Laser gyro combined offset frequency method and combined device for inertial measurement of laser gyro

Abstract

The invention provides a laser gyro combined offset frequency method, belonging to the technical field of inertial navigation equipment. The method comprises the following steps: combination with two-way constant speed and mechanical shaking is adopted; a 1-3 axis laser gyro group is arranged on a two-way constant-speed offset-frequency rotary platform rotating around a vertical axis, all sensitive axes of the laser gyro are deviated from a beta angle of a rotary axis of the offset-frequency rotary platform and are driven by the rotary platform to rotate, and a component (alpha & cosine beta)of the rotary angle speed (alpha &) on all the sensitive axes of the laser gyro is the offset-frequency angle speed of the laser gyro; and simultaneously, the rotary angle speed (alpha &) carries outrotary modulation on the error of the laser gyro axis. In the laser gyro combined offset frequency method adopting combination of two-way constant speed offset frequency and mechanical shaking offsetfrequency, not only is the accuracy guaranteed, but also the difficulties for design and manufacture are reduced. The laser gyro combined offset frequency method can be used for high-accuracy laser gyro strapdown inertial systems.

Description

technical field [0001] The invention belongs to the technical field of inertial navigation equipment, in particular to the improvement of laser gyro frequency bias technology. Background technique [0002] There are many kinds of frequency biasing technologies for laser gyroscopes to solve the influence of laser gyroscope locking effect. The mechanical jitter frequency bias technology is the most widely used, while the rate frequency bias technology achieves the highest accuracy. However, neither of these two frequency bias techniques can completely eliminate the influence of the "lock-in" effect, and the over-lock zone error is still the main source of error. Only the bidirectional constant speed bias technology used in the invention patent "Bidirectional constant speed bias laser gyro north finding method and bidirectional constant speed bias laser gyro north finder" with the patent publication number of CN 101738182A can completely eliminate the "locking" effect Impact....

AI Technical Summary

Problems solved by technology

But it doesn't work continuously without interruption

[0003] Although the "two-way constant speed and mechanical jitter combined frequency bias method" of the laser gyroscope cannot completely eliminate the influence of the "lock-up" effect, it can work continuously and uninterruptedly, and its effective accuracy can reach the existing rate frequency bias technology, and the project implementation Easier than the rate bias technique

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