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.
Nullifying ACF grating lobes in stepped-frequency train of LFM pulses
IEEE Transactions on Aerospace and Electronic Systems ; 39 , 2 ; 694-703
2003-04-01
799267 byte
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Nullifying ACF Grating Lobes in Stepped-Frequency Train of LFM Pulses
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