捷联制导系统信号延时隔离度抑制方法

针对捷联导引头视线角速度(line of sight rate，LOSR)计算时制导信号延时带来较大的隔离度(disturbance rejection rate，DRR)问题,首先分析了捷联制导系统信号延时产生隔离度的原因,推导了制导信号延时隔离度传递函数。进一步通过对视线角速度计算中信号时序关系分析,得到了导引头与惯导（inertial navigation system，INS）数据更新频率不成整数倍的关系和信号处理传输时间等是导致制导信号延时的主要原因。在此基础上,提出通过在导引头和惯导数据帧中增加时间标记的方式,使主控机可以提取同一时刻制导信号数据进行视线角速度计算,从而大幅减小制导延时产生的隔离度。数学仿真和半实物仿真表明,该方法在很大程度上减小了制导信号延时带来的导引头隔离度。

Guidance signal delay disturbance rejection rate suppress method for strapdown guidance system

To solve the strapdown system guidance signal delay caused serious disturbance rejection rate(DRR) in line of sight rate(LOSR) estimate. Firstly, the reason guidance signal delay in the strapdown guidance system caused DRR in LOSR estimate is analyzed and the guidance signal DRR transfer function is derived. Then from the analysis of the signal process in LOSR estimate, the inertial navigation system (INS) data update frequency, and the signal process or transport time caused guidance signal inconsistence in LOSR estimate are put forward. On this basis, the method adds the time mark in the INS and the seeker data frame is proposed, so the main controller can use the same time INS and seeker data to decrease the DRR caused by guidance signal delay. The mathematical simulation and hardware in the loop simulation indicate that the method greatly reduces the DRR caused by the guidance signal delay.