Thirdly,a metric of attitude precision was defined,which was frame-invariant and scale-invariant and an index of attitude precision.

Improving attitude determination accuracy via compensating stand-alone position error;

The precision measuring analysis instrument structure of the missile weapon system is designed according to loop design idea and the feature of the missile weapon system,then the mathematics models of warship kinematics,error analysis and collecting data are established,the total precision index and inspection method of missile weapon system are finally defined.

Firstly,the measuring construction of precision index of ship to ship missile weapon system is designed according to function distribution of ship to ship missile weapon system.

Utilizing the random uncertainity of steady line precision index to calculate the standard difference,analyzes the big or the abnormal survey point,devide regulation relationship curve shape and the suitable operation method to make relationship curve satisfy the precision index,then to improve the flow precision.

Based on a common model of data processing for GPS relative positioning, this paper deduces accuracy indicators which have notions of relative positioning geometry.

And accuracy indicators for estimating positional error of area primitives and area of uncertainty region are also given.

On the basis of this, a set of accuracy indicators forpoint and line features are presented.