  Jamming attacks on wireless networked control systems are investigated for
the scenarios where the system dynamics face exogenous disturbance. In
particular, the control input packets are assumed to be transmitted from a
controller to a remotely located linear plant over an insecure wireless
communication channel that is subject to jamming attacks. The time-varying
likelihood of transmission failures on this channel depends on the power of the
jamming interference signal emitted by an attacker. We show that jamming
attacks can prevent stability when the system faces disturbance, even if the
attacked system without disturbance is stable. We also show that stability
under jamming and disturbance can be achieved if the average jamming
interference power is restricted in a certain way that we characterize in the
paper. We illustrate our results on an example networked control system with a
fading wireless channel, where the outage probability is affected by jamming
attacks.
