Comparison of complementary sequences in hybrid phase and frequency shift keying CW radar using periodic ambiguity analysis
Castaneda, Francisco Jose
Pace, Phillip E.
MetadataShow full item record
Continuous waveform (CW) polyphase sequences for radar have a much lower power spectral density (PSD) than pulsed signals but can retain the same target detection capability. The use of different phase values or subcodes to modulate the carrier provides a low probability of intercept (LPI) radar waveform which cannot be seen by a non-cooperative intercept receiver (NCIR). Also, it is a low probability of detection (LPD) waveform due to the low PSD. Frequency shift keying (FSK) radar has a higher PSD but is moved about quickly in frequency over a large bandwidth in which the NCIR cannot follow. Consequently, the FSK (usually a Costas frequency set) remains a LPI signal but not a LPD. To combine the advantages of each waveform, this thesis presents a hybrid FSK/PSK emitter waveform to further the LPI, LPD characteristics. By combining both techniques (PSK/FSK), a high time-bandwidth waveform is constructed that provides better LPI/LPD characteristics than each waveform. The periodic ambiguity function (PAF) is evaluated for three different complementary sequences to modulate a Costas frequency set. The peak time and Doppler sidelobes of the PAF are compared against the P4 polyphase modulation for the Golay complementary sequence (15 dB improvement), the quaternary periodic complementary sequence (16 dB improvement), and the quaternary Golay complementary sequence (18 dB improvement).
Showing items related by title, author, creator and subject.
Performance analysis of a Link-16 compatible waveform using errors-and-erasures decoding when corrupted by pulse-noise interference Lekkakos, Dimitrios; Kragh, Frank; Robertson, Clark (IEEE, 2009);The Link-16 is the tactical data link utilized by the Joint Tactical Information Distribution System (JTIDS). The JTIDS system is important due to its wide use by U.S. armed forces, NATO, and other allied militaries. Link-16 ...
Code shift keying based joint radar and communications for EMCON applications Tedesso, Thomas W.; Romero, Ric (Elsevier Ltd., 2018-05);Due to the explosion in the demand for broadband wireless services by consumers, wireless network service providers require increased frequency allocations from an already crowded frequency spectrum. In an effort to ...
A theoretical study of complementary binary code sequences and a computer search for new kernels. Jauregui, Stephen Jr. (Monterey, California: U.S. Naval Postgraduate School, 1962-05);Complementary binary sequences were invented by Golay in an investigation of infra-red multi-slit spectrometry. This dissertation formalizes the basic results obtained by Golay and develops new concepts and techniques ...