Design of direction finding system of rotating multi-baseline phase interferometer based on GPU and DDS

In this paper, the phase interferometer high precision direction finding system is designed and researched for the urgent demand of single station passive positioning system for the phase interferometer high precision direction finding. The main feature of this system is: the integration of antenna array, RF front end, data processing (phase extraction, defuzzing, fitting, error analysis) based on heterogeneous CPU and GPU, effective transmission of data packets based on DDS and the interface display. Experiments show that the system can effectively realize the high precision direction finding and the whole process analysis of the trajectory of the target. In addition, the system uses GPU to realize the high speed phase extraction of angle data, adopts DDS to realize the efficient transmission of data and greatly simplify the complicated process such as protocol construction during the transmission process, which has remarkable innovation.