PROBLEM TO BE SOLVED: To provide a correction method for a frequency reception signal capable of obtaining a frequency reception signal, even in the case where a sampling period of Fourier transformation of a reception signal and a period of a vehicle noise signal are not synchronized, equal to a frequency reception signal in the case where the periods are synchronized.SOLUTION: The present invention relates to a correction method for a frequency reception signal Frf obtained by performing Fourier transformation on a digital reception signal Drf that is obtained by using an antenna 20 provided in a vehicle 10, in a sampling period. The correction method includes: generating a correlation matrix R by using a frequency reception signal Frf on which Fourier transformation has been performed in the previous sampling timing and a frequency reception signal Frf on which Fourier transformation is newly performed in present sampling timing; using the correlation matrix R to estimate a phase rotation amount Wcaused by deviation of a phase in the sampling period of Fourier transformation relative to a period of a vehicle noise signal received by the antenna 20 and generated periodically; and using the phase rotation amount Wto correct the frequency reception signal Frf on which Fourier transformation has been performed.SELECTED DRAWING: Figure 2
【課題】受信信号のフーリエ変換のサンプリング周期と車両ノイズ信号の周期とが同期していない場合であっても、同期したのと同等の周波数受信信号を得ることができる周波数受信信号の補正方法を提供する。【解決手段】車両10に設けられたアンテナ20を用いて得られたデジタル受信信号Drfをサンプリング周期でフーリエ変換して得られた周波数受信信号Frfの補正方法であって、前回のサンプリングタイミングでフーリエ変換された周波数受信信号Frfと今回のサンプリングタイミングで新たにフーリエ変換された周波数受信信号Frfとを用いて相関行列Rを生成し、相関行列Rを用いてアンテナ20で受信された周期的に発生する車両ノイズ信号の周期に対するフーリエ変換のサンプリング周期の位相のずれに起因する位相回転量WLkを推定し、位相回転量WLkを用いて、フーリエ変換された周波数受信信号Frfを補正する。【選択図】図2
CORRECTION METHOD FOR FREQUENCY RECEPTION SIGNAL, CORRECTION DEVICE FOR FREQUENCY RECEPTION SIGNAL, VEHICULAR NOISE CANCELLING METHOD AND VEHICULAR NOISE CANCELLING DEVICE
周波数受信信号の補正方法、周波数受信信号の補正装置、車両用ノイズキャンセリング方法、及び、車両用ノイズキャンセリング装置
2017-03-02
Patent
Electronic Resource
Japanese
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