Browse

In this paper are presented some studies concerning energy conversion systems for High Altitude Pseudo-Satellites (HAPS). In the first part of the paper, a state-of-the-art in the field of energy conversion systems on board of high altitude UAVs together with the identification of future trends in electrical propulsion of aircrafts are shown. The interfacing between the fuel cells and the bus, as well as the bus voltage adjustment is made via the DC to DC converters. Simple type boost converters are lighter, but h...

This paper presents some studies concerning hybrid power sources fuel cell, new generation photovoltaic cells with high efficiency and small battery based for High Altitude Pseudo-Satellites (HAPS). HAPS are recent entrants UAS-s in both directions of research of major aviation companies. Their goal is to replace services provided by classical communications and surveillance satellites, which show a high cost, with services provided by much cheaper technology platforms. It is exposed a state-of-the-art in the fiel...

The paper presents a MEMS-INS/GPS data fusion algorithm based on an adaptive neuro fuzzy inference system for the prediction of the navigation solution errors during GPS outages. The study was performed during the second stage of a research project related to the structural design of a data fusion intelligent algorithm based on an adaptive neuro-fuzzy inference system and Kalman filtering, for the prediction of the positioning errors during GPS signal outages. In this stage, the project research team targeted to r...

A methodology to obtain an intelligent miniaturized three-axial gyro detection unit is exposed in this paper. The presented mechanism is based on the on-line estimation and compensation of the sensors errors generated by the environmental temperature variation. Because these kind of errors are in a strongly nonlinear complex dependence of the values of environmental temperature and of the angular speed exciting the sensor on each of the three sensing axis, their correction may not be done off-line and requires an ...

Systematic cadastre is a work of great economic and social importance in any country. Determining the position of the land register boundaries of the lands on the basis of measurements. It includes description of buildings and land registry entries related to real estate rights, personal rights, acts, facts or legal relations connected with real estates and encumbrances or charges or how to exercise property ownership In the systematic cadastral are a number of steps that begin with the identification, measurement...

The paper presents a prediction algorithm for the low rate GPS data in order to fuse them with the high rate Inertial Navigation System (INS) data; a major shortcoming in the integration process of the two navigation systems is due to the significant difference in theirs data rates in the reading processes. The algorithm is based on a smart mechanism based on adaptive neuro-fuzzy inference systems (ANFIS) concept, and includes an adaptive network of fuzzy inference systems. Under the form of a five layer feed-forw...