Software-defined instrumentation for microwave network analysis measurement system incorporating virtual calibration technique
Network analysis field has existed for decades, but the most commercial analyzers were larger stand-alone benchtop instruments, expensive for individual investment, low volume of production, complex collections of multiple extra components, cables and support instruments. Today, the vector networ...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/84215/1/FK%202019%2089%20%20-%20IR.pdf |
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| Summary: | Network analysis field has existed for decades, but the most commercial
analyzers were larger stand-alone benchtop instruments, expensive for
individual investment, low volume of production, complex collections of multiple
extra components, cables and support instruments. Today, the vector network
analyzer (VNA) still considers a huge investment for education, small-medium
industries, and researcher lab.
In this thesis, we make measurement evolution, delivering promising low-cost
VNA measurement system based reconfigurable Software Defined Radio
(SDR) platform. The main contribution of this research is the design of a lowcost
reconfigurable VNA based on SDR platform using minimal components
and utilize open source signal processing framework, GNU Radio software.
The traditional method utilizing the GNU Radio relies on its GUI Sink module
only were unable to extract baseband complex data immediately. A new
methodology to perform data acquisition from the GNU Radio Software is
developed in order to establish signal characteristic from SDRs.
This work was motivated by the possibility to realize a low cost and fast
development cycle time implementation of VNA using SDR integrate with the
test set components to define new terminology known as VNA of Software
Defined Instrumentation (VNA-SDI). This VNA-SDI platform operates in the 70
MHz to 6 GHz range, and support channel bandwidths from 200 kHz to 56
MHz. The commercial mechanical calibration standard used to validate oneport
calibration process applied on VNA-SDI. This proposes a measurement
system is to replace the commercial VNA with a low-cost portable unit that can
characterize, generate, transmit and receive signals, across a wideband with
good repeatability and stability. The performance of the measurement system is verified by showing that the
Scattering parameters (S-parameters) of the one-port antenna as devices
under test have closed an agreement to results from a commercial VNA within
+/-10 dB offset.
The second contribution is introduced a method one-port self-calibration or
known virtual calibration, which uses impedance emulation block to provided
characteristic of OPEN, SHORT, and LOAD during performing calibration. This
impedance emulation block was implemented on GNU Radio block to
manipulate magnitude factor, phase offset and, phase delay. In consideration
of the application, the proposed approach reduces the mechanical complexity
of the calibration procedure significantly, by eliminating external calibration.
This enables simplified automation of the measurement setup, thus to make
VNA-SDI calibration faster, simpler, and easier than traditional mechanical
calibration. |
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