GNSS-Based Non-Cooperative Air Traffic Situational Awareness

Kurzfassung

In this work, an initial feasibility assessment of a global navigation satellite system-based passive multistatic radar approach aimed at enabling non-cooperative air traffic situational awareness is performed. First, the bistatic case is studied, where the acheivable theoretical detection performance study shows the need for a long integration time. The range and Doppler migration compensation approach needed to enable a high processing gain when using a long integration time in practice is therefore addressed and a multi-frame hybrid integration technique proposed. This target migration compensation approach merges both state-of-the-art single frame and multi-frame long integration techniques to enable long integration time processing for the air-to-air scenario of interest. More specifically, it corrects for the intra- and inter-frame range and Doppler migration components while allowing for different accelerations in each frame, inherently accounting for a geometry induced relative jerk. Preliminary simulation results show the effectiveness of the proposed approach. Building on this bistatic processing approach, the multistatic case is addressed. A reference domain for combining the bistatic results is defined and the transformation between domains is implemented such that to allow for the multistatic processing. Simulation results employing several satellites confirm the successful transformation and multistatic combination in the noise-free case. For the case with noise, the transformatio is shown to give rise to some noise enhancement artifacts for specific geometries and remains the topic of future work.