Abstract:

This paper analyzes the basic theory of the DAGC monopulse radar receiver,gives the digital realization methods as well as the structural and block diagram of corresponding hardware and software of the sensitivity time (STC) control,manual gain control and automatic gain control.Besides,on the basis of practical experience it discusses several problems such as fluctuation in attenuation,the shock oscillation in the IF circuit caused by the NC attenuator,the channel gain of frequency agility state and the realization of gain control for the receiver by the digital AGC technology,all of which should be considered in the engineering design of the digital AGC.The solutions to these problems are also given.

Key words: DAGC technology;sensitivity time control digital automatic gain control;attenuators;FPGA