SiFu: Generic Signal Fusion for Multi-modal Localization


A novel technology on signal fusion of GPS, Wi-Fi, BLE, Magnetic and INS for indoor/outdoor positioning system, which can significantly decrease the localization error down by 30%. The solution is suitable for wide-range and dynamic scenario where single type of signal is not always stable or available.

  • SiFu: Generic Signal Fusion for Multi-modal Localization
Commercialisation opportunities
Technology licensing agreement
Problem addressed

The framework supports dynamic set of signals in terms of type and number, enable seamless roaming over a wide range of signal environment.

  • Various signals such as GPS, Wi-Fi, BLE, geomagnetism and INS, all have their own strengths and limitations. Using a generic likelihood computation module, signal value is converted to location likelihood on pre-defined grid points in the feasible area of the map.
Key impact
  • Complement to the strength and weakness of multiple signals
  • Improve localization error down by 30%
  • Ubiquitous for dynamic indoor-outdoor environment
  • Retrofit to existing signal infrastructure and low cost IoT devices
  • Retails – wayfinding, customer journey analysis
  • Healthcare– track of elderly or dementia patients
  • Warehouse – asset or vehicle tracking


  • USPTO US Granted Patent: Application # 17/344998
  • CNIPA Chinese Patent Application 202110755841.3
The Hong Kong University of Science and Technology (HKUST)

The Hong Kong University of Science and Technology (HKUST) ( is a world-class research intensive university that focuses on science, technology and business as well as humanities and social science. HKUST offers an international campus, and a holistic and interdisciplinary pedagogy to nurture well-rounded graduates with global vision, a strong entrepreneurial spirit and innovative thinking. Over 80% of our research work were rated “Internationally excellent” or “world leading” in the Research Assessment Exercise 2020 of Hong Kong’s University Grants Committee. We were ranked 3rd in Times Higher Education’s Young University Rankings 2022, and our graduates were ranked 23rd worldwide and among the best from universities from Asia in Global University Employability Survey 2021.