TY - JOUR
T1 - Nullifying ACF grating lobes in stepped-frequency train of LFM pulses
AU - Levanon, Nadav
AU - Mozeson, Eli
PY - 2003/4
Y1 - 2003/4
N2 - An effective way to increase the bandwidth of a coherent pulse-train is to add a frequency step Δf between consecutive pulses. A large Δf implies a large total bandwidth, hence improved range resolution. However, when the product of the frequency step times the pulse-duration tp, is larger than one (tpΔf > 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 Δf, B, and tp that will place nulls exactly where the grating lobes are located, and thus remove them completely.
AB - An effective way to increase the bandwidth of a coherent pulse-train is to add a frequency step Δf between consecutive pulses. A large Δf implies a large total bandwidth, hence improved range resolution. However, when the product of the frequency step times the pulse-duration tp, is larger than one (tpΔf > 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 Δf, B, and tp that will place nulls exactly where the grating lobes are located, and thus remove them completely.
UR - http://www.scopus.com/inward/record.url?scp=0043198194&partnerID=8YFLogxK
U2 - 10.1109/TAES.2003.1207275
DO - 10.1109/TAES.2003.1207275
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AN - SCOPUS:0043198194
SN - 0018-9251
VL - 39
SP - 694
EP - 703
JO - IEEE Transactions on Aerospace and Electronic Systems
JF - IEEE Transactions on Aerospace and Electronic Systems
IS - 2
ER -