认知雷达干扰和旁瓣均衡抑制的波形设计

摘要

针对认知雷达具备环境感知的特点,研究了基于干扰先验信息的认知雷达波形设计方法.首先在接收端旁瓣电平和干扰电平相等的约束条件下,根据最小均方误差(Minimum Mean Square Error,MMSE)准则设计了认知雷达波形设计的代价函数,接着利用交替指向法将优化问题进行分解,然后利用拉格朗日(Lagrange)乘子法引入多个辅助变量和KKT最优条件性进行求解,最后通过计算机仿真验证了算法的有效性.仿真结果表明,所提算法能够实现对干扰信号和自身处理旁瓣的均衡抑制,提高了雷达接收处理的动态范围.%In this paper,according to the environment sensing characteristics of cognitive radar,a new waveform optimization method based on priori interference information is proposed.Firstly,in the constraint of equality of sidelobes level and interference level in receiver,a cost function of waveform design in cognitive radar is designed according to the minimum mean square error (MMSE) principle.Then,the optimization problem is decomposed by alternating directionmethod and solved by introducing multiple auxiliary variables and the KKT optimal conditionality in Lagrange-muhiplier method.Finally,the effectiveness of the proposed algorithm is verified by computer simulations.The results show that the proposed algorithm can equally suppress interference and sidelobes in cognitive radar,as well as improve the dynamic range of the receiver.