BTT控制回路匹配性对制导脱靶量影响研究

Research on Influence to Guidance Miss-Distance by BTT Control

针对BTT导弹俯仰及滚转通道驾驶仪不同速度匹配关系对制导回路脱靶量的影响问题,以BTT-90逻辑及比例导引律为基础,通过对控制回路的合理简化及对BTT指令转换和运动学关系的非线性建模,构建了体现BTT控制特性的比例导引制导原理模型.以初始速度指向偏差及目标常值机动分别表征对静止及运动目标攻击条件,分析了在不同末导时间下俯仰-滚转通道快速性及其匹配关系对制导脱靶量的影响.分析结果表明,BTT用于末制导时,俯仰与滚转驾驶仪之间相对更慢的回路决定了整个控制系统等效响应速度;制导回路脱靶量收敛至0的必要条件是末导时间大于10倍控制系统动力学时间常数;提高滚转回路响应速度并使之快于俯仰回路,是保证制导脱靶量的关键;在相同可用加速度和俯仰回路响应速度条件下,仅当滚转通道速度为俯仰的5倍时,BTT制导脱靶量才接近于STT.

In order to analyze the miss distance caused by the matching performance between pitch and roll control channels, a principle model about BTT guidance was built base on the BTT- 90 command calculation logic and proportional navigation guidance law. The model included the simplified control system model and nonlinear model about guidance command calculation and aerodynamic translation. Taking the velocity pointing error and target maneuvering as the analysis conditions, the influence on the miss distance was analyzed and the STT control was compared also. The simulation results show that the total aerodynamic of system is determined by the slower autopilot within the pitch and roll control channels when BTT control used in the end guidance. It is the essential condition for the miss distance converging to zero, that the guidance time is 10 times more than the aerodynamic time constant of the control system. To insure the high guidance accuracy, the response rate of the roll control channel should be faster than that of the pitch control channel. And only the response rate of the roll control channel is 5 times faster than that of pitch control channel, the miss distance of BTT will be close to thatof STT.