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

被引：84

作者：

Levanon, N ^{[1
]}

Mozeson, E ^{[1
]}

机构：

[1] Tel Aviv Univ, Dept Elect & Syst Engn, IL-69978 Tel Aviv, Israel

来源：

IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS | 2003年 / 39卷 / 02期

关键词：

D O I：

10.1109/TAES.2003.1207275

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

An effective way to increase the bandwidth of a coherent pulse-train is to add a frequency step Deltaf between consecutive pulses. A large Deltaf implies a large total bandwidth, hence improved range resolution. However, when the product of the frequency step times the pulse-duration t(P), is larger than one (t(P) Deltaf > 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 Deltaf, B, and t(P) that will place nulls exactly where the grating lobes are located, and thus remove them completely.

引用

页码：694 / 703

页数：10