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This paper presents a super resolution Direction of Arrival (DOA) estimation system based on a combined hardware-software implementation for radio frequency signals. After computational simulation of the chosen method, the system is designed and implemented using two multichannel wideband microwave transceivers controlled by a FPGA board connected to a host computer with a PCI Express adapter. A graphic interface is developed to visualize the spatial spectrum and validate the right system performance. The followed procedure shows up the main issues and requirements when this kind of method is implemented. Moreover, a generic modular and flexible hardware solution is proposed where no custom printed circuit board design and fabrication is needed. [ABSTRACT FROM AUTHOR]

The tracking of radiofrequency signals emission source that use directive antennas constitutes a trend in the modern telecommunication systems. The present investigation is based in the application of digital signal processing techniques in FPGA to estimate the angular position of the signal emission source using monopulse. The paper shows design and implementation of processing blocks to determinate source direction from sum and difference resulting channels of the antenna. The system is done by multidomain simulation platform Simulink and exported to hardware description language for implementation in FPGA (Field Programmable Gate Array). In the obtaining of error curve are used polynomial approximation models. The developed system is verified through eight elements antennas array with digital beamforming. [ABSTRACT FROM AUTHOR]

This paper shows the obtaining process of a digital beamformer of multiple simultaneous directional patterns for signals reception using the ARRadio evaluation board. The board is based on the integrated transceiver AD9361 and guarantees the reception, digitization and seending to an FPGA (Field Programmable Gate Array) of the received radio waves by each radiofrequency channel. The FPGA is located on the TR4 Development Board. Communication between FPGA and ARRadio is realized through a high speed connector. On the programmable device are performed AD9361's configuration and control, multichannel calibration process based on Fourier Transform (as method of measuring the delay between channels) and beamforming of multiple simultaneous directional patterns digitally. Simulink is used as design tool for digital system develop. Finally is realized the implementation and experimental verification of multiple digital beamforming system. [ABSTRACT FROM AUTHOR]