Research On Frequency Planning Methods Of Multi-UAV Systems

With the rapid development of electronic technology and wireless communication,UAV formation combat platform has received more and more attention.Because of the characteristics of low energy consumption,easy deployment and high mobility,modern UAV combat system is widely used in the fields of military investigation,air supply,fire guidance,electronic countermeasures,battlefield situation assessment.However,in a wireless communication system,the frequency planning of multi-UAV systems faces many challenges due to the scarce spectrum resources,the limited UAV power consumption and the serious channel fading.To overcome the existing problems in the frequency planning of multi-UAV systems such as the difficulty in identifying control signals,the poor robustness of sensing equipment,the slow response of decision-making mechanism and the lack of adaptive ability,this paper studies frequency planning methods for the communication system of a UAV combat platform.The specific research work can be summarized as follows:(1)Design of the control signal for the uplink of a UAV formation based on quality of service:In order to solve the problem of low SINR of the control signals in UAV uplink communication system,this paper establishes the UAV uplink frequency planning model with Max-Min fairness,aiming to improve the overall received signal-to-noise ratio of the UAV formation.Then,this paper designs the uplink frequency strategy based on the block coordinate descent algorithm and the gradient projection algorithm.Simulation results show that the proposed scheme improves the quality of the received control signal of the formation and realizes a reasonable allocation of spectrum resources on the premise of ensuring the maximum transmission power constraint of the base station.(2)Design of UAV downlink communication system based on maximizing the transmission signal rate:To overcome the shortage of authorized spectrum,the serious radio radiation interference,and the limited airborne power in the downlink communication system,this paper establishes a frequency planning model based on the UAV downlink communication system to address the problem of low transmission rate in a UAV downlink communication system.Then,the problem is transformed into a maximum assignment problem with "more events than people",and the Hungarian algorithm is used to solve the above problem.Simulation results show that the proposed method can improve the transmission rate of the system on the premise of ensuring the maximum transmission power constraint of each UAV.This paper makes a detailed analysis of the UAV formation uplink and downlink communication system.The frequency decision-making scheme proposed in this paper guarantees the priority of UAV’s frequency use,improves the transmission rate of multi-UAV network system,increases the anti-interference performance of fleet,and provides a new idea for the frequency strategy related issues of UAV combat platform.