The relative formula of scalar product trance of variance matrixes of state variable and its conjugate one is used for calculating influence of single or many disturbances on statistical performance of vehicle and other dynamic systems.

This paper studies the statistical performance of several well-known DOA (Direction of Arrival) estimators of underwater multiple targets by the computer simulation, which offers an important idea for the underwater array processing.

It discusses and analyzes the importance and necessity of security analysis and statistical performance test in cipher algorithm design, and presents the general methods and algorithms, which are applied in the statistical performance test of block cipher algorithm.