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In this paper, a new code is constructed by concatenating a Golay complementary code pair (A, B) with a gap in between. The autocorrelation of this code contains a zero-sidelobe region on either side of the mainlobe and an adjacent region of small cross-correlation sidelobes. This is achieved by using a polyphase code pair as chips for A and B that satisfy two conditions: they have conjugate symmetry/anti-symmetry...
This paper proposes a blind phase coded signal interception method for a potential target to recognize whether it is being looked at. The interception method is based on identifying the carrier frequency (fc) of the received signal with unknown phase coding from the ratio of the second derivative of the signal with itself. It is shown that this ratio is equal to −(2πfc)2. The second derivative is...
This paper proposes a Doppler detection method for Linear FM (LFM) waveform by identifying its location within the extended Matched Filter (MF). The extended MF of a LFM waveform is constructed by extending its frequency sweep on both sides. Doppler shift results in shifting the frequency sweep of the LFM waveform along the instantaneous frequency of its extended MF. Thus, identifying the location...
Golay complementary code pairs have the advantage of being biphase, available at a variety of lengths as long as desired, with complete sidelobe cancellation. But, they have the disadvantage of requiring two frequencies/channels with the possibility of inexact sidelobe cancellation due to frequency selective fading. In this paper, the complementary code pair are transmitted at the same frequency band,...
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