Abstract: As to the deficiency of analog rebalance loops in terms of digital output and applications of modern control technology, the paper presents a way to design and implement digital rebalance loop for strapdown gyroscopes. Firstly, this paper introduces three types of realizations of the rebalance loop of strapdown gyroscopes, and proposes a new way to design and implement the rebalance loop. Secondly, we set up the mathematical model for the entire loop. According to the prevalent problem of the quantization error in the digital loop, we adopt the golden section based on characteristic model to design the controller. Finally, we simulate the mathematical model of the loop, and validate the performance of the rebalance loop. Simulation results demonstrate that the way of the loop implementation proposed in this paper can improve effectively the loop performance.

Key words: strapdown gyroscope, digital, rebalance loop, golden section control, quantization error