Study On Theory For Three-dimensional Cylindrical Scanning Synthetic Aperture Radar Imaging

Synthetic Aperture Radar(SAR) Imaging is developed as a new imaging technique based on the traditional radar system. This technology has various kinds of working modes and high resolution imaging so it receives wide attention from all walks of life. As a particular frequency electromagnetic wave, its inimitable penetrability and performance of reflection make it used widely, particularly, the trait of this kind of wave is harmless to the human body which broadened its application in the market. This article mainly unfolds around the millimeter wave cylindrical scanning three-dimensional synthetic aperture radar imaging. The main contents in this thesis are summarized as follows:Firstly, the up-to-date research progresses of the millimeter wave synthetic aperture imaging are addressed. And mainly introduced the passive and active imaging technology, as well as the superior of the active technology compared with the other one.Then, the derivation process as well as the solution of the vector wave theory involved in millimeter wave imaging is described, which started with Maxwell’s equations. And the wave theory is promoted to the synthetic aperture radar imaging. The planar aperture, the most basic one, is developed for the three-dimensional synthetic aperture radar imaging systems. Then the signal model considering the systems is derived, and the sampling criteria, the Point Spread Function and the planar aperture algorithm are proposed.Next, the third chapter of this thesis is the further extension and expansion of the second section. The planar imaging technology has been generalized to circular scanning and further cylindrical scanning imaging systems. And then this paper deduces the sampling criteria and the resolution of the cylindrical scanning three-dimensional synthetic aperture radar imaging systems.At last, this article mainly introduced the application of the active cylindrical scanning three-dimensional imaging system in security scan. This chapter also shows the active cylindrical scanning imaging systems and gives the imaging result of the systems. And then through the analysis of the imaging effect, we found there are some problems existing in this process and as for these problems some feasible solutions are presented.