On a New Six Degree of Freedom Modelling Method for Homing Missiles and its Application for Design/Analysis

Defence Science Journal

A. Saha¹  R. N. Bhattacherjee¹ 

[1] Defence Research & Development Laboratory, Hyderabad

关键词: Proportional navigation;    Yaw LOS rates;    Newtonian equivalent model (NEM);    Seeker servosystem;    Homing missiles;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Development of an accuratesix-degree-of-freedom (6-DOF) simulation model for homing missilesincorporating seeker servosystem detailed modelling is reported. A newmodelling concept for seeker servosystem simulation, the Newtonianequivalent model (NEM) has been evolved, where body motion coupling ismodelled through forces and moments transformed to the seeker. TheNEM-based modelling of seeker head and its integration in 6-DOF has beendiscussed. In the presence of body coupling, the simulation model forseeker tracking or pointing error, gimbal angles and inertial line ofsight (LOS) rates as measured by the seeker mounted rate gyros have beenobtained through the new modelling method. A novel method of obtainingoptimum pitch and yaw LOS rates for proportional navigation (PN)guidance mechanisation is formulated based on synthesised sight linerates measured in the seeker inner gimbal axis. This new method has beenvalidated through simulation studies using the 6-DOF model developedand by comparing the results with those obtained by the conventionalmethod of generating LOS rates for PN guidance. Other importantapplications of the 6-DOF model discussed are guidance and controldesign validation/tuning seeker feedforward compensation design tuningof switchover point from open-loop to closed-loop PN guidance.Importance of the detailed 6-DOF simulation model as the ultimateperformance evaluation tool for the weapon system in terms of bothterminal performance and adequacy of seeker field of view, gimbal anglefreedom, etc. has been brought out.

【 授权许可】

Unknown