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27 May 2022 Performance evaluation and field trial of chirp spread spectrum waveform for low probability of intercept applications
Bijan G. Mobasseri, Khanh Pham
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Proceedings Volume 12108, Radar Sensor Technology XXVI; 1210802 (2022) https://doi.org/10.1117/12.2618445
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States
Abstract
In a recent work,1 chirp spread spectrum(CSS) was proposed as a low probability of intercept(LPI) waveform. CSS has been previously proposed for low power IoT applications and adopted in the LoRa standard. However, the LPI use of the waveform was new. The key in adopting CSS for LPI applications is the use of waveforms with a large time-bandwidth product. The pulse compression gain available to the intended receiver is not available to the intercept receiver. This report builds upon the previous work by testing the waveform in a 15 mile terrestrial link from atop Sandia Crest to points west. The transmit power level is swept from +27 dBm to -33 dBm. The intended receiver uses channelized matched processing whereas the intercept receiver deploys a wideband radiometer. The experiment measured the minimum transmit power level and maximum intercept range to keep the signal under the intercept receiver noise floor and yet detectable by the intended receiver.
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Bijan G. Mobasseri and Khanh Pham "Performance evaluation and field trial of chirp spread spectrum waveform for low probability of intercept applications", Proc. SPIE 12108, Radar Sensor Technology XXVI, 1210802 (27 May 2022); https://doi.org/10.1117/12.2618445
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KEYWORDS
Radiometry
Signal to noise ratio
Signal detection
Sensors
Interference (communication)
Signal processing
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