Removing autocorrelation sidelobes by overlaying orthogonal coding on any train of identical pulses

Eli Mozeson*, Nadav Levanon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A coherent train of identical linear FM (LFM) pulses is used extensively in radar because of its good range and Doppler resolution. Its relatively high autocorrelation function (ACF) sidelobes are sometimes reduced through spectrum shaping (e.g., nonlinear FM, or intrapulse weighting on receive). We show how to completely remove most of the ACF sidelobes about the mainlobe peak, without any increase to the mainlobe width, by diversifying the pulses through overlaying them with orthonormal coding. A helpful byproduct of this design is reduced ACF recurrent lobes. The overlaid signal also results in reduced Doppler tolerance, which can be considered as a drawback for some applications. The method is applied to several trains of identical pulses (LFM and others) using several orthonormal codes. The effect on the three important properties of the radar signal: ACF, ambiguity function (AF), and frequency spectrum is presented. The effect on Doppler tolerance is studied, and implementation issues are discussed. The new design is also compared with complementary and subcomplementary pulse trains and is shown to be superior in many aspects.

Original languageEnglish
Pages (from-to)583-603
Number of pages21
JournalIEEE Transactions on Aerospace and Electronic Systems
Volume39
Issue number2
DOIs
StatePublished - Apr 2003

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