Conclusion

This book mainly investigated the attitude control problem of satellites with modeling error. To achieve this objective, motivated by the superior performance ensured by the nonlinear control theory, several advanced nonlinear compensation error approaches were developed for satellite with its attitude controller with high performance even in the presence of other physical constraints. Those approaches were categorized into three types and presented in Part, Part 2.9, and Part 5.8, respectively. The first type was the robust compensation attitude control methods in Part. They compensated for the modeling error in the sense that the attitude control performance has great robustness to the modeling error by tunning control gains. The second type was the adaptive compensation attitude control strategies in Part 2.9. They adaptively estimated the severe case (i.e., the upper bound) of the modeling error and then adaptively compensated for them. The third type was the observer-based compensation attitude control approaches in Part 5.8. For those approaches, observers were designed first to estimate or reconstruct the modeling error, and then the attitude controllers were synthesized by using the estimation value to achieve attitude control. In general, the approaches in this book eliminated the drawbacks of the most of the existing compensation control schemes. The detailed features and advantages of those developed compensation-based attitude control approaches were highlighted as follows.