Wideband / LPI Processing
RAS is engaged in a number of efforts to detect and measure key characteristics of Low Probability-of-Intercept (LPI) Signals-of-Interest (SOIs). Current ELINT digital receivers are limited by bandwidth constraints and confined to narrow channelizer bandwidths, making detection and identification of wideband emitters difficult or impossible. As technology improves to allow processing much wider bandwidth channels, the entire waveform can be identified, characterized more accurately, and summarized into a single descriptor word.
RAS has developed a number of techniques, including joint time-frequency algorithms, to exploit the phenomenology of LPI, wide bandwidth, or very narrow pulsewidth signals to enable their detection, measurement, and identification. RAS is continuing to refine these techniques on an ongoing AFRL program.