G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 21/00 (2006.01) G01H 3/08 (2006.01) G01J 3/28 (2006.01) G01R 23/16 (2006.01)
Patent
CA 2653572
A fundamental wave beat component frequency detecting method includes steps of obtaining the frequency fb[i] of plural peak signals which appear in a band 1/2 of a frequency fs from a spectrum obtained from measuring target signals sampled with the sampling frequency fs in order to detect the repetition frequency (fundamental wave component) of the measuring target signal having plural harmonic components having a similar power, assuming that each of the plural peak signals is a beat component (fundamental wave beat component) originating from the fundamental wave of the measuring target signal before and after the sampling frequency is changed so as to successively calculate each theoretical frequency fc[i,j] of the beat component (harmonic beat component) originating from the harmonic component of the measuring target signal, successively comparing the each theoretical frequency fc[i,j] with the frequency fb[i] of the plural peak signals, and determining that the peak signal which gives the theoretical frequency fc[k,j] which mostly agrees with the frequency fb[i] of the plural peak signals is a fundamental wave beat component originating from the fundamental wave of the measuring target signal.
Selon l'invention, une fréquence fb[i] d'une pluralité de signaux de pic apparaissant dans une bande d'au plus une moitié d'une certaine fréquence d'échantillonnage fs est obtenue parmi des spectres obtenus à partir d'un signal mesuré échantillonné à la fréquence fs. Chacun de la pluralité de signaux de pic est supposé être une composante de battement (composante de battement d'onde fondamentale) provoquée par l'onde fondamentale du signal mesuré avant et après la variation de la fréquence d'échantillonnage, et chaque fréquence théorique fc[i,j] d'une composante de battement (composante de battement harmonique) provoquée par la composante harmonique du signal mesuré est successivement calculée. La fréquence théorique fc[i,j] est successivement comparée à la fréquence fb[i] de la pluralité de signaux de pic. Le signal de pic qui donne la fréquence théorique fc[k,j] correspondant le plus à la fréquence fb[i] de la pluralité de signaux de pic est déterminé comme étant la composante de battement d'onde fondamentale provoquée par l'onde fondamentale du signal mesuré. Un procédé de détection de la fréquence de composante de battement d'onde fondamentale est ainsi obtenu.
Anritsu Corporation
Ridout & Maybee Llp
LandOfFree
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