Development Of Zero Phase Antenna Base On Satellite Navigation Measurement

Based on the actural project requirements,this paper designs a zero phase difference antenna with high phase center stability and high capability of restraining multipath.Firstly,the theoretical knowledge of microstrip patch antenna is studied.Due to the characteristics of the satellite receiving antenna and the actual use of the convenience of the need,the measurement of the antenna is mostly used in the form of microstrip patch antenna.Aiming at the problem that the single feed point circular polarization microstip patch antenna can not meet the requirements of the bandwidth,antenna phase center and the suppression of multipath parameters,this papper designs a four feed point and double layer patch antenna and its feed circuit.By optimizing the antenna reflector size,the ability of the antenna to suppress multipath is improved,which can be use to work in complex electromagnetic environment.Secondly,the simulation and calculation method of antenna phase center is studied.Taking the antenna design in the first step as the model,the performance of the antenna phase center is optimized,and the phase center of the antenna is achieved by optimizing the parameters of the antenna.HFSS simulation results shows that the antenna in the scope of the operating band,the phase center stability is less than 1mm,VSWR less than 2,other performance indicators can also meet the requirements.The third step is to put forward feed circuit design,considering the subsequent to the actual installation and cost factors,this thesis intends to take is simple and easy to realize the Wilkinson power divider network to realize the power and energy distribution,using microstrip phase shifter to complete the feed point of the phase shift.On the basis of theoretical caluation,the design and simulation of the power divider and phase shifter are gradually completed,and the design of the whole feeding network is finished.The simulation results show that the reflection coefficient is less than 15 dB,and the amplitude and phase of the feed point can achieve a better index in the whole operating frequency band.Fourth,the optimization of the microstrip patch antenna and the feed circuit is integrated,and the whole model is given.And the actual structure of the reflector,antenna cover,support structure and other factors simulation analysis,the results of the simulation on the final antenna processing put forward reasonable suggestions.Finally,the precision test is done in the field,outdoor relative calibration method shall be ultra short baseline onlkine,in order to as possible to eliminate the error of satellite orbit,the influence of atmospherc refraction error and multipath effect factors will test results and the simulation coincide.