A. Moreira et Yh. Huang, AIRBORNE SAR PROCESSING OF HIGHLY SQUINTED DATA USING A CHIRP SCALINGAPPROACH WITH INTEGRATED MOTION COMPENSATION, IEEE transactions on geoscience and remote sensing, 32(5), 1994, pp. 1029-1040
This paper proposes a new approach for high-resolution airborne SAR da
ta processing, which uses a modified chirp scaling algorithm to accomm
odate the correction of motion errors, as well as the variations of th
e Doppler centroid in range and azimuth. By introducing a cubic phase
term in the chirp scaling phase, data acquired with a squint angle up
to 30-degrees can be processed with no degradation of the impulse resp
onse function. The proposed approach is computationally very efficient
, since it accommodates the variations of Doppler centroid without usi
ng block processing. Furthermore, a motion error extraction algorithm
can be incorporated into the proposed approach by means of subaperture
processing is azimuth. The new approach, denoted as extended chirp sc
aling (ECS), is considered to be a generalized algorithm suitable for
the high-resolution processing of most airborne SAR systems.