Abstract
In a wideband radar, a true time delay line (TTDL) is used to compensate for the propagation delay that has a different value according to the operational frequency. This study analyzes the antenna pattern characteristics of wideband synthetic aperture radar (SAR) that does not require any TTDL. In addition, it defines an antenna pattern to compensate for beam dispersive effects and a method to improve the range ambiguity to signal ratio (RAR). Considering the altitude change that occurs in a SAR satellite, this paper proposes a method to optimize the operational parameters and consequently enhance the RAR performance. The proposed method uses altitude-dependent equations to calculate the operational parameters; hence it can be easily applied to the real operation of a SAR satellite. The RAR analysis for operational altitude variation of 35 km shows that an improvement of approximately 2.1-dB, 0.9-dB, and 2.1-dB is achieved at the stripmap, wide-swath, and high-resolution modes respectively. The RAR is improved to comply with the requirement in the stripmap mode, whereas the wide-swath and high-resolution modes have a sufficient margin.
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