Controller synthesis for flexible spacecraft using multivariable loop-shaping and factorization methods

The problem of designing fine-pointing controllers is considered for large, flexible space structures using modern multivariable synthesis methods. The first method is an iterative procedure which utilizes frequency domain singular value techniques, and is found to yield satisfactory performance and robustness. For the second method, which is based on coprime factorizations, a particular bi-coprime factorization is obtained, and the steps in the design process are described. This method is still under development.