Designing And Accomplishment Of Antenna Monitoring And Controlling Unit In Spaceborne SAR

With the first high resolution spaceborne SAR( Synthetic Aperture Radar) being explored in China,this paper focuses on the monitoring and controlling of SAR antenna's beam-steering．First,the paper expounds the working principle of a SAR,a phased array antenna and phase shifters of T/R modules．Then,it presents the method of designing and accomplishment of Antenna Monitor and Control Unit(AMCU) with high reliability．Next,the designing of hardware and software used in Monitor and Control Computer(MCC) are being discussed．Last,the paper presents the simulating and analyzing of two key circuits .High reliability is deadly request in the designing of products used in space environment．When we design AMCU of spaceborne SAR,we employ certain techniques to provide increased reliability and stability．Such as inactive double redundant reserve technique,differential line driver been used in long line transmission,radiation hardened semiconductors been selected,the software used in Monitor and Control Computer (MCU) have a capacity of false toleration,distributing and calculating of reliability,and design of electromagnetism compatibility．Spaceborne SAR is a integer system of many electronic equipment．The function of units and modules should been simplified．The cable between modules should be the least．The weight should be the lightest．The cubage should be the smallest．And the power dissipation should be the lowest．In order to avoid weakness points,we should forecast,calculate,and distribute the reliability at the same time when designing functions of the system．To design the system with thinking of electromagnetism compatibility. All these should be done to ensure the system running reliably within two years．...