基于OFDM的合成孔径雷达距离模糊抑制

Range Ambiguity Suppression of SAR Based on OFDM

距离模糊问题是合成孔径雷达成像面临的重要挑战,为了解决该问题,并同时确保多普勒无模糊,提出了一种正交频分复用波形设计方法。该方法通过在每个发射波形上调制独立的随机相位编码,在接收端利用匹配滤波器组实现对距离模糊的抑制和宽幅成像。此外,理论分析表明,所提方法不会造成距离分辨率的下降,且具有优异的最大相对互模糊特性。最后,仿真实验验证了所提方法的有效性。

For synthetic aperture radar（SAR）imaging,range ambiguity is a crucial challenge.To solve the range ambiguity and guarantee the Doppler is unambiguous,an orthogonal frequency division multiplexing（OFDM）waveform design method is proposed in this paper.For this method,independent random phase coding is modulated on each transmitted waveform,and matched filter group is used to realize the range ambiguity suppression and wide swath imaging at the receiving port.Moreover,theoretical analysis shows that the proposed method will not cause the degradation of range resolution and can achieve favorable maximum relative cross ambiguity value.Finally,simulation experiments are presented to verify the effectiveness of the proposed method.