正交波形虚拟孔径MIMO雷达原理与性能讨论

Principle and performance discussion on orthogonal waveform virtual aperture MIMO radar

多输入多输出(multiple input multiple output,MIMO)雷达可在接收端形成奈奎斯特虚拟阵列,大大扩展了接收阵列的有效孔径。文章讨论了在发射或接收阵列稀疏布阵的情况下,虚拟孔径MIMO雷达的测角精度和抗干扰性能。分析表明,得益于奈奎斯特虚拟孔径的形成,MIMO雷达可获得比传统相控阵雷达更窄的有效接收波束宽度和更高的测角精度。对于转发干扰,较窄的接收波束宽度也使虚拟孔径MIMO雷达更容易规避主瓣干扰。而对于非转发的压制干扰,MIMO雷达具有与相控阵一致的抗干扰性能。此外,文章还讨论了将线性调频连续波(linear frequency modulated continuous wave,LFMCW)信号与虚拟孔径MIMO雷达相结合的可行性和性能优势。

Multiple input multiple output （MIMO） radar is able to form the Nyquist virtual array at the receiving end, expanding the effective aperture of the radar system. The angular measurement accuracy and the jamming suppression performance of the virtual aperture MIMO radar are discussed, when the transmit or receive array is set to be sparse. Analysis shows that, thanks to the formation of the Nyquist virtual array, the MIMO radar can obtain narrower beamwidth and higher angular measurement accuracy when compared with the conventional phased array radar. When inflicted with repeater jamming, narrower beam makes it easier for the virtual aperture MIMO radar to circumvent mainlobe interference. As to blanket jamming, MIMO radars have the same jamming suppression performance with the conventional phased array radar. In addition, the engineering realizabilities and performance advantages of combining the virtual aperture MIMO radar with the linear frequency modulated continuous wave （LFMCW） signal are discussed.