| In high resistance electromagnetic environment, how to raise anti-jammingcapability of guidance radar is one of the important problems to be solved. In view ofthe advantages such as high range resolution and high data rate, the phased arrayHPRF-SF (High Pulse Repetition Frequency-Stepped Frequency) has a wide field ofapplication, particularly in precise guide of hypersonic weapons, according to whichhas a great significance in research of Anti-jamming method.Aimed at hypersonic guided weapons applications background and phased arrayHPRF-SF system, the method of main-lobe jamming suppression and the method oftarget angle parameter estimation in jamming background have been studiedsystematically in this thesis. Based on the main-lobe jamming suppression method ofthe traditional four-channel (sum, elevation-difference, azimuth-difference,double-difference channel) and single interference source, this paper studied andproposed digital implementation of a variety of auxiliary channel (Other virtualauxiliary channels not including the traditional four-channel are carried out by digitalprocessing), main-lobe jamming suppression method of two jamming source based onauxiliary channel and target angle measurement method in jamming background.In this paper, the mainly research work includes:(1) In connection with the application of the missile-borne phased arrayHPRF-SF radar system and the main-lobe jamming suppression, various mathematicalmodels such as the target signal model and the jamming signal model in sub-arraylevel and multi-channel level have been established.(2) The estimation method of the number of spatial jamming source based ontraditional single channel correlation canceling has been researched and proposed.Aimed at the case of two jamming sources suppression in beam main-lobe, theineffectivity of traditional single channel correlation canceling in the condition of twojamming sources has been analyzed and the auxiliary channel design method and themethod of main-lobe jamming suppression based on multi-channel correlationcanceling have been raised. The results have showed that the method can suppress themain-lobe jamming suppression effectively.(3) The method of the calculation of mono-pulse ratio based on modified sum,difference channel signal under jamming condition and the method of target angle measurement based on the fitting a straight line of mono-pulse ratio function havebeen researched and proposed. Theoretical analysis and simulation results haveshowed that the method can suppress main-lobe jamming and meanwhile preserveundistorted mono-pulse ratio. |
PDF Full Text Request