Exploration Of Microwave Staring Imaging And Study On Its Key Device

With the rapid development of science and technology,information warfare and electronic warfare have become the main forms of modern war,the key to decide win or lose is dynamic real-time surveillance and process about the battlefield,but the existing various imaging radars' detection ability is bounded by the antenna aperture,which leads to no fundamental breakthrough in the ability of distinguishing the signals from different positions in the integrated electromagnetic signals received and has been insufficient to meet the resolution requirements of the current electronic surveillance.The thesis proposes a novel microwave staring imaging scheme after the in-depth research and exploration of radar staring imaging methods and techniques under the long-term support of the overall research and development center of the General Armament Department.The core idea of the scheme is multi-state noncorrelation modulation of the multi-signal wavefront by wavefront modulator before the wave is received.On the basis of different nonlinear state modulated signal,after numerical calculation and error analysis,we can sense the precise orientation of different waves in the integrated electromagnetic signal which will obtain with difficulty by the existing non-interference linear theoretical framework.so then we transform the problem of enlarging antenna's aperture into the performance of plasma modulator skillfully,and establish new imaging scheme based on azimuth wavefront modulation.In order to realize the core technology of azimuth wavefront modulation,a key device which can realize non-correlated modulation function must be developed.The main work of this thesis is to study how to make controllable,large dynamic,elaborate noncorrelation modulation by using plasma,that is manufacture technology of the plasma nonlinear modulator of the new staring imaging scheme's key components.We originality choose to study cylindrical plasma which has obvious electromagnetic scattering effect,and constantly adjust the gas pressure atmosphere and distribution uniformity ratio of plasma modulator through the theoretical calculation and experiment test.This paper also invents a novel series resonant capacitance coupling incentive structure.Through experimental tests,the built plasma modulator can realize radar wave signal amplitude modulation of 0~4dBm and phase modulation of 0~45° at Ku band,while the plasma exciting power of 0~500w.This thesis also establishes the corresponding system test platform by using the developed plasma modulator.In the complex scene of 200 square meters(20 meters by 10 meters),We realize the resolution of 0.15 m in the main beam receiving range at Ku-band,which means equivalently antenna aperture is increased 102 times in traditional radar scheme and 10 times clearer than the best super-resolution radar currently available,thereby successfully breaking through the resolution limit of the telescope,radar,electronic detection system and electron microscope greatly.