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长时间相干积累方法Radon-Fourier变换(RFT)中盲速旁瓣(BSSL)现象会导致雷达虚警增加、目标检测性能降低。针对BSSL问题,给出了一种基于多输入多输出(MIMO)雷达多载频设计的BSSL抑制方法。首先根据载频与BSSL分布的关系,详细推导了BSSL不交叠的约束条件;然后基于该约束条件给出了具体的载频设计公式。利用设计的载频可得到具有不交叠BSSL的两个RFT输出,通过联合处理这两个RFT输出,可实现BSSL抑制。给出了BSSL抑制性能的评价方法。理论分析和数值实验结果表明,本文算法能够在不降低RFT相干积累性能的同时,有效实现BSSL抑制。
Long-term Coherent Accumulation Blind velocity sidelobe (BSSL) phenomena in Radon-Fourier Transform (RFT) can lead to increased false alarm and lower target detection performance. Aiming at the problem of BSSL, a BSSL suppression method based on multi-input multiple output (MIMO) radar multi-carrier design is given. First, according to the relationship between carrier frequency and BSSL distribution, the constraint that BSSL does not overlap is deduced in detail. Then the concrete carrier frequency design formula is given based on the constraint. Using the designed carrier frequency, two RFT outputs with non-overlapping BSSL are available and BSSL rejection can be achieved by jointly processing the two RFT outputs. The evaluation method of BSSL suppression performance is given. Theoretical analysis and numerical experiments show that the proposed algorithm can effectively suppress BSSL without reducing the coherent accumulation of RFT.