Alignment method of optical fiber strapdown compass system
A technology of connecting compass system and optical fiber, which is applied in the field of autonomous alignment of optical fiber strapdown compass system, and can solve the problems that the analytical alignment algorithm is difficult to meet the actual application requirements
Active Publication Date: 2013-12-25
SOUTHEAST UNIV
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Due to the influence of the working environment of the carrier, such as continuous swaying of the base, wind and wave interference, and mechanical vibration, the traditional analytical alignment algorithm is often difficult to meet the actual application requirements
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0049] The following examples describe the present invention in detail:
[0050] (1) Collect the output data of the inertial measurement components, including the output data of the three fiber optic gyroscopes, after the fiber optic strapdown compass system is turned on and warmed up and the output data f of the three quartz accelerometers b .
[0051] (2) According to and f b , and the Earth's angular rate of rotation ω ie, gravitational acceleration g, latitude L and other information, apply the coarse alignment algorithm based on parallel double-integrated gravity vector information to complete the coarse alignment of the optical fiber strapdown compass system, and obtain the initial attitude matrix
[0052] Run r attitude matrix calculation processes based on double-integrated gravity vectors in parallel at different initial moments, obtain r attitude matrix values at the same last moment, and fuse the r attitude matrix values to improve the reliability of the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides an alignment method of an optical fiber strapdown compass system. The method comprises the following steps: according to the parallel analyses coarse alignment algorithm based on double-integral gravitational vector, the coarse alignment of the optical fiber strapdown compass system is accomplished by utilizing fiber-optic gyro, quartz accelerometer data as well as the information, such as earth rotation angular rate, acceleration of gravity, latitude collected by the optical fiber strapdown compass system; a Kallman filtering model of the optical fiber strapdown compass system fine alignment which takes a default angle as the system state, and takes specific force information as system measurement is established according to fine alignment method based on specific force; and a pose matrix is amended by utilizing a default angle information closed loop estimated by filter waves, and the fine alignment of the optical fiber strapdown compass system is accomplished. The method provided by the invention has the following advantages: (1) the system random error is subjected to smooth restraining by the coarse alignment algorithm through double-integral algorithm and the parallel fusion operation, and the precision and reliability of the coarse alignment are improved; and (2) the filtering model of the alignment algorithm is simple.
Description
technical field [0001] The invention relates to a measurement technology for the heading and attitude of a carrier, in particular to an autonomous alignment method of an optical fiber strapdown compass system. Background technique [0002] With the rapid development of fiber optic gyro technology, fiber optic strapdown compass has become a research hotspot at home and abroad. Compared with the traditional gyro compass, the fiber optic strapdown compass has the advantages of all solid state, small size, fast start-up and high reliability. The alignment time of LITEF’s LFK-95 fiber optic strapdown compass is 30 minutes, the heading accuracy is 0.7°secL, and the horizontal accuracy is 0.5°. The French IXSEA company’s OCTANS fiber optic strapdown compass can complete the alignment within 5 minutes, and the heading accuracy reaches 0.1°secL, horizontal accuracy better than 0.01°(RMS). At present, fast and accurate autonomous alignment technology is a key technology of fiber opt...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
Inventor 程向红周本川王宇邵刘军
Owner SOUTHEAST UNIV