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The textbook is wrong, or very misleading depending on interpretation. The frequency response is square - or, constant over the swept frequency. Assuming an ideal chirp system which can scale up $f$ to any arbitrary duration $t$ (infinite bandwidth);, then the magnitude is a square of infinite width - which happens to be the same as plain "constant"...


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The book is not wrong, but it does present the concepts on LFM in a clunky manner and can be misleading. The book presents the analytical expression for the LFM spectrum, which is an approximation. It also plays with the plot views and most likely unwraps the phase angles, which is usually required to see the phases you expect. Usually when you're ...


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