Software-defined radios (SDRs) provide a quick way to modify a device’s communication frequency, modulation, and functionality. This flexibility makes them a preferred choice for transceivers that require fast modification. This paper employs the SDR platform to create low-probability detection (LPD) links and build a clandestine network for operation in strong interference environments. Specifically, we develop a network with no common timing source between the transmitter and receiver. Previous research (D. R. Taylor, J. Walker, and B. Strunz, “Direct Sequence Spread Spectrum Experiments using GNU Radio Companion SDR,” in 2021 15th International Conference on Advanced Technologies, Systems and Services in Telecommunications, TELSIKS 2021 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2021, pp. 41–44) implemented LPD, non-coherent networks through SDRs, using only binary phase-shift keying (BPSK) and continuous streaming. This limits the amount of data sent, and even more importantly, the constant streaming makes the link easier to detect.
