Abstract. Measurement error arising from vibration interference is recognized as the primary obstacle limiting accuracy and stability of laser absolute gravimeters. The present work addresses this issue by proposing a global search optimization algorithm that determines optimal value gravity based on measured time–displacement coordinates falling body signal obtained passive isolation system in...

due to damaging effects of speckle noise to information of radar images, reduction of these effects has been considered by many researchers. we discussed speckle reduction of radar images based on curvelet transformation. more specifically we discussed the speckle reduction with emphasizing on preservation of the edges by hard thresholding of curvelet transformation. in this algorithm, first mu...

Numerical solutions to problems differ from their analytical counterparts. Why? The reason for the difference is that most numerical computations involve error. There are two main types of error that can arise. The first, called roundoff error, arises from the fact that computers do not store real numbers instead they store a subset of real numbers: floatingpoint numbers. Thus the solution of c...