Autonomous non-overshoot state switching method of ship inertial navigation system

An inertial navigation system and state switching technology, applied in the field of inertial navigation, can solve problems such as the impact of inertial navigation system accuracy on ship navigation safety

Inactive Publication Date: 2012-04-18
NAVAL UNIV OF ENG PLA
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this compensation method depends on the externally measured speed, and there may be residual uncompensated ...

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Autonomous non-overshoot state switching method of ship inertial navigation system
  • Autonomous non-overshoot state switching method of ship inertial navigation system
  • Autonomous non-overshoot state switching method of ship inertial navigation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0071] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0072] Such as figure 1 The autonomous non-overshoot state switching method of a kind of ship inertial navigation system is characterized in that it comprises the following steps:

[0073] Step S11: According to the ship's motion state (speed, acceleration, frequency and amplitude of rocking motion), consider the two aspects of suppressing system error and reducing the influence of the correction link on the system circuit, and determine the damping ratio ζ suitable for the ship's state. The ratio ζ is 0 to 1, preferably 0.5;

[0074] Step S12: Determine the time-domain parameters of the correction link, the time-domain parameters include the resonance peak value M r and adjustment time t s ,

[0075] According to the relationship between the resonance peak of the second-order system and the damping ratio

[0076] M ...

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

No PUM Login to view more

Abstract

The invention discloses an autonomous non-overshoot state switching method of a ship inertial navigation system, comprising the following steps of: determining the damping ratio of a correction link; determining the time domain parameter during the calibration process; determining the cut-off frequency during the correction link; determining the system bandwidth; determining two handover frequencies during the correction link; determining a low-frequency band during the correction link; determining a high-frequency band during the correction link; determining the convergence frequency band of the correction link; determining the transmission function during the correction link; determining the switching time; determine the switching step length; determining the velocity variable before and after the correction; acquiring acceleration and angular velocity of the inertial device output; compensating for the inertia device output according to the error source of the inertial device; integrating the acceleration information to obtain the speed; acquiring a velocity correction value; acquiring speed after the correction; acquiring angular velocity information after the correction and feeding back by the Shura loop; and integrating the speed after the correction to obtain the position after the correction. By the adoption of the method provided by the invention, overshoot errors generated during the state switching process can be inhibited without depending on the external speed.

Description

technical field [0001] The invention relates to the technical field of inertial navigation, in particular to an autonomous non-overshoot state switching method of a ship inertial navigation system. technical background [0002] The horizontal loop of the inertial navigation system is essentially a critically stable second-order system. Under the action of error sources (gyro drift, accelerometer zero bias, etc.), the output of the system presents a periodic oscillation trend. In order to suppress the oscillatory error of the system, an effective solution is to add a correction link in the system loop to change the characteristic root of the system loop so that the loop has a damping effect to attenuate the oscillatory error caused by the error source. According to the control theory, after adding the correction link, the accuracy of the inertial navigation system is strongly affected by the acceleration of the carrier. Therefore, when the ship is in a maneuvering state, it i...

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
no application Login to view more
IPC IPC(8): G01C21/16
Inventor 查峰覃方君许江宁李安胡柏青李京书常国兵
Owner NAVAL UNIV OF ENG PLA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap