Abstract
At present, BeiDou-3 Navigation Satellite System (BDS) was officially commissioned, and BDS is widely used in military and civil terminal types of equipment, including missiles, warships, satellites, ships, aircraft, unmanned bicycles, intelligent transportation, etc. In view of the fact that the navigation signal has easily interfered in the process of practical application, this paper designs a 5-array anti-jamming miniaturized antenna with a volume of only 110mm*110mm. The four surrounding BDS-B3 frequency elements are used for anti-interference processing, and the middle BDS-B1 element is used to receive BDS-B1 frequency signals directly, and the final BDS-B3 and BDS-B1 signals after anti-interference processing are controlled by RF switch for final output to improve navigation accuracy and reduce power consumption when there is no interference. Finally, the RF circuit of the antijamming array antenna is studied. By analyzing the key parameters such as noise coefficient, gain and IMD3 ( Third Order Intermodulation ), the design scheme of high performance antijamming RF circuit is determined.
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