Passive Localization Systems - Spectrum Sensing

Status: abgeschlossen
Betreuer: Horst Hellbrück , Mathias Pelka
Student: Marco Cimdins


Classical indoor positioning systems require measurement of location depending parameters (e.g. time stamps or received signal strength) to determine the position of objects. High accuracy and precision is achieved with tag / anchor based positioning systems. However, not all circumstances allow such infrastructure and sometimes it is beneficial to employ signals of opportunity to locate objects. For instance, people wear smartphone which emits signals, which can be in return detected by measurements. In this research project, we investigate properties of opportunistic signals.


As a first step towards this goal, we modify hardware to not only detect received signals from known signals, e.g. Wi-Fi or Bluetooth, but for a good part of the electromagnetic spectrum. Our wireless sensor node is equipment with a radio device which is used to detect radio signals, therefore can act as a cheap spectrum sensor device. Via a serial port interface, collected data is transferred to a computer for further investigation.


  • Write code to sweep through the available radio channels of our wireless sensor node, determine the received signal strength and transfer data to a computer.
  • Visuallize data on the sensor node via display.
  • Documentation and evaluation of the work.


  • Knowledge of microcontrollers and radio chips is beneficial.
  • Knowledge of computer language, particular C is required.