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Frequency Tracking Using Digital Cavities

Zetterblom, Fredrik LU (2017) EITL01 20171
Department of Electrical and Information Technology
Abstract
Digital cavities are efficient algorithms for comb filters with very low computational costs. They have been used to precisely measure the amplitude and phase of high frequency signals (few giga samples per second) from data acquired by high speed digitizers 80 GSps. However, the previous measurements were done offline as the serial processors used in the analysis could not cope with the large data acquisition rate. In this project, we have implemented digital cavities in an FPGA architecture to measure amplitude and phase of signals in real time. Moreover, we have implemented multiple digital cavities that are tuned to slightly different frequencies, that process data in parallel. Based on the interpolation of the responses from each... (More)
Digital cavities are efficient algorithms for comb filters with very low computational costs. They have been used to precisely measure the amplitude and phase of high frequency signals (few giga samples per second) from data acquired by high speed digitizers 80 GSps. However, the previous measurements were done offline as the serial processors used in the analysis could not cope with the large data acquisition rate. In this project, we have implemented digital cavities in an FPGA architecture to measure amplitude and phase of signals in real time. Moreover, we have implemented multiple digital cavities that are tuned to slightly different frequencies, that process data in parallel. Based on the interpolation of the responses from each digital cavity, we have also developed algorithms which allows for tracking the change in frequency of the signal. These new advances are expected to be very useful in measuring the drifts in radio and microwave frequencies that are commonly used in FM broadcasting, frequency-shift keying, power systems, laser spectroscopy, synchrotrons, particle accelerators, etc. (Less)
Popular Abstract
A new method for detecting frequency shifts in digitized signals has been investigated and developed during a bachelor thesis at Lund University. A real-time version of the method has been designed and implemented on a FPGA-platform with a high-speed digitizer.
Please use this url to cite or link to this publication:
author
Zetterblom, Fredrik LU
supervisor
organization
course
EITL01 20171
year
type
M2 - Bachelor Degree
subject
keywords
Digital cavities, Frequency Tracking
report number
LU/LHT-EIT 2017-558
language
English
id
8902840
date added to LUP
2017-02-14 09:08:01
date last changed
2017-02-14 09:43:57
@misc{8902840,
  abstract     = {{Digital cavities are efficient algorithms for comb filters with very low computational costs. They have been used to precisely measure the amplitude and phase of high frequency signals (few giga samples per second) from data acquired by high speed digitizers 80 GSps. However, the previous measurements were done offline as the serial processors used in the analysis could not cope with the large data acquisition rate. In this project, we have implemented digital cavities in an FPGA architecture to measure amplitude and phase of signals in real time. Moreover, we have implemented multiple digital cavities that are tuned to slightly different frequencies, that process data in parallel. Based on the interpolation of the responses from each digital cavity, we have also developed algorithms which allows for tracking the change in frequency of the signal. These new advances are expected to be very useful in measuring the drifts in radio and microwave frequencies that are commonly used in FM broadcasting, frequency-shift keying, power systems, laser spectroscopy, synchrotrons, particle accelerators, etc.}},
  author       = {{Zetterblom, Fredrik}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Frequency Tracking Using Digital Cavities}},
  year         = {{2017}},
}