Design And Implementation Of Wideband Receiver For Imaging Radar

Modern radar is an important tool of air defense warning,battlefield surveillance,shooting range measurement.The target motion state measurement of radar systems cannot fully adapt to the new requirements of the battlefield situation awareness,target attribute identification,and more precise target parameter measurement.Microwave imaging technology with the large antenna aperture and wideband signal has become an important trend in the development of modern radar.Microwave imaging technology requires multi-channels,high bandwidth and high dynamic demand of radar receiver.In the national weapons range,the missile range to carry out multiple firing test,projectile target deviation,projectile dispersion,burst point density measurement is urgent new subject.Commonly used inverse GPS CDMA integrated measuring technology,stereo cloth station short baseline interferometer technology,multi station Doppler Doppler measurement technology,wide field optical measurement technology measurement method,due to the small cross section of target,weather conditions,narrow field of view,factors,different degrees of restricted to use.A large array of real aperture imaging radar can overcome many unfavorable factors,tactical parameters fast measurement of multiple small targets.With the background of high-speed moving multi-targets imaging to measure,according to the imaging array radar technology,this paper analyzes the multi-channels broadband receiver technology and solves some technical difficulties in designing thewideband receiver with multi-channels high dynamic range.These difficulties include the use of STC technology to solve the large dynamic range requirements,with gain control and phase modulation to solve the multi-channels amplitude phase consistency problem,with increasing bandwidth of receiver to solve the signal flatness requirements.These methods provide a design idea for future wideband radar development.After theoretical research and practical engineering design,32 channel wideband receiver is developed.After laboratory testing,high discharge and medium to meet its technical specifications,and finally installed on the radar,the field test to verify its technical indicators to achieve a large array of imaging radar receiver technical requirements.This paper uses analog wideband receiver,digital video signal sampling.Through the development of the large array wideband receiver,a than the intermediate frequency sampling and high frequency sampling in the cost lower,and the indicators meet the use requirements of the wideband radar receiver,for mass production and equipment.