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Suitability of a Commercial Software Defined Radio System for Passive Coherent Location

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Suitability of a Commercial Software Defined Radio System for Passive Coherent Location Suitability of a Commercial Software Defined Radio System for Passive Coherent Location Aadil Volkwin A dissertation submitted to the Department of Electrical Engineering, University of Cape Town, in fulfilment of the requirements for the degree of Master of Science in Engineering. Cape Town, May 2008 Dedicated to: My Parents, my Sister and my Wife. 2 Declaration I declare that this work done is my own, unaided work. This dissertation is being submitted to the Department of Electrical Engineering, University of Cape Town, in fulfilment of the requirements for the degree of Master of Science in Engineering. It has not been submitted for any degree or examination in any other university. ................................................................................ Signature of Author Cape Town 2008 3 Abstract This dissertation provides a comprehensive discussion around bistatic radar with specific reference to PCL, highlighting existing literature and work, examining the various performance metrics. In particular the performance of commercial FM radio broadcasts as the radar waveform is examined by implementation of the ambiguity function. The FM signals show desirable characteristics in the context of our application, the average range resolution obtained is 5.98km, with range and doppler peak sidelobe levels measured at -25.98dB and -33.14dB respectively. Furthermore, the SDR paradigm and technology is examined, with discussion around the design considerations. The USRP, the TVRx daughterboard and GNURadio are examined further as a potential receiver and development environment, in this light. The system meets the low cost ambitions costing just over US$1000.00 for the USRP motherboard and a single daughterboard. Furthermore it performs well, displaying desirable characteristics, The receiver's frontend provides a bandwidth of 6MHz and a tunable range between 50MHz and 800MHz, with a tuning step size as low as 31.25kHz. The noise characterisation of the receiver reveals a NF of 10dB, a sensitivity of -105dB and a dynamic range of 62dB. Finally, the investigation into the stability of the daughterboard frontend oscillators due to ageing effects is shown to be steady with acceptable levels of variation, showing a fractional frequency variation from 2.3 to 0.8 parts per 10 million and a maximum frequency drift of 4Hz. 4 Acknowledgements All praises and thanks to the almighty for all the blessings and abilities that have been afforded to me. Further gratitude is expressed to: My supervisor, Prof. M.R. Inggs for his advice, support and encouragement. Dr. Yoann Paichard, for invaluable technical advice in developing and interpreting various aspects of the research. To the RRSG, in particular Regine Lord for administrative support, Lance Williams, Jonathan Ward and Gunther Lange for various hardware assistance. To members of the GNURadio mailing list, in particular Matt Ettus and Firas Abbas. Finally, to my family and friends for their encouragement, support and patience . 5 Contents Declaration.......................................................................................................................................3 Abstract............................................................................................................................................4 Acknowledgements..........................................................................................................................5 Contents........................................................................................................................................... 6 List of Figures..................................................................................................................................8 List of Tables................................................................................................................................. 10 Nomenclature.................................................................................................................................11 Chapter 1........................................................................................................................................13 Introduction................................................................................................................................... 13 1.1 Background........................................................................................................................ 13 1.2 Plan of Development..........................................................................................................14 Chapter 2........................................................................................................................................20 Passive Coherent Location............................................................................................................ 20 2.1 System level description of PCL........................................................................................20 2.2 Advantages and Disadvantages of PCL Systems...............................................................25 2.3 History and Examples of PCL Systems............................................................................. 26 2.4 Applications of PCL.......................................................................................................... 28 2.5 Typical Illuminators...........................................................................................................28 2.6 Relevant Equations .......................................................................................................... 30 2.7 Summary ........................................................................................................................... 40 Chapter 3........................................................................................................................................41 USRP and GNURadio................................................................................................................... 41 3.1 Introduction ......................................................................................................................41 3.2 Software Defined Radio ....................................................................................................41 3.3 Anatomy of a SDR Receiver..............................................................................................43 3.4 Universal Software Radio Peripheral.................................................................................44 3.5 GNURadio......................................................................................................................... 52 3.6 Summary............................................................................................................................ 55 Chapter 4........................................................................................................................................57 Receiver Characterisation..............................................................................................................57 4.1 Introduction ......................................................................................................................57 4.2 Test System Overview ...................................................................................................... 57 4.3 Receiver Bandwidth...........................................................................................................58 4.4 Gain Range and Control.....................................................................................................59 4.5 Multiplexer Usage and Data Interleaving.......................................................................... 61 4.6 Frequency Range and Control........................................................................................... 62 4.7 Spurious Artifact ...............................................................................................................63 4.8 Receiver Noise Figure .......................................................................................................64 4.9 Sensitivity.......................................................................................................................... 66 4.10 Dynamic Range, Minimum Detectable Signal and Gain Compression...........................67 4.11 Summary.......................................................................................................................... 71 6 Chapter 5........................................................................................................................................73 Ambiguity Plot Analysis............................................................................................................... 73 5.1 Introduction ......................................................................................................................73 5.2 System Overview............................................................................................................... 73 5.3 Algorithm Concept.............................................................................................................75 5.4 Results................................................................................................................................76 5.5 Summary............................................................................................................................ 82 Chapter 6........................................................................................................................................84
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