PI and Feedforward Controllers

  • Wodek Gawronski
Part of the Mechanical Engineering Series book series (MES)
Tuning process of the antenna controller is discussed in two steps:
  1. 1.

    analysis of a simple (i.e., rigid) antenna and simple (PI) controller (to derive basic properties of the closed loop system),

  2. 2.

    extension of the properties of a simple system to the real (flexible) antenna and a complex (LQG or H) controller.


The first step is discussed in this chapter, the second step in the next two chapters.

The combination of PI controller and rigid antenna allows for the closed-form analysis. The analysis includes the relationship between the proportional and integral gains and the closed loop properties of the antenna. This leads to the tuning method for the PI controller and to the closed loop equations of a flexible antenna with the PI controller. Next, the performance of the PI controller and its limits are discussed. Finally, the feedforward controller is analyzed.

Properties of the PI Controller

The block diagram of the antenna control system is shown in Fig. 7.1a. For a rigid...


Transfer Function Close Loop System Settling Time Wind Gust Feedforward Loop 
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  1. 1.
    Gawronski W. (2007). Servo Performance Parameters of the NASA Deep Space Network Antennas. IEEE Antennas and Propagation Magazine, 49(6).Google Scholar
  2. 2.
    Gawronski W, Mellstrom JA. (1994). Antenna Servo Design for Tracking Low-Earth-Orbit Satellites. AIAA J. Guidance, Control Dynamics, 17(6):1179–1184.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Wodek Gawronski
    • 1
  1. 1.California Institute of TechnologyJet Propulsion LaboratoryPasedenaUSA

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