With the increasing demand for high-precision positioning technology in the aerospace field,a positioning system based on satellite positioning and Beidou short message technology was designed to solve the problem that the data memory could not be quickly recovered in large-scale flight tests.The system is started before the aircraft is separated,and the position information is obtained in real time through the Beidou BDS module,and after separation, the Beidou short message is used to send signals to the ground terminal.The design of the antenna has a great impact on the ability to transmit and receive the signal,through the patch design of the antenna using microstrip laminated structure and double rectangular bevel cutting,the dual-frequency circular polarization radiation is realized,with good vertex gain,low elevation gain and excellent band isolation performance,to ensure the transmission reliability of the Beidou signal,through the test verification,the positioning error is less than 5meters,and the maximum packet loss rate of short message communication is 4.41%,which meets the design requirements.