The bias stability of gyroscope is a key factor influencing the performance of inertial navigation systems. Therefore, it is desirable that the day to day drift of gyros can automatically be measured and compensated during the time of initial alignment of an inertial measurement. However, the drift compensation for the azimuth gyro is very hard to obtain. This paper proposes an initial alignment technique for a gimaled inertial measurement system, which provides the measurement of the drifts of all three gyros, two level gyros and the azimuth gyro. The technique consists of a 'locked azimuth-gimbal' method in conjunction with a small angle two-position initialization procedure. This technique also allows a reduction of the time needed for initial alignment to around five minutes. It is believed that this technique can contribute to the development of low-cost inertial navigation systems which are capable of fast initialization.
A locked azimuth-gimbal method of INS initialization
Ein Verfahren mit festem Azimut-Kardanrahmen zur Initialisierung der Traegheitsnavigation
1985
7 Seiten, 5 Bilder, 3 Quellen
Conference paper
English