Open AccessSignals with zero autocorrelation zone for the synthesised aperture radar
Author(s) -
Ipanov R.N.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.1918
Subject(s) - autocorrelation , side lobe , modulation (music) , signal (programming language) , radar , physics , keying , mathematics , autocorrelation technique , algorithm , acoustics , optics , telecommunications , computer science , statistics , antenna (radio) , programming language
For the synthesised aperture radar, the radar signal with a zero autocorrelation zone (ZACZ) is synthesised, which represents a sequence from two phase‐code shift keying (PCSK) pulses coded by adjacent pairs of the D‐code with additional linear frequency shift‐keying (LFSK) of the train pulse discrete value. A comparative analysis is performed of correlation characteristics of the synthesised signal with the signal without discrete modulation and the truncated M‐sequence. Total correlation characteristics of the ensemble from four signals are also analysed. It is shown that in ZACZ, the level of all side lobes of the autocorrelation function (ACF) of the synthesised signal is less than the level of the ACF side lobes of the M‐sequence. The total ACF of the ensemble of four signals both with modulation and without the discrete modulation has zero side lobes along with the whole time axis τ , and at mismatch in frequency in ZACZ, it has the side lobe level <−40 dB.