认知雷达二维自适应抗干扰捷变波形设计

Adaptive Anti-Jamming Design for Two-Dimensional Waveform Agility in Cognitive Radar System

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二维自适应抗干扰捷变波形设计方法。首先从模糊函数角度出发,研究发射端抗干扰二维调制优化准则和数学模型。其次设计降维策略,将复杂的高维优化问题拆解为多个低维度子优化问题。接着采用Lagrange乘子法及交替迭代法对模型进行求解,达到二维调制下抑制干扰及旁瓣的效果。最后通过仿真验证算法的可行性。仿真结果表明,所提算法能够从二维的角度对干扰信号进行抑制,提高了雷达系统的自由度。

A new adaptive anti-jamming design for two-dimensional waveform agility is proposed in this paper according to the environment sensing characteristics of cognitive radar.Firstly,from the perspective of ambiguity function,the two-dimensional modulation optimization criterion and the mathematical model for anti-jamming at the transmitter are studied.Secondly,a dimensionality reduction strategy is designed to disassemble the complex high-dimensional optimization problem into multiple low-dimensional sub-optimization problems.Then the Lagrange multiplier method and the alternating iterative method are used to solve the model to achieve jamming rejection and sidelobe suppression in the two-dimensional modulation.Finally,the effectiveness of the proposed algorithm is verified by computer simulations.The results show that the proposed algorithm can reject jamming in two-dimensional modulation and raise the system’s degree of freedom.