Range and Doppler Ambiguity Elimination in Coherent Radar using Quasicontinuous Signals
N.E. Bystrov†, I.N. Zhukova‡, V.M. Reganov§, S.D. Chebotarev††
‡ Head of Radiosystems Department, Novgorod State University, Velikiy Novgorod, Russian Federation
§ Head of R&D Department, Novgorod State University, Velikiy Novgorod, Russian Federation
††Research officer Department Radiosystems, Novgorod State University, Velikiy Novgorod, Russian Federation
ABSTRACT: Modern radars use pulse signals with a various repetition rate. The main drawback of repetitive signals is the range and Doppler ambiguities, caused by multiple peaks in an ambiguity function. Well-known methods of ambiguity elimination suggest either multistep processing procedures, or the partial elimination of this drawback. This paper analyzes a new approach of range and Doppler ambiguities elimination in pulse Doppler radars using amplitude-phase coded signals with a pseudorandom pulse repetition interval and duration for a long duration coherent processing interval (quasicontinuous signals). Signals described here have the thumbtack ambiguity function with single peak. They eliminate the range and Doppler ambiguities and make it possible to use one antenna for simultaneous probing and reception, with a low peak-to-average power ratio. The method of synthesis, the receive window ratio and the ambiguity function are shown. Energy characteristics are described.
Keywords : Pulse Doppler radar; Range ambiguity; Doppler ambiguity; Radar systems; Pulse modulation; Phase shift keying; Radar waveforms; Velocity measurement; Distance measurement.
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