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REPUBLIC OF SERBIA MINISTRY OF DEFENCE
MINISTRY OF DEFENCE Material Resources Sector Defensive Technologies Department
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An implementation of the correlative interferometer direction finding algorithm on multi-core DSP platform
VELIMIR VUJANOVIć RT-RK Institute for Computer Based Systems Novi Sad, velimir.vujanovic@rt-rk.com ALEKSANDRA DAVIDOVIĆ RT-RK Institute for Computer Based Systems Novi Sad, aleksandra.davidovic@rt-rk.com ALEKSANDAR TUCAKOV RT-RK Institute for Computer Based Systems Novi Sad, aleksandar.tucakov@rt-rk.com
Abstract: Developing a complex system like radio direction finder (RDF) puts many challenges in front of system designers. Most of challenges are related to real time nature of the system and need to preserve signal coherency. This paper will present one of many challenges we have faced with, during development of the processing block of a direction finding (DF) system. The processing module is based on commercially available multi-core DSP and it is implemented as a standard PCIe card. Processing block in designed system is a bridge between data acquisition module, and data presentation and post processing modules. Although several different DF algorithms are implemented on DSP, this paper is devoted to problems and solutions applied in implementation of a correlative interferometer algorithm, emphasizing the process of achieving acceptable results concerning real time requirements of the RDF system. Fragments of selected spectrum are processed on DSP cores in parallel to reach acceptable real time requirements. The implemented DF algorithm works with large amount of data that is pre-calculated and stored into RAM. Hence, a memory throughput and RAM capacity limitation are taken into account. Keywords: direction finding, correlative interferometer, DSP, multi-core, implementation.
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