Research On Power Allocation Methods For Integrated Radar And Communications System

Due to limited spectrum resources,the contradiction between various radio systems has become increasingly serious,so the integrated radar and communication system has received extensive attention.Theoretically,the more resources the system occupies,the better its comprehensive performance.However,in practical applications,its resources are limited,and there is mutual influence between radar performance and communication performance.In order to improve the survivability of various platforms on the battlefield,while ensuring radar and communication performance,it is necessary to improve the low interception performance of the integrated system.Therefore,this thesis conducts in-depth research on the power resource allocation of the system,with the specific content as follows:1.Considering the problem of power resource allocation for task priority in integrated radar and communication system,a power allocation algorithm in the case of radar communication spectrum multiplexing is proposed.Firstly,the signal model of radar communication integration is established.Secondly,the mutual information is taken as the index to measure the radar detection performance,and the bandwidth adjustment factor is introduced.Under the constraint of limited power,the optimization models considering maximizing mutual information and communication transmission rate are respectively constructed for the two multiplexing modes of communication based and radar based.Finally,combined with the Karush-Kuhn-Tucker condition,the block coordinate descent is used to optimize the optimization objectives.The simulation results show that the proposed power allocation algorithm,compared with the comparison algorithm,can effectively improve the overall performance of the system.2.Considering the problem of power resource allocation for low probability of intercept in integrated radar and communication system,a joint algorithm combining relaxation and interior point method is proposed in this thesis.Firstly,the signal model of integration of radar and communication is established.Then the optimization model of transmission power is designed with the constraints of radar detection probability,communication transmission rate and peak power.For the constructed optimization model,the inequality constraints of communication transmission rate and radar detection probability are rewritten into equality constraints.On the basis of meeting the requirements of radar performance and communication performance,the relationship model between peak power,channel conditions and system performance constraints is established.Finally,the interior point method is used to set the values of the constrained communication transmission rate and radar detection probability,thereby solving the problem of radar and communication transmission power allocation.The simulation results show that the proposed method significantly reduces the total power of signal transmission,thereby improving the low interception performance of the system.3.Considering the problem of joint subcarrier and power allocation for low probability of intercept in integrated radar and communication system,under the constraints of the signal to noise ratio of the radar and the communication transmission rate,a mixed integer nonlinear optimization model is constructed,and a joint subcarrier and power allocation method is proposed to minimize the total transmission power of the system.Firstly,the optimization model is converted into a linear model,and the optimization model is simplified by adding penalty factors.The subcarriers of radar or communication are reasonably selected.Based on the differences between radar performance and communication performance evaluation standards,different transmission power constraints are set for them,and finally the joint allocation of subcarriers and power is achieved through cyclic optimization.The simulation results show that the algorithm proposed in this thesis has better low interception performance.