Phase Compensation System for HF Ground Wave Radar

OSMAR2000 is a phase controlled array ground wave radar and its working frequency is in high frequency band.The working mode of OSMAR2000 is one transmitting channel and eight receiving channels.And the transmitting channel is also a receiving channel when the radar system is working in receiving mode.In order to get wider detecting sector we will employ a new working mode which uses multi-transmitting channels and multi-receiving channels.Then there will be a problem.When the signal passes the channels,it is modulated by the channels,and it will make the radar not normally working.So we need add a phase detecting and compensating system to control the signal phase change.After studying the theory of low frequency phase detecting system and radio frequency phase shifter,a phase detecting and controlling system which working frequency is at high frequency is suggested.The system was composed of analog units such as differential amplifier,capacitor,resister and inducter.