Navigation and Control Architecture for Launch Vehicles Figure 14. Results of real-time NRHC on a preplanned trajectory, with ±10% deviation/noise, showing both variances vs. nominal condition. COMBINED VARIANCES Finally, because both types of variances may need to be handled in real life, a set of 1,000 Monte Carlo simulations was run on a square wave scenario that combined the two variances. 14 Figure 15. Results of real-time NRHC on an on-the-fly trajectory, with ±10% deviation/noise, showing both variances vs. nominal condition. As shown in Figures 14 and 15, even with both uncertainties, the deviation from the nominal trajectory is roughly comparable to the deviations from the individual uncertainties combined. Additional testing of combined variances beyond ±10% was performed to see how far the system could be pushed while re- IEEE A&E SYSTEMS MAGAZINE APRIL 2018