Marine integrated fiber optic gyro strapdown vertical reference system

Abstract

The marine integrated optical fiber gyro strapdown vertical reference system adopts an integrated design, all of which are installed in one shell, including the optical fiber gyroscope inertial group, I / F conversion circuit, pulse counting interface circuit, secondary power supply AC / DC circuit, digital interface circuit 1. The integrated information processor CPU collects the original data of three fiber optic gyroscopes, three accelerometer outputs and temperature sensors via the digital interface circuit and the pulse counting interface circuit, uses the pre-established error model to perform error compensation, and then performs inertial navigation Calculation, on the basis of navigation calculation, establish the state equation of the system, and perform kalman filter according to the auxiliary velocity information input from the outside world, obtain the attitude error through filtering and complete the correction of pure inertia, so as to obtain high-precision attitude information output . The invention realizes the full digital output interface, has the advantages of compact structure, long service life, high reliability, good environmental adaptability and low power consumption, and can be applied to ship-borne weapons, vehicle-mounted weapon systems and the like.

Description

technical field [0001] The invention relates to a strapdown vertical reference system, in particular to a marine integrated optical fiber gyroscope strapdown vertical reference system. Background technique [0002] The strapdown vertical reference provides high-precision attitude information for the ship and its weapon system, and is an important device on the ship. At present, the domestic traditional strapdown vertical reference uses a flexible gyroscope as an inertial instrument. Due to the complexity of the traditional mechanical gyroscope power supply system and the integrated design that is easy to interfere with each other, the traditional strapdown vertical reference contains at least two parts, one part is an inertial measurement unit. , and the other part is the circuit control box, which makes the system bulky and heavy. Moreover, in order to ensure the accuracy of the system in the mechanical and temperature environment, the traditional strapdown vertical datum ...

AI Technical Summary

Problems solved by technology

At present, the domestic traditional strapdown vertical reference uses a flexible gyroscope as an inertial instrument. Due to the complexity of the traditional mechanical gyroscope power supply system and the integrated design that is easy to interfere with each other, the traditional strapdown vertical reference contains at least two parts, one part is an inertial measurement unit. , the other part is the circuit control box, which makes the system bulky and heavy

Moreover, in order to ensure the accuracy of the system in the mechanical and temperature environment, the traditional strapdown vertical datum adopts the vibration reduction design, and adopts the temperature control technology for the temperature. Since the mechanical instrument is very sensitive to the mechanical environment, although there is vibration reduction, the vibration The system will still produce a large zero position error under impact, and because the system is large in size and takes a long time for thermal equilibrium, the system preparation time is long, generally more than 2 hours for preparation time, and it is difficult to meet the fast preparation time for the navigation system of new ships requirements

[0003] In recent years, the application of foreign fiber optic gyro marine inertial products has developed rapidly: in the early 1990s, the German LITEF company developed a shipboard strapdown heading and attitude reference based on the fiber optic gyro LCR-92, and reported in 1998 that the LFK- Type 95 gyrocompass system (LFK-95fiberopticgyrocompass, website www.litef.com); French Photonetics (www.ixsea.com) company has developed many types of fiber optic gyrocompass products in recent years, such as PHINS (equipped with ship integrated navigation system and other information Interface) series products, but its internal structure is kept secret, so there is no way to know

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