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Piecewise LFM waveform for MIMO radar

机译：MIMO雷达的分段LFM波形

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摘要

To separate the received signals in a multiple-input multiple-output (MIMO) radar, the transmitted signals should be orthogonal or have a low cross-correlation level. Some other properties, such as low autocorrelation sidelobes, high range resolution, and good Doppler tolerance are also desired. However, they are difficult to achieve simultaneously. In general, an improved criterion is at the cost of another degraded one. In this paper, we propose a piecewise linear frequency modulation (PLFM) waveform for the MIMO radar. The transmitted signals are pulse trains, including diversified subpulses, which are divided into three segments with controllable durations and bandwidths. The duration sequence of the second segment is obtained by the genetic algorithm to optimize the cross correlation. Theoretical analyses and numerical results are presented to illustrate the properties of the proposed PLFM waveform. Compared with the polyphase coding and the discrete frequency coding waveforms, the PLFM waveform has a lower cross-correlation level and higher degrees of freedom. The relationship of the bandwidths among different segments can be used to adjust the sidelobe peak and the main lobe width of the autocorrelation function.
机译：为了在多输入多输出（MIMO）雷达中分离接收到的信号，传输的信号应正交或具有低互相关级别。还需要其他一些属性，例如低自相关旁瓣，高范围分辨率和良好的多普勒容限。但是，它们很难同时实现。通常，一个改进的标准是以另一个降级的标准为代价的。在本文中，我们为MIMO雷达提出了分段线性调频（PLFM）波形。传输的信号是脉冲序列，包括多样化的子脉冲，这些脉冲分为可控制的持续时间和带宽，分为三个部分。通过遗传算法获得第二段的持续时间序列，以优化互相关。理论分析和数值结果表明了所提出的PLFM波形的特性。与多相编码和离散频率编码波形相比，PLFM波形具有较低的互相关级别和较高的自由度。不同段之间的带宽关系可以用来调整旁瓣峰值和自相关函数的主瓣宽度。

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