A Research On High Precision North Seeker Based On Flexible Gyroscope

Gyro north seeker is a high precision inertial system that can static in severalenvironment, calibrating the bearing of carrier automatically. It is a kind of independentposition indicating system.In engineering applications, how to meet the precision of the north seeker, northseeking time, cost, size, weight, environmental adaptability and other complexrequirements, is a test for anyone who works on this subject. It is a meaningful work toimprove the precision of the north seeker, under the condition that other parametershave been given.In order to develop the north seeker with high precision, the analysis of the factorswhich causing the error of north seeking is needed. Furthermore, the way could befound to correct the error. In addition, it should be based on the gyro data measured inthe design to optimize north seeking method, giving full play to the performance of thegyroscope, and improving the north seeking precision.Aiming at these problems, the paper do some research of north-seeking scheme,sensor model, error analysis, parameter estimation and so on.The working principle of gyro north seeker and the scheme of gyro north arediscussed. The paper introduces and analyzes several commonly schemes of gyro northseeking, including continuous rotation scheme, the four position north seeking scheme,two position north seeking scheme and the three position north seeking scheme. Thenthe paper research a optimizational scheme of north seeking based on the three positionnorth seeking scheme, the scheme is determined by static gyro drift experiments thatdoing several north seeking to eliminate the random error. It can improve the northseeking precision.The software, hardware design and structure is the key technique in developinghigh precision north seeker. The paper introduces several kinds of gyro that used ofdesigning north seeker and describe the principle of flexible gyroscope in detail. Thepaper describe the the design and implementation of north seeker prototype from theaspects of the hardware, software and the structure. And the parameter design of gyro circuit is also introduced in detail which is related to the precision of north seeking.It analyze the factors which causing the north seeking error. After such work hasbeen done the main factor which causing the error could be found that was the stabilityof gyro drift and north seeker rotation mechanism. Then we try to find the way tocorrect the error by temperature compensation and linearity compensation.The engineering prototype has been developed according to the scheme of thenorth seeking and the analysis of the error, then the paper design some tests to prove thecorrect and feasibility of the north seeking scheme.