【作者】 董骞；

【导师】 张平；

【作者基本信息】 中国科学院研究生院（电子学研究所） ， 通信与信息系统， 2007， 博士

【摘要】 合成孔径雷达的发展趋势是多波段、多极化、多模式、智能化、小型化。软件无线电技术有可能极大提高合成孔径雷达的性能与灵活性，具有重要的理论意义与应用价值。论文探讨了软件无线电在合成孔径雷达中的应用，并着重深入研究了基于软件无线电的合成孔径雷达数字接收机。论文中包含了与实际应用密切联系的工程设计，还涉及到对当前的热点问题的预新研究。主要研究内容和创新性贡献包括：[1]提出一种新的分类方法，将正交解调算法分为两大类：有混频算法和无混频算法。分析相同回波数据量下各种正交解调算法的计算量和对成像性能指标的影响，选择最优算法为合成孔径雷达数字接收机提供设计参考。[2]改进传统的Hilben滤波正交解调算法，改进算法极大的提高了Hilbert滤波法的运行效率。[3]根据四种不同的数字接收机体制，完成了可适用于合成孔径雷达接收机中频数字化的软、硬件设计，该设计可实现性强，仿真验证表明，基于软件无线电的合成孔径雷达数字接收机的性能指标优于模拟接收机。[4]论文讨论了射频数字接收机方案，其优点在于极大提高了接收机配置的灵活性。[5]将软件无线电的设计理念引入合成孔径雷达，阐述了基于软件无线电的合成孔径雷达体系结构；探讨了该体系结构的开发和实现方案。更多还原

【Abstract】 The trend of synthetic aperture radar is a small-scale and intelligent radar with multiplefrequency bands, multiple polarizations and multiple modes in the future. It is possible togreatly improve the performance and flexibility of synthetic aperture radar by introducingsoftware defined radio into it. The dissertation the application of software defined radio insynthetic aperture radar in system level and studies deeply digital receiver based onsoftware defined radio. The dissertation includes some engineering implement studyrelating to practically application and forward looking research on current hot topics. Themain works and innovations of this dissertation are as follows:[1] All algorithms of digital quadrature demodulation are divided into two classes.With-mixer algorithms and mixer-free algorithms are proposed according to a newcriterion. The computation cost and performance of different digital quadraturedemodulation algorithm at the same echo signal are analyzed. Provide a designreference for synthetic aperture radar receiver by suggesting optimum algorithm.[2] The conventional Hilbert quadrature demodulation algorithm is improved. Theimproved algorithm enhances algorithm efficiency greatly.[3] The digital intermediate frequency receiver architecture of synthetic aperture radar isproposed based on four different digital receiver architectures. The appropriatesoftware and hardware design is implemented. The simulation and verification showthat the performance of digital receiver in synthetic aperture radar is better than that ofanalog receiver.[4] A digital radio frequency receiver theme with great flexibility is proposed.[5] The theory of software defined radio is introduced into synthetic aperture radar. The architecture of synthetic aperture radar based on software defined radio is analyzed andsuggested. The realization of the architecture is discussed.更多还原