Aerospace Research in Bulgaria 

About: Aerospace Research in Bulgaria is an academic journal published by Pensoft Publishers. The journal publishes majorly in the area(s): Computer science & Engineering. It has an ISSN identifier of 1313-0927. It is also open access. Over the lifetime, 34 publications have been published receiving 4 citations.

Mathematical Model for Operation of Aviation Systems for Delivery of Special Means to Air and Earth Objects

Abstract: The development of technologies allows the improvement of the algorithms for the operation of aviation systems for the delivery of special means to air and ground objects. The aim is to increase their efficiency, while facilitating the work of the crew in case of lack of time to complete the task. A mathematical model for the operation of this type of aviation systems for the supply of special equipment has been developed, which allows reducing the volume of the existing protocol for the implementation of the crew. It is proposed to use a common ballistic algorithm, combining different groups of special means of delivery to air and ground sites.

Challenges in International Research on Celestial Bodies. The Prospects of the Bulgarian Space Policy

Abstract: The article explores the present political challenges in international research and exploration of states and private actors of celestial bodies. The lack of shared vision of what type of space activities should be planned and the principles of creating research facilities and scientific missions on the Moon and other celestial bodies is causing uncertainty in future space missions and increases the possibility for a military conflict. The political alliances that exclude specific states will increase the risk of a generation of unnecessary space debris and space waste on celestial bodies. This dangerous outcome could be prevented by agreeing on a shared vision of exploitation and exploration of celestial bodies that preserve the outer space environment and adopting comprehensive guidelines for space activities accepted by the leading space-faring nations.

Use of Open, Spatial and Satellite Data for the Purpose of Researching Landfills for Municipal

Abstract: The present work traces the development of an illegal landfill near the town of Svoge in Bulgaria. After 2016, a waste management plan is prepared on the territory of the municipality and a decision is made to dispose of it by depositing it in a regional landfill for municipal waste in the town of Kostinbrod. The aim of the study is to trace the development of biochemical processes that took place on the territory of the former landfill and whether their impact continues to this day. Data from the Open Data Portal (https://data.egov.bg/), the National Spatial Data Portal INSPIRE (https://inspire.egov.bg/bg), satellite data and GIS, several spectral profiles and indices such as Normalized difference vegetation index (NDVI), Tasseled Cap Transformation (TCT) were used. Composite images from the multispectral instrument (MSI) of the Sentinel 2 platform and radar (SAR) from the Sentinel 1 platform of the Copernicus program of the European Space Agency were used. The surface temperature of the landfill was calculated using the heat channels from the Landsat 5-7 (ETM) and Landsat 8 and Landsat 9 (OLI / TIRS) sensors. A combination of radar and optical data was made. Data from different seasons and years were used in order to monitor the dynamics of thermal pollution in the study area. Quantitative and qualitative assessment of the territory on which the landfill is located has been made. Last but not least, the role of high-value open data in environmental monitoring has been demonstrated, which will reduce the administrative burden of making responsible decisions for each smaller municipality and will be successfully implemented in future methodologies for improving Digital twins through technical work in Destination Earth (DestinE) and information about any point, area or globally significant territories.

Within-Field Mapping of Winter Wheat Biophysical Variables Using Multispectral Images from UAV

Abstract: The paper presents the results from a study aiming to map the dynamic of biophysical variables of winter wheat crops in different phenological growth stages (PGSs) using multispectral camera data acquired by Unmanned Aerial Vehicle (UAV). The studied biophysical variables are Leaf Area Index (LAI), fraction of Absorbed Photosynthetically Active Radiation (fAPAR) and fraction of vegetation cover (fCover). During agricultural year 2016/2017, 4 field campaigns (FCs) were carried out in 6 farmer-managed fields sown with two winter wheat varieties. During the FCs, 8 UAV flight missions were accomplished. Linear and exponential regression models were designed and evaluated to derive predictive equations for the biophysical variables of the crops based on a set of vegetation indices (VIs). The best predictor for all biophysical variables was OSAVI (RMSE was 0.90 m2/ m2, 0.07 and 0.08 for LAI, fAPAR, and fCover respectively). The chosen models were used to compose maps of LAI, fAPAR, and fCover of the studied fields. The maps correspond well with the spatial distribution of the values of the respective biophysical variables measured during the respective field campaign.

Opportunities to Optimize the Management of Aerospace Projects

Abstract: The creation and effective functioning of global satellite systems will allow to create an information base for solving problems related to the regeneration and rational use of natural resources, the creation of a single dynamic model of the Earth, including geological, climatic, biosphere, ecological and social factors. Great attention should also be paid to the problem of increasing the safety of human life in the conditions of the rapid development of intercontinental transport links.