关键词: 船舶、舰船工程, 捷联惯导, 阻尼网络, 频率特性

Abstract: The damp network design for strapdown inertial navigation system (SINS) was studied according to the control model and error characteristic of SINS horizontal loop. The stability and frequency characteristic of the system was analyzed on the basis of the control model. As the logarithmic magnitude curve of the horizontal loop model on different frequency bands reflected different performance of the system, a design method based on the expected curve was proposed. In the method, the time-domain performance indexes were transformed to frequency parameters, by which the expected logarithmic magnitude curve was plotted. Finally the damp network parameters were obtained. Digital simulation and test on sea for SINS were completed. In the simulation the Schuler oscillation in attitude error was damped to zero and the position error was increased to 1.5 nmile/24 h from 4 nmile/24 h, and in the test on sea the attitude accuracy improved by 1 order and the position accuracy improved by 1 time when the damp network was cascaded into the SINS. Compared with the network designed by the tentative method, this damp network has the same steady-state performances and less overshoot and settling time.

Key words: ship engineering, strapdown inertial navigation system, damp network, frequency characteristic