EFFECTS OF ANTENNA APERTURE PHASE DISTRIBUTION ON THE SYNTHETIC ARRAY PATTERN AND THE DOPPLER-DELAY RESPONSE

The geometrical relationship between the synthetic aperture radar (SAR) and its an-tenna coordinate system is reviewed briefly. The ideal aperture current distribution of SAR antenna is discussed in theoretical sense. On the basis of results derived by R. C. Heimiller (1962) and R. W. Bayma (1975), the effects of current distribution not in phase on the pattern of synthetic array and the Doppler-delay response are further analysed, and the numerical results calculated in the case of quadratic and cubic phase distributions are given. These results show that such phase distributions will cause the gain of synthetic array and the signal to ambiguity ratio of Doppler-delay response to be decreased. In consideration of these effects, the author proposes his additional remarks on the range of repetition frequency given by R. W. Bayma (1975).