X. Y. XU ET AL.

574

PWPF are introduced in detail. The LQR technique is an

efficient way to achieve stability; it allows to select the

level of input signal, and to restrict the control com-

mands till acceptable performance is obtained. The

guidelines to select the weighting matrices of the cost

function for the optimal controller are also presented and

discussed in this work. The influence of PWPF modula-

tor parameters on the control performance is studied. The

analysis of the PWPF modulator presents an effective

method to tune its parameters. The tuning ranges of some

parameters are presented, and a set of approximate opti-

mal parameters for the PWPF is also obtained in this

work. Finally, simulation results demonstrate the feasi-

bility of the LQR/PWPF controller for RTACS, and rea-

sonable tracking accuracy in attitude is achieved. It is

worth to note that the LQR/PWPF controller can stabi-

lize the system for all initial states. The simulation re-

sults also show that improving the control precision in

midcourse will reduce the on-off frequency of thrusters

in terminal phase, and this is what we hope to achieve.

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