| With the development and improvement of Beidou satellite navigation system(BDS),more and more relevant researches about satellite navigation system are carried out.The satellite navigation system can provide three-dimensional position and time information all day and all day,providing people with great convenience in production and life;With the acceleration of the solution speed and the improvement of the positioning accuracy of the satellite receiver,a growing number of functions and services are developed depending on the satellite positioning and navigation technology.The study of Beidou or GPS dual-mode differential positioning system,which takes a significant role in the application and promotion of Beidou navigation system in various industries,is conforming to the development of the satellite positioning and navigation industry.According to the carrier phase difference method,a centimeter level satellite positioning is achieved,which has good development prospects in the fields of geodesy,vehicle navigation,precision agriculture,aerospace measurement and control,engineering measurement and military application.As an important part of positioning system,satellite navigation antenna has a very important impact on positioning accuracy.Generally,it also requires the antenna to have the characteristics of miniaturization,zero phase center,wide beam,and so on.The research of satellite navigation antenna with appropriate size and excellent performance are also conducive to the better development of satellite positioning and navigation industry,so satellite navigation antennas have become the focus of this paper.The paper mainly includes the following contents.The different schemes adopted by Beidou and GPS system in general precision positioning and high precision positioning are studied,and the differential positioning method used in high precision positioning is mainly introduced,including the system composition,working principle and application in relative positioning attitude measurement.The general design requirements of navigation antennas,common implementation methods and influencing factors of miniaturization of satellite circularly polarized antennas are introduced,and a miniaturized method suitable for microstrip patch antennas is proposed,that is,through short-circuit strip loading,it can be effectively reduced Antenna radiation patch size,and this method was used to design a miniaturized satellite navigation antenna with a slotted floor.The antenna radiation patch size is 0.11 wavelength.After actual measurement,the return loss is less than-10 dB in the operating frequency band.Better circularly polarized radiation performance,strong navigation satellite signal reception capabilityIn the thesis,a satellite navigation antenna using center feed is proposed,and the method of circular polarization radiation is achieved by reference to 90° bridge feeding.The antenna adopts a self-phase shift method to achieve circular polarization radiation characteristics,and also uses short circuit loading The antenna has a smaller size.After actual measurement,the antenna performance is better,which is in line with the simulation results and meets the needs of the differential positioning system.Through the construction of the hardware of the differential positioning system and the configuration of the software for differential data processing;the test and analysis of the differential positioning system are completed.The results show that the Beidou/GPS dual-mode differential positioning system proposed in this paper has good ranging and direction finding capabilities,and it has also verified The correctness of the two navigation antenna design methods proposed in this article. |
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