论文部分内容阅读
陀螺仪的逐日或逐次起动漂移一般要比随机漂移大许多倍,甚至达一个数量级。因此,如果在初始对准期间能把陀螺的逐日或逐次起动漂移自动地进行测定和补偿,就相当于把惯导系统的精度提高很多倍。本文对“惯性导航系统锁定方位环小转角初始对准法”的某些问题作了进一步的研究和讨论。所得的主要结论是:小转角锁定方位环对准法可以在较短的对准时间内测定和补偿平台三个轴的陀螺漂移。所引入的纬度误差对方位陀螺漂移测定精度的影响随纬度以余弦关系变化;而标定系数误差的影响,则随纬度以正弦关系变化。在有条件时,应当尽可能采取(2K+1)π/4的初始对准方位,用以提高方位角的对准精度。
The daily or successive start-up drifts of the gyroscope are generally many times larger than the random drift, even by an order of magnitude. Therefore, if the daily or successive start-up drifts of the gyro are automatically measured and compensated during the initial alignment, the accuracy of the inertial navigation system is equivalent to a multiple of many times. This paper makes some further research and discussion on some problems of “Initial Alignment Method for Locking Small Rotation Angle of Inertial Navigation System”. The main conclusions obtained are: The small-angle locking azimuth ring alignment method can measure and compensate the gyroscopic drift of the three axes of the platform in a shorter alignment time. The influence of the introduced latitude error on the measurement accuracy of the azimuth gyroscope changes with the latitude of the cosine; and the influence of the calibration coefficient error changes with the sine of the latitude. When possible, the initial alignment of (2K + 1) π / 4 should be taken as much as possible to improve the alignment accuracy of azimuth.