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The use of modern software-defined radio (SDR) devices enables theimplementation of efficient communication systems in numerous scenarios. Suchtechnology comes especially handy in the context of search and rescue (SAR)systems, enabling the incorporation of additional communication datatransmission into the otherwise sub-optimally used SAR bands at 121.5 and243~MHz. In this work, we propose a novel low-complexity, energy-efficientmodulation scheme that allows transmission of additional data within chirpedhoming signals, while still meeting the standards of international SAR systemssuch as COSPAS-SARSAT. The proposed method modulates information onto smalldeviations of the chirp slope with respect to the required unmodulated chirp,which can be easily detected at the receiver side using digital signalprocessing.

Fractional Chirp-Slope-Shift-Keying for SDR-based Search and Rescue Applications