Processing of the Shaking Feedforward Data of Space Instrumentation Ships

Ship-shaking feedforward is a tracking and control vessel stabilization design method and it is field-proven to be beneficial to improvement of system error.Feedforward on object speed,especially acceleration feedforward,is better than feedforward on ship-shaking in the improvement.Two reasons result in this.First,object flight change is slower than ship-shaking change and has more low frequency components and thus provides for higher precision data following filtering.Second,ship-shaking feedforward,especially acceleration feedforward,is more difficult to calculate accurately.Therefore,accurate calculation of feedforward is the key to compensate for errors caused by servo system lag and to realize high accuracy tracking of an object.Equations are presented for calculation of ship-shaking feedforward and they are validated through application in satellite launch support missions.