Satellite-based automatic dependent surveillance broadcast (ADS-B) is considered as suitable technology for the next generation air traffic management, which offers the opportunity of real-time aircraft surveillance even in remote areas where ground stations cannot be installed. For a correct reception of the ADS-B message, the receiver must preliminarily detect the packet preamble. This task may be particularly critical in space-borne applications, where the transmitted signal experiences high path attenuation before reaching the receiver. Existing methods for preamble detection are mostly based on heuristic reasoning and work poorly in a low signal-to-noise ratio (SNR) scenario. This motivates the search for an improved scheme obeying to some optimality criterion that can operate successfully in a satellite-based ADS-B system. In this work, we use the generalized likelihood ratio test (GLRT) criterion to develop a novel algorithm for reliable detection of the ADS-B message. Its peculiar feature is that, in addition to the packet preamble, also a part of the subsequent data block can be embedded in the detection process. Computer simulations indicate that the proposed scheme outperforms existing alternatives and is tolerant to residual frequency errors.
GLRT preamble detection for satellite ADS-B
01.01.2023
823188 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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