Research On The Transceiver Front-end Of Missile-borne Chirp Continuous Wave Radar

Nowadays,radar has been widely used in reconnaissance,mapping,guidance,fire control,collision prevention,meteorology and other military and civilian fields.This paper studies the RF front end for missile-borne altimeter,and the main work includes:(1)Based on the comparison of the existing missile-borne altimeter technology implementation schemes,the K-band missile-borne linear frequency modulated continuous wave system was determined in this project.According to the practical application background and technical requirements,the RF front-end scheme selection and key module parameter index calculation and simulation were completed.(2)Design of one-wire and double-receivable microstrip array antenna.Aimed at Angle measuring requirements,combining spatial structure,USES the sniper double microstrip array antenna,the antenna array and group array way design and parameter optimization based on simulation,in view of the small size under the transceiver isolation brush good question,used in the middle of the sending and receiving antenna loading defect ground structure(DGS)to increase the degree of isolation,effectively restrain the electromagnetic coupling between the sending and receiving antenna to each other,The isolation degree is improved by nearly 20 d B,and the antenna array element is further reduced by opening V-shaped slots.(3)Band-pass filter design.A baseband integrated waveguide(SIW)band-pass filter was designed to meet the requirement of RF front-end frequency passband selection.The band-pass range was 23.95～24.3GHz through policy and parameter optimization.Substrate integrated waveguide(SIW)band-pass filter has been fabricated and tested.The test results are in good agreement with the simulation and meet the requirements.(4)Active circuit design.The design of power amplifier synthesis circuit,low noise amplifier circuit and other transceiver modules was completed by using a single and double receiving linear frequency modulation chip CHC2442-QPG as the core,and the circuit processing and fabrication were completed.The test results basically met the design targets.