An effective way to increase the bandwidth of a coherent pulse-train is to add a frequency step /spl Delta/f between consecutive pulses. A large /spl Delta/f implies a large total bandwidth, hence improved range resolution. However, when the product of the frequency step times the pulse-duration t/sub p/, is larger than one (t/sub p/ /spl Delta/f > 1), the autocorrelation function (ACF) of the stepped-frequency pulse-train suffers from ambiguous peaks, known as "grating lobes." It is well known that replacing the fixed-frequency pulses with linear FM (LFM) pulses of bandwidth B can reduce those grating lobes. We present a simple analytic expression for the ambiguity function (AF) and ACF of such a signal and derive from it very simple relationships between /spl Delta/f, B, and t/sub p/ that will place nulls exactly where the grating lobes are located, and thus remove them completely.


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    Title :

    Nullifying ACF grating lobes in stepped-frequency train of LFM pulses


    Contributors:
    Levanon, N. (author) / Mozeson, E. (author)


    Publication date :

    2003-04-01


    Size :

    799267 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English