Passive Detection Suppression of Cyclostationary Phase Coded Waveforms

Abstract

A disadvantage of using pulse compression coded waveforms in radar is that the transmitted signal has features that can be easily detected by enemy passive detection equipment. One of these detectable features is the carrier frequency. Presence of the carrier frequency in coded waveforms gives rise to cyclostationary properties that are exhibited in the form of spectral lines in a nonlinearly transformed signal. This paper focuses on suppression of cyclostationary properties present in a transformed Welti coded cw waveform with the nonlinear transformation being that of the quadratic type.

A new algorithm of energy suppression for satellite navigation

“…Energy is mainly located in neighborhood of CA code frequency main-lobe, as Fig.3, therefore the best energy suppression filter is notch filter. The notch filter can be easily constructed and its bandwidth is easily varied as needed [10] . , in this paper.…”