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.