Patent ID: 8947292
Filing Date: 2015-02-03
Classification: G01S

Abstract:
1. A radar system for a synthetic aperture radar, comprising: an arrangement comprising at least one transmitter, two receivers, two antennas and a signal processor; a platform on which the arrangement is located, the platform being arranged to move over ground and arranged to transmit a known signal shape and receive signals reflected from the ground, the received signals being used to produce a synthetic aperture radar image of the ground, the synthetic aperture radar image comprising a number of resolution cells, and the radar system being arranged to operate in a frequency band with a center frequency and with a wide bandwidth of at least one octave; a first antenna and a second antenna having a length of less than half a wavelength of the center frequency, wherein a radar system transfer function is arranged to be flat over the frequency band by arranging for signal equalization and pulse compression of the received signals by the signal processor, and wherein one-sided beam forming with wideband antenna gain is arranged utilizing a first receiver channel and a second receiver channel where the first receiver channel is arranged to receive a signal from the first antenna and the second receiver channel is arranged to receive a signal from the second antenna and further by arranging for matching antenna separation, with a phase difference of 2α egrees between the transmit signals arranged to be fed into each antenna, 2α being in the vicinity of 90 degrees.