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作业四 | ||
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用切割的概念来理解模糊函数的物理意义。 | ||
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用$\tau = \tau_{0..n}$切割,物理意义是一个信号经过一组匹配滤波器的输出响应; | ||
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用$\xi = \xi_{0..n}$切割,物理意义是一组信号经过一个匹配滤波器的输出响应的时间倒置; | ||
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模糊图解释窄脉冲信号不能测速,而连续波信号能够测速。 | ||
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窄脉冲信号的模糊图主峰沿时沿轴方向,在多普勒轴较短,多普勒不敏感。 | ||
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连续波信号的模糊图沿多普勒轴方向,在多普勒轴较长,多普勒不敏感。 | ||
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同一信号改变参量和不同信号形式的模糊图体积分布变化是否相同? | ||
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总体积不变,体积分布于信号波形或频谱有关,会不相同。 |
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作业五 | ||
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用模糊图的切割来理解 LFM 信号是多普勒不敏感信号。 | ||
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用$\xi = \xi_0$的平面切割 LFM 信号的模糊图,随着$\xi_0$增加,脉冲峰值下降不明 | ||
显,多普勒不敏感。 | ||
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如果目标 A 与 B 的距离相同,但速度不同,那么这两个目标能否分辨? | ||
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能。因为 LFM 信号是斜刀刃,测量值是速度和距离的组合值。 | ||
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处在斜刀刃上的目标能否分辨?为什么? | ||
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不能。因为斜刀刃上的目标的匹配滤波器响应会相互重叠。 |