Scan-beam synthetic aperture radar（SCANSAR） is proposed to solve the problem that SAR is constrained to a narrow swath by ambiguity limitation.This paper mainly engaged in SCANSAR imaging.SCANSAR operation principle

signal structure

signal parameters and data format are studied carefully befor imaging processing is taken into consideration.Signal processing includes the block data imaging algorithm and the subimages mosaicing algorithm.In block data imaging

two kinds of azimuth algorithms

spectrum analysis algorithm and time domain-frequency domain hybird algorithm

are discussed.In subimages mosaicing

time relation is utilized to clip the subimages and combine them sequentially.Computer simulation

which includes reformatting SEASAT raw data to SCANSAR data

processing block data and combining the subimages to a whole image

verifies the proposed signal format and imaging algorithm.