Studies On Key Techniques Of Ultra-wide-band Compact Range Measuring System In Time-domain And System Integration

Researching on Compact Range (CR) has become an important subject in the domain of antenna and RCS measurement, and time-domain measuring techniques applied to system of compact range is one of the aquired achievements. With the method of integration, my colleagues and I have established a time-domain UWB compact range measuring system based on the study at key techniques during several justly past years. A majority of this dissertation could be considered as summing up of the achievements.The dissertation researches the geometry-optics principle of CR collimator and methods for its quiet zone evaluation, together with researching on its illuminator. The dissertation also introduces UWB signal generators in time-domain and ultra-high-speed sampler. Structure of an applicable illuminator, design of a ps-impulse generator, inner and outer schematic circuits of a balanced two-diode microstrip sampling gate are all provided.In details, the dissertation researches the software programming during the system integration, as well as the methods of data processing. Ultimately, some significant applications carried out with the integrated system are presented, involving antenna measuring, RCS measuring and ISAR imaging of targets. Successful applications could be prooves of that functions expected are full-filled by the integrated system.The mothod of moment (MoM) is introduced while analyzing and designing illuminator. This dissertation introduces how to combine Asymptotic Waveform Evaluation (AWE) techniques with MoM. Proper deployment frequency point is dicussed. Especially, the dissertation illustrates how to solve singular integrals with numerical algorithm. Optimum division of integral regions is proposed to calculate sigular integral and to improve efficiency of Gauss-Legendre integral method simultaneously. The dissertation introduces Burrows' integral method additionally, considering its probable usage. Burrows' method is based on Lebesgue measurement, that can be used for calculating high dimension integrals of rapidly undulated or singular functions with an theoretically perfect degrading n-dimensions Riemann integrals to only one-dimension Lebesgue integrals.