Research On Antenna Technique For High Accuracy Navigation Receiver

High accuracy satellite navigation receivers are widely used in the ground monitoring stations of the satellite navigation systems,which is pivotal measuring equipment for time synchronization between satellite and ground receivers,satellite precision orbit determination.In high accuracy navigation receiver,the measurement error will be introduced by antenna because of the non-ideal characteristics.This is a main error source which can not be equivalent to the system delay.Therefore,it is necessary to research the receiver antenna for high accuracy satellite navigation.This dissertation takes the monitoring receivers of satellite navigation systems as the application background,the measurement error estimation and correction introduced by antenna,phase errors for GNSS antenna in multipath environment,the high precision multi-frequency choke antenna and phase center evaluation for the high precision adaptive antenna are researched.The major contributions of this dissertation are listed as follows:(1)In order to solve the problem that the measurement error introduced by the non-ideal of the receiver antenna is not equal to the system delay,the theoretical calculation formula of the carrier phase bias introduced by the antenna and the relation between the antenna parameters and the receiver bias are deduced.An antenna phase center evaluation method is proposed based on the cut-off angle.The method eliminates the influence of phase rotation.Theoretical and numerical simulation results show that the maximum carrier phase deviation is reduced by increasing the cut-off angle.(2)The phase center performance of adaptive antenna can not be evaluated by the traditional fixed beam estimation method.In this paper,a phase center stability estimation method for adaptive antenna array is proposed based on the definition of available beam ratio.Based on this method,the influence of the element characteristics on the phase center of the synthesized array is evaluated firstly.Finally,the phase center characteristics in different formation and anti-jamming algorithms are analyzed.Theoretical and numerical simulation results show that the carrier phase stability is between 0 and 60 mm for different types of quaternary arrays with different anti-jamming algorithms.In contrast,the homogeneous circular array maintains the optimal phase center performance under the different anti-jamming algorithms.Compared to the different anti-jamming algorithms,the deterministic beamforming algorithm(DBF)keeps the most excellent phase center performance.(3)In farfiled,the phase center characteristic of antenna is different from that of darkroom because of the existence of multi-path signal;the credibility of phase center calibration result is restricted.In this paper,in order to solve the problem,the relationship between the up-to-down(U/D)ratio of the antenna and the phase deviation introduced by the antenna is deduced based on the ratio of forward right-hand circular polarization(RHCP)gain to the backward circular polarization gain.The function between the antenna receiver cut-off angle and the carrier phase deviation introduced by the antenna is established.(4)GNSS compatible work can provide more excellent positioning performance for users,while the receiver antenna technology which can be compatible with multi-band has not breakthrough.In this paper,we propose a triple-band stacked circular-polarized patch antenna by adopting the shorted annular ring configuration and the mult-band choke ring.Simulation and experimental results show that the antenna gain is higher than 5dBic in the whole frequency band,the front-to-back ratio of the antenna is above 20 dB,the phase center stability of the antenna is in the mm level,which is suitable for high-precision GNSS applications.Finally,the research results of this paper and the application of the project are summarized and prospected.The results of this paper have been applied in the research of satellite navigation system monitoring station receiver.The technique studied in this dissertation can be applied in the monitoring receivers of satellite navigation systems,the reference receivers of satellite navigation augmentation systems and the others receivers for high-precision users.