A new multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) configuration using multiple contiguous azimuth beams is proposed to map wider image swaths with higher cross-range resolution as compared with the conventional MIMO-SAR. The proposed configuration is independent of the orthogonal waveforms used for transmission and it allows the use of all the phase centers including the overlapping ones to reduce the minimum operating pulse repetition frequency that should be satisfied to avoid aliasing in the azimuth dimension unlike the case of the conventional MIMO-SAR in which only the nonoverlapped phase centers and one of each overlapped phase centers are utilized. This is the result of employing multiple contiguous azimuth beams which makes the echoes, whose effective phase centers are overlapped, occupy different Doppler bandwidths. Each transmitted waveform consists of a sequence of subpulses such that each subpulse is a conventional linear frequency modulated waveform. Echoes corresponding to different phase centers at a given receiver are separated using digital beamforming on receive in elevation. The estimated range profile is free from interrange cell interference as frequency domain system identification-based estimation algorithm is used to identify the impulse response in the range dimension. Finally, both simulated and constructed raw data are used to validate the efficiency of the proposed algorithm.

中文翻译：

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超高分辨率宽幅 MIMO SAR

提出了一种新的多输入多输出 (MIMO) 合成孔径雷达 (SAR) 配置，它使用多个连续的方位角波束，以与传统的 MIMO-SAR 相比，以更高的横向分辨率映射更宽的图像带。建议的配置独立于用于传输的正交波形，它允许使用所有相位中心，包括重叠的相位中心，以减少应该满足的最小操作脉冲重复频率，以避免在方位维度上出现混叠，这与传统的 MIMO-SAR，其中仅使用非重叠相位中心和每个重叠相位中心之一。这是采用多个连续方位波束的结果，使得有效相位中心重叠的回波，占用不同的多普勒带宽。每个传输的波形由一系列子脉冲组成，这样每个子脉冲都是传统的线性频率调制波形。在给定接收器处对应于不同相位中心的回波在仰角接收时使用数字波束成形进行分离。由于使用基于频域系统识别的估计算法来识别距离维度中的脉冲响应，因此估计的距离分布不受区间小区干扰。最后，模拟和构造的原始数据都用于验证所提出算法的效率。在给定接收器处对应于不同相位中心的回波在仰角接收时使用数字波束成形进行分离。由于使用基于频域系统识别的估计算法来识别距离维度中的脉冲响应，因此估计的距离分布不受区间小区干扰。最后，模拟和构造的原始数据都用于验证所提出算法的效率。在给定接收器处对应于不同相位中心的回波在仰角接收时使用数字波束成形进行分离。由于使用基于频域系统识别的估计算法来识别距离维度中的脉冲响应，因此估计的距离分布不受区间小区干扰。最后，模拟和构造的原始数据都用于验证所提出算法的效率。