フーリエ変換を用いた搬送波の狭帯域位相追尾ソフトウエア

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  • Software for Tracking Phases of a Carrier Wave with Very Narrow Bandwidth by Fourier Transforms
  • フーリエ ヘンカン オ モチイタ ハンソウハ ノ キョウタイイキ イソウ ツイビ ソフトウエア

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<p>A Doppler frequency has been used to track a spacecraft and to know the orbit. FFT （Fast Fourier Transforms） gives a mean spectrum for a period of Fourier transforms so that it is a useful tool to estimate a Doppler frequency from a received signal. Phase variations of the signal in the period would be derived if we need to know the frequency variation of the signal in the period. FFT enables us to estimate phase variations of the signal in the period, when the signal is frequency-converted by software. The software for phase estimation of S- and X-band carrier signals with very narrow bandwidth （e.g. several ten Hz） has been developed, using time series data sampled at two hundred ksps （kilo-sample per second） after frequency conversions by hardware. This software can be applied to detect the lunar ionosphere with very small TEC variations by tracking phases of two frequency signals from a lunar orbiter. It can be widely used to measure phases of a carrier signal from a satellite, for example, GNSS or others with high accuracy.</p>

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