Air-ground channel characterization for unmanned aircraft systems: The mountainous environment

● Accurate AG channel models important to UAS - Dual-band, SIMO AG channel measurements ● Mountainous flight tests → large database for modeling path loss, fading, dispersion, correlations - Log-distance model for path loss - K-factors ∼14 dB in L-band & 29.5 dB in C-band - Avg RMS-DS 10 ns w/max 174 ns - Channels in two bands uncorrelated - Channels in same band highly correlated