals is followed by coherent accumulation of signals that
allows antenna aperture synthesis in the azimuthal
direction.

**Key words:** mapping, direction finding, height
of the relief, interferometric SAR, amplitude
sum-difference SAR, optimal processing.