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VITA 49 Radio DF : Using coherent digital receiver set with VC++ and OctavePerup, Daniel January 2013 (has links)
The objective of this thesis was to evaluate radio receivers that had been previously acquired for other tasks by the Swedish Defence Materiel Administration, for additional service in a radio direction finding (DF) system. The antenna, calibration signal generator and DF algorithm were provided. As the receivers used the VITA 49 frame format, much of the work involved the interpretation of the frame structure and contents. The other main challenges were to put the receivers into the correct internal state, to compensate the analogue phase errors due to cabling, and to correlate the digital frames according to the time stamps. The work was performed partly as a literature study and, during implementation, by using an investigative trial and-error method. Collection of reference signals, for later offline analysis, was made at the Swedish Defence Research Agency. The findings of the evaluation was that the receivers were phase coherent and that the VITA 49 frame format was suitable for DF use. An apparently systematic error of unknown origin rendered the DF results inaccurate, even though the precision of the results was high. The automatic gain control (AGC) of the receivers did not perform according to norm. If the systematic error is compensated for, and the AGC problem is eliminated, the receivers will function as a DF system using the manufacturer's instructions, with the provided antenna. The performance of the receivers in this setting was not a primary concern for the thesis, but was deemed to be acceptable. Suggestions for further development include finding the source of the systematic error, an automatic calibration function, a more thorough performance analysis, and code optimizations using multiple threads.
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REDHAWK for VITA 49 Development in Open Radio Access NetworksTheodore Phillip Banaszak (9720671) 16 December 2020 (has links)
This thesis establishes the need for a standardized, interoperable, front end interface to support
the development of open RAN technologies, and establishes the viability and desirability of the
VITA 49 interface standard as the alternative to other interface technologies. The purpose of this
work is to propose a testbed platform for the further development for VITA 49 as a standard frontend interface as other current testbeds are not designed not as well suited to the VITA 49 standard
or open RAN architecture. The VITA 49 interface standard provides a packetized interface
between the front-end and the digital back-end of a split architecture system in a way that enables
hardware interoperability between and within vendor supplies. The VITA 49 Radio Transport
standard is ideally appropriate for integration into SDRs [12] due to its flexibility and metadata
support. The REDHAWK platform is an integrated development environment which is used to
develop a radio system that utilizes a remote radio unit to send and receive signals which transmits
it using the VITA 49 protocol to the base band unit for processing. It was found that REDHAWK
is better than GNURadio for this purpose, and that VRT technology is a much better than the
current CPRI Standard as it provides an open standard, that enables a flexible, scalable interface
that enables long-term growth.
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