Research On Navigation Interference Signal Mitigation Methods Based On The Reference Antenna In Radio Astronomy

With the significant increase in the spatial resolution and sensitivity of the Radio telescope and the expansion of the wireless business applications,the radio astronomical observation increasingly sensitive to the radio frequency interference,especially the influence of the navigation signal.And the huge data transfer rate of Modern radio telescope makes the interference mitigation of observation data processing more and more difficult.In order to be able to make the fullest use of these large radio instruments,interference mitigation of radio astronomy observation has become a major obstacles and problems to be solved of new generation telescopes.This paper revolves the interference mitigation problem using the navigation signal characteristics around the topic background of the pulsar radio astronomical observation affected by the navigation signal,based on array radio telescope antenna plus reference antenna structure.This paper firstly established the signal models on the basis of the pulsar signal,the navigation signal and noise signal characteristics in the array receiving system,and starting from the radio data applications,build interference mitigation evaluation criterions in the design of interference mitigation method.Secondly analyzes the application of the traditional subspace projection method and cross subspace projection method in radio astronomy interference mitigation.Then presents an interference mitigation method based on the iterative subspace projection to overcome the problem of multiple interferences imping on the single reference antenna,and presents a polynomial based interference mitigation method for moving interference.Finally,for effective collection the data of experiment,we designed and implemented a high-speed synchronous data acquisition recording system,and have carried on the rational analysis of the performance test,which laid a solid foundation for the actual radio astronomy interference mitigation work.