Doppler centroid estimation ambiguity for synthetic aperture radarsA technique for estimation of the Doppler centroid of an SAR in the presence of large uncertainty in antenna boresight pointing is described. Also investigated is the image degradation resulting from data processing that uses an ambiguous centroid. Two approaches for resolving ambiguities in Doppler centroid estimation (DCE) are presented: the range cross-correlation technique and the multiple-PRF (pulse repetition frequency) technique. Because other design factors control the PRF selection for SAR, a generalized algorithm is derived for PRFs not containing a common divisor. An example using the SIR-C parameters illustrates that this algorithm is capable of resolving the C-band DCE ambiguities for antenna pointing uncertainties of about 2-3 deg.
Document ID
19910031314
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chang, C. Y. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Curlander, J. C. (JPL Pasadena, CA, United States)