Digital Signal Processing

2110 Submissions

[2] viXra:2110.0151 [pdf] submitted on 2021-10-25 08:48:24

Foundations for Strip Adjustment of Airborne Laserscanning Data with Conformal Geometric Algebra

Authors: Eckhard Hitzer, Werner Benger, Manfred Niederwieser, Ramona Baran, Frank Steinbacher
Comments: 34 Pages. Accepted for publication in Advances in Applied Clifford Algebras, Oct. 2021, 1 table, 1 figure.

Typically, airborne laserscanning includes a laser mounted on an airplane or drone (its pulsed beam direction can scan in flight direction and perpendicular to it) an intertial positioning system of gyroscopes, and a global navigation satellite system. The data, relative orientation and relative distance of these three systems are combined in computing strips of ground surface point locations in an earth fixed coordinate system. Finally, all laserscanning strips are combined via iterative closes point methods to an interactive three-dimensional terrain map. In this work we describe the mathematical framework for how to use the iterative closest point method for the adjustment of the airborne laserscanning data strips in the framework of conformal geometric algebra.
Category: Digital Signal Processing

[1] viXra:2110.0094 [pdf] submitted on 2021-10-18 21:36:07

Simple and Effective Algorithm for Constant State Detection in Time Series

Authors: Andrei Keino
Comments: 4 Pages. GPL v. 3.0 License

The article introduces very simple and quite effective algorithm for constant state detection in time series. The algorithm, based on sliding window of variable length, searches a sections of time series with some given minimal length, that have all the values in some given range. It is shown that the computational complexity of aforementioned algorithm is O(N log N); where N is the length of time series.
Category: Digital Signal Processing