Study and Simulation of Fiber Optic Compass Alignment with External Velocity Damping

• 1、College of Automation, Harbin Engineering University
• 2、College of Automation, Harbin Engineering University

Abstract：Initial alignment of strap down inertial system is a hot topic at home and aboard recently, and its precision is closely related to the precision of navigation system. Since the error of the initial alignment is transmitted in the form of schuler cycle, the traditional compass can realize the self-alignment by adding the damping units. But the schuler condition can also be damaged, and this leads to the errors caused by external environment accelerations such as carrier moving acceleration and the sea wave acceleration added to the system, which consequently reduce navigation accuracy. In this paper, a simulation of compass alignment on the base of introducing external velocity damping is given. The outstanding advantage of introducing velocity can be obtained. The paper gives principle diagram, loop circuit design and parameter deduction. The results of an extensive simulation study indicate that the external velocity damping method can effectively eliminate ill effect of disturbing accelerations. Meanwhile, the results also indicate that the external velocity measurement precision may have constraint effect on the alignment precision, so it demands a high precision velocity sensor in practical use. However, recent velocity sensor can immediately meet the demand.

keywords： Simulation Inertial Alignment Velocity Damping Fiber Optic Compass

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