基于循环前缀的线性调频信号抗干扰探测波形设计方法

Design Method of Anti-interference Detection Waveform for Linear Frequency Modulation Signal Based on Cyclic Prefix

切片干扰兼具压制和欺骗干扰的特点,给雷达目标检测带来巨大挑战。针对这一问题,提出了一种基于循环前缀(CP)的线性调频信号设计与处理方法。首先,建立抗干扰探测波形和切片干扰的信号模型,接着利用基于CP的脉冲压缩算法实现目标距离向估计。然后,在恒模条件下,建立了以最大化脉压输出信干噪比为目标的优化问题模型,由于该优化问题是一个NP难问题,文中提出了包络约束-共轭梯度算法获取近似解。最后,通过仿真结果证明本文所提方法的有效性。

Slice interference has the characteristics of both suppression and deception interference,posing a huge challenge to radar target detection.In response to this issue,a method is proposed for designing and processing linear frequency modulation(LFM)signals based on cyclic prefix(CP).Firstly,a signal model is established for anti-interference detection waveform and slice interference,and a pulse compression algorithm is used based on CP to achieve target range estimation.Then,under constant modulus conditions,an optimization problem model is established with the goal of maximizing the signal to interference plus noise ratio(SINR)of pulse compression output.Due to the NP-hard nature of the optimization problem,an envelope constrained conjugate gradient algorithm is proposed to obtain an approximate solution.Finally,the effectiveness of the proposed method is demonstrated through simulation results.