Up-to-date SBAS DFMC Service Volume Prototype (DSVP) to support DFMC performance characterization activities

<h3>Abstract</h3> China is developing its BeiDou Satellite-Based Augmentation System (BDSBAS) in accordance with international standards, and it has provided initial Single Frequency (SF) and Dual-Frequency Multi-Constellation (DFMC) services since July 2020. This paper gives a comprehensive introduction to BDSBAS from the aspects of its general design, system time datum, coordinate reference system and signal characteristics. The performance requirements and internationalization endeavors of BDSBAS also are presented. Additionally, the initial performance tests of BDSBAS SF service had been carried out based on the first two BDSBAS Geosynchronous Earth Orbit (GEO) satellites, including the quality of signal-in-space, and initial accuracy, integrity and availability. The results show that the characteristics of BDSBAS signal-in-space can well meet the requirements of the International Civil Aviation Organization (ICAO), and the initial performance of BDSBAS SF service can basically meet the requirements of Approach with Vertical guidance I (APV-I). Finally, before the application of BDSBAS services into civil aviation uses, testing and certification will be organized by the Civil Aviation Administration of China (CAAC) and carried out in three steps. In the future, China will continue to promote the development of BDSBAS in a steady manner in order to provide aviation integrity services compatible with the ICAO standards in China and the surrounding areas as soon as possible.

The positioning accuracy and integrity of the Ground-Based Augmentation System (GBAS) are impacted by the abnormal troposphere and ionosphere conditions resulting from extreme weather and intense radiation. Non-nominal troposphere error will increase the residual tropospheric uncertainty between the GBAS ground facility and aircraft. The plasma bubbles may induce signal scintillations while passing across a signal path, which could result in a loss of lock or a cycle slip. However, existing methods cannot deal with the threats caused by abnormal meteorological conditions. To reduce the impact of these conditions on GBAS, this paper describes an optimization method. By reassessing the weight matrix W in the calculation of the Vertical Protection Level (VPL), satellites that suffer from bigger pseudorange errors are assigned less importance in the positioning solution. Therefore, the positioning accuracy and integrity of GBAS are improved. Initially, we evaluate the Geometric Dilution of Precision and VPL for both single GPS and GPS+BDS constellations under abnormal meteorological conditions. The performance of different orbiting satellites in such conditions is then evaluated to further analyze their benefits in future Multi-Constellation Dual Frequency (MCDF) GBAS. The results show that the proposed optimization method can effectively reduce the influence of abnormal meteorological conditions and improve the positioning accuracy and integrity of MCDF GBAS. Moreover, mixed orbiting satellites provide more robustness against abnormal meteorological conditions and can significantly enhance the performance of MCDF GBAS.

Dual-frequency multi-constellation (DFMC) satellite-based augmentation system (SBAS) is a new SBAS standard for aeronautical navigation systems. It supports aircraft navigation from the enroute to approach phases via the L1 and L5 frequencies (1575.42 and 1176.45 MHz). Although the ionosphere-free (IF) combination in the DFMC SBAS operation removes the first-order ionospheric delays in the pseudorange measurement, remaining terms including the satellite-clock offset errors and higher-order ionospheric (HOI) delays are still unaccounted for. The DFMC SBAS accuracy and integrity can be affected by the HOI effects, especially during severe ionospheric disturbances. In this work, we present the local DFMC SBAS corrections with and without the mitigation of HOI delays. We first estimate the HOI delay terms using the received pseudorange followed by separate satellite and receiver bias estimations based on the minimum sum-variance technique. The integrity terms can then be obtained. The performances of DFMC SBAS using the global navigation satellite system (GNSS) data including GPS, Galileo, and QZSS are evaluated using obtained GNSS data at stations in Thailand on the ionospheric quiet and disturbed days. The results show that with the HOI mitigation, the vertical positioning errors (VPE) on the quiet and disturbed days can be improved by 12% and 9%, whereas the vertical protection levels (VPL) are improved by 16% and 21%, respectively. In addition, we perform a preliminary assessment of DFMC SBAS based on the International Civil Aviation Organization (ICAO) requirements of two categories: Localizer Performance with Vertical guidance (LPV-200) and Category I precision approach (CAT-I) showing promising results.

Design of BDS-3 integrity monitoring and preliminary analysis of its performance

We provided an overview of various satellite-based augmentation systems (SBAS) options for augmented GNSS services in Australia, and potentially New Zealand, with the aim to tease out key similarities and differences in their augmentation capabilities. SBAS can technically be classified into two user categories, namely SBAS for aviation and "non-aviation" SBAS. Aviation SBAS is an International Civil Aviation Organization (ICAO) certified civil aviation safety-critical system providing wide-area GNSS augmentation by broadcasting augmentation information using geostationary satellites. The primary aim was to improve integrity, availability and accuracy of basic GNSS signals for aircraft navigation. On the other hand, "non-aviation" SBAS support numerous GNSS applications using positioning techniques such as wide-area differential-GNSS (DGNSS) and precise point positioning (PPP). These services mainly focus on delivering high-accuracy positioning solutions and guaranteed levels of availability, and integrity remains secondary considerations. Next-generation GNSS satellites capable of transmitting augmentation signals in the L1, L5 and L6 frequency bands will also be explored. These augmentation signals have the data capacity to deliver a range of augmentation services such as SBAS, wide-area DGNSS and PPP, to meet the demands of various industry sectors. In addition, there are well-developed plans to put in place next-generation dual-frequency multi-constellation SBAS for aviation. Multi-constellation GNSS increases robustness against potential degradation of core satellite constellations and extends the service coverage area. It is expected that next-generation SBAS and GNSS will improve accuracy, integrity, availability and continuity of GNSS performance.

Introduction: The International Civil Aviation Organization (ICAO) acts as an organization that notifies civilian aircraft that will pass in conflict areas and also cooperates with other countries in increasing ICAO supervision so that similar cases do not occur. Purposes of the Research: To know the role of ICAO (International Civil Aviation Organization) in handling international aviation safety supervision and cases of shooting down civil aircraft in conflict areas. Methods of the Research: This type of research can be classified as a normative research type, this research uses research methods on the principles of international law. This research is a descriptive analysis, namely describing and analyzing the problems that have been put forward to describe an overview of the International Civil Aviation Organization in handling cases of shooting down civil aircraft in conflict areas related to international air law. Results of the Research: International civil aviation, especially when crossing conflict zones while the Civil Aviation Convention (known as the Chicago Convention) establishes a framework for civil aviation investigations, does not provide an appropriate legal and institutional framework for accountability, ICAO's role as a specialized agency of the United Nations which is required from time to time to refrain from violations. International political parameters in its diplomatic efforts

This article presents analysis results from a long-term multi-site Global Navigation Satellite System (GNSS) Radio Frequency Interference (RFI) monitoring campaign in the context of Ground Based Augmentation System (GBAS) Dual Frequency Multi Constellation (DFMC) concept operation. GBAS resilience against unintentional RFI is an important area for investigation as the ground station receivers often must operate adjacent to high-traffic roads where chances of being affected by RFI are high. To be able to develop algorithms and reaction strategies necessary to ensure continuity and availability of service, knowledge of interference signal characteristics and frequency band/bands affected, as well as relative occurrence rates between the considered frequencies and frequency combinations, is necessary. The analysis presented in the article covers the prevalence and properties of the RFI events observed on the GPSs L1 and L5 and the Galileo E1 and E5a frequency bands that are considered by the on-going DFMC GBAS concept development initiatives. Due to being spectrally adjacent, the observed event analysis is also carried out for the Galileo E5b and GLONASS G1 frequency bands. The article also addresses the issue of spectral occupancy distribution of the observed events and presents new interesting RFI event types captured during the considered monitoring period.

The article deals with crimes against air transport, which can be divided into two groups: seizures of aircraft and other crimes against civil aviation safety. The normative and legal definition of the classification of international crimes, disagreement in legal qualification and terminological definition of these crimes under the legislation of foreign states, as well as the lack of practical application of legal norms of conventions in combating international crimes, in part of the extradition, creates certain difficulties for the legislation. further extradition of persons hiding from investigation and court in a foreign state. In the crime of international character, similar to the internal state, the composition of the crime of international character is allocated, which is a set of objective and subjective features, based on which individuals attracted to criminal responsibility. But it should be noted that the elements of the crime of international character do not always coincide with elements of a crime in domestic criminal law. Basic normative acts aimed at providing aviation safety, operate on three levels: global level (International Civil Aviation Organization (ICAO), basic documents: Crimes Convention and some other acts committed on board aircraft (Tokyo, 1963) ; Convention on the fight against illegal capture of aircraft (GAAGA, 1971); Convention on the fight against illegal acts directed against the safety of civil aviation (Montreal, 1971); Protocol on the fight against acts of violence at airports serving civil aviation (Montreal, 1988, complements the Montreal Convention in 1971); Convention on the marking of plastic explosives in order to detect (Montreal, 1991); Convention on the fight against illegal acts concerning international civil aviation (Beijing, 2010) ; regional level (European Aviation Security Agency (EASA), European Civil Aviation Conference (ECAC), European and North Atlantic Bureau of ICAO (Paris), Found Documents – Politics of the European Civil Aviation Conference in Aviation Safety; National Level – State Aviation Administration (SAA), Basic Documents: Air Code of Ukraine of 19.05.2011, Law of Ukraine “On the State Program of Aviation Safety of Civil Aviation” dated 20.02.2003, Order of the Ministry of Transport and Communications of Ukraine No. 390 dated May 11, 2007, instructions for assessing the risk of security of civil aviation of Ukraine.

The article deals with crimes against air transport, which can be divided into two groups: seizures of aircraft and other crimes against civil aviation safety. The normative and legal definition of the classification of international crimes, disagreement in legal qualification and terminological definition of these crimes under the legislation of foreign states, as well as the lack of practical application of legal norms of conventions in combating international crimes, in part of the extradition, creates certain difficulties for the legislation. further extradition of persons hiding from investigation and court in a foreign state. In the crime of international character, similar to the internal state, the composition of the crime of international character is allocated, which is a set of objective and subjective features, based on which individuals attracted to criminal responsibility. But it should be noted that the elements of the crime of international character do not always coincide with elements of a crime in domestic criminal law. Basic normative acts aimed at providing aviation safety, operate on three levels: global level (International Civil Aviation Organization (ICAO), basic documents: Crimes Convention and some other acts committed on board aircraft (Tokyo, 1963) ; Convention on the fight against illegal capture of aircraft (GAAGA, 1971); Convention on the fight against illegal acts directed against the safety of civil aviation (Montreal, 1971); Protocol on the fight against acts of violence at airports serving civil aviation (Montreal, 1988, complements the Montreal Convention in 1971); Convention on the marking of plastic explosives in order to detect (Montreal, 1991); Convention on the fight against illegal acts concerning international civil aviation (Beijing, 2010) ; regional level (European Aviation Security Agency (EASA), European Civil Aviation Conference (ECAC), European and North Atlantic Bureau of ICAO (Paris), Found Documents - Politics of the European Civil Aviation Conference in Aviation Safety; National Level - State Aviation Administration (SAA), Basic Documents: Air Code of Ukraine of 19.05.2011, Law of Ukraine "On the State Program of Aviation Safety of Civil Aviation" dated 20.02.2003, Order of the Ministry of Transport and Communications of Ukraine No. 390 dated May 11, 2007, instructions for assessing the risk of security of civil aviation of Ukraine.

The industry of civil aviation has suffered from international politics since almost the beginning. Although the necessary amendments, conventions and agreements were realized by participants of the international civil aviation system, the impacts of unlawful interferences never found an end. The political, economic and technological structure of civil aviation is suitable for the development of unlawful interferences. This research aims to shed more light on the relationship between international politics and civil aviation by utilising securitization and current comprehension of the theory of securitization. The research findings show that securitization is used in the civil aviation industry by aviational intellectuals in specific matters such as race and gender discrimination. Moreover and more importantly, the International Civil Aviation Organization (ICAO), national, regional and international institutions utilized securitization. At the end of the research, it is concluded that unlawful interferences such as complex terrorist actions and hijacking activities should be subjects of daily and structured speeches, conversations and rhetoric of aviational intellectuals to create a more secure sphere or context

The Standards and Recommended Practices (SARPs) of Annex 16 Vol. II, Chicago Convention 1944, are created and adopted by the International Civil Aviation Organization (ICAO), for the purpose of regulating aircraft emission in the civil aviation sector. The creation of ICAO standard and Recommended Practices on aviation environment came up in 1981, following the declaration in Article 2(2) of Kyoto protocol to UNFCCC that developed countries of (Annex I parties), shall pursue limitation or reduction of emission of greenhouse gases from aviation by working through the international civil aviation organization (ICAO). However, while the SARPS have been recognized by ICAO and the contracting states as the sole international regulations for reduction of aviation emission, the SARPs are also known to have some limitations on reduction of aviation emission. This paper therefore examines the capacity of SARPs Annex 16 Vol II of Chicago Convention 1944 to make effective reduction in international reduction of aviation emission for protection of environment. This involves identifying the strength and limitations of ICAO SARPs on reduction of aviation emission as well as making recommendations for improved performance. A qualitative-doctrinal research approach is adopted where by the bulk of analysis on the study is based on information from library research materials the study concludes the ICAO SARPs have more limitations than strength and would require some improvement for achieving a more effective reduction in aviation emission.

The Global Navigation Satellite System (GNSS) is the worldwide set of satellite navigation constellations, civil aviation augmentations, and user equipment. This paper reviews the current status and future plans of the elements of GNSS as it pertains to civil aviation. The paper addresses the following satellite navigation systems: the U.S. Global Positioning System (GPS), Russian GLONASS, European Galileo, Chinese Compass, Japanese Quasi Zenith Satellite System, and Indian Regional Navigation Satellite System. The paper also describes aviation augmentations including aircraft-based, satellite-based, ground-based, and ground-based regional augmentation systems defined by the International Civil Aviation Organization. Lastly, this paper details typical user equipment configurations and civil aviation applications of GNSS including navigation, automatic dependent surveillance, terrain awareness warning systems, and timing.

Abstract.The study of the formation of adaptive competence of future pilots in the training process is relevant given the active integration of Ukrainian aviation into the world community, development of relations and increasing interoperability of Ukrainian military aviation with the NATO Air Forces, in accordance with the Military Doctrine of Ukraine and the Strategic defense bulletin, as well as the urgent need to use the rules of the International Civil Aviation Organization (ICAO), the International Air Transport Association (IATA) and the European Aviation Safety Agency (EASA), which cooperate with ICAO, when using the common airspace. Recently, civil and military aviation have been working closely together, and military pilots are increasingly involved in evacuating the population during emergencies abroad, multinational military exercises, etc.&#x0D; Pilots of civil and military aviation of Ukraine should adapt to the requirements of the new environment as soon as possible, and higher education institutions that train pilots should adjust the training process in accordance with the new requirements. The issue of adaptive competence in general and in particular, the adaptive competence of future pilots has not been sufficiently studied yet in the modern scientific literature and therefore needs further consideration. The article aims to define and characterize the basic concepts of formation of adaptive competence of future pilots in the process of their training, which will be followed by scientific substantiation, creation of structural-functional model of formation of adaptive competence of future pilots, and creation and approbation of author's technology at the educational institutions which train pilots.&#x0D; The article considers and investigates the concepts of adaptation and its types; professional adaptation of the pilot; adaptability; competencies and competency; professional competency of the future pilot, its components and criteria of its formation; concepts and features of adaptive competency of future pilots. It also describes and characterizes the features of the future activities of pilots and certain requirements for the training of pilots in civil and military aviation.&#x0D; Key words: adaptation, adaptability, competence, adaptive competence, professional training.

Global navigation satellite systems (GNSSs) will broadcast two open signals for civil aviation within the next ten years. Satellite-based augmentation system (SBAS) providers are currently developing the dual-frequency multi-constellation (DFMC) SBAS interface control document (ICD) to take advantage of the four GNSSs and two signals. In order to ensure the interoperability, a SBAS provider is allowed to determine the correspondence between DFREI and σDFRE based on the performance of its service within the frame of the ICD. Considering that the search space of the correspondence determination is too larger, an algorithm is proposed, which reduces the search space by decorrelating DFREIs. The evaluation based on real data shows that the effect of quantitation error resulted from the correspondence determined by the algorithm to SBAS service performance is neglectable, indicating that the algorithm is efficient. The algorithm could be of value for SBAS providers to design the correspondence.

Biometrics is a huge and very fast growing domain of methods for uniquely recognizing humans based on one or more intrinsic physical or behavioral traits with applications in many different areas, e.g., surveillance, person verification and identification. The International Civil Aviation Organization (ICAO) provides a number of specifications to prepare automated recognition from travel document photos. The goal of these specifications is to increase security in civil aviation on the basis of standardized biometric data. Due to this international standard, there is a high demand for automatically checking face images to assist civil service employees in decision-making. In this work, we present a face normalization and analysis system implementing several parts of the ICAO specification. Our key contribution of this analysis is the fusion of different established classifiers to boost performance of the overall system. Our results show the superior checking quality on facial images due to utilizing classifier fusion compared to a single classifier decision.