Abstract: The bias error in a fiber optic system comprising a fiber optic gyroscope can be determined by determining of at least two different values for rotation rate by an evaluation unit of the fiber optic gyroscope for almost constant rotation rate applied to the fiber optic gyroscope and/or can be reduced by a linear combination of the at least two different values for the rotation rate. A fiber optic system that is suitable for carrying out this method comprises besides the fiber optic gyroscope a control device that is configured to control at least one element of the fiber optic gyroscope such that at least two different values for the rotation rate are determined by the evaluation unit of the fiber optic gyroscope for almost constant rotation rate applied to the fiber optic gyroscope.

Abstract: The bias error in a fiber optic system comprising a fiber optic gyroscope can be determined by determining of at least two different values for rotation rate by an evaluation unit of the fiber optic gyroscope for almost constant rotation rate applied to the fiber optic gyroscope and/or can be reduced by a linear combination of the at least two different values for the rotation rate. A fiber optic system that is suitable for carrying out this method comprises besides the fiber optic gyroscope a control device that is configured to control at least one element of the fiber optic gyroscope such that at least two different values for the rotation rate are determined by the evaluation unit of the fiber optic gyroscope for almost constant rotation rate applied to the fiber optic gyroscope.

Abstract: A controller unit includes a PI-controller for harmonic command variables. The transfer function of the PI-controller has a conjugate complex pole at a controller angular frequency ?r in the s-plane or a pole at e±j?rT in the z-plane, wherein T is the sampling time of a discrete input signal of the PI-controller and ?r is larger than 0. The controller angular frequency ?r is chosen equal to the resonance angular frequency ?0 of an oscillator. The controller parameters, are, for example determined by pole/zero compensation. The controller unit allows, for example, a broad band control of harmonic oscillators in rotation rate sensors.

Abstract: A controller unit includes a PI-controller for harmonic command variables. The transfer function of the PI-controller has a conjugate complex pole at a controller angular frequency ?r in the s-plane or a pole at e±j?rT in the z-plane, wherein T is the sampling time of a discrete input signal of the PI-controller and ?r is larger than 0. The controller angular frequency ?r is chosen equal to the resonance angular frequency ?0 of an oscillator. The controller parameters, are, for example determined by pole/zero compensation. The controller unit allows, for example, a broad band control of harmonic oscillators in rotation rate sensors.

Abstract: A device for current measurement based on a fiber-optic in-line Sagnac interferometer includes a birefringence phase modulator for non-reciprocal phase modulation of two orthogonal polarization modes of a light beam passing through the interferometer. The phase modulator is a digital phase modulator that is directly digitally drivable to permit simplification of the corresponding signal processing or driving electronics unit.

Abstract: A device for current measurement based on a fiber-optic in-line Sagnac interferometer includes a birefringence phase modulator for non-reciprocal phase modulation of two orthogonal polarization modes of a light beam passing through the interferometer. The phase modulator is a digital phase modulator that is directly digitally drivable to permit simplification of the corresponding signal processing or driving electronics unit.

Abstract: For the drive excitation, the method for the capacitive drive excitation of oscillators in sensors for the capacitive measurement of force, acceleration and, in particular, rotation rates according to the Coriolis principle, provides according to the invention for the use of high-frequency constant-amplitude pulse packets with no DC component, the width or phase angle of which can be adjusted in order to keep the oscillator speed constant, for the purpose of resetting or correcting tolerances.

Abstract: A synchronous serial bus with timing information implemented in the bus standard protocol is provided for a bi-directional serial multi-channel data interchange between locally dedicated measuring instruments in a distributed configuration and/or with a data processing unit. This provides synchronized interchange of data between the instruments wherein each instrument is provided with an allocated controller. The invention permits one to employ a simple, preferably standardized, bus protocol. Wiring structure is considerably simplified for a complex multi-sensor system.

Abstract: A digitized real voice signal is converted via complex filtering into a complex signal that is subjected to sampling rate reduction, the bandwidth of the respective complex filter corresponding to the sampling rate. The complex signal is phase-modulated by means of a code signal generated by a random-number generator and additively combined with a pilot signal (likewise phase-modulated in a random distribution) to form an encrypted useful signal for transmission. The useful signal is sequentially transmitted together with a preamble for synchronization and signal equalization at the receiver end. At the receiver end, clock synchronization is forced for a phase-modulated pilot signal produced at the receiver end and equalizer coefficients for an equalizer at the receiver end are calculated from the digitized received signal after complex filtering and corresponding sampling rate reduction, during a preamble recognition phase, at which point the phase of the useful signal decryption is initialized.

Abstract: A method and apparatus for stabilizing the scale factor and the loop gain of the control loop of a fiberoptic Saganc interferometer with phase resetting. A digital evaluation circuit includes two auxiliary control loops, one for nominal gain of the scale factor control and the other for stabilization of loop gain of the primary control loop, in addition to the control loop for the readjustment of the phase modulator. The evaluation circuit can be realized as an integrated circuit. In addition to the optimization of control bandwidth, the circuit avoids substantial complexity of the circuit subassemblies for generating modulation and demodulation signals and control signals for the scale factor control loop.

Abstract: A method for achieving an initial synchronization and matching a receive filter of a digital receiver of a binary baseband transmission system by employing a training sequence before the transmission of useful data. The coefficients of the digital filter that is to be matched to the received signal are obtained by means of the training sequence. Character synchronization and recognition of the end of the sequence occur automatically. After the training sequence is received, an optimally matched receive filter in the receiver is made available. The method is independent of the level of the received signal within a predetermined computing accuracy and can be implemented by means of a conventional signal processor system.

Abstract: An open loop fiber optic rotation rate sensor of the type that is subject to bias errors arising from the coupling of disturbing signals into the input of a demodulator. Such errors are suppressed by the use of a demodulation signal that is statistically independent of all signal sources that may cause disturbing signals. A modulation signal generator includes a random number generator from which two signals (b.sub.0, b.sub.1) for a statistically alternating bias for activating optimal working points on the interferometer characteristic with positive or negative gradient and an appropriately matched demodulation signal (d) are derived. The demodulation signal, after transit time correction, acts upon the synchronous input of the synchronous demodulator.

Abstract: A fiber optic interferrometer rotation rate sensor is reset by phase ramp via a digital control circuit using as demodulation signal within the control circuit a signal (d) that is statistically independent of all parasitic signals and originates from a modulation signal generator that includes a random number generator. A reversal of the phase modulator signal is provided in a statistically distributed manner to integral values of .pi./2 of the interferometer characteristic. The arrangement avoids deadband and removes scale factor nonlinearities, particularly at low rates of rotation.