The interdisciplinary project ‘Hybrid sensor system for accurate indoor localisation’ aims to develop a high-precision, energy-efficient indoor localisation system combining Bluetooth Low Energy (BLE) and ultrasonic (US) technologies. HySSPIL aims to integrate the BLE's wide range capabilities and ultrasound flight time (ToF) accuracy, achieving precise localization suitable for a variety of indoor environments. Using BLE-based data transmission with ultrasonic beam forming, the project aims to create a new system that meets the increasing need for accurate indoor localization in sectors such as healthcare, smart buildings and augmented reality.The specific technical objectives of the application are:- Develop a scalable BLE-based localization subsystem with Arrival Angle (AoA) functionality using antenna arrays and inter-anchor communications,- Develop and implement ultrasonic beam forming and non-linear chip processing for accurate positioning, adjusting frequency conversion methods for use with standard mobile devices,- Integrate data fusion and post-processing methods to combine BLE and ultrasonic data, ensuring stable performance in environments with various obstacles and operating conditions.The main activities and work packages of the HySSPIL project include:1. Research involving at least one of the following research categories: Basic research, Industrial research; Experimental development:-DP1: Requirements analysis and system architecture development-DP2: Research and development of the BLE-based integrated perception and communication system-DP3: Research and Development of Ultrasonic Localization by Beam Formation and Downstream Transformation-DP4: Realisation of data aggregation and post-processing-DP5: Development and validation of a hybrid indoor containment system2. Acquisition, validation and protection of technological rights (intangible assets) resulting from research carried out:-DP6: Protection of technological rights3. Dissemination of knowledge generated by the project in the form of training, publications or knowledge and technology transfer:-DP7: Dissemination of results, communication and technology transfer4. Measures to ensure communication and visual identity requirements-DP8 Measures to ensure visual identityProject's planned main results:1. A functional TRL5 prototype for a Hybrid Indoor Localization System (HILS) that combines BLE and ultrasonic technologies to deliver accuracy below one metre,2. Patent application and licensing strategy for HILS technology, which promotes wider application and commercialization (licence agreement signed within 2 years after completion of the project),3. At least 6 original scientific articles in high-impact international journals or conference articles (indexed SCOPUS and Wos) showing advances in localisation and data pooling techniques.4. Increased development capacity in the field of smart indoor location systems.5. A comprehensive set of testing and validation reports for different indoor environments, ensuring the stable operation of the system.The objectives and expected activities of the HySSPIL project are in line with the transformation direction of the Latvian Smart Specialisation Strategy (RIS3) economy No.3: ‘Sectors with significant horizontal impact and contribution to economic transformation’. The project focuses on the areas of RIS3 smart specialisation, including:- Smart materials, technologies and engineering systems,- Information and communication technologies (ICT).The project addresses the following Latvian RIS3 growth priorities:1) Increase energy efficiency, including the development of new materials, optimization of the production process, introduction of new technologies, use of alternative energy sources and other solutions.2) Development of modern information and communication technologies (ICT) for the private and public sector.3) Development of knowledge base and human capital in knowledge areas where Latvia has comparative advantages and which are important for the economic transformation process, including RIS3 specialization and ICT core technologies.The expected contribution of the project to the achievement of RIS3 objectives includes:1) Involvement of new master students/doctorates in the project and involvement in the work at RTU. It is planned to involve 3 students (2-RTU, 1-RedFrog and create at least 1 new job.2) Increasing the number of young scientists who have developed their competences in the implementation of the project, including career development and renewal of scientific personnel (at least one scientist).3) Increasing Latvia's innovation capacity in communications, signal processing, acoustics and data fusion, providing a guide for further research and practical applications of high-precision cyber-physical indoor location infrastructure;.4) Increasing the number of scientific publications indexed in international databases (Scopus and WoS). 6 publications are planned (3- Q1/Q2 in magazines,