Abstract
This paper proposes the phase error compensation algorithm of the wide band chirp generator for the synthetic aperture radar (SAR) use. The proposed algorithm dynamically calculates the phase error of transmitting chirp to reduce spurious of signal. In addition, it uses the curve fitting method and feedback when the desired signal are set by user. Numerical results show that the proposed algorithm can enhance the impulse response function (IRF) results such as the peak to side-lobe ratio (PSLR) and the integrated side-lobe ratio (ISLR) up to −0.1561 dB and −0.0548 dB respectively. Furthermore, the spurious has been reduced by compared to the conventional direct digital frequency synthesizer (DDFS) chirp generators.
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