The invention discloses a low-altitude intelligent car networking energy efficiency and safety rate joint optimization method and
system, and belongs to the technical field of car networking communication. The method comprises the following steps: constructing an air-ground integrated
cooperation model comprising a far-end
base station, an unmanned aerial vehicle
relay and multiple vehicles, depicting fast time-varying characteristics based on a geometric random channel model, and constructing a
secure communication model according to the Shannon
confidentiality theorem, a multi-constraint
optimization problem with the sum of the minimum
total energy consumption of the unmanned aerial vehicle and the maximum
vehicle safety rate as the target is formed; designing an alternative optimization solution framework, and decoupling an original problem into three sub-problems of
base station transmitting
power control, unmanned aerial vehicle transmitting
power control and unmanned aerial vehicle track optimization; and in each iteration, other variables are fixed, the three sub-problems are solved by adopting a Newton iteration method, a
model prediction control method, a targeting method and a
gradient descent method in sequence, and the corresponding variables are updated until convergence. According to the method, the flight path and the communication power of the unmanned aerial vehicle are jointly optimized, so that the problem of cooperative improvement of safety communication and
system energy efficiency under a fast time-varying channel is effectively solved.