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In this paper, the physical layer security of a dual-hop unmanned aerialvehicle-based wireless network, subject to imperfect channel state information(CSI) and mobility effects, is analyzed. Specifically, a source node $(S)$communicates with a destination node $(D)$ through a decode-and-forward relay$(R)$, in the presence of two wiretappers $\left(E_{1},E_{2}\right)$independently trying to compromise the two hops. Furthermore, the transmitnodes $\left(S,R\right) $ have a single transmit antenna, while the receivers$\left(R,D,E_{1},E_{2}\right) $ are equipped with multiple receive antennas.Based on the per-hop signal-to-noise ratios (SNRs) and correlated secrecycapacities' statistics, a closed-form expression for the secrecy interceptprobability (IP) metric is derived, in terms of key system parameters.Additionally, asymptotic expressions are revealed for two scenarios, namely (i)mobile nodes with imperfect CSI and (ii) static nodes with perfect CSI. Theresults show that a zero secrecy diversity order is manifested for the firstscenario, due to the presence of a ceiling value of the average SNR, while theIP drops linearly at high average SNR in the second one, where the achievablediversity order depends on the fading parameters and number of antennas of thelegitimate links/nodes. Furthermore, for static nodes, the system can becastigated by a $15$ dB secrecy loss at IP$=3\times10^{-3},$ when the CSIimperfection power raises from $0$ to $10^{-3}$. Lastly, the higher thelegitimate nodes' speed, carrier frequency, delay, and/or relay's decodingthreshold SNR, the worse is the system's secrecy. Monte Carlo simulationsendorse the derived analytical results.

On the Physical Layer Security of a Dual-Hop UAV-based Network in the Presence of per-hop Eavesdropping and Imperfect CSI