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Frequency Diverse MIMO Techniques for Radar

机译：雷达的频分MIMO技术

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It has been shown over several decades of radar research that the exploitation of diversity in a number of domains (space, frequency, time, polarization, and, recently, waveform) can provide increased agility, flexibility, robustness, and capabilities to the radar system. However this is often achieved either through efforts in system design, increased hardware complexity, or by employing additional resources. A conventional antenna array is considered with the intention of introducing, not major, but minor mismatches, in particular in the carrier frequencies and, eventually in the codes at the element level. The starting point of this analysis is the frequency diverse array (FDA), which has been demonstrated to generate a range-angle pattern. Through a reconsideration of the organization of the array, which we have termed the wavelength array (WA), a new pattern, "orthogonal" to that of the standard phased array, can be achieved. The bistatic combination of a WA and a receiver leads to the frequency diverse bistatic system (FDBS), which can be a significant application of this concept. In a second stage the analysis focuses on the effects of introducing waveform diversity in such a system. In particular, if the elements of an electronically steered array (ESA) simultaneously transmit a number of pseudonoise (PN) codes at slightly different carrier frequencies, the coherent summation of the codes gives rise to a waveform whose shape is a function of both angle and range. In fact this is the consequence of applying the multiple-input multiple-output (MIMO) technique to the FDA, which has the result of associating a waveform to each point range/angle of the space, with the possibility of recovering this information in receive after appropriate processing.
机译：几十年来的雷达研究表明，在许多领域（空间，频率，时间，极化和最近的波形）中利用分集可以为雷达系统提供更高的敏捷性，灵活性，鲁棒性和功能。 。但是，这通常是通过系统设计上的努力，增加的硬件复杂性或通过使用其他资源来实现的。考虑了常规天线阵列，其目的不是引入主要而是较小的失配，特别是在载波频率中并且最终在元件级的码中引入。该分析的起点是频率分集阵列（FDA），已证明它可以产生范围角模式。通过重新考虑我们称为波长阵列（WA）的阵列的组织，可以实现一种与标准相控阵列“正交”的新图案。 WA和接收器的双基地组合导致了频率变化双基地系统（FDBS），这可能是该概念的重要应用。在第二阶段，分析着重于在这种系统中引入波形分集的效果。特别是，如果电子控制阵列（ESA）的元件以略微不同的载波频率同时发送多个伪噪声（PN）码，则这些码的相干求和会产生一个波形，其形状是角度和角度的函数。范围。实际上，这是将多输入多输出（MIMO）技术应用于FDA的结果，该技术的结果是将波形与空间的每个点范围/角度相关联，并有可能在接收时恢复此信息。经过适当的处理。

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