Direction finding of radio sources

This video presents the design and findings of a Radio Direction Finding (RDF) system used to find the Angle of Arrival (AOA). Phase Interferometry, which uses the phase difference between antennas and trigonometry to calculate the AOA, is the implemented method. It is chosen due to its accuracy and usage of only two antennas. The system is limited to a range between -90 :90 degrees. Two monopole antennas, which retrieve frequencies between 80-100 MHz, are implemented to extract the desired radio signals. The USRP1 in combination with GNU Radio are used to perform the signal conditioning, thereby isolating the desired frequency from noise and interference. The signal processing is performed in Python to calculate the AOA. The system has a 6.83% error with a 12.4-degree deviation from the desired angle. It is however noted that in the range of -60:60 degrees, the average deviation is 6-degrees which multiplies by a factor of approximately 4 to a deviation of 26.5 degrees in the range -90:-75 and 75:90 degrees. This is because there is a non-linear relationship between the electronic and mechanical angle. Post processing statistical methods such as the Maximum Likelihood (ML) Method or Eigenspace Methods and or introducing a third antenna to the system can improve accuracy significantly and increase the range of the system to 360-degrees.
Student names:
Sheena Philip and Erlé Minnaar
Supervisor name:
Prof Jaco Versfeld

[@Gabriel-iy1zq]

Great Video! I was interested in the python code used. Specifically, what modules does Python have for these type of tasks? Analyzing the signals, calculating AoA, and Distance from source