| Synthetic aperture radar (SAR) is a kind of airborne or spaceborne microwave imaging radar. Its all-weather, day and night imaging capabilities coupled with the achievable high resolutions make it a fundamental instrument for planet observation from far distance in military and civilian fields widely. In practice, antenna is one of the most important, complex and expensive parts in SAR system. It can say that, the study of antenna is the most fundamental, also the most important work, for the development of multi-band, multi-polarization, multi-modes, high resolution and wide swath SAR systems. Therefore, the investigation of SAR antenna is very significant and challenging.With the new technologies and new modes being successively proposed in the field, the SAR antennas are mainly investigated in the thesis. It includes the design of shaped beam of antenna array, the design of the dual-polarization microstrip patch of dual-polarization SAR, the simulation and analysis of dual-band arrays and their electromagnetic coupling in the same radome, the optimization of antenna gain and Ambiguity-to-Signal Ratio (ASR) of spaceborne SAR based on the antenna array weighted technology and the radiation pattern synthesis of wide swath SAR antenna array.After analyzing the radar echoes of wideswath airborne SAR, the expression of radiation shaped pattern in the range plane is induced. The exciting magnitude and phase of five elements and six elements in the linear array are obtained with the Schelkunoff's unit-circle method combined with null filling and modern evolutionary...
|
PDF Full Text Request