Before the inertial instrument unit (IMU) is equipped on the carrier, its dynamic performance needs to be measured with a dynamic test equipment (DTE), such as vibration table, turntable and.so on. It is very difficult to separate the internal error of the DTE from the IMU navigation error. Traditional attitude measurement methods cannot simultaneously meet the measurement requirements of non-contact, high precision, large bandwidth, high speed and high sensitivity. Therefore, there is an urgent need for a third-party attitude performance measurement and evaluation system to realize the calibration of IMU dynamic performance and equipment error, which is of great significance for improving IMU dynamic performance and reducing test equipment error. Attitude measurement refers to the measurement of the rotation angle of a space object around three orthogonal axes. In order to achieve non-contact, high-precision, large-bandwidth, high-speed and high-sensitivity dynamic attitude measurement, this paper proposes a three-dimensional dynamic non-contact attitude detection demonstration based on Doppler laser vibrometer (DLV), expounds the principle of the vertical deflection of the pentaprism, establishes a mathematical model of the optical path deflection error of the pentaprism that affects the measurement accuracy, analyzes the key factors that affect the measurement accuracy and builds an experimental system to verify the measurement plan. When the measurement angle is not less than ±10°, the three-axis angle measurement accuracy is less than 0.01°.
In this paper, a novel optical method is proposed to effectively double the sensitivity of FOGs. Two fiber polarization combiner/splitters (PCS) are added in the traditional FOG optical path, which are able to either combine two orthogonal polarizations transmitting at two different PM fibers into the two orthogonal axes of one PM fiber respectively or split two polarizations transmitting at the two orthogonal axes of one PM fiber into two polarizations to transmit at two different PM fibers respectively. Through the specific placement and coupling of these two fiber polarization combiner/splitters, the incident light can transmit twice along the light path of FOG. The experimental setup is established and the method is verified experimentally. The results show that the proposed method will effectively improve the sensitivity and the signal-to-noise ratio (SNR) of FOG without increasing the length of fiber coil, which is very benefit to improve the technology of FOGs, as well as the miniaturization of FOGs.
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