Patent application number | Description | Published |
20090158846 | Measurement by gyroscopic system - A gyroscopic system is disclosed comprising at least a vibrating gyroscope, a first means of angle measurement, designed to provide a first measurement of angle values according to a measurement axis; and—a second means of angle measurement, designed to provide a second measurement of angle values according to said measurement axis. First angle values through the first angle measurement means vibrating in a current vibration position and second angle values through the second angle measurement means are provided simultaneously; and from these second angle values corrected on the basis of a comparison of the first and second angle values are deduced. Then the vibration position of the first angle measurement means is changed from the current position to another vibration position. First angle values through the first angle measurement means and second angle values through the second angle measurement means are then provided simultaneously; and from these first angle values corrected on the basis of a comparison of the first and second angle values are deduced. | 06-25-2009 |
20100095771 | Gyroscopic Measurement by a Vibratory Gyroscope - A gyroscopic system supplies measurements on the basis of a vibratory gyroscope, which vibrates in a first vibration position and supplies a measurement signal. A periodic command signal is applied to it over a time period to cause the vibration geometrical position to turn a first way during one part of the time period, causing a change in accordance with a first speed profile from the first position to a second position; and to cause the vibration geometrical position to turn a second way opposite the first way during the other part of the time period, causing a change in accordance with a second speed profile from the second position to the first position. The speed profiles indicate a speed variation of the change of position. The measurements supplied by the system are then based on a corrected signal obtained by subtracting the command signal from the measurement signal supplied by the gyroscope. | 04-22-2010 |
20120203456 | METHOD AND DEVICE FOR LONG-DURATION NAVIGATION - A long-term navigation method using an inertial unit associated with a system of axes X, Y, Z and mounted on a vehicle traveling relative to the Earth in order to measure its movements relative to an inertial frame of reference having axes Xi, Yi, and Zi. The method includes the steps of acting in permanent manner to measure an orientation of the system of axes X, Y, Z in the inertial frame of reference and applying a predetermined sequence of turnovers to the inertial unit in the inertial frame of reference about first and second axes that are substantially perpendicular to each other and in such a manner that at the end of the sequence the inertial unit is in a final orientation identical to its initial orientation relative to the inertial frame of reference, with the turnovers canceling within the sequence. | 08-09-2012 |
20130031948 | GYROSCOPIC MEASUREMENT IN A NAVIGATION SYSTEM - A gyroscopic system provides measurements on the basis of a vibrating gyroscope and provides a measurement signal. A periodic control signal is applied to it; in order to rotate the position of vibration, during a half period, according to a first speed profile, from a first up to a second position; and in order to rotate the position of vibration in an opposite direction during the other part of the period, according to a second speed profile, up to a third position. The measurements are based on corrected signals, each of said corrected signals, respectively for each of the vibrating gyroscopes, being obtained by; deducting the control signal from the measurement signal of the vibrating gyroscope; and taking account of errors identified on the basis of a comparison, of the measurements provided by the gyroscopic system as a function of the position of vibration with reference measurements. | 02-07-2013 |
20130031978 | GYROSCOPIC MEASUREMENT BY A GYROSCOPE VIBRATING IN PRECESSION - Gyroscopic measurements are provided, by a system comprising a vibrating gyroscope, in the form of an output signal. The vibrating gyroscope provides an original measurement signal. A periodic control signal (CP) is applied to it over a time period, which signal is suitable: for rotating the geometric position of vibration in a first direction, during a part of the time period; and for rotating the geometric position of vibration in a second direction opposite to the first direction, during the other part of the time period; said control signal having a zero mean over said time period and exhibiting portions of signal at high frequency relative to the output signal; said output signal being based on a corrected signal emanating from the original measurement signal; in which the corrected signal is based on an identification of errors made during the signal portions at high frequency. | 02-07-2013 |
20130312518 | INERTIAL UNIT HAVING VIBRATING GYROS MOUNTED ON A CAROUSEL, AND AN ANGLE-MEASUREMENT METHOD - An inertial unit comprising an inertial core ( | 11-28-2013 |