一种离散谱掩护信号波形设计与生成方法

Discrete Spectrum cover Signal Waveform Design and Generation Method

射频掩护是最早的雷达主动抗干扰措施之一,其通过在雷达脉冲信号之前发射不同频率的掩护脉冲来诱导敌方干扰机,实现抗干扰。近年来,随着抗干扰需求更加迫切,射频掩护技术进一步发展,最具代表性的是采用非连续谱信号作为掩护信号,但掩护信号的能量利用率仍存在提升空间。针对此问题,该文在非连续谱掩护信号基础上提出了一种离散谱掩护信号,建立了恒模和频谱幅度联合约束下的波形设计优化问题,通过交替向量乘子法以及频谱塑形算法求解,生成频谱离散、能量聚集的掩护信号。仿真结果表明,在能量和带宽相同的情况下,离散谱掩护信号相比于非连续谱掩护信号具有更高的频谱幅度,提升5~12 dB;在能量相同,频谱幅度接近的情况下,离散谱掩护信号能覆盖更大的频谱范围,实现了更好的抗干扰掩护效果。

Radio Frequency-screen is one of the earliest radar active antijamming measures.It achieves antijamming by transmitting cover pulses of different frequencies before the radar pulse signal to induce enemy jammers.As the demand for antijamming measures has become increasingly urgent in recent years,Radio Frequency-screen technology has been further developed.The most representative is the use of discontinuous spectrum signals as a cover signal.However,energy utilization for sending the cover signal can be improved further.To address this problem,this paper proposes a discrete spectrum cover signal based on the discontinuous spectrum cover signal and establishes the waveform design function under the joint constraint of constant modulus and spectral amplitude.The cover signal with discrete spectrum and energy aggregation is generated using the Alternating Direction Method of Multipliers(ADMM)and spectrum shaping algorithm solution.The simulation results show that the discrete spectrum cover signal has a higher spectral amplitude of approximately 5~12 dB than the discontinuous-spectrum cover signal for the same energy and bandwidth.Moreover,the discrete spectrum cover signal can cover a larger spectral range with the same energy and close spectral amplitude,realizing a better antijamming cover effect.