A novel direction-finding method with time-modulated array (TMA) is proposed for modulating the echo linear frequency modulation (LFM) signal and analyzing its harmonic characteristics. Unlike conventional analysis method where each coefficient of harmonic components is analyzed by discrete Fourier transform, in the proposed method, the harmonic coefficients of modulated signals are calculated by using the pulse compression technology. After the modulated LFM signal is compressed by the matched filter, a closed-form expression of the corresponding output signal is derived and the harmonic coefficients of the input modulated signals can also be obtained. Meanwhile, in order to avoid being affected by other harmonic components in the process of analyzing each harmonic coefficient, the constraints to acquire independent harmonic coefficients are highlighted. Numerical simulations are provided to verify the performance of the proposed method, and a simple S-band eight-element TMA is constructed to experimentally verify its feasibility.

中文翻译：

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带脉冲压缩的时间调制阵列中线性调频信号的测向

提出了一种新的时间调制阵列（TMA）测向方法，用于调制回波线性频率调制（LFM）信号并分析其谐波特性。与传统的分析方法通过离散傅立叶变换分析谐波分量的每个系数不同，该方法利用脉冲压缩技术计算调制信号的谐波系数。调制LFM信号经过匹配滤波器压缩后，得到相应输出信号的闭式表达式，也可以得到输入调制信号的谐波系数。同时，为了避免在分析各个谐波系数的过程中受到其他谐波分量的影响，突出显示了获取独立谐波系数的约束。提供了数值模拟来验证所提出方法的性能，并构建了一个简单的 S 波段八元素 TMA 以实验验证其可行性。