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Through much research on unscented Kalman filter based on scaled and square-root algorithm in autonomous navigation, it is known that these algorithms take so much time on calculation. So an improved unscented Kalman filter algorithm is proposed in the paper for autonomous navigation to solve the non-real-time difficulty. Simple scheme is adopted to predigest the choose procedure of sigma-points and...
The shape of planetoid is irregular, and its quality is non-uniform. Moreover, environment of explorers circling round small celestial bodies changes very quickly. In order to improve the orbit precision, an autonomous optical navigation scheme based on unscented Kalman filter and scale invariant feather transform is proposed to determine the circle orbit state in time, in which star sensor and navigation...
Let (X 1 ,X 2 ,...,X n ) and (Y 1 ,Y 2 ,...,Y n ) be gamma random vectors with common shape parameter α(0<α=<1) and scale parameters (λ 1 ,λ 2 ,...,λ n ), (μ 1 ,μ 2 ,...,μ n ), respectively. Let X () =(X (1) ,X (2) ,...,X (n) ), Y...
For the dynamic password scheme, it is found that there is spoofing attack and the key length of ElGamal algorithm adopted by the scheme will increased rapid with the increase of intensity. This paper decided to use elliptic curve cryptosystem instead of the original and analyses the root cause of the server forgery attack. In this paper, first given the original proposal and then analyses its problems...
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