超宽带收发系统设计与调试

【作者】 张永胜；

【导师】 常文革；

【作者基本信息】 中国人民解放军国防科学技术大学 ， 信息与通信工程， 2002， 硕士

【摘要】 工作于VHF／UHF波段的超宽带合成孔径雷达(UWB SAR)具有穿透叶簇(或地表)对隐蔽目标进行高分辨成像的能力。本文以机载叶簇(地表)穿透UWB SAR试验系统为背景。重点讨论了超宽带收发系统设计与调试技术。 本文首先针对超宽带收发系统的特点讨论了宽带、低失真系统的设计技术。并对收发系统中的重点单元电路进行了分析。讨论了超宽带收发系统的误差，并提出了收发系统误差的补偿方法。设计实现了300MHz带宽超宽带接收机的正交解调部分。带内幅度波纹为1.5dB，I、Q幅相不平衡度为0.2dB／2°。实践证明，该解调器完全能够满足机载UWB SAR系统的实用要求。更多还原

【Abstract】 Ultra-WideBand synthetic radar (UWB SAR) in VHF/UHF band features the capability of foliage ( ground) penetration and high resolution imaging of concealed targets. The design and debugging technology of the UWB transmit-receive system is discussed in this thesis against the background of the "study on air-borne foliage (ground) penetration UWB SAR system" project.The design technology of wide band and low distortion system is discussed according to the characteristic of UWB transmit-receive system. Some of the important circuit units are analyzed. An error compensating method is put forward after the UWB transmit-receive’system error being discussed.The UWB SAR quadrature demodulation receiver reaches very high performance within 300MHz bandwidth: the amplitude ripple is 1.5 dB and the IQ imbalance is 0.2dB/2°. It entirely fulfilled the air-borne UWB SAR system’s requirements.更多还原